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Eaton Vance Senior Income Trust

Regulatory Filings • Feb 25, 2022

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N-CSRS 1 d249864dncsrs.htm EATON VANCE SENIOR INCOME TRUST Eaton Vance Senior Income Trust

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form N-CSR

CERTIFIED SHAREHOLDER REPORT OF REGISTERED

MANAGEMENT INVESTMENT COMPANIES

Investment Company Act File Number: 811-09013

Eaton Vance Senior Income Trust

(Exact Name of Registrant as Specified in Charter)

Two International Place, Boston, Massachusetts 02110

(Address of Principal Executive Offices)

Deidre E. Walsh

Two International Place, Boston, Massachusetts 02110

(Name and Address of Agent for Services)

(617) 482-8260

(Registrant’s Telephone Number)

June 30

Date of Fiscal Year End

December 31, 2021

Date of Reporting Period

Item 1. Reports to Stockholders

Eaton Vance

Senior Income Trust (EVF)

Semiannual Report

December 31, 2021

Commodity Futures Trading Commission Registration. The Commodity Futures Trading Commission (“CFTC”) has adopted regulations that subject registered investment companies and advisers to regulation by the CFTC if a fund invests more than a prescribed level of its assets in certain CFTC-regulated instruments (including futures, certain options and swap agreements) or markets itself as providing investment exposure to such instruments. The investment adviser has claimed an exclusion from the definition of “commodity pool operator” under the Commodity Exchange Act with respect to its management of the Fund. Accordingly, neither the Fund nor the adviser with respect to the operation of the Fund is subject to CFTC regulation. Because of its management of other strategies, the Fund’s adviser is registered with the CFTC as a commodity pool operator. The adviser is also registered as a commodity trading advisor.

Fund shares are not insured by the FDIC and are not deposits or other obligations of, or guaranteed by, any depository institution. Shares are subject to investment risks, including possible loss of principal invested.

Semiannual Report December 31, 2021

Eaton Vance

Senior Income Trust

Table of Contents
Performance 2
Fund Profile 3
Endnotes and Additional Disclosures 4
Financial Statements 5
Annual Meeting of Shareholders 32
Officers and Trustees 33
Privacy Notice 34
Important Notices 36

Eaton Vance

Senior Income Trust

December 31, 2021

Performance 1,2

Portfolio Manager(s) John Redding, Andrew N. Sveen, CFA, Catherine C. McDermott, William E. Holt, CFA and Daniel P. McElaney, CFA

% Average Annual Total Returns — Fund at NAV 10/30/1998 2.99 % 7.96 % 5.73 % 6.41 %
Fund at Market Price — 1.93 11.76 6.41 6.76
S&P/LSTA Leveraged Loan Index — 1.86 % 5.20 % 4.27 % 4.69 %
% Premium/Discount to NAV 3
–2.46 %
Distributions 4
Total Distributions per share for the period $ 0.192
Distribution Rate at NAV 5.73 %
Distribution Rate at Market Price 5.88
% Total Leverage 5
Auction Preferred Shares (APS) 20.46 %
Borrowings 13.60

See Endnotes and Additional Disclosures in this report.

Past performance is no guarantee of future results. Returns are historical and are calculated net of management fees and other expenses by determining the percentage change in net asset value (NAV) or market price (as applicable) with all distributions reinvested in accordance with the Fund’s Dividend Reinvestment Plan. Performance at market price will differ from performance at NAV due to variations in the Fund’s market price versus NAV, which may reflect factors such as fluctuations in supply and demand for Fund shares, changes in Fund distributions, shifting market expectations for the Fund’s future returns and distribution rates, and other considerations affecting the trading prices of closed-end funds. Investment return and principal value will fluctuate so that shares, when sold, may be worth more or less than their original cost. Performance for periods less than or equal to one year is cumulative. Performance is for the stated time period only; due to market volatility, current Fund performance may be lower or higher than the quoted return. For performance as of the most recent month-end, please refer to eatonvance.com.

2

Eaton Vance

Senior Income Trust

December 31, 2021

Fund Profile

Top 10 Issuers (% of total investments) 6

CITGO Petroleum Corporation 1.8
Delek US Holdings, Inc. 1.5
Magenta Buyer, LLC 1.4
Tibco Software, Inc. 1.2
Intelsat Jackson Holdings S.A. 1.2
Spin Holdco, Inc. 1.1
Mallinckrodt International Finance S.A. 1.1
Banff Merger Sub, Inc. 1.0
Virgin Media SFA Finance Limited 1.0
Hyland Software, Inc. 1.0
Total 12.3 %

Credit Quality (% of bonds, loans and asset-backed securities) 7

Top 10 Sectors (% of total investments) 6

Electronics/Electrical 20.1
Business Equipment and Services 9.9
Health Care 8.0
Chemicals and Plastics 4.8
Oil and Gas 4.8
Leisure Goods/Activities/Movies 4.1
Industrial Equipment 3.3
Building and Development 2.8
Automotive 2.7
Drugs 2.6
Total 63.1 %

See Endnotes and Additional Disclosures in this report.

3

Eaton Vance

Senior Income Trust

December 31, 2021

Endnotes and Additional Disclosures

1 S&P/LSTA Leveraged Loan Index is an unmanaged index of the institutional leveraged loan market. S&P/LSTA Leveraged Loan indices are a product of S&P Dow Jones Indices LLC (“S&P DJI”) and have been licensed for use. S&P ® is a registered trademark of S&P DJI; Dow Jones ® is a registered trademark of Dow Jones Trademark Holdings LLC (“Dow Jones”); LSTA is a trademark of Loan Syndications and Trading Association, Inc. S&P DJI, Dow Jones, their respective affiliates and their third party licensors do not sponsor, endorse, sell or promote the Fund, will not have any liability with respect thereto and do not have any liability for any errors, omissions, or interruptions of the S&P Dow Jones Indices. Unless otherwise stated, index returns do not reflect the effect of any applicable sales charges, commissions, expenses, taxes or leverage, as applicable. It is not possible to invest directly in an index.

2 Performance results reflect the effects of leverage. Included in the average annual total return at NAV for the five- and ten-year periods is the impact of the 2017 and 2019 tender and repurchase of a portion of the Fund’s APS at 95% and 92% of the Fund’s APS per share liquidation preference, respectively. Had these transactions not occurred, the total return at NAV would be lower for the Fund.

Included in the average annual total return at NAV for all time periods is the impact of the 2021 tender offer by the Fund for a portion of its common shares at 99% of the Fund’s NAV. Had this tender offer not occurred, the total return at NAV would be lower for the Fund. See Note 6 to the Financial Statements for additional details.

3 The shares of the Fund often trade at a discount or premium to their net asset value. The discount or premium may vary over time and may be higher or lower than what is quoted in this report. For up-to-date premium/discount information, please refer to https://funds.eatonvance.com/closed-end-fund-prices.php.

4 The Distribution Rate is based on the Fund’s last regular distribution per share in the period (annualized) divided by the Fund’s NAV or market price at the end of the period. The Fund’s distributions may be comprised of amounts characterized for federal income tax purposes as qualified and non-qualified ordinary dividends, capital gains and nondividend distributions, also known as return of capital. As of 12/31/2021, distributions included estimates of return of capital. For additional information about nondividend distributions, please refer to Eaton Vance Closed-End Fund Distribution Notices (19a) posted on our website, eatonvance.com. The Fund will determine the federal income tax character of distributions paid to a shareholder after the end of the calendar year. This is reported on the IRS form 1099-DIV and provided to the shareholder shortly after each year-end. For information about the tax character of distributions made in prior calendar years, please refer to Performance-Tax Character of Distributions on the Fund’s webpage available at eatonvance.com. The Fund’s distributions are determined by the investment adviser based on its current assessment of the Fund’s long-term return potential. Fund distributions may be affected by numerous factors including changes in Fund performance, the cost of financing for leverage, portfolio holdings, realized and projected returns, and other factors. As portfolio and market conditions change, the rate of distributions paid by the Fund could change.

5 Leverage represents the liquidation value of the Fund’s APS and borrowings outstanding as a percentage of Fund net assets applicable to common shares plus APS and borrowings outstanding. Use of leverage creates an opportunity for income, but creates risks including greater price volatility. The cost of leverage rises and falls with changes in short-term interest rates. The Fund may be required to maintain prescribed asset coverage for its leverage and may be required to reduce its leverage at an inopportune time.

6 Excludes asset-backed securities, cash and cash equivalents.

7 Credit ratings are categorized using S&P Global Ratings (“S&P”). Ratings, which are subject to change, apply to the creditworthiness of the issuers of the underlying securities and not to the Fund or its shares. Credit ratings measure the quality of a bond based on the issuer’s creditworthiness, with ratings ranging from AAA, being the highest, to D, being the lowest based on S&P’s measures. Ratings of BBB or higher by S&P are considered to be investment-grade quality. Credit ratings are based largely on the ratings agency’s analysis at the time of rating. The rating assigned to any particular security is not necessarily a reflection of the issuer’s current financial condition and does not necessarily reflect its assessment of the volatility of a security’s market value or of the liquidity of an investment in the security. Holdings designated as “Not Rated” (if any) are not rated by S&P.

Fund profile subject to change due to active management.

4

Eaton Vance

Senior Income Trust

December 31, 2021

Portfolio of Investments (Unaudited)

Asset-Backed Securities — 11.1% — Security Principal Amount (000’s omitted) Value
Allegany Park CLO, Ltd., Series 2019-1A, Class E, 6.907%, (3 mo. USD LIBOR + 6.78%), 1/20/33 (1)(2) $ 450 $ 450,181
Ares XXXIIR CLO, Ltd., Series 2014-32RA, Class D, 6.006%, (3 mo. USD LIBOR + 5.85%), 5/15/30 (1)(2) 1,000 972,090
Ares XXXIV CLO, Ltd., Series 2015-2A, Class ER, 6.972%, (3 mo. USD LIBOR + 6.85%), 4/17/33 (1)(2) 550 543,027
Benefit Street Partners CLO XIX, Ltd., Series 2019-19A, Class E, 7.144%, (3 mo. USD LIBOR + 7.02%),
1/15/33 (1)(2) 750 741,508
Benefit Street Partners CLO XVIII, Ltd., Series 2019-18A, Class ER, 6.869%, (3 mo. USD LIBOR + 6.75%),
10/15/34 (1)(2) 500 497,625
BlueMountain CLO XXVI, Ltd., Series 2019-26A, Class ER, 7.255%, (3 mo. USD LIBOR + 7.13%), 10/20/34 (1)(2) 1,000 990,157
Canyon Capital CLO, Ltd., Series 2019-2A, Class ER, 6.874%, (3 mo. USD LIBOR + 6.75%), 10/15/34 (1)(2) 400 398,951
Carlyle Global Market Strategies CLO, Ltd.:
Series 2012-3A, Class DR2, 6.627%, (3 mo. USD LIBOR + 6.50%), 1/14/32 (1)(2) 600 562,826
Series 2015-5A, Class DR, 6.832%, (3 mo. USD LIBOR + 6.70%), 1/20/32 (1)(2) 500 473,284
Cedar Funding X CLO, Ltd., Series 2019-10A, Class ER, 6.632%, (3 mo. USD LIBOR + 6.50%), 10/20/32 (1)(2) 500 494,574
Galaxy XV CLO, Ltd., Series 2013-15A, Class ER, 6.769%, (3 mo. USD LIBOR + 6.65%), 10/15/30 (1)(2) 500 487,175
Galaxy XXI CLO, Ltd., Series 2015-21A, Class ER, 5.382%, (3 mo. USD LIBOR + 5.25%), 4/20/31 (1)(2) 500 475,334
Golub Capital Partners CLO 23M, Ltd., Series 2015-23A, Class ER, 5.882%, (3 mo. USD LIBOR + 5.75%),
1/20/31 (1)(2) 600 540,572
Madison Park Funding XXXVI, Ltd., Series 2019-36A, Class E, 7.374%, (3 mo. USD LIBOR + 7.25%), 1/15/33 (1)(2) 250 250,018
Neuberger Berman Loan Advisers CLO 31, Ltd., Series 2019-31A, Class ER, 6.632%, (3 mo. USD LIBOR + 6.50%),
4/20/31 (1)(2) 500 500,406
Palmer Square CLO, Ltd.:
Series 2013-2A, Class DRR, 5.972%, (3 mo. USD LIBOR + 5.85%), 10/17/31 (1)(2) 450 439,222
Series 2019-1A, Class DR, 6.709%, (3 mo. USD LIBOR + 6.50%), 11/14/34 (1)(2) 500 497,324
RAD CLO 5, Ltd., Series 2019-5A, Class E, 6.824%, (3 mo. USD LIBOR + 6.70%), 7/24/32 (1)(2) 500 500,000
RAD CLO 7, Ltd., Series 2020-7A, Class E, 6.622%, (3 mo. USD LIBOR + 6.50%), 4/17/33 (1)(2) 575 575,296
Security Principal Amount (000’s omitted) Value
Regatta XIV Funding, Ltd., Series 2018-3A, Class E, 6.074%, (3 mo. USD LIBOR + 5.95%), 10/25/31 (1)(2) $ 300 $ 285,878
Regatta XVI Funding, Ltd., Series 2019-2A, Class E, 7.124%, (3 mo. USD LIBOR + 7.00%), 1/15/33 (1)(2) 500 500,222
Vibrant CLO X, Ltd., Series 2018-10A, Class D, 6.322%, (3 mo. USD LIBOR + 6.19%), 10/20/31 (1)(2) 375 344,442
Vibrant CLO XI, Ltd., Series 2019-11A, Class D, 6.902%, (3 mo. USD LIBOR + 6.77%), 7/20/32 (1)(2) 500 478,163
Voya CLO, Ltd., Series 2013-1A, Class DR, 6.604%, (3 mo. USD LIBOR + 6.48%), 10/15/30 (1)(2) 1,000 919,091
Wellfleet CLO, Ltd., Series 2020-1A, Class D, 7.364%, (3 mo. USD
LIBOR + 7.24%), 4/15/33 (1)(2) 550 550,306
Total Asset-Backed
Securities (identified cost $13,704,903) $ 13,467,672
Closed-End Funds — 3.2%
Security Shares Value
BlackRock Floating Rate Income Strategies Fund, Inc. 49,400 $ 663,442
Invesco Senior Income Trust 178,510 772,948
Nuveen Credit Strategies Income Fund 180,539 1,171,698
Nuveen Floating Rate Income Fund 73,198 744,424
Nuveen Floating Rate Income Opportunity Fund 51,054 517,177
Total Closed-End
Funds (identified cost $4,361,230) $ 3,869,689
Common Stocks — 2.2%
Security Shares Value
Aerospace and Defense — 0.1%
IAP Global Services, LLC (3)(4)(5) 29 $ 141,940
$ 141,940
Electronics / Electrical — 0.2%
Riverbed Technology, Inc. (4)(5) 85 $ 1,311
Skillsoft
Corp. (4)(5) 25,137 230,007
$ 231,318
Oil and Gas — 0.8%
Nine Point Energy Holdings, Inc. (3)(5)(7) 325 $ 0
QuarterNorth Energy, Inc. (4)(5) 10,396 987,620
$ 987,620

5 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2021

Portfolio of Investments (Unaudited) — continued

Security Shares Value
Radio and Television — 0.6%
Clear Channel Outdoor Holdings, Inc. (4)(5) 42,539 $ 140,804
Cumulus Media, Inc., Class A (4)(5) 18,865 212,231
iHeartMedia, Inc., Class A (4)(5) 18,090 380,614
$ 733,649
Retailers (Except Food and Drug) — 0.1%
Phillips Pet Holding Corp. (3)(4)(5) 269 $ 104,625
$ 104,625
Telecommunications — 0.4%
GEE Acquisition Holdings Corp. (3)(4)(5) 21,114 $ 456,696
$ 456,696
Total Common
Stocks (identified cost $2,323,582) $ 2,655,848
Convertible Preferred Stocks — 0.0% (6)
Security Shares Value
Electronics / Electrical — 0.0% (6)
Riverbed Technology, Inc., Series A, 6.50%, (1.50% cash,
5.00% PIK) (4)(5) 28 $ 622
$ 622
Oil and Gas — 0.0%
Nine Point Energy Holdings, Inc., Series A, 12.00% (PIK) (3)(5)(7) 5 $ 0
$ 0
Total Convertible Preferred
Stocks (identified cost $5,829) $ 622
Corporate Bonds — 2.1%
Security Principal Amount (000’s omitted) Value
Business Equipment and Services — 0.6%
Prime Security Services Borrower, LLC/Prime Finance, Inc.:
5.25%, 4/15/24 (1) $ 325 $ 346,183
5.75%,
4/15/26 (1) 325 349,320
$ 695,503
Food Products — 0.5%
Del Monte Foods, Inc., 11.875%, 5/15/25 (1) $ 500 $ 557,722
$ 557,722
Security Value
Radio and Television — 0.8%
Diamond Sports Group, LLC/Diamond Sports Finance Co., 5.375%, 8/15/26 (1) $ 1,407 $ 705,212
iHeartCommunications, Inc.:
6.375%, 5/1/26 102 106,255
8.375%, 5/1/27 185 195,741
$ 1,007,208
Telecommunications — 0.2%
Digicel International Finance, Ltd./Digicel International
Holdings, Ltd., 8.75%, 5/25/24 (1) $ 275 $ 282,508
$ 282,508
Total Corporate
Bonds (identified cost $2,890,296) $ 2,542,941
Senior Floating-Rate Loans — 131.9% (8)
Borrower/Description Principal Amount* (000’s omitted) Value
Aerospace and Defense — 2.2%
Aernnova Aerospace S.A.U.:
Term Loan, 3.00%, (3 mo. EURIBOR + 3.00%), 2/22/27 EUR 179 $ 192,020
Term Loan, 3.00%, (3 mo. EURIBOR + 3.00%), 2/26/27 EUR 696 748,879
IAP Worldwide Services, Inc.:
Revolving Loan, 0.75%, 7/18/23 (9) 161 161,176
Term Loan - Second Lien, 8.00%, (3 mo. USD LIBOR + 6.50%, Floor 1.50%), 7/18/23 (3) 206 167,276
Spirit Aerosystems, Inc., Term Loan, 4.25%, (1 mo. USD LIBOR + 3.75%, Floor 0.50%), 1/15/25 248 248,576
WP CPP Holdings, LLC, Term Loan, 4.75%, (3 mo. USD LIBOR + 3.75%,
Floor 1.00%), 4/30/25 1,179 1,133,090
$ 2,651,017
Air Transport — 3.0%
AAdvantage Loyalty IP, Ltd., Term Loan, 5.50%, (3 mo. USD LIBOR + 4.75%, Floor 0.75%), 4/20/28 925 $ 960,266
Air Canada, Term Loan, 4.25%, (6 mo. USD LIBOR + 3.50%, Floor 0.75%), 8/11/28 600 600,500
Brown Group Holding, LLC, Term Loan, 3.00%, (3 mo. USD LIBOR + 2.50%, Floor 0.50%), 6/7/28 647 646,260
Mileage Plus Holdings, LLC, Term Loan, 6.25%, (3 mo. USD LIBOR + 5.25%, Floor 1.00%), 6/21/27 350 370,344

6 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2021

Portfolio of Investments (Unaudited) — continued

Borrower/Description Value
Air Transport (continued)
United Airlines, Inc., Term Loan, 4.50%, (3 mo. USD LIBOR + 3.75%,
Floor 0.75%), 4/21/28 995 $ 1,000,515
$ 3,577,885
Automotive — 4.2%
Autokiniton US Holdings, Inc., Term Loan, 5.00%, (12 mo. USD LIBOR + 4.50%, Floor 0.50%), 4/6/28 746 $ 748,675
Bright Bidco B.V., Term Loan, 4.50%, (6 mo. USD LIBOR + 3.50%, Floor 1.00%), 6/30/24 717 554,557
Chassix, Inc., Term Loan, 6.50%, (USD LIBOR + 5.50%, Floor 1.00%), 11/15/23 (10) 624 561,600
Clarios Global, L.P., Term Loan, 3.354%, (1 mo. USD LIBOR + 3.25%), 4/30/26 930 926,009
Dayco Products, LLC, Term Loan, 4.425%, (3 mo. USD LIBOR + 4.25%), 5/19/23 478 470,338
Garrett LX I S.a.r.l., Term Loan, 3.75%, (3 mo. USD LIBOR + 3.25%, Floor 0.50%), 4/30/28 349 348,252
Gates Global, LLC, Term Loan, 3.25%, (1 mo. USD LIBOR + 2.50%, Floor 0.75%), 3/31/27 771 770,479
MajorDrive Holdings IV, LLC, Term Loan, 4.50%, (3 mo. USD LIBOR + 4.00%, Floor 0.50%), 5/12/28 323 323,779
Wheel Pros, LLC, Term Loan, 5.25%, (1 mo. USD LIBOR + 4.50%, Floor
0.75%), 5/11/28 449 448,630
$ 5,152,319
Beverage and Tobacco — 1.3%
Arterra Wines Canada, Inc., Term Loan, 4.25%, (3 mo. USD LIBOR + 3.50%, Floor 0.75%), 11/24/27 495 $ 496,315
City Brewing Company, LLC, Term Loan, 4.25%, (3 mo. USD LIBOR + 3.50%, Floor 0.75%), 4/5/28 399 379,299
Triton Water Holdings, Inc., Term Loan, 4.00%, (3 mo. USD LIBOR +
3.50%, Floor 0.50%), 3/31/28 746 739,021
$ 1,614,635
Brokerage / Securities Dealers / Investment Houses — 0.4%
Hudson River Trading, LLC, Term Loan, 3.104%, (1 mo. USD LIBOR +
3.00%), 3/20/28 473 $ 469,961
$ 469,961
Building and Development — 4.4%
American Residential Services, LLC, Term Loan, 4.25%, (3 mo. USD LIBOR + 3.50%, Floor 0.75%),
10/15/27 272 $ 272,590
Cornerstone Building Brands, Inc., Term Loan, 3.75%, (1 mo. USD LIBOR + 3.25%, Floor 0.50%),
4/12/28 921 921,247
CP Atlas Buyer, Inc., Term Loan, 4.25%, (3 mo. USD LIBOR + 3.75%, Floor 0.50%), 11/23/27 571 568,799
Borrower/Description Value
Building and Development (continued)
MI Windows and Doors, LLC, Term Loan, 4.50%, (1 mo. USD LIBOR + 3.75%, Floor 0.75%), 12/18/27 223 $ 223,892
Northstar Group Services, Inc., Term Loan, 6.50%, (1 mo. USD LIBOR + 5.50%, Floor 1.00%),
11/12/26 609 611,419
Park River Holdings, Inc., Term Loan, 4.00%, (3 mo. USD LIBOR + 3.25%, Floor 0.75%), 12/28/27 323 320,814
Patagonia Bidco Limited:
Term Loan, 4.831%, (SONIA + 4.75%), 3/5/29 GBP 317 426,807
Term Loan, 3/5/29 (11) GBP 58 77,601
Quikrete Holdings, Inc., Term Loan,
6/11/28 (11) 1,000 998,177
Standard Industries, Inc., Term Loan, 3.00%, (3 mo. USD LIBOR + 2.50%, Floor 0.50%), 9/22/28 288 288,553
Werner FinCo L.P., Term Loan, 5.00%, (3 mo. USD LIBOR + 4.00%, Floor 1.00%), 7/24/24 527 528,467
WireCo WorldGroup, Inc., Term Loan, 4.75%, (6 mo. USD LIBOR +
4.25%, Floor 0.50%), 10/27/28 125 124,844
$ 5,363,210
Business Equipment and Services — 15.0%
AlixPartners, LLP, Term Loan, 3.25%, (3 mo. EURIBOR + 3.25%), 2/4/28 EUR 248 $ 282,102
AppLovin Corporation:
Term Loan, 3.354%, (1 mo. USD LIBOR + 3.25%), 8/15/25 647 645,320
Term Loan, 3.50%, (1 mo. USD LIBOR + 3.00%, Floor 0.50%), 10/25/28 374 374,343
Belfor Holdings, Inc., Term Loan, 3.854%, (1 mo. USD LIBOR + 3.75%), 4/6/26 244 244,359
Blitz 20-487 GmbH, Term Loan, 3.50%, (3 mo. EURIBOR + 3.50%), 4/28/28 EUR 375 426,003
Bracket Intermediate Holding Corp., Term Loan, 4.377%, (3 mo. USD LIBOR + 4.25%), 9/5/25 411 410,776
Brand Energy & Infrastructure Services, Inc., Term Loan, 5.25%, (3 mo. USD LIBOR + 4.25%, Floor
1.00%), 6/21/24 1,712 1,679,051
Camelot U.S. Acquisition 1 Co., Term Loan, 4.00%, (1 mo. USD LIBOR + 3.00%, Floor 1.00%),
10/30/26 545 544,364
Employbridge, LLC, Term Loan, 5.50%, (3 mo. USD LIBOR + 4.75%, Floor 0.75%), 7/14/28 449 445,579
Garda World Security Corporation, Term Loan, 4.36%, (1 mo. USD LIBOR + 4.25%), 10/30/26 1,495 1,494,889
Grab Holdings, Inc., Term Loan, 5.50%, (3 mo. USD LIBOR + 4.50%, Floor 1.00%), 1/29/26 1,141 1,146,369
Greeneden U.S. Holdings II, LLC, Term Loan, 4.75%, (1 mo. USD LIBOR + 4.00%, Floor 0.75%),
12/1/27 721 724,514
Hillman Group, Inc. (The):
Term Loan, 2.785%, (1 mo. USD LIBOR + 2.75%, Floor 0.50%), 7/14/28 (9) 38 37,523
Term Loan, 3.25%, (1 mo. USD LIBOR + 2.75%, Floor 0.50%), 7/14/28 159 158,301

7 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2021

Portfolio of Investments (Unaudited) — continued

Borrower/Description Value
Business Equipment and Services (continued)
Indy US Bidco, LLC:
Term Loan, 3.854%, (1 mo. USD LIBOR + 3.75%), 3/5/28 347 $ 347,958
Term Loan, 3.75%, (1 mo. EURIBOR + 3.75%), 3/6/28 EUR 199 226,136
Intrado Corporation, Term Loan, 5.00%, (3 mo. USD LIBOR + 4.00%, Floor 1.00%), 10/10/24 452 429,979
IRI Holdings, Inc., Term Loan, 4.354%, (1 mo. USD LIBOR + 4.25%), 12/1/25 771 770,785
Ivanti Software, Inc.:
Term Loan, 4.75%, (3 mo. USD LIBOR + 4.00%, Floor 0.75%), 12/1/27 347 345,964
Term Loan, 5.00%, (3 mo. USD LIBOR + 4.25%, Floor 0.75%), 12/1/27 1,318 1,323,045
KUEHG Corp., Term Loan - Second Lien, 9.25%, (3 mo. USD LIBOR + 8.25%, Floor 1.00%), 8/22/25 200 199,333
LGC Group Holdings, Ltd., Term Loan, 3.00%, (1 mo. EURIBOR + 3.00%), 4/21/27 EUR 225 251,239
Loire Finco Luxembourg S.a.r.l., Term Loan, 3.354%, (1 mo. USD LIBOR + 3.25%), 4/21/27 148 145,640
MedAssets Software Intermediate Holdings, Inc., Term Loan, 4.50%, (6 mo. USD LIBOR + 4.00%, Floor 0.50%),
11/17/28 250 250,156
Monitronics International, Inc., Term Loan, 7.75%, (3 mo. USD LIBOR + 6.50%, Floor 1.25%),
3/29/24 357 335,411
NAB Holdings, LLC, Term Loan, 3.50%, (SOFR + 3.00%, Floor 0.50%), 11/23/28 200 199,375
Pike Corporation, Term Loan, 3.11%, (1 mo. USD LIBOR + 3.00%), 1/21/28 240 239,227
SITEL Worldwide Corporation, Term Loan, 4.25%, (3 mo. USD LIBOR + 3.75%, Floor 0.50%), 8/28/28 399 399,392
Skopima Merger Sub, Inc., Term Loan, 4.50%, (1 mo. USD LIBOR + 4.00%, Floor 0.50%), 5/12/28 524 521,116
SMG US Midco 2, Inc., Term Loan, 2.622%, (USD LIBOR + 2.50%), 1/23/25 (10) 120 117,272
Sotheby’s, Term Loan, 5.00%, (3 mo. USD LIBOR + 4.50%, Floor 0.50%), 1/15/27 206 206,649
Spin Holdco, Inc., Term Loan, 4.75%, (3 mo. USD LIBOR + 4.00%, Floor 0.75%), 3/4/28 2,035 2,043,386
TK Elevator Topco GmbH, Term Loan,
7/29/27 (11) EUR 150 170,317
TPG VIII Elf Purchaser, LLC, Term Loan, 4.00%, (3 mo. USD LIBOR + 3.50%, Floor 0.50%), 11/6/28 100 100,163
Trans Union, LLC, Term Loan, 2.75%, (1 mo. USD LIBOR + 2.25%, Floor 0.50%), 12/1/28 525 524,380
Zephyr Bidco Limited, Term Loan, 4.928%, (1 mo. GBP LIBOR +
4.75%), 7/23/25 GBP 350 469,893
$ 18,230,309
Borrower/Description Value
Cable and Satellite Television — 2.8%
Altice France S.A.:
Term Loan, 3.811%, (3 mo. USD LIBOR + 3.69%), 1/31/26 339 $ 336,169
Term Loan, 4.118%, (2 mo. USD LIBOR + 4.00%), 8/14/26 997 994,105
Numericable Group S.A., Term Loan, 3.00%, (3 mo. EURIBOR + 3.00%), 7/31/25 EUR 215 240,031
Virgin Media Bristol, LLC, Term Loan, 3.36%, (1 mo. USD LIBOR +
3.25%), 1/31/29 1,825 1,826,141
$ 3,396,446
Chemicals and Plastics — 7.5%
Aruba Investments, Inc.:
Term Loan, 4.00%, (6 mo. EURIBOR + 4.00%), 11/24/27 EUR 248 $ 282,843
Term Loan, 4.75%, (6 mo. USD LIBOR + 4.00%, Floor 0.75%), 11/24/27 347 348,248
Atotech B.V., Term Loan, 2.50%, (3 mo. EURIBOR + 2.50%), 3/18/28 EUR 150 170,828
Charter NEX US, Inc., Term Loan, 4.50%, (1 mo. USD LIBOR + 3.75%, Floor 0.75%), 12/1/27 223 223,585
Chemours Company (The), Term Loan, 2.50%, (3 mo. EURIBOR + 2.00%, Floor 0.50%), 4/3/25 EUR 279 314,606
CPC Acquisition Corp., Term Loan, 4.50%, (3 mo. USD LIBOR + 3.75%, Floor 0.75%), 12/29/27 372 369,396
Ferro Corporation:
Term Loan, 2.47%, (3 mo. USD LIBOR + 2.25%), 2/14/24 50 49,791
Term Loan, 2.47%, (3 mo. USD LIBOR + 2.25%), 2/14/24 51 50,874
Term Loan, 2.47%, (3 mo. USD LIBOR + 2.25%), 2/14/24 61 61,328
Gemini HDPE, LLC, Term Loan, 3.50%, (3 mo. USD LIBOR + 3.00%, Floor 0.50%), 12/31/27 363 362,972
Groupe Solmax, Inc., Term Loan, 5.50%, (3 mo. USD LIBOR + 4.75%, Floor 0.75%), 5/29/28 448 448,590
Hexion, Inc., Term Loan, 3.64%, (3 mo. USD LIBOR + 3.50%), 7/1/26 341 341,890
Illuminate Buyer, LLC, Term Loan, 3.604%, (1 mo. USD LIBOR + 3.50%), 6/30/27 353 351,706
INEOS Enterprises Holdings US Finco, LLC, Term Loan, 4.50%, (3 mo. USD LIBOR + 3.50%, Floor 1.00%),
8/28/26 100 100,814
INEOS Finance PLC, Term Loan, 3.25%, (3 mo. EURIBOR + 2.75%, Floor 0.50%), 11/4/28 EUR 175 199,237
INEOS Styrolution US Holding, LLC, Term Loan, 3.25%, (1 mo. USD LIBOR + 2.75%, Floor 0.50%),
1/29/26 995 994,378
INEOS US Finance, LLC, Term Loan,
11/8/28 (11) 150 149,344

8 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2021

Portfolio of Investments (Unaudited) — continued

Borrower/Description Value
Chemicals and Plastics (continued)
Kraton Polymers, LLC, Term Loan,
11/18/28 (11) 125 $ 125,234
Lonza Group AG, Term Loan, 4.75%, (6 mo. USD LIBOR + 4.00%, Floor 0.75%), 7/3/28 647 647,007
LSF11 Skyscraper Holdco S.a.r.l., Term Loan, 4.25%, (3 mo. USD LIBOR + 3.75%, Floor 0.50%),
9/29/27 273 273,113
Momentive Performance Materials, Inc., Term Loan, 3.36%, (1 mo. USD LIBOR + 3.25%), 5/15/24 219 219,409
Olympus Water US Holding Corporation, Term Loan,
11/9/28 (11) 700 698,493
Orion Engineered Carbons GmbH, Term Loan, 2.75%, (3 mo. USD LIBOR + 2.25%, Floor 0.50%),
9/24/28 100 100,249
PMHC II, Inc., Term Loan, 4.50%, (3 mo. USD LIBOR + 3.50%, Floor 1.00%), 3/31/25 804 800,576
Pregis TopCo Corporation, Term Loan, 4.104%, (1 mo. USD LIBOR + 4.00%), 7/31/26 294 293,357
Pretium PKG Holdings, Inc.:
Term Loan, 4.50%, (3 mo. USD LIBOR + 4.00%, Floor 0.50%), 10/2/28 150 149,893
Term Loan - Second Lien, 7.25%, (3 mo. USD LIBOR + 6.75%, Floor 0.50%), 10/1/29 100 100,313
Rohm Holding GmbH, Term Loan, 4.904%, (6 mo. USD LIBOR + 4.75%), 7/31/26 448 448,270
Venator Materials Corporation, Term Loan, 3.104%, (1 mo. USD LIBOR + 3.00%), 8/8/24 168 166,655
W.R. Grace & Co. Conn., Term Loan, 4.25%, (3 mo. USD
LIBOR + 3.75%, Floor 0.50%), 9/22/28 300 300,900
$ 9,143,899
Conglomerates — 0.1%
Penn Engineering & Manufacturing Corp., Term Loan, 3.50%,
(3 mo. USD LIBOR + 2.50%, Floor 1.00%), 6/27/24 83 $ 83,122
$ 83,122
Containers and Glass Products — 1.3%
Berlin Packaging, LLC, Term Loan, 4.25%, (USD LIBOR + 3.75%, Floor 0.50%), 3/11/28 (10) 324 $ 323,951
Libbey Glass, Inc., Term Loan, 11.00%, (1 mo. USD LIBOR + 10.00%, Floor 1.00%), 11/13/25 354 368,489
Reynolds Group Holdings, Inc., Term Loan, 4.00%, (1 mo. USD LIBOR + 3.50%, Floor 0.50%), 9/20/28 249 249,157
TricorBraun Holdings, Inc., Term Loan, 3.75%, (1 mo. USD LIBOR + 3.25%, Floor 0.50%), 3/3/28 299 296,794
Trident TPI Holdings, Inc., Term Loan, 4.25%, (3 mo. USD LIBOR +
3.25%, Floor 1.00%), 10/17/24 361 361,067
$ 1,599,458
Borrower/Description Value
Cosmetics / Toiletries — 0.1%
Kronos Acquisition Holdings, Inc., Term Loan, 12/22/26 (11) 100 $ 99,000
$ 99,000
Drugs — 4.1%
Akorn, Inc., Term Loan, 8.50%, (3 mo. USD LIBOR + 7.50%, Floor 1.00%), 10/1/25 303 $ 307,336
Alkermes, Inc., Term Loan, 3.00%, (3 mo. USD LIBOR + 2.50%, Floor 0.50%), 3/12/26 183 180,614
Bausch Health Companies, Inc., Term Loan, 3.104%, (1 mo. USD LIBOR + 3.00%), 6/2/25 600 598,084
Cambrex Corporation, Term Loan, 4.25%, (1 mo. USD LIBOR + 3.50%, Floor 0.75%), 12/4/26 149 148,748
Curia Global, Inc., Term Loan, 4.50%, (3 mo. USD LIBOR + 3.75%, Floor 0.75%), 8/30/26 684 685,248
Jazz Financing Lux S.a.r.l., Term Loan, 4.00%, (1 mo. USD LIBOR + 3.50%, Floor 0.50%), 5/5/28 746 750,181
Mallinckrodt International Finance S.A.:
Term Loan, 6.00%, (3 mo. USD LIBOR + 5.25%, Floor 0.75%), 9/24/24 826 775,784
Term Loan, 6.25%, (3 mo. USD LIBOR + 5.50%, Floor 0.75%), 2/24/25 1,347 1,264,512
Nidda Healthcare Holding AG, Term Loan, 3.50%, (3 mo. EURIBOR +
3.50%), 8/21/26 EUR 275 310,348
$ 5,020,855
Ecological Services and Equipment — 1.7%
EnergySolutions, LLC, Term Loan, 4.75%, (3 mo. USD LIBOR + 3.75%, Floor 1.00%), 5/9/25 1,738 $ 1,738,739
GFL Environmental, Inc., Term Loan, 3.50%, (3 mo. USD LIBOR + 3.00%, Floor 0.50%), 5/30/25 25 24,832
TruGreen Limited Partnership, Term Loan, 4.75%, (1 mo. USD LIBOR +
4.00%, Floor 0.75%), 11/2/27 297 297,882
$ 2,061,453
Electronics / Electrical — 31.5%
Allegro Microsystems, Inc., Term Loan, 4.25%, (3 mo. USD LIBOR + 3.75%, Floor 0.50%), 9/30/27 21 $ 21,154
Altar Bidco, Inc.:
Term Loan, 11/17/28 (11) 325 324,187
Term Loan - Second Lien, 11/4/29 (11) 125 125,937
AQA Acquisition Holding, Inc., Term Loan, 4.75%, (3 mo. USD LIBOR + 4.25%, Floor 0.50%), 3/3/28 423 423,205
Astra Acquisition Corp.:
Term Loan, 5.75%, (1 mo. USD LIBOR + 5.25%, Floor 0.50%), 10/25/28 450 442,500
Term Loan - Second Lien, 9.625%, (1 mo. USD LIBOR + 8.875%, Floor 0.75%), 10/22/29 425 420,750

9 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2021

Portfolio of Investments (Unaudited) — continued

Borrower/Description Value
Electronics / Electrical (continued)
Banff Merger Sub, Inc.:
Term Loan, 3.974%, (3 mo. USD LIBOR + 3.75%), 10/2/25 1,491 $ 1,487,330
Term Loan, 4.00%, (3 mo. EURIBOR + 4.00%), 10/2/25 EUR 122 138,618
Term Loan - Second Lien, 6.00%, (3 mo. USD LIBOR + 5.50%, Floor 0.50%), 2/27/26 225 227,362
Barracuda Networks, Inc., Term Loan - Second Lien, 7.50%, (3 mo. USD LIBOR + 6.75%, Floor 0.75%),
10/30/28 200 201,917
Buzz Merger Sub, Ltd.:
Term Loan, 2.851%, (1 mo. USD LIBOR + 2.75%), 1/29/27 270 269,512
Term Loan, 3.75%, (1 mo. USD LIBOR + 3.25%, Floor 0.50%), 1/29/27 27 26,806
CentralSquare Technologies, LLC, Term Loan, 3.974%, (3 mo. USD LIBOR + 3.75%), 8/29/25 1,563 1,478,201
Chamberlain Group, Inc., Term Loan, 4.00%, (1 mo. USD LIBOR + 3.50%, Floor 0.50%), 11/3/28 400 400,125
Cloudera, Inc.:
Term Loan, 4.25%, (1 mo. USD LIBOR + 3.75%, Floor 0.50%), 10/8/28 700 698,396
Term Loan - Second Lien, 6.50%, (1 mo. USD LIBOR + 6.00%, Floor 0.50%), 10/8/29 200 200,500
Cohu, Inc., Term Loan, 3.104%, (1 mo. USD LIBOR + 3.00%), 10/1/25 114 114,012
Concorde Midco, Ltd., Term Loan, 4.00%, (6 mo. EURIBOR + 4.00%), 3/1/28 EUR 250 285,811
Constant Contact, Inc., Term Loan, 4.75%, (3 mo. USD LIBOR + 4.00%, Floor 0.75%), 2/10/28 921 921,739
Cornerstone OnDemand, Inc., Term Loan, 4.25%, (6 mo. USD LIBOR + 3.75%, Floor 0.50%), 10/16/28 350 349,694
Creation Technologies, Inc., Term Loan, 6.00%, (3 mo. USD LIBOR + 5.50%, Floor 0.50%), 10/5/28 250 248,437
Delta TopCo, Inc., Term Loan - Second Lien, 8.00%, (6 mo. USD LIBOR + 7.25%, Floor 0.75%),
12/1/28 1,000 1,011,250
Digi International, Inc., Term Loan,
12/22/28 (11) 125 123,984
E2open, LLC, Term Loan, 4.00%, (3 mo. USD LIBOR + 3.50%, Floor 0.50%), 2/4/28 423 424,198
ECI Macola Max Holding, LLC, Term Loan, 4.50%, (3 mo. USD LIBOR + 3.75%, Floor 0.75%), 11/9/27 594 594,620
Electro Rent Corporation, Term Loan, 6.00%, (3 mo. USD LIBOR + 5.00%, Floor 1.00%), 1/31/24 1,489 1,491,630
Epicor Software Corporation, Term Loan - Second Lien, 8.75%, (1 mo. USD LIBOR + 7.75%, Floor 1.00%),
7/31/28 375 385,031
Hyland Software, Inc., Term Loan - Second Lien, 7.00%, (1 mo. USD LIBOR + 6.25%, Floor 0.75%),
7/7/25 1,787 1,810,064
Borrower/Description Value
Electronics / Electrical (continued)
II-VI Incorporated, Term Loan, 12/1/28 (11) 250 $ 250,052
Imperva, Inc., Term Loan, 5.00%, (3 mo. USD LIBOR + 4.00%, Floor 1.00%), 1/12/26 696 696,464
Imprivata, Inc., Term Loan, 4.00%, (3 mo. USD LIBOR + 3.50%, Floor 0.50%), 12/1/27 997 998,890
Informatica, LLC, Term Loan, 2.875%, (1 mo. USD LIBOR + 2.75%), 10/27/28 650 648,456
MA FinanceCo., LLC:
Term Loan, 2.854%, (1 mo. USD LIBOR + 2.75%), 6/21/24 67 66,852
Term Loan, 5.25%, (3 mo. USD LIBOR + 4.25%, Floor 1.00%), 6/5/25 823 837,848
Magenta Buyer, LLC:
Term Loan, 5.75%, (3 mo. USD LIBOR + 5.00%, Floor 0.75%), 7/27/28 2,070 2,068,949
Term Loan - Second Lien, 9.00%, (3 mo. USD LIBOR + 8.25%, Floor 0.75%), 7/27/29 550 548,281
Marcel LUX IV S.a.r.l., Term Loan, 4.75%, (1 mo. USD LIBOR + 4.00%, Floor 0.75%), 12/31/27 50 50,307
Mavenir Systems, Inc., Term Loan, 5.25%, (3 mo. USD LIBOR + 4.75%, Floor 0.50%), 8/18/28 100 100,292
Mediaocean, LLC, Term Loan, 4.00%, (1 mo. USD LIBOR + 3.50%, Floor 0.50%), 12/15/28 150 149,531
Mirion Technologies, Inc., Term Loan, 3.25%, (6 mo. USD LIBOR + 2.75%, Floor 0.50%), 10/20/28 175 174,523
MKS Instruments, Inc., Term Loan,
10/21/28 (11) EUR 100 113,992
Panther Commercial Holdings L.P., Term Loan, 5.00%, (3 mo. USD LIBOR + 4.50%, Floor 0.50%),
1/7/28 398 399,282
PointClickCare Technologies, Inc., Term Loan, 3.75%, (6 mo. USD LIBOR + 3.00%, Floor 0.75%),
12/29/27 298 297,936
Proofpoint, Inc., Term Loan, 3.75%, (3 mo. USD LIBOR + 3.25%, Floor 0.50%), 8/31/28 1,000 999,000
Rackspace Technology Global, Inc., Term Loan,
2/15/28 (11) 750 745,406
RealPage, Inc., Term Loan, 3.75%, (1 mo. USD LIBOR + 3.25%, Floor 0.50%), 4/24/28 1,696 1,692,970
Redstone Holdco 2 L.P., Term Loan, 5.50%, (3 mo. USD LIBOR + 4.75%, Floor 0.75%), 4/27/28 698 669,884
Renaissance Holding Corp., Term Loan - Second Lien, 7.104%, (1 mo. USD LIBOR + 7.00%), 5/29/26 1,075 1,081,047
Seattle Spinco, Inc., Term Loan, 2.854%, (1 mo. USD LIBOR + 2.75%), 6/21/24 454 451,470
Sophia L.P., Term Loan, 4.25%, (3 mo. USD LIBOR + 3.50%, Floor 0.75%), 10/7/27 1,346 1,347,323
Sovos Compliance, LLC:
Term Loan, 4.50%, 8/11/28 (9) 40 40,674
Term Loan, 5.00%, (1 mo. USD LIBOR + 4.50%, Floor 0.50%), 8/11/28 235 235,529

10 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2021

Portfolio of Investments (Unaudited) — continued

Borrower/Description Value
Electronics / Electrical (continued)
SurveyMonkey, Inc., Term Loan, 3.86%, (1 mo. USD LIBOR + 3.75%), 10/10/25 461 $ 458,869
Symplr Software, Inc., Term Loan, 5.25%, (3 mo. USD LIBOR + 4.50%, Floor 0.75%), 12/22/27 397 398,439
Tibco Software, Inc., Term Loan - Second Lien, 7.36%, (1 mo. USD LIBOR + 7.25%), 3/3/28 2,250 2,261,250
TTM Technologies, Inc., Term Loan, 2.599%, (1 mo. USD LIBOR + 2.50%), 9/28/24 64 64,258
Turing Midco, LLC, Term Loan, 3.50%, (1 mo. USD LIBOR + 3.00%, Floor 0.50%), 3/23/28 143 142,556
Uber Technologies, Inc., Term Loan, 3.604%, (1 mo. USD LIBOR + 3.50%), 4/4/25 1,497 1,499,093
Ultimate Software Group, Inc. (The), Term Loan, 3.75%, (3 mo. USD LIBOR + 3.25%, Floor 0.50%),
5/4/26 1,082 1,077,867
Valkyr Purchaser, LLC, Term Loan, 4.75%, (3 mo. USD LIBOR + 4.00%, Floor 0.75%), 11/5/27 372 373,118
Verisure Holding AB, Term Loan, 3.25%, (6 mo. EURIBOR + 3.25%), 3/27/28 EUR 375 424,951
Veritas US, Inc.:
Term Loan, 5.75%, (3 mo. EURIBOR+ 4.75%, Floor 1.00%), 9/1/25 EUR 148 169,628
Term Loan, 6.00%, (3 mo. USD LIBOR + 5.00%, Floor 1.00%), 9/1/25 1,210 1,211,042
Vision Solutions, Inc., Term Loan, 4.75%, (3 mo. USD LIBOR +
4.00%, Floor 0.75%), 4/24/28 748 748,125
$ 38,141,124
Equipment Leasing — 0.6%
Boels Topholding B.V., Term Loan, 3.25%, (3 mo. EURIBOR + 3.25%), 2/6/27 EUR 275 $ 312,745
PECF USS Intermediate Holding III Corporation, Term Loan, 12/15/28 (11) 450 451,012
$ 763,757
Financial Intermediaries — 1.5%
AllSpring Buyer, LLC, Term Loan, 11/1/28 (11) 399 $ 400,370
Edelman Financial Center, LLC, Term Loan, 4.25%, (1 mo. USD LIBOR + 3.50%, Floor 0.75%),
4/7/28 448 447,968
EIG Management Company, LLC, Term Loan, 4.50%, (1 mo. USD LIBOR + 3.75%, Floor 0.75%),
2/22/25 120 119,899
Focus Financial Partners, LLC:
Term Loan, 4.75%, (USD Prime + 1.50%), 6/24/28 94 93,174
Term Loan, 3.00%, (1 mo. USD LIBOR + 2.50%, Floor 0.50%), 7/1/28 404 402,745
GreenSky Holdings, LLC, Term Loan, 5.50%, (1 mo. USD LIBOR + 4.50%, Floor 1.00%), 3/29/25 222 222,040
Borrower/Description Value
Financial Intermediaries (continued)
Mariner Wealth Advisors, LLC:
Term Loan, 3.45%, (3 mo. USD LIBOR + 3.25%, Floor 0.50%), 8/18/28 (9) 16 $ 15,551
Term Loan, 3.75%, (3 mo. USD LIBOR + 3.25%, Floor 0.50%),
8/18/28 109 108,692
$ 1,810,439
Food Products — 1.0%
8th Avenue Food & Provisions, Inc., Term Loan, 5.50%, (1 mo. USD LIBOR + 4.75%, Floor 0.75%),
10/1/25 150 $ 151,495
Alltech, Inc., Term Loan, 4.50%, (1 mo. USD LIBOR + 4.00%, Floor 0.50%), 10/13/28 125 125,313
CHG PPC Parent, LLC, Term Loan, 3.50%, (1 mo. USD LIBOR + 3.00%, Floor 0.50%), 12/8/28 125 124,531
Monogram Food Solutions, LLC, Term Loan, 4.50%, (1 mo. USD LIBOR + 4.00%, Floor 0.50%),
8/28/28 125 125,000
Shearer’s Foods, Inc., Term Loan, 4.25%, (1 mo. USD LIBOR + 3.50%, Floor 0.75%), 9/23/27 198 197,423
Simply Good Foods USA, Inc., Term Loan, 4.75%, (1 mo. USD LIBOR + 3.75%, Floor 1.00%),
7/7/24 115 116,098
United Petfood Group B.V., Term Loan, 3.25%, (6 mo. EURIBOR +
3.25%), 4/23/28 EUR 350 395,486
$ 1,235,346
Food Service — 0.7%
AI Aqua Merger Sub, Inc.:
Term Loan, 7/31/28 (11) 67 $ 66,833
Term Loan, 7/31/28 (11) 533 534,667
Sovos Brands Intermediate, Inc., Term Loan, 4.50%, (3 mo. USD
LIBOR + 3.75%, Floor 0.75%), 6/8/28 269 269,624
$ 871,124
Food / Drug Retailers — 0.4%
L1R HB Finance Limited:
Term Loan, 4.25%, (3 mo. EURIBOR + 4.25%), 9/2/24 EUR 200 $ 215,582
Term Loan, 5.441%, (3 mo. GBP LIBOR + 5.25%), 9/2/24 GBP 200 252,610
$ 468,192
Forest Products — 0.5%
Journey Personal Care Corp., Term Loan, 5.50%, (3 mo. USD
LIBOR + 4.25%, Floor 1.25%), 3/1/28 572 $ 572,483
$ 572,483

11 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2021

Portfolio of Investments (Unaudited) — continued

Borrower/Description Value
Health Care — 12.6%
Accelerated Health Systems, LLC, Term Loan, 3.602%, (1 mo. USD LIBOR + 3.50%), 10/31/25 243 $ 241,742
AEA International Holdings (Lux) S.a.r.l., Term Loan, 4.25%, (3 mo. USD LIBOR + 3.75%, Floor 0.50%),
9/7/28 275 275,344
Bayou Intermediate II, LLC, Term Loan, 5.25%, (3 mo. USD LIBOR + 4.50%, Floor 0.75%), 8/2/28 400 400,500
Biogroup-LCD, Term Loan, 3.50%, (6 mo. EURIBOR + 3.50%), 1/28/28 EUR 125 141,263
BW NHHC Holdco, Inc., Term Loan, 5.16%, (3 mo. USD LIBOR + 5.00%), 5/15/25 1,045 893,222
Cano Health, LLC, Term Loan, 5.25%, (3 mo. USD LIBOR + 4.50%, Floor 0.75%), 11/23/27 1,000 1,001,849
CCRR Parent, Inc., Term Loan, 4.50%, (3 mo. USD LIBOR + 3.75%, Floor 0.75%), 3/6/28 248 249,477
Cerba Healthcare S.A.S., Term Loan, 3.75%, (3 mo. EURIBOR + 3.75%), 6/30/28 EUR 125 142,447
Certara L.P., Term Loan, 3.604%, (1 mo. USD LIBOR + 3.50%), 8/15/26 479 477,740
CHG Healthcare Services, Inc., Term Loan, 4.00%, (3 mo. USD LIBOR + 3.50%, Floor 0.50%), 9/29/28 274 274,638
CryoLife, Inc., Term Loan, 4.50%, (3 mo. USD LIBOR + 3.50%, Floor 1.00%), 6/1/27 216 216,270
Electron BidCo, Inc., Term Loan, 3.75%, (3 mo. USD LIBOR + 3.25%, Floor 0.50%), 11/1/28 200 199,768
Envision Healthcare Corporation, Term Loan, 3.854%, (1 mo. USD LIBOR + 3.75%), 10/10/25 1,160 936,685
eResearchTechnology, Inc., Term Loan, 5.50%, (1 mo. USD LIBOR + 4.50%, Floor 1.00%), 2/4/27 149 149,722
GHX Ultimate Parent Corporation, Term Loan, 4.25%, (3 mo. USD LIBOR + 3.25%, Floor 1.00%),
6/28/24 431 430,849
Hanger, Inc., Term Loan, 3.604%, (1 mo. USD LIBOR + 3.50%), 3/6/25 481 481,551
IQVIA, Inc., Term Loan, 1.854%, (1 mo. USD LIBOR + 1.75%), 3/7/24 299 298,166
IVC Acquisition Ltd., Term Loan, 2/13/26 (11) EUR 400 456,776
LSCS Holdings, Inc., Term Loan, 12/18/28 (11) 175 175,437
Medical Solutions, LLC:
Term Loan, 0.00%, 11/1/28 (9) 56 55,986
Term Loan, 4.00%, (6 mo. USD LIBOR + 3.50%, Floor 0.50%), 11/1/28 294 293,926
Medline Industries, Inc., Term Loan,
10/23/28 (11) 1,000 1,000,312
Midwest Physician Administrative Services, LLC, Term Loan, 4.00%, (3 mo. USD LIBOR + 3.25%, Floor 0.75%),
3/12/28 248 247,059
Option Care Health, Inc., Term Loan, 3.25%, (1 mo. USD LIBOR + 2.75%, Floor 0.50%), 10/27/28 100 99,975
Pacific Dental Services, LLC, Term Loan, 4.00%, (1 mo. USD LIBOR + 3.25%, Floor 0.75%), 5/5/28 274 274,052
Borrower/Description Value
Health Care (continued)
Phoenix Guarantor, Inc., Term Loan, 3.354%, (1 mo. USD LIBOR + 3.25%), 3/5/26 746 $ 742,728
Project Ruby Ultimate Parent Corp., Term Loan, 4.00%, (1 mo. USD LIBOR + 3.25%, Floor 0.75%),
3/3/28 546 545,534
Radiology Partners, Inc., Term Loan, 4.405%, (1 mo. USD LIBOR + 4.25%), 7/9/25 150 148,148
Sotera Health Holdings, LLC, Term Loan, 3.25%, (3 mo. USD LIBOR + 2.75%, Floor 0.50%), 12/11/26 300 299,312
Sound Inpatient Physicians, Term Loan, 2.854%, (1 mo. USD LIBOR + 2.75%), 6/27/25 217 216,616
Sunshine Luxembourg VII S.a.r.l., Term Loan, 4.50%, (3 mo. USD LIBOR + 3.75%, Floor 0.75%),
10/1/26 546 547,069
Surgery Center Holdings, Inc., Term Loan, 4.50%, (1 mo. USD LIBOR + 3.75%, Floor 0.75%), 8/31/26 721 722,043
Synlab Bondco PLC, Term Loan, 2.50%, (6 mo. EURIBOR + 2.50%), 7/1/27 EUR 150 169,891
Team Health Holdings, Inc., Term Loan, 3.75%, (1 mo. USD LIBOR + 2.75%, Floor 1.00%), 2/6/24 1,315 1,262,991
U.S. Anesthesia Partners, Inc., Term Loan, 4.75%, (6 mo. USD LIBOR + 4.25%, Floor 0.50%), 10/1/28 274 273,970
Verscend Holding Corp., Term Loan, 4.104%, (1 mo. USD LIBOR + 4.00%), 8/27/25 708 708,485
WP CityMD Bidco, LLC, Term Loan, 3.75%, (6 mo. USD LIBOR + 3.25%,
Floor 0.50%), 12/22/28 175 175,044
$ 15,226,587
Home Furnishings — 2.1%
Conair Holdings, LLC, Term Loan, 4.25%, (3 mo. USD LIBOR + 3.75%, Floor 0.50%), 5/17/28 599 $ 599,409
Mattress Firm, Inc., Term Loan, 5.00%, (12 mo. USD LIBOR + 4.25%, Floor 0.75%), 9/25/28 324 322,567
Serta Simmons Bedding, LLC:
Term Loan, 8.50%, (1 mo. USD LIBOR + 7.50%, Floor 1.00%), 8/10/23 519 525,593
Term Loan - Second Lien, 8.50%, (1 mo. USD LIBOR + 7.50%, Floor
1.00%), 8/10/23 1,190 1,120,721
$ 2,568,290
Industrial Equipment — 5.2%
Albion Financing 3 S.a.r.l., Term Loan, 5.75%, (3 mo. USD LIBOR + 5.25%, Floor 0.50%), 8/17/26 400 $ 401,750
Alliance Laundry Systems, LLC, Term Loan, 4.25%, (3 mo. USD LIBOR + 3.50%, Floor 0.75%),
10/8/27 539 539,377
American Trailer World Corp., Term Loan, 4.50%, (1 mo. USD LIBOR + 3.75%, Floor 0.75%), 3/3/28 274 273,026
Delachaux Group S.A.:
Term Loan, 3.75%, (3 mo. EURIBOR + 3.75%), 4/16/26 EUR 172 196,344

12 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2021

Portfolio of Investments (Unaudited) — continued

Borrower/Description Value
Industrial Equipment (continued)
Delachaux Group S.A.: (continued)
Term Loan, 4.629%, (3 mo. USD LIBOR + 4.50%), 4/16/26 221 $ 219,673
DexKo Global, Inc.:
Term Loan, 2.00%, 10/4/28 (9) EUR 22 24,541
Term Loan, 3.415%, (3 mo. USD LIBOR + 3.75%, Floor 0.50%), 10/4/28 (9) 32 31,937
Term Loan, 4.00%, (3 mo. EURIBOR + 4.00%), 9/22/28 EUR 70 79,315
Term Loan, 4.00%, (3 mo. EURIBOR + 4.00%), 9/22/28 EUR 134 152,520
Term Loan, 4.25%, (3 mo. USD LIBOR + 3.75%, Floor 0.50%), 10/4/28 168 167,672
DiversiTech Holdings, Inc.:
Term Loan, 12/16/28 (11) 34 34,586
Term Loan, 12/16/28 (11) 166 165,766
DXP Enterprises, Inc., Term Loan, 5.75%, (1 mo. USD LIBOR + 4.75%, Floor 1.00%), 12/16/27 248 246,881
Dynacast International, LLC, Term Loan, 10.25%, (3 mo. USD LIBOR + 9.25%, Floor 1.00%), 10/22/25 164 167,576
Engineered Machinery Holdings, Inc., Term Loan, 4.50%, (3 mo. USD LIBOR + 3.75%, Floor 0.75%),
5/19/28 896 895,130
Filtration Group Corporation, Term Loan, 4.00%, (1 mo. USD LIBOR + 3.50%, Floor 0.50%), 10/21/28 175 174,606
GrafTech Finance, Inc., Term Loan, 3.50%, (1 mo. USD LIBOR + 3.00%, Floor 0.50%), 2/12/25 627 628,712
Granite Holdings US Acquisition Co., Term Loan, 4.224%, (3 mo. USD LIBOR + 4.00%), 9/30/26 545 545,557
LTI Holdings, Inc.:
Term Loan, 4.854%, (1 mo. USD LIBOR + 4.75%), 7/24/26 103 103,415
Term Loan, 4.854%, (1 mo. USD LIBOR + 4.75%), 7/24/26 171 171,497
Madison Safety & Flow, LLC, Term Loan,
12/14/28 (11) 125 125,156
Vertical US Newco, Inc., Term Loan, 4.00%, (6 mo. USD LIBOR + 3.50%, Floor 0.50%), 7/30/27 593 593,648
Zephyr German BidCo GmbH, Term Loan, 3.75%, (3 mo. EURIBOR +
3.75%), 3/10/28 EUR 300 342,703
$ 6,281,388
Insurance — 1.1%
AssuredPartners, Inc., Term Loan,
2/12/27 (11) 700 $ 695,625
NFP Corp., Term Loan, 3.354%, (1 mo. USD LIBOR + 3.25%),
2/15/27 597 588,168
$ 1,283,793
Leisure Goods / Activities / Movies — 6.4%
AMC Entertainment Holdings, Inc., Term Loan, 3.103%, (1 mo. USD LIBOR + 3.00%), 4/22/26 827 $ 746,856
Borrower/Description Value
Leisure Goods / Activities / Movies (continued)
Amer Sports Oyj, Term Loan, 4.50%, (6 mo. EURIBOR + 4.50%), 3/30/26 EUR 800 $ 912,080
Carnival Corporation:
Term Loan, 3.75%, (3 mo. USD LIBOR + 3.00%, Floor 0.75%), 6/30/25 616 609,854
Term Loan, 4.00%, (6 mo. USD LIBOR + 3.25%, Floor 0.75%), 10/18/28 650 644,312
ClubCorp Holdings, Inc., Term Loan, 2.97%, (3 mo. USD LIBOR + 2.75%), 9/18/24 398 384,279
Crown Finance US, Inc.:
Term Loan, 3.50%, (6 mo. USD LIBOR + 2.50%, Floor 1.00%), 2/28/25 943 730,781
Term Loan, 3.75%, (6 mo. USD LIBOR + 2.75%, Floor 1.00%), 9/30/26 686 523,676
Term Loan, 15.25%, (7.00% cash, 8.25% PIK),
5/23/24 (12) 352 419,915
Lindblad Expeditions, Inc.:
Term Loan, 6.00%, (1 mo. USD LIBOR + 5.25%, Floor 0.75%), 4.75% cash, 1.25% PIK, 3/27/25 173 166,658
Term Loan, 6.00%, (1 mo. USD LIBOR + 5.25%, Floor 0.75%), 4.75% cash, 1.25% PIK, 3/27/25 691 666,632
Sandy BidCo B.V., Term Loan, 6/12/28 (11) EUR 275 314,098
SeaWorld Parks & Entertainment, Inc., Term Loan, 3.50%, (1 mo. USD LIBOR + 3.00%, Floor 0.50%),
8/25/28 224 223,820
Vue International Bidco PLC, Term Loan, 4.75%, (6 mo. EURIBOR +
4.75%), 7/3/26 EUR 1,333 1,418,553
$ 7,761,514
Lodging and Casinos — 1.3%
Boyd Gaming Corporation, Term Loan, 2.354%, (1 mo. USD LIBOR + 2.25%), 9/15/23 296 $ 296,644
Oravel Stays Singapore Pte. Ltd., Term Loan, 9.00%, (3 mo. USD LIBOR + 8.25%, Floor 0.75%),
6/23/26 274 284,570
Raptor Acquisition Corp., Term Loan, 4.75%, (3 mo. USD LIBOR + 4.00%, Floor 0.75%), 11/1/26 450 450,844
Sportradar Capital S.a.r.l., Term Loan, 3.50%, (6 mo. EURIBOR + 3.50%), 11/22/27 EUR 250 284,744
Twin River Worldwide Holdings, Inc., Term Loan, 3.75%, (6 mo. USD
LIBOR + 3.25%, Floor 0.50%), 10/2/28 300 300,431
$ 1,617,233
Nonferrous Metals / Minerals — 0.3%
Oxbow Carbon, LLC, Term Loan, 5.00%, (1 mo. USD LIBOR + 4.25%,
Floor 0.75%), 10/17/25 328 $ 329,150
$ 329,150

13 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2021

Portfolio of Investments (Unaudited) — continued

Borrower/Description Value
Oil and Gas — 6.7%
Ameriforge Group, Inc., Term Loan, 12.581%, (1 mo. USD LIBOR + 13.00%, Floor 1.00%), 12/31/23 (9) 23 $ 11,445
Apergy Corporation, Term Loan, 2.625%, (1 mo. USD LIBOR + 2.50%), 5/9/25 59 58,778
Centurion Pipeline Company, LLC:
Term Loan, 3.34%, (1 mo. USD LIBOR + 3.25%), 9/29/25 121 120,492
Term Loan, 4.104%, (1 mo. USD LIBOR + 4.00%), 9/28/25 99 99,000
CITGO Holding, Inc., Term Loan, 8.00%, (3 mo. USD LIBOR + 7.00%, Floor 1.00%), 8/1/23 1,105 1,091,482
CITGO Petroleum Corporation, Term Loan, 7.25%, (3 mo. USD LIBOR + 6.25%, Floor 1.00%), 3/28/24 2,181 2,183,721
CQP Holdco L.P., Term Loan, 4.25%, (3 mo. USD LIBOR + 3.75%, Floor 0.50%), 6/5/28 1,022 1,020,085
Delek US Holdings, Inc., Term Loan, 6.50%, (1 mo. USD LIBOR + 5.50%, Floor 1.00%), 3/31/25 2,733 2,745,117
Freeport LNG Investments, LLLP, Term Loan, 4.00%, (3 mo. USD LIBOR + 3.50%, Floor 0.50%),
12/21/28 175 173,505
Oryx Midstream Services Permian Basin, LLC, Term Loan, 3.75%, (3 mo. USD LIBOR + 3.25%, Floor 0.50%),
10/5/28 200 198,964
QuarterNorth Energy Holding, Inc., Term Loan - Second Lien, 9.00%,
(3 mo. USD LIBOR + 8.00%, Floor 1.00%), 8/27/26 378 379,069
$ 8,081,658
Publishing — 1.8%
Adevinta ASA:
Term Loan, 3.00%, (3 mo. EURIBOR + 3.00%), 6/26/28 EUR 575 $ 657,326
Term Loan, 3.50%, (3 mo. USD LIBOR + 2.75%, Floor 0.75%), 6/26/28 149 149,548
Alchemy Copyrights, LLC, Term Loan, 3.50%, (1 mo. USD LIBOR + 3.00%, Floor 0.50%), 3/10/28 222 222,749
Ascend Learning, LLC, Term Loan,
12/11/28 (11) 175 174,869
Getty Images, Inc., Term Loan, 4.625%, (1 mo. USD LIBOR + 4.50%), 2/19/26 768 769,617
LABL, Inc., Term Loan, 5.50%, (1 mo. USD LIBOR + 5.00%, Floor
0.50%), 10/29/28 175 175,054
$ 2,149,163
Radio and Television — 1.6%
Gray Television, Inc.:
Term Loan, 2.599%, (1 mo. USD LIBOR + 2.50%), 2/7/24 116 $ 115,801
Term Loan, 2.599%, (1 mo. USD LIBOR + 2.50%), 1/2/26 276 274,384
Borrower/Description Value
Radio and Television (continued)
Gray Television, Inc.: (continued)
Term Loan, 3.099%, (1 mo. USD LIBOR + 3.00%), 12/1/28 250 $ 249,140
Hubbard Radio, LLC, Term Loan, 5.25%, (1 mo. USD LIBOR + 4.25%, Floor 1.00%), 3/28/25 250 251,010
Nexstar Broadcasting, Inc., Term Loan, 2.599%, (1 mo. USD LIBOR + 2.50%), 9/18/26 216 215,513
Sinclair Television Group, Inc., Term Loan, 2.61%, (1 mo. USD LIBOR + 2.50%), 9/30/26 293 288,668
Univision Communications, Inc., Term Loan, 4.00%, (1 mo. USD LIBOR
+ 3.25%, Floor 0.75%), 3/15/26 597 598,866
$ 1,993,382
Retailers (Except Food and Drug) — 4.0%
CNT Holdings I Corp., Term Loan, 4.25%, (6 mo. USD LIBOR + 3.50%, Floor 0.75%), 11/8/27 697 $ 698,072
Gloves Buyer, Inc., Term Loan, 4.75%, (1 mo. USD LIBOR + 4.00%, Floor 0.75%), 12/29/27 699 696,879
Great Outdoors Group, LLC, Term Loan, 4.50%, (3 mo. USD LIBOR + 3.75%, Floor 0.75%), 3/6/28 1,287 1,290,041
Harbor Freight Tools USA, Inc., Term Loan, 3.25%, (1 mo. USD LIBOR + 2.75%, Floor 0.50%),
10/19/27 997 996,624
LIDS Holdings, Inc., Term Loan, 6.50%, (1 mo. USD LIBOR + 5.50%, Floor 1.00%), 12/14/26 125 123,125
PetSmart, Inc., Term Loan, 4.50%, (3 mo. USD LIBOR + 3.75%, Floor 0.75%), 2/11/28 998 1,000,825
Phillips Feed Service, Inc., Term Loan, 8.00%, (3 mo. USD LIBOR +
7.00%, Floor 1.00%), 11/13/24 (3) 50 39,822
$ 4,845,388
Steel — 0.7%
Phoenix Services International, LLC, Term Loan, 4.75%, (1 mo. USD LIBOR + 3.75%, Floor 1.00%),
3/1/25 385 $ 382,835
TMS International Corp., Term Loan, 3.75%, (USD LIBOR + 2.75%, Floor 1.00%), 8/14/24 (10) 124 124,059
Zekelman Industries, Inc., Term Loan, 2.103%, (1 mo. USD LIBOR +
2.00%), 1/24/27 291 288,131
$ 795,025
Surface Transport — 0.6%
PODS, LLC, Term Loan, 3/31/28 (11) 750 $ 748,393
$ 748,393
Telecommunications — 2.6%
Avaya, Inc., Term Loan, 4.11%, (1 mo. USD LIBOR + 4.00%), 12/15/27 100 $ 100,070

14 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2021

Portfolio of Investments (Unaudited) — continued

Borrower/Description Principal Amount* (000’s omitted) Value
Telecommunications (continued)
GEE Holdings 2, LLC:
Term Loan, 9.00%, (3 mo. USD LIBOR + 8.00%, Floor 1.00%), 3/24/25 186 $ 184,475
Term Loan - Second Lien, 9.25%, (3 mo. USD LIBOR + 8.25%, Floor 1.00%), 2.50% cash, 6.75% PIK,
3/23/26 378 343,773
Intelsat Jackson Holdings S.A.:
DIP Loan, 5.392%, (3 mo. USD LIBOR + 4.75%, Floor 1.00%), 10/13/22 (9) 625 627,344
Term Loan, 8.00%, (USD Prime + 4.75%), 11/27/23 650 650,812
Term Loan, 8.75%, (USD Prime + 5.50%), 1/2/24 850 850,531
Syniverse Holdings, Inc., Term Loan, 6.00%, (3 mo. USD LIBOR +
5.00%, Floor 1.00%), 3/9/23 457 454,616
$ 3,211,621
Utilities — 0.6%
USIC Holdings, Inc., Term Loan, 4.25%, (1 mo. USD LIBOR + 3.50%,
Floor 0.75%), 5/12/28 698 $ 698,250
$ 698,250
Total Senior Floating-Rate
Loans (identified cost $160,260,270) $ 159,916,869
Warrants — 0.0%
Security Shares Value
Leisure Goods / Activities / Movies — 0.0%
Cineworld Group PLC, Exp. 11/23/25 (4)(5) 102,872 $ 0
$ 0
Retailers (Except Food and Drug) — 0.0%
David’s Bridal, LLC, Exp. 11/26/22 (3)(4)(5) 2,169 $ 0
$ 0
Total Warrants (identified
cost $0) $ 0
Miscellaneous — 0.0%
Security Shares Value
Cable and Satellite Television — 0.0%
ACC Claims Holdings, LLC (3)(5) 200,340 $ 0
Total Miscellaneous (identified cost
$0) $ 0
Short-Term Investments — 6.7% — Description Units Value
Eaton Vance Cash Reserves Fund, LLC, 0.08% (13) 8,080,158 $ 8,079,350
Total Short-Term Investments (identified
cost $8,079,350) $ 8,079,350
Total Investments —
157.2% (identified cost $191,625,460) $ 190,532,991
Less Unfunded Loan Commitments —
(0.4)% $ (444,116 )
Net Investments — 156.8% (identified
cost $191,181,344) $ 190,088,875
Other Assets, Less Liabilities
— (25.8)% $ (31,289,468 )
Auction Preferred Shares Plus
Cumulative Unpaid Dividends — (31.0)% $ (37,600,191 )
Net Assets Applicable to Common
Shares — 100.0% $ 121,199,216

The percentage shown for each investment category in the Portfolio of Investments is based on net assets applicable to common shares.

  • In U.S. dollars unless otherwise indicated.

(1) Security exempt from registration under Rule 144A of the Securities Act of 1933, as amended. These securities may be sold in certain transactions in reliance on an exemption from registration (normally to qualified institutional buyers). At December 31, 2021, the aggregate value of these securities is $15,708,617 or 13.0% of the Trust’s net assets applicable to common shares.

(2) Variable rate security. The stated interest rate represents the rate in effect at December 31, 2021.

(3) For fair value measurement disclosure purposes, security is categorized as Level 3 (see Note 11).

(4) Security was acquired in connection with a restructuring of a Senior Loan and may be subject to restrictions on resale.

(5) Non-income producing security.

(6) Amount is less than 0.05%.

(7) Restricted security (see Note 7).

(8) Senior floating-rate loans (Senior Loans) often require prepayments from excess cash flows or permit the borrowers to repay at their election. The degree to which borrowers repay, whether as a contractual requirement or at their election, cannot be predicted with accuracy. As a result, the actual remaining maturity may be substantially less than the stated maturities shown. However, Senior Loans will typically have an expected average life of approximately two to four years. Senior Loans typically have rates of interest which are redetermined periodically by reference to a base lending rate, plus a spread. These base lending rates are primarily the London Interbank Offered Rate (“LIBOR”) and secondarily, the prime rate offered by one or more major United States banks (the “Prime Rate”). Base lending rates may be subject to a floor, or a minimum rate. Senior Loans are generally subject to contractual restrictions that must be satisfied before they can be bought or sold.

15 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2021

Portfolio of Investments (Unaudited) — continued

(9) Unfunded or partially unfunded loan commitments. The stated interest rate reflects the weighted average of the reference rate and spread for the funded portion, if any, and the commitment fees on the portion of the loan that is unfunded. At December 31, 2021, the total value of unfunded loan commitments is $443,133. See Note 1F for description.

(10) The stated interest rate represents the weighted average interest rate at December 31, 2021 of contracts within the senior loan facility. Interest rates on contracts are primarily redetermined either weekly, monthly or quarterly by reference to the indicated base lending rate and spread and the reset period.

(11) This Senior Loan will settle after December 31, 2021, at which time the interest rate will be determined.

(12) Fixed-rate loan.

(13) Affiliated investment company, available to Eaton Vance portfolios and funds, which invests in high quality, U.S. dollar denominated money market instruments. The rate shown is the annualized seven-day yield as of December 31, 2021.

Forward Foreign Currency Exchange Contracts — Currency Purchased Currency Sold Counterparty Settlement Date Unrealized Appreciation Unrealized (Depreciation)
EUR 18,904 USD 21,368 HSBC Bank USA, N.A. 1/4/22 $ 153 $ —
EUR 408,601 USD 461,840 JPMorgan Chase Bank, N.A. 1/4/22 3,353 —
EUR 3,889,626 USD 4,423,282 Standard Chartered Bank 1/4/22 5,055 —
EUR 2,982,139 USD 3,370,571 State Street Bank and Trust Company 1/4/22 24,593 —
USD 8,228,087 EUR 7,299,269 Standard Chartered Bank 1/4/22 — (82,128 )
USD 462,097 EUR 408,601 JPMorgan Chase Bank, N.A. 1/31/22 — (3,347 )
USD 3,945,236 EUR 3,481,025 State Street Bank and Trust Company 1/31/22 — (20,050 )
USD 424,122 GBP 314,135 HSBC Bank USA, N.A. 1/31/22 — (1,050 )
USD 386,373 GBP 281,234 State Street Bank and Trust Company 1/31/22 5,730 —
USD 393,367 GBP 286,275 State Street Bank and Trust Company 1/31/22 5,902 —
USD 4,425,748 EUR 3,889,626 Standard Chartered Bank 2/2/22 — (5,160 )
USD 3,374,403 EUR 2,982,139 State Street Bank and Trust Company 2/28/22 — (24,505 )
USD 1,027,091 EUR 907,487 State Street Bank and Trust Company 2/28/22 — (7,222 )
$ 44,786 $ (143,462 )

Abbreviations:

DIP – Debtor In Possession
EURIBOR – Euro Interbank Offered Rate
LIBOR – London Interbank Offered Rate
PIK – Payment In Kind
SOFR – Secured Overnight Financing Rate
SONIA – Sterling Overnight Interbank Average

Currency Abbreviations:

EUR – Euro
GBP – British Pound Sterling
USD – United States Dollar

16 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2021

Statement of Assets and Liabilities (Unaudited)

Assets December 31, 2021
Unaffiliated investments, at value (identified cost, $183,101,994) $ 182,009,525
Affiliated investment, at value (identified cost, $8,079,350) 8,079,350
Cash 2,084,910
Foreign currency, at value (identified cost, $3,198,987) 3,216,657
Interest and dividends receivable 821,622
Dividends receivable from affiliated investment 455
Receivable for investments sold 11,181
Receivable for open forward foreign currency exchange contracts 44,786
Prepaid upfront fees on notes payable 33,515
Prepaid expenses 22,977
Total assets $ 196,324,978
Liabilities
Notes payable $ 25,000,000
Payable for investments purchased 12,074,411
Payable for open forward foreign currency exchange contracts 143,462
Payable to affiliates:
Investment adviser fee 113,239
Administration fee 38,781
Trustees’ fees 3,500
Accrued expenses 152,178
Total liabilities $ 37,525,571
Auction preferred shares (1,504 shares outstanding) at liquidation
value plus cumulative unpaid dividends $ 37,600,191
Net assets applicable to common shares $ 121,199,216
Sources of Net Assets
Common shares, $0.01 par value, unlimited number of shares authorized, 17,538,858 shares issued and
outstanding $ 175,389
Additional paid-in capital 139,723,100
Accumulated loss (18,699,273 )
Net assets applicable to common shares $ 121,199,216
Net Asset Value Per Common Share
($121,199,216 ÷ 17,538,858 common shares issued and
outstanding) $ 6.91

17 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2021

Statement of Operations (Unaudited)

Investment Income Six Months Ended December 31, 2021
Interest and other income $ 4,933,706
Dividends 144,166
Dividends from affiliated investment 5,634
Total investment income $ 5,083,506
Expenses
Investment adviser fee $ 802,291
Administration fee 274,757
Trustees’ fees and expenses 7,954
Custodian fee 47,854
Transfer and dividend disbursing agent fees 9,484
Legal and accounting services 162,896
Printing and postage 31,205
Interest expense and fees 336,280
Preferred shares service fee 16,304
Miscellaneous 55,745
Total expenses $ 1,744,770
Net investment income $ 3,338,736
Realized and Unrealized Gain (Loss)
Net realized gain (loss) —
Investment transactions $ 2,505,810
Investment transactions — affiliated investment (237 )
Foreign currency transactions (166,783 )
Forward foreign currency exchange contracts 1,339,867
Net realized gain $ 3,678,657
Change in unrealized appreciation (depreciation) —
Investments $ (4,635,077 )
Investments — affiliated investment (72 )
Foreign currency 142,352
Forward foreign currency exchange contracts (697,144 )
Net change in unrealized appreciation (depreciation) $ (5,189,941 )
Net realized and unrealized loss $ (1,511,284 )
Distributions to preferred shareholders $ (16,690 )
Net increase in net assets from operations $ 1,810,762

18 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2021

Statements of Changes in Net Assets

Increase (Decrease) in Net Assets Six Months Ended December 31, 2021 (Unaudited) Year Ended June 30, 2021
From operations —
Net investment income $ 3,338,736 $ 15,377,705
Net realized gain (loss) 3,678,657 (6,854,557 )
Net change in unrealized appreciation (depreciation) (5,189,941 ) 33,696,160
Distributions to preferred shareholders (16,690 ) (39,831 )
Net increase in net assets from operations $ 1,810,762 $ 42,179,477
Distributions to common shareholders $ (4,017,801 ) $ (15,411,709 )
Capital share transactions —
Reinvestment of distributions to common shareholders $ 17,633 $ —
Cost of shares repurchased in tender offer (see Note 6) (138,036,580 ) —
Net decrease in net assets from capital share
transactions $ (138,018,947 ) $ —
Net increase (decrease) in net assets $ (140,225,986 ) $ 26,767,768
Net Assets Applicable to Common Shares
At beginning of period $ 261,425,202 $ 234,657,434
At end of period $ 121,199,216 $ 261,425,202

19 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2021

Statement of Cash Flows (Unaudited)

Cash Flows From Operating Activities Six Months Ended December 31, 2021
Net increase in net assets from operations $ 1,810,762
Distributions to preferred shareholders 16,690
Net increase in net assets from operations excluding distributions to preferred shareholders $ 1,827,452
Adjustments to reconcile net increase in net assets from operations to net cash provided by operating
activities:
Investments purchased (61,208,577 )
Investments sold and principal repayments 278,986,611
Increase in short-term investments, net (3,049,367 )
Net amortization/accretion of premium (discount) (188,442 )
Amortization of prepaid upfront fees on notes payable 97,335
Decrease in interest and dividends receivable 873,542
Increase in dividends receivable from affiliated investment (208 )
Decrease in receivable for open forward foreign currency exchange contracts 555,126
Increase in prepaid expenses (13,263 )
Decrease in cash collateral due to broker (290,000 )
Increase in payable for open forward foreign currency exchange contracts 142,018
Decrease in payable to affiliate for investment adviser fee (880,154 )
Decrease in payable to affiliate for administration fee (43,733 )
Decrease in payable to affiliate for Trustees’ fees (1,660 )
Decrease in accrued expenses (143,866 )
Decrease in unfunded loan commitments (351,807 )
Net change in unrealized (appreciation) depreciation from investments 4,635,149
Net realized gain from investments (2,505,573 )
Net cash provided by operating activities $ 218,440,583
Cash Flows From Financing Activities
Cash distributions paid to common shareholders $ (4,000,168 )
Cash distributions paid to preferred shareholders (16,867 )
Repurchases of common shares in tender offer (138,036,580 )
Proceeds from notes payable 32,000,000
Repayments of notes payable (110,000,000 )
Net cash used in financing activities $ (220,053,615 )
Net decrease in cash and restricted cash* $ (1,613,032 )
Cash and restricted cash at beginning of period (including foreign
currency) $ 6,914,599
Cash at end of period (including foreign currency) $ 5,301,567
Supplemental disclosure of cash flow information:
Noncash financing activities not included herein consist of:
Reinvestment of dividends and distributions $ 17,633
Cash paid for interest and fees on borrowings 299,508
  • Includes net change in unrealized appreciation (depreciation) on foreign currency of $17,832.

20 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2021

Financial Highlights

Selected data for a common share outstanding during the periods stated

Six Months Ended December 31, 2021 (Unaudited) Year Ended June 30,
2021 2020 2019 2018 2017
Net asset value — Beginning of period (Common shares) $ 6.900 $ 6.200 $ 7.050 $ 7.180 $ 7.150 $ 6.650
Income (Loss) From Operations
Net investment income (1) $ 0.158 $ 0.406 $ 0.394 $ 0.410 $ 0.385 $ 0.404
Net realized and unrealized gain (loss) (0.021 ) 0.702 (0.817 ) (0.172 ) 0.038 0.436
Distributions to preferred shareholders —
From net investment income (1) (0.001 ) (0.001 ) (0.017 ) (0.031 ) (0.028 ) (0.014 )
Discount on redemption and repurchase of auction preferred shares (1) — — — 0.051 — 0.064
Total income (loss) from operations $ 0.136 $ 1.107 $ (0.440 ) $ 0.258 $ 0.395 $ 0.890
Less Distributions to Common Shareholders
From net investment income $ (0.192 ) $ (0.407 ) $ (0.410 ) $ (0.388 ) $ (0.365 ) $ (0.390 )
Total distributions to common shareholders $ (0.192 ) $ (0.407 ) $ (0.410 ) $ (0.388 ) $ (0.365 ) $ (0.390 )
Discount on tender offer (see Note 6) (1) $ 0.066 $ — $ — $ — $ — $ —
Net asset value — End of period (Common shares) $ 6.910 $ 6.900 $ 6.200 $ 7.050 $ 7.180 $ 7.150
Market value — End of period (Common shares) $ 6.740 $ 6.800 $ 5.330 $ 6.230 $ 6.380 $ 6.650
Total Investment Return on Net Asset Value (2) 2.99 % (3)(12) 18.65 % (5.64 )% 4.46 % (4) 6.12 % 14.02 % (5)
Total Investment Return on Market Value (2) 1.93 % (3) 36.01 % (8.20 )% 3.88 % 1.39 % 17.34 %

21 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2021

Financial Highlights — continued

Selected data for a common share outstanding during the periods stated

Ratios/Supplemental Data Six Months Ended December 31, 2021 (Unaudited) 2021 2020 2019 2018 2017
Net assets applicable to common shares, end of period (000’s omitted) $ 121,199 $ 261,425 $ 234,657 $ 266,926 $ 272,016 $ 270,810
Ratios (as a percentage of average daily net assets applicable to common shares): (6) †
Expenses excluding interest and fees 1.91 % (7) 1.96 % 1.73 % 1.73 % 1.82 % 1.87 %
Interest and fee expense (8) 0.46 % (7) 0.57 % 1.19 % 1.40 % 0.83 % 0.52 %
Total expenses 2.37 % (7) 2.53 % 2.92 % 3.13 % 2.65 % 2.39 %
Net investment income 4.54 % (7) 6.08 % 5.93 % 5.74 % 5.36 % 5.75 %
Portfolio Turnover 34 % (3) 40 % 57 % 26 % 34 % 42 %
Senior Securities:
Total notes payable outstanding (in 000’s) $ 25,000 $ 103,000 $ 95,000 $ 103,000 $ 93,000 $ 92,000
Asset coverage per $1,000 of notes payable (9) $ 7,352 $ 3,903 $ 3,866 $ 3,957 $ 4,587 $ 4,613
Total preferred shares outstanding 1,504 1,504 1,504 1,504 2,464 2,464
Asset coverage per preferred share (10) $ 73,402 $ 71,484 $ 69,242 $ 72,464 $ 68,989 $ 69,078
Involuntary liquidation preference per preferred
share (11) $ 25,000 $ 25,000 $ 25,000 $ 25,000 $ 25,000 $ 25,000
Approximate market value per preferred share (11) $ 25,000 $ 25,000 $ 25,000 $ 25,000 $ 25,000 $ 25,000

(1) Computed using average common shares outstanding.

(2) Returns are historical and are calculated by determining the percentage change in net asset value or market value with all distributions reinvested. Distributions are assumed to be reinvested at prices obtained under the Trust’s dividend reinvestment plan.

(3) Not annualized.

(4) The total return based on net asset value reflects the impact of the tender and repurchase by the Trust of a portion of its Auction Preferred Shares at 92% of the per share liquidation preference. Absent this transaction, the total return based on net asset value would have been 3.71%.

(5) The total return based on net asset value reflects the impact of the tender and repurchase by the Trust of a portion of its Auction Preferred Shares at 95% of the per share liquidation preference. Absent this transaction, the total return based on net asset value would have been 13.00%.

(6) Ratios do not reflect the effect of dividend payments to preferred shareholders.

(7) Annualized.

(8) Interest and fee expense relates to the notes payable to partially redeem the Trust’s Auction Preferred Shares and/or to fund investments (see Note 9).

(9) Calculated by subtracting the Trust’s total liabilities (not including the notes payable and preferred shares) from the Trust’s total assets, and dividing the result by the notes payable balance in thousands.

(10) Calculated by subtracting the Trust’s total liabilities (not including the notes payable and preferred shares) from the Trust’s total assets, dividing the result by the sum of the value of the notes payable and liquidation value of the preferred shares, and multiplying the result by the liquidation value of one preferred share. Such amount equates to 294%, 286%, 277%, 290%, 276% and 276% at December 31, 2021 and June 30, 2021, 2020, 2019, 2018 and 2017, respectively.

(11) Plus accumulated and unpaid dividends.

(12) The total return based on net asset value reflects the impact of the tender offer by the Trust for a portion of its common shares at 99% of the Trust’s net asset value. Absent this transaction, the total return based on net asset value would have been 1.80%. Costs associated with the tender offer were borne by the investment adviser.

† Ratios based on net assets applicable to common shares plus preferred shares and borrowings are presented below. Ratios do not reflect the effect of dividend payments to preferred shareholders. Ratios for periods less than one year are annualized.

2021 2020 2019 2018 2017
Expenses excluding interest and fees 1.32 % 1.25 % 1.11 % 1.12 % 1.17 % 1.21 %
Interest and fee expense 0.31 % 0.36 % 0.76 % 0.91 % 0.54 % 0.34 %
Total expenses 1.63 % 1.61 % 1.87 % 2.03 % 1.71 % 1.55 %
Net investment income 3.12 % 3.87 % 3.81 % 3.73 % 3.46 % 3.72 %

22 See Notes to Financial Statements.

Eaton Vance

Senior Income Trust

December 31, 2021

Notes to Financial Statements (Unaudited)

1 Significant Accounting Policies

Eaton Vance Senior Income Trust (the Trust) is a Massachusetts business trust registered under the Investment Company Act of 1940, as amended (the 1940 Act), as a diversified, closed-end management investment company. The Trust’s investment objective is to provide a high level of current income, consistent with the preservation of capital, by investing primarily in senior, secured floating-rate loans.

The following is a summary of significant accounting policies of the Trust. The policies are in conformity with accounting principles generally accepted in the United States of America (U.S. GAAP). The Trust is an investment company and follows accounting and reporting guidance in the Financial Accounting Standards Board (FASB) Accounting Standards Codification Topic 946.

A Investment Valuation — The following methodologies are used to determine the market value or fair value of investments.

Senior Floating-Rate Loans. Interests in senior floating-rate loans (Senior Loans) for which reliable market quotations are readily available are valued generally at the average mean of bid and ask quotations obtained from a third party pricing service. Other Senior Loans are valued at fair value by the investment adviser under procedures approved by the Trustees. In fair valuing a Senior Loan, the investment adviser utilizes one or more of the valuation techniques described in (i) through (iii) below to assess the likelihood that the borrower will make a full repayment of the loan underlying such Senior Loan relative to yields on other Senior Loans issued by companies of comparable credit quality. If the investment adviser believes that there is a reasonable likelihood of full repayment, the investment adviser will determine fair value using a matrix pricing approach that considers the yield on the Senior Loan. If the investment adviser believes there is not a reasonable likelihood of full repayment, the investment adviser will determine fair value using analyses that include, but are not limited to: (i) a comparison of the value of the borrower’s outstanding equity and debt to that of comparable public companies; (ii) a discounted cash flow analysis; or (iii) when the investment adviser believes it is likely that a borrower will be liquidated or sold, an analysis of the terms of such liquidation or sale. In certain cases, the investment adviser will use a combination of analytical methods to determine fair value, such as when only a portion of a borrower’s assets are likely to be sold. In conducting its assessment and analyses for purposes of determining fair value of a Senior Loan, the investment adviser will use its discretion and judgment in considering and appraising relevant factors. Fair value determinations are made by the portfolio managers of the Trust based on information available to such managers. The portfolio managers of other funds managed by the investment adviser that invest in Senior Loans may not possess the same information about a Senior Loan borrower as the portfolio managers of the Trust. At times, the fair value of a Senior Loan determined by the portfolio managers of other funds managed by the investment adviser that invest in Senior Loans may vary from the fair value of the same Senior Loan determined by the portfolio managers of the Trust. The fair value of each Senior Loan is periodically reviewed and approved by the investment adviser’s Valuation Committee and by the Trustees based upon procedures approved by the Trustees. Junior Loans (i.e., subordinated loans and second lien loans) are valued in the same manner as Senior Loans.

Debt Obligations. Debt obligations are generally valued on the basis of valuations provided by third party pricing services, as derived from such services’ pricing models. Inputs to the models may include, but are not limited to, reported trades, executable bid and ask prices, broker/dealer quotations, prices or yields of securities with similar characteristics, interest rates, anticipated prepayments, benchmark curves or information pertaining to the issuer, as well as industry and economic events. The pricing services may use a matrix approach, which considers information regarding securities with similar characteristics to determine the valuation for a security. Short-term debt obligations purchased with a remaining maturity of sixty days or less for which a valuation from a third party pricing service is not readily available may be valued at amortized cost, which approximates fair value.

Equity Securities. Equity securities listed on a U.S. securities exchange generally are valued at the last sale or closing price on the day of valuation or, if no sales took place on such date, at the mean between the closing bid and ask prices on the exchange where such securities are principally traded. Equity securities listed on the NASDAQ National Market System are valued at the NASDAQ official closing price. Unlisted or listed securities for which closing sales prices or closing quotations are not available are valued at the mean between the latest available bid and ask prices or, in the case of preferred equity securities that are not listed or traded in the over-the-counter market, by a third party pricing service that uses various techniques that consider factors including, but not limited to, prices or yields of securities with similar characteristics, benchmark yields, broker/dealer quotes, quotes of underlying common stock, issuer spreads, as well as industry and economic events.

Derivatives. Forward foreign currency exchange contracts are generally valued at the mean of the average bid and average ask prices that are reported by currency dealers to a third party pricing service at the valuation time. Such third party pricing service valuations are supplied for specific settlement periods and the Trust’s forward foreign currency exchange contracts are valued at an interpolated rate between the closest preceding and subsequent settlement period reported by the third party pricing service.

Foreign Securities and Currencies. Foreign securities and currencies are valued in U.S. dollars, based on foreign currency exchange rate quotations supplied by a third party pricing service. The pricing service uses a proprietary model to determine the exchange rate. Inputs to the model include reported trades and implied bid/ask spreads.

Affiliated Fund. The Trust may invest in Eaton Vance Cash Reserves Fund, LLC (Cash Reserves Fund), an affiliated investment company managed by Eaton Vance Management (EVM). While Cash Reserves Fund is not a registered money market mutual fund, it conducts all of its investment activities in accordance with the requirements of Rule 2a-7 under the 1940 Act. Investments in Cash Reserves Fund are valued at the closing net asset value per unit on the valuation day. Cash Reserves Fund generally values its investment securities based on available market quotations provided by a third party pricing service.

Fair Valuation. Investments for which valuations or market quotations are not readily available or are deemed unreliable are valued at fair value using methods determined in good faith by or at the direction of the Trustees of the Trust in a manner that most fairly reflects the security’s “fair value”, which is the amount that the Trust might reasonably expect to receive for the security upon its current sale in the ordinary course. Each such determination is based

23

Eaton Vance

Senior Income Trust

December 31, 2021

Notes to Financial Statements (Unaudited) — continued

on a consideration of relevant factors, which are likely to vary from one pricing context to another. These factors may include, but are not limited to, the type of security, the existence of any contractual restrictions on the security’s disposition, the price and extent of public trading in similar securities of the issuer or of comparable companies or entities, quotations or relevant information obtained from broker/dealers or other market participants, information obtained from the issuer, analysts, and/or the appropriate stock exchange (for exchange-traded securities), an analysis of the company’s or entity’s financial statements, and an evaluation of the forces that influence the issuer and the market(s) in which the security is purchased and sold.

B Investment Transactions — Investment transactions for financial statement purposes are accounted for on a trade date basis. Realized gains and losses on investments sold are determined on the basis of identified cost.

C Income — Interest income is recorded on the basis of interest accrued, adjusted for amortization of premium or accretion of discount. Fees associated with loan amendments are recognized immediately. Dividend income is recorded on the ex-dividend date for dividends received in cash and/or securities. Distributions from investment companies are recorded as dividend income, capital gains or return of capital based on the nature of the distribution.

D Federal Taxes — The Trust’s policy is to comply with the provisions of the Internal Revenue Code applicable to regulated investment companies and to distribute to shareholders each year substantially all of its net investment income, and all or substantially all of its net realized capital gains. Accordingly, no provision for federal income or excise tax is necessary.

As of December 31, 2021, the Trust had no uncertain tax positions that would require financial statement recognition, de-recognition, or disclosure. The Trust files a U.S. federal income tax return annually after its fiscal year-end, which is subject to examination by the Internal Revenue Service for a period of three years from the date of filing.

E Foreign Currency Translation — Investment valuations, other assets, and liabilities initially expressed in foreign currencies are translated each business day into U.S. dollars based upon current exchange rates. Purchases and sales of foreign investment securities and income and expenses denominated in foreign currencies are translated into U.S. dollars based upon currency exchange rates in effect on the respective dates of such transactions. Recognized gains or losses on investment transactions attributable to changes in foreign currency exchange rates are recorded for financial statement purposes as net realized gains and losses on investments. That portion of unrealized gains and losses on investments that results from fluctuations in foreign currency exchange rates is not separately disclosed.

F Unfunded Loan Commitments — The Trust may enter into certain loan agreements all or a portion of which may be unfunded. The Trust is obligated to fund these commitments at the borrower’s discretion. These commitments are disclosed in the accompanying Portfolio of Investments. At December 31, 2021, the Trust had sufficient cash and/or securities to cover these commitments.

G Use of Estimates — The preparation of the financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of income and expense during the reporting period. Actual results could differ from those estimates.

H Indemnifications — Under the Trust’s organizational documents, its officers and Trustees may be indemnified against certain liabilities and expenses arising out of the performance of their duties to the Trust. Under Massachusetts law, if certain conditions prevail, shareholders of a Massachusetts business trust (such as the Trust) could be deemed to have personal liability for the obligations of the Trust. However, the Trust’s Declaration of Trust contains an express disclaimer of liability on the part of Trust shareholders and the By-laws provide that the Trust shall assume, upon request by the shareholder, the defense on behalf of any Trust shareholders. Moreover, the By-laws also provide for indemnification out of Trust property of any shareholder held personally liable solely by reason of being or having been a shareholder for all loss or expense arising from such liability. Additionally, in the normal course of business, the Trust enters into agreements with service providers that may contain indemnification clauses. The Trust’s maximum exposure under these arrangements is unknown as this would involve future claims that may be made against the Trust that have not yet occurred.

I Forward Foreign Currency Exchange Contracts — The Trust may enter into forward foreign currency exchange contracts for the purchase or sale of a specific foreign currency at a fixed price on a future date. The forward foreign currency exchange contracts are adjusted by the daily exchange rate of the underlying currency and any gains or losses are recorded as unrealized until such time as the contracts have been closed. Risks may arise upon entering these contracts from the potential inability of counterparties to meet the terms of their contracts and from movements in the value of a foreign currency relative to the U.S. dollar.

J Interim Financial Statements — The interim financial statements relating to December 31, 2021 and for the six months then ended have not been audited by an independent registered public accounting firm, but in the opinion of the Trust’s management, reflect all adjustments, consisting only of normal recurring adjustments, necessary for the fair presentation of the financial statements.

2 Auction Preferred Shares

The Trust issued Auction Preferred Shares (APS) on July 27, 2001 in a public offering. Dividends on the APS, which accrue daily, are cumulative at rates which are reset every seven days by an auction, unless a special dividend period has been set. Series of APS are identical in all respects except for the reset dates of the dividend rates. If the APS auctions do not successfully clear, the dividend payment rate over the next period for the APS holders is set at a specified maximum applicable rate until such time as the APS auctions are successful. Auctions have not cleared since February 13, 2008 and the rate

24

Eaton Vance

Senior Income Trust

December 31, 2021

Notes to Financial Statements (Unaudited) — continued

since that date has been the maximum applicable rate (see Note 3). The maximum applicable rate on the APS is 125% of the “AA” Financial Composite Commercial Paper Rate at the date of the auction. The stated spread over the reference benchmark rate is determined based on the credit rating of the APS.

The number of APS issued and outstanding as of December 31, 2021 is as follows:

Series A 752
Series B 752

The APS are redeemable at the option of the Trust at a redemption price equal to $25,000 per share, plus accumulated and unpaid dividends, on any dividend payment date. The APS are also subject to mandatory redemption at a redemption price equal to $25,000 per share, plus accumulated and unpaid dividends, if the Trust is in default for an extended period on its asset maintenance requirements with respect to the APS. If the dividends on the APS remain unpaid in an amount equal to two full years’ dividends, the holders of the APS as a class have the right to elect a majority of the Board of Trustees. In general, the holders of the APS and the common shares have equal voting rights of one vote per share, except that the holders of the APS, as a separate class, have the right to elect at least two members of the Board of Trustees. The APS have a liquidation preference of $25,000 per share, plus accumulated and unpaid dividends. The Trust is required to maintain certain asset coverage with respect to the APS as defined in the Trust’s By-Laws and the 1940 Act. The Trust pays an annual fee up to 0.15% of the liquidation value of the APS to broker/dealers as a service fee if the auctions are unsuccessful; otherwise, the annual fee is 0.25%.

3 Distributions to Shareholders and Income Tax Information

The Trust intends to make monthly distributions of net investment income to common shareholders, after payment of any dividends on any outstanding APS. In addition, at least annually, the Trust intends to distribute all or substantially all of its net realized capital gains. Distributions to common shareholders are recorded on the ex-dividend date. Distributions to preferred shareholders are recorded daily and are payable at the end of each dividend period. The dividend rates for the APS at December 31, 2021, and the amount of dividends accrued (including capital gains, if any) to APS shareholders, average APS dividend rates (annualized), and dividend rate ranges for the six months then ended were as follows:

Series A 0.09 % Dividends Accrued to APS Shareholders — $ 8,080 0.09 % 0.06-0.10
Series B 0.10 8,610 0.09 0.06-0.10

Beginning February 13, 2008 and consistent with the patterns in the broader market for auction-rate securities, the Trust’s APS auctions were unsuccessful in clearing due to an imbalance of sell orders over bids to buy the APS. As a result, the dividend rates of the APS were reset to the maximum applicable rates. The table above reflects such maximum dividend rate for each series as of December 31, 2021.

Distributions to shareholders are determined in accordance with income tax regulations, which may differ from U.S. GAAP. As required by U.S. GAAP, only distributions in excess of tax basis earnings and profits are reported in the financial statements as a return of capital. Permanent differences between book and tax accounting relating to distributions are reclassified to paid-in capital. For tax purposes, distributions from short-term capital gains are considered to be from ordinary income.

At June 30, 2021, the Trust, for federal income tax purposes, had deferred capital losses of $19,936,705 which would reduce its taxable income arising from future net realized gains on investment transactions, if any, to the extent permitted by the Internal Revenue Code, and thus would reduce the amount of distributions to shareholders, which would otherwise be necessary to relieve the Trust of any liability for federal income or excise tax. The deferred capital losses are treated as arising on the first day of the Trust’s next taxable year and retain the same short-term or long-term character as when originally deferred. Of the deferred capital losses at June 30, 2021, $2,021,139 are short-term and $17,915,566 are long-term.

25

Eaton Vance

Senior Income Trust

December 31, 2021

Notes to Financial Statements (Unaudited) — continued

The cost and unrealized appreciation (depreciation) of investments, including open derivative contracts, of the Trust at December 31, 2021, as determined on a federal income tax basis, were as follows:

Aggregate cost $
Gross unrealized appreciation $ 1,923,952
Gross unrealized depreciation (2,874,702 )
Net unrealized depreciation $ (950,750 )

4 Investment Adviser Fee and Other Transactions with Affiliates

The investment adviser fee is earned by EVM as compensation for investment advisory services rendered to the Trust. The investment adviser fee is computed at an annual rate of 0.73% of the Trust’s average weekly gross assets and is payable monthly. The annual investment adviser fee rate shall be reduced to the following as of the stated date: May 1, 2022: 0.72%, May 1, 2023: 0.71%, May 1, 2024: 0.70%, May 1, 2025: 0.69% and May 1, 2026: 0.55%. Gross assets as referred to herein are calculated by deducting accrued liabilities of the Trust except the principal amount of any indebtedness for money borrowed, including debt securities issued by the Trust. For the six months ended December 31, 2021, the Trust’s investment adviser fee amounted to $802,291. The Trust invests its cash in Cash Reserves Fund. EVM does not currently receive a fee for advisory services provided to Cash Reserves Fund. The administration fee is earned by EVM for administering the business affairs of the Trust and is computed at an annual rate of 0.25% of the Trust’s average weekly gross assets. For the six months ended December 31, 2021, the administration fee amounted to $274,757.

Trustees and officers of the Trust who are members of EVM’s organization receive remuneration for their services to the Trust out of the investment adviser fee. Trustees of the Trust who are not affiliated with EVM may elect to defer receipt of all or a percentage of their annual fees in accordance with the terms of the Trustees Deferred Compensation Plan. For the six months ended December 31, 2021, no significant amounts have been deferred. Certain officers and Trustees of the Trust are officers of EVM.

During the six months ended December 31, 2021, EVM reimbursed the Trust $1,737 for a net realized loss due to a trading error. The amount of the reimbursement had an impact on total return on net asset value of less than 0.01%.

5 Purchases and Sales of Investments

Purchases and sales of investments, other than short-term obligations and including maturities, paydowns and principal repayments on Senior Loans, aggregated $67,990,080 and $252,157,790, respectively, for the six months ended December 31, 2021.

6 Common Shares of Beneficial Interest and Shelf Offering

The Trust may issue common shares pursuant to its dividend reinvestment plan. Common shares issued by the Trust pursuant to its dividend reinvestment plan for the six months ended December 31, 2021 were 2,542. There were no common shares issued by the Trust for the year ended June 30, 2021.

As announced on May 12, 2021, the Trust’s Board of Trustees authorized an initial conditional cash tender offer (the “Initial Tender Offer”) by the Trust for up to 60% of its outstanding common shares at a price per share equal to 99% of the Trust’s net asset value (“NAV”) per share as of the close of regular trading on the New York Stock Exchange on the date the tender offer expires. On June 29, 2021, the Trust commenced a cash tender offer for up to 22,719,965 of its outstanding common shares. The tender offer expired at 5:00 P.M. Eastern Time on July 30, 2021. The number of shares properly tendered was 20,330,291.438. The purchase price of the properly tendered shares was equal to $6.7897 per share for an aggregate purchase price of $138,036,580.

In addition to the Initial Tender Offer, the Trust announced on May 12, 2021 that it will conduct cash tender offers in the fourth quarter of each of 2022, 2023 and 2024 (each, a “Conditional Tender Offer”) for up to 10% of the Trust’s then-outstanding common shares if, from January to August of the relevant year, the Trust’s shares trade at an average daily discount to NAV of more than 10%, based upon the Trust’s volume-weighted average market price and NAV on each business day during the period. If triggered, common shares tendered and accepted in a Conditional Tender Offer would be repurchased at a price per share equal to 98% of the Trust’s NAV as of the close of regular trading on the New York Stock Exchange on the date such Conditional Tender Offer expires.

In November 2013, the Board of Trustees initially approved a share repurchase program for the Trust. Pursuant to the reauthorization of the share repurchase program by the Board of Trustees in March 2019, the Trust is authorized to repurchase up to 10% of its common shares outstanding as of the last day of the prior calendar year at market prices when shares are trading at a discount to net asset value. The share repurchase program does not obligate the Trust to purchase a specific amount of shares. There were no repurchases of common shares by the Trust for the six months ended December 31, 2021 and the year ended June 30, 2021.

26

Eaton Vance

Senior Income Trust

December 31, 2021

Notes to Financial Statements (Unaudited) — continued

Pursuant to a registration statement filed with the SEC, the Trust is authorized to issue up to an additional 4,551,438 common shares through an equity shelf offering program (the “shelf offering”). Under the shelf offering, the Trust, subject to market conditions, may raise additional capital from time to time and in varying amounts and offering methods at a net price at or above the Trust’s net asset value per common share. During the six months ended December 31, 2021 and the year ended June 30, 2021, there were no shares sold by the Trust pursuant to its shelf offering.

According to filings made on Schedule 13D and 13G pursuant to Sections 13(d) and 13(g) of the Securities Exchange Act of 1934, as amended, three affiliated entities together owned 10.6% of the Trust’s common shares.

7 Restricted Securities

At December 31, 2021, the Trust owned the following securities which were restricted as to public resale and not registered under the Securities Act of 1933 (excluding Rule 144A securities). The Trust has various registration rights (exercisable under a variety of circumstances) with respect to these securities. The value of these securities is determined based on valuations provided by brokers when available, or if not available, they are valued at fair value using methods determined in good faith by or at the direction of the Trustees.

Description Cost Value
Common Stocks
Nine Point Energy Holdings, Inc. 7/15/14 325 $ 15,070 $ 0
Convertible Preferred Stocks
Nine Point Energy Holdings, Inc., Series A, 12.00% (PIK) 5/26/17 5 5,000 0
Total Restricted Securities $ 20,070 $ 0

8 Financial Instruments

The Trust may trade in financial instruments with off-balance sheet risk in the normal course of its investing activities. These financial instruments may include forward foreign currency exchange contracts and may involve, to a varying degree, elements of risk in excess of the amounts recognized for financial statement purposes. The notional or contractual amounts of these instruments represent the investment the Trust has in particular classes of financial instruments and do not necessarily represent the amounts potentially subject to risk. The measurement of the risks associated with these instruments is meaningful only when all related and offsetting transactions are considered. A summary of obligations under these financial instruments at December 31, 2021 is included in the Portfolio of Investments. At December 31, 2021, the Trust had sufficient cash and/or securities to cover commitments under these contracts.

The Trust is subject to foreign exchange risk in the normal course of pursuing its investment objective. Because the Trust holds foreign currency denominated investments, the value of these investments and related receivables and payables may change due to future changes in foreign currency exchange rates. To hedge against this risk, the Trust enters into forward foreign currency exchange contracts.

The Trust enters into forward foreign currency exchange contracts that may contain provisions whereby the counterparty may terminate the contract under certain conditions, including but not limited to a decline in the Trust’s net assets below a certain level over a certain period of time, which would trigger a payment by the Trust for those derivatives in a liability position. At December 31, 2021, the fair value of derivatives with credit-related contingent features in a net liability position was $143,462. At December 31, 2021, there were no assets pledged by the Trust for such liability.

The over-the-counter (OTC) derivatives in which the Trust invests are subject to the risk that the counterparty to the contract fails to perform its obligations under the contract. To mitigate this risk, the Trust has entered into an International Swaps and Derivatives Association, Inc. Master Agreement (“ISDA Master Agreement”) or similar agreement with substantially all its derivative counterparties. An ISDA Master Agreement is a bilateral agreement between the Trust and a counterparty that governs certain OTC derivatives and typically contains, among other things, set-off provisions in the event of a default and/or termination event as defined under the relevant ISDA Master Agreement. Under an ISDA Master Agreement, the Trust may, under certain circumstances, offset with the counterparty certain derivative financial instruments’ payables and/or receivables with collateral held and/or posted and create one single net payment. The provisions of the ISDA Master Agreement typically permit a single net payment in the event of default including the bankruptcy or insolvency of the counterparty. However, bankruptcy or insolvency laws of a particular jurisdiction may impose restrictions on or prohibitions against the right of offset in bankruptcy or insolvency. Certain ISDA Master Agreements allow counterparties to OTC derivatives to terminate derivative contracts prior to maturity in the event the Trust’s net assets decline by a stated percentage or the Trust fails to meet the terms of its ISDA Master Agreements, which would cause the counterparty to accelerate payment by the Trust of any net liability owed to it.

27

Eaton Vance

Senior Income Trust

December 31, 2021

Notes to Financial Statements (Unaudited) — continued

The collateral requirements for derivatives traded under an ISDA Master Agreement are governed by a Credit Support Annex to the ISDA Master Agreement. Collateral requirements are determined at the close of business each day and are typically based on changes in market values for each transaction under an ISDA Master Agreement and netted into one amount for such agreement. Generally, the amount of collateral due from or to a counterparty is subject to a minimum transfer threshold amount before a transfer is required, which may vary by counterparty. Collateral pledged for the benefit of the Trust and/or counterparty is held in segregated accounts by the Trust’s custodian and cannot be sold, re-pledged, assigned or otherwise used while pledged. The portion of such collateral representing cash, if any, is reflected as deposits for derivatives collateral and, in the case of cash pledged by a counterparty for the benefit of the Trust, a corresponding liability on the Statement of Assets and Liabilities. Securities pledged by the Trust as collateral, if any, are identified as such in the Portfolio of Investments.

The fair value of open derivative instruments (not considered to be hedging instruments for accounting disclosure purposes) and whose primary underlying risk exposure is foreign exchange risk at December 31, 2021 was as follows:

Derivative Fair Value — Asset Derivative (1) Liability Derivative (2)
Forward foreign currency exchange contracts $ 44,786 $ (143,462 )

(1) Statement of Assets and Liabilities location: Receivable for open forward foreign currency exchange contracts.

(2) Statement of Assets and Liabilities location: Payable for open forward foreign currency exchange contracts.

The Trust’s derivative assets and liabilities at fair value by type, which are reported gross in the Statement of Assets and Liabilities, are presented in the table above. The following tables present the Trust’s derivative assets and liabilities by counterparty, net of amounts available for offset under a master netting agreement and net of the related collateral received by the Trust for such assets and pledged by the Trust for such liabilities as of December 31, 2021.

Counterparty Derivative Assets Subject to Master Netting Agreement Derivatives Available for Offset Non-cash Collateral Received (a) Cash Collateral Received (a) Net Amount of Derivative Assets (b)
HSBC Bank USA, N.A. $ 153 $ (153 ) $ — $ — $ —
JPMorgan Chase Bank, N.A. 3,353 (3,347 ) — — 6
Standard Chartered Bank 5,055 (5,055 ) — — —
State Street Bank and Trust Company 36,225 (36,225 ) — — —
$ 44,786 $ (44,780 ) $ — $ — $ 6
Counterparty Derivative Liabilities Subject to Master Netting Agreement Derivatives Available for Offset Non-cash Collateral Pledged (a) Cash Collateral Pledged (a) Net Amount of Derivative Liabilities (c)
HSBC Bank USA, N.A. $ (1,050 ) $ 153 $ — $ — $ (897 )
JPMorgan Chase Bank, N.A. (3,347 ) 3,347 — — —
Standard Chartered Bank (87,288 ) 5,055 — — (82,233 )
State Street Bank and Trust Company (51,777 ) 36,225 — — (15,552 )
$ (1,43,462 ) $ 44,780 $ — $ — $ (98,682 )

(a) In some instances, the total collateral received and/or pledged may be more than the amount shown due to overcollateralization.

(b) Net amount represents the net amount due from the counterparty in the event of default.

(c) Net amount represents the net amount payable to the counterparty in the event of default.

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Eaton Vance

Senior Income Trust

December 31, 2021

Notes to Financial Statements (Unaudited) — continued

The effect of derivative instruments (not considered to be hedging instruments for accounting disclosure purposes) on the Statement of Operations and whose primary underlying risk exposure is foreign exchange risk for the six months ended December 31, 2021 was as follows:

Derivative Realized Gain (Loss) on Derivatives Recognized in Income (1) Change in Unrealized Appreciation (Depreciation) on Derivatives Recognized in Income (2)
Forward foreign currency exchange contracts $ 1,339,867 $ (697,144 )

(1) Statement of Operations location: Net realized gain (loss) – Forward foreign currency exchange contracts.

(2) Statement of Operations location: Change in unrealized appreciation (depreciation) – Forward foreign currency exchange contracts.

The average notional amount of forward foreign currency exchange contracts (based on the absolute value of notional amounts of currency purchased and currency sold) outstanding during the six months ended December 31, 2021, which is indicative of the volume of this derivative type, was approximately $27,957,000.

9 Revolving Credit and Security Agreement

The Trust has entered into a Revolving Credit and Security Agreement, as amended (the Agreement) with conduit lenders and a bank to borrow up to $50 million ($125 million prior to September 29, 2021). Borrowings under the Agreement are secured by the assets of the Trust. Interest is charged at a rate above the conduits’ commercial paper issuance rate and is payable monthly. Under the terms of the Agreement, in effect through March 7, 2022, the Trust also pays a program fee of 0.90% per annum on its outstanding borrowings to administer the facility and a liquidity fee of 0.15% (0.25% if the outstanding loan amount is less than or equal to 60% of the total facility size) per annum on the unused portion of the total commitment under the Agreement. Program and liquidity fees for the six months ended December 31, 2021 totaled $209,445 and are included in interest expense and fees on the Statement of Operations. In connection with the renewal of the Agreement on March 8, 2021, the Trust paid upfront fees of $187,500, which is being amortized to interest expense over a period of one year through March 7, 2022. The unamortized balance at December 31, 2021 is approximately $34,000 and is included in prepaid upfront fees on notes payable on the Statement of Assets and Liabilities. At December 31, 2021, the Trust had borrowings outstanding under the Agreement of $25,000,000 at an annual interest rate of 0.14%. Based on the short-term nature of the borrowings under the Agreement and the variable interest rate, the carrying amount of the borrowings at December 31, 2021 approximated its fair value. If measured at fair value, borrowings under the Agreement would have been considered as Level 2 in the fair value hierarchy (see Note 11) at December 31, 2021. For the six months ended December 31, 2021, the average borrowings under the Agreement and the average annual interest rate (excluding fees) were $28,733,696 and 0.14%, respectively.

10 Investments in Affiliated Funds

At December 31, 2021, the value of the Trust’s investment in affiliated funds was $8,079,350, which represents 6.7% of the Trust’s net assets. Transactions in affiliated funds by the Trust for the six months ended December 31, 2021 were as follows:

Name Value, beginning of period Purchases Sales proceeds Net realized gain (loss) Change in unrealized appreciation (depreciation) Value, end of period Dividend income
Short-Term Investments
Eaton Vance Cash Reserves Fund, LLC $ 5,030,292 $ 209,361,802 $ (206,312,435 ) $ (237 ) $ (72 ) $ 8,079,350 $ 5,634 8,080,158

11 Fair Value Measurements

Under generally accepted accounting principles for fair value measurements, a three-tier hierarchy to prioritize the assumptions, referred to as inputs, is used in valuation techniques to measure fair value. The three-tier hierarchy of inputs is summarized in the three broad levels listed below.

• Level 1 – quoted prices in active markets for identical investments

• Level 2 – other significant observable inputs (including quoted prices for similar investments, interest rates, prepayment speeds, credit risk, etc.)

• Level 3 – significant unobservable inputs (including a fund’s own assumptions in determining the fair value of investments)

29

Eaton Vance

Senior Income Trust

December 31, 2021

Notes to Financial Statements (Unaudited) — continued

In cases where the inputs used to measure fair value fall in different levels of the fair value hierarchy, the level disclosed is determined based on the lowest level input that is significant to the fair value measurement in its entirety. The inputs or methodology used for valuing securities are not necessarily an indication of the risk associated with investing in those securities.

At December 31, 2021, the hierarchy of inputs used in valuing the Trust’s investments and open derivative instruments, which are carried at value, were as follows:

Asset Description Level 1 Level 2 Level 3* Total
Asset-Backed Securities $ — $ 13,467,672 $ — $ 13,467,672
Closed-End Funds 3,869,689 — — 3,869,689
Common Stocks 963,656 988,931 703,261 2,655,848
Convertible Preferred Stocks — 622 0 622
Corporate Bonds — 2,542,941 — 2,542,941
Senior Floating-Rate Loans (Less Unfunded Loan Commitments) — 159,265,655 207,098 159,472,753
Warrants — 0 0 0
Miscellaneous — — 0 0
Short-Term Investments — 8,079,350 — 8,079,350
Total Investments $ 4,833,345 $ 184,345,171 $ 910,359 $ 190,088,875
Forward Foreign Currency Exchange Contracts $ — $ 44,786 $ — $ 44,786
Total $ 4,833,345 $ 184,389,957 $ 910,359 $ 190,133,661
Liability Description
Forward Foreign Currency Exchange Contracts $ — $ (143,462 ) $ — $ (143,462 )
Total $ — $ (143,462 ) $ — $ (143,462 )
  • None of the unobservable inputs for Level 3 assets, individually or collectively, had a material impact on the Trust.

Level 3 investments at the beginning and/or end of the period in relation to net assets were not significant and accordingly, a reconciliation of Level 3 assets for the six months ended December 31, 2021 is not presented.

12 Risks and Uncertainties

Risks Associated with Foreign Investments

Foreign investments can be adversely affected by political, economic and market developments abroad, including the imposition of economic and other sanctions by the United States or another country. There may be less publicly available information about foreign issuers because they may not be subject to reporting practices, requirements or regulations comparable to those to which United States companies are subject. Foreign markets may be smaller, less liquid and more volatile than the major markets in the United States. Trading in foreign markets typically involves higher expense than trading in the United States. The Trust may have difficulties enforcing its legal or contractual rights in a foreign country. Securities that trade or are denominated in currencies other than the U.S. dollar may be adversely affected by fluctuations in currency exchange rates.

Credit Risk

The Trust invests primarily in below investment grade floating-rate loans, which are considered speculative because of the credit risk of their issuers. Changes in economic conditions or other circumstances are more likely to reduce the capacity of issuers of these securities to make principal and interest payments. Such companies are more likely to default on their payments of interest and principal owed than issuers of investment grade bonds. An economic downturn generally leads to a higher non-payment rate, and a loan or other debt obligation may lose significant value before a default occurs. Lower rated investments also may be subject to greater price volatility than higher rated investments. Moreover, the specific collateral used to secure a loan may decline in value or become illiquid, which would adversely affect the loan’s value.

LIBOR Transition Risk

Certain instruments held by the Trust may pay an interest rate based on the London Interbank Offered Rate (“LIBOR”), which is the average offered rate for various maturities of short-term loans between certain major international banks. LIBOR is used throughout global banking and financial industries to determine interest rates for a variety of financial instruments (such as debt instruments and derivatives) and borrowing arrangements. The ICE Benchmark

30

Eaton Vance

Senior Income Trust

December 31, 2021

Notes to Financial Statements (Unaudited) — continued

Administration Limited, the administrator of LIBOR, ceased publishing certain LIBOR settings on December 31, 2021, and is expected to cease publishing the remaining LIBOR settings on June 30, 2023. Although the transition process away from LIBOR has become increasingly well-defined, the impact on certain debt securities, derivatives and other financial instruments that utilize LIBOR remains uncertain. The phase-out of LIBOR may result in, among other things, increased volatility or illiquidity in markets for instruments based on LIBOR and changes in the value of such instruments.

Pandemic Risk

An outbreak of respiratory disease caused by a novel coronavirus was first detected in China in late 2019 and subsequently spread internationally. This coronavirus has resulted in closing borders, enhanced health screenings, changes to healthcare service preparation and delivery, quarantines, cancellations, disruptions to supply chains and customer activity, as well as general concern and uncertainty. Health crises caused by outbreaks, such as the coronavirus outbreak, may exacerbate other pre-existing political, social and economic risks and disrupt normal market conditions and operations. The impact of this outbreak has negatively affected the worldwide economy, the economies of individual countries, individual companies, and the market in general, and may continue to do so in significant and unforeseen ways, as may other epidemics and pandemics that may arise in the future. Any such impact could adversely affect the Trust’s performance, or the performance of the securities in which the Trust invests.

13 Additional Information

On August 27, 2020, Saba Capital Master Fund, Ltd., a hedge fund (“Saba”), filed claims against the Trust in a lawsuit in Suffolk County Superior Court in Massachusetts asserting breach of contract and fiduciary duty by the Trust and certain of its affiliates, the Trust’s adviser, and the Board, following the implementation by the Trust of by-law amendments that (i) require trustee nominees in contested elections to obtain affirmative votes of a majority of eligible shares in order to be elected and (ii) establish certain requirements related to shares obtained in “control share” acquisitions. With respect to the Trust, Saba seeks rescission of these by-law provisions and certain related relief. On March 31, 2021, the court allowed in part and denied in part a motion to dismiss Saba’s claims.

31

Eaton Vance

Senior Income Trust

December 31, 2021

Annual Meeting of Shareholders (Unaudited)

The Trust held its Annual Meeting of Shareholders (the “Annual Meeting”) on October 14, 2021. In order to allow shareholders more time to vote, the Annual Meeting was adjourned to October 29, 2021. The following action was taken by the shareholders.

Proposal 1a: The election of Mark R. Fetting, Helen Frame Peters, Keith Quinton and Scott E. Wennerholm as Class II Trustees of the Trust, each for a three-year term ending in 2024.

The following vote was cast by the Trust’s common and APS shareholders, voting together as a single class:

Nominees for Trustee 1 Number of Shares — For Withheld
Mark R. Fetting 13,266,195 14,314,666
Helen Frame Peters 13,253,987 14,326,874
Keith Quinton 13,265,777 14,315,084
Scott E. Wennerholm 13,266,040 14,314,821

1 Pursuant to the Trust’s Declaration of Trust and Amended and Restated By-Laws, Messrs. Fetting, Quinton and Wennerholm and Ms. Peters were each elected at the Annual Meeting.

32

Eaton Vance

Senior Income Trust

December 31, 2021

Officers and Trustees

Officers

Eric A. Stein

President

Deidre E. Walsh

Vice President and Chief Legal Officer

Jill R. Damon

Secretary

James F. Kirchner

Treasurer

Richard F. Froio

Chief Compliance Officer

Trustees

George J. Gorman

Chairperson

Thomas E. Faust Jr.*

Mark R. Fetting

Cynthia E. Frost

Valerie A. Mosley

William H. Park

Helen Frame Peters

Keith Quinton

Marcus L. Smith

Susan J. Sutherland

Scott E. Wennerholm

  • Interested Trustee

33

Eaton Vance Funds

Privacy Notice April 2021

FACTS WHAT DOES EATON VANCE DO WITH YOUR PERSONAL INFORMATION?
Why? Financial companies choose how they share your personal information. Federal law gives consumers the right to limit some but not all
sharing. Federal law also requires us to tell you how we collect, share, and protect your personal information. Please read this notice carefully to understand what we do.
What? The types of personal information we collect and
share depend on the product or service you have with us. This information can include: ∎ Social
Security number and income ∎ investment
experience and risk tolerance ∎ checking
account number and wire transfer instructions
How? All financial companies need to share customers’ personal information to run their everyday business. In the section below, we
list the reasons financial companies can share their customers’ personal information; the reasons Eaton Vance chooses to share; and whether you can limit this sharing.

| Reasons we can share your personal information | Does Eaton Vance share? | Can you limit this
sharing? |
| --- | --- | --- |
| For our everyday business purposes — such as to process your transactions, maintain
your account(s), respond to court orders and legal investigations, or report to credit bureaus | Yes | No |
| For our marketing purposes — to offer our products and services to you | Yes | No |
| For joint marketing with other financial companies | No | We don’t share |
| For our investment management affiliates’ everyday business purposes — information
about your transactions, experiences, and creditworthiness | Yes | Yes |
| For our affiliates’ everyday business purposes — information about your
transactions and experiences | Yes | No |
| For our affiliates’ everyday business purposes — information about your
creditworthiness | No | We don’t share |
| For our investment management affiliates to market to you | Yes | Yes |
| For our affiliates to market to you | No | We don’t share |
| For nonaffiliates to market to you | No | We don’t share |

| To limit our
sharing | Call toll-free 1-800-262-1122 or email: [email protected] Please note: If you are a new customer, we can begin sharing your information 30 days from the date we sent this notice. When you are no longer our customer, we
continue to share your information as described in this notice. However, you can contact us at any time to limit our sharing. |
| --- | --- |
| Questions? | Call toll-free 1-800-262-1122 or email:
[email protected] |

34

Eaton Vance Funds

Privacy Notice — continued April 2021

Page 2

Who we are
Who is providing this notice? Eaton Vance Management, Eaton Vance Distributors, Inc., Eaton Vance Trust Company, Eaton Vance Management (International) Limited,
Eaton Vance Advisers International Ltd., Eaton Vance Global Advisors Limited, Eaton Vance Management’s Real Estate Investment Group, Boston Management and Research, Calvert Research and Management, Eaton Vance and Calvert Fund Families and our
investment advisory affiliates (“Eaton Vance”) (see Investment Management Affiliates definition below)
What we do
How does Eaton Vance protect my personal information? To protect your personal information from unauthorized access and use, we use security measures that comply with federal law. These
measures include computer safeguards and secured files and buildings. We have policies governing the proper handling of customer information by personnel and requiring third parties that provide support to adhere to appropriate security standards
with respect to such information.
How does Eaton Vance collect my personal information? We collect your personal information, for example,
when you ∎ open an account or make deposits or withdrawals from your account ∎ buy
securities from us or make a wire transfer ∎ give us your contact information We also collect your personal information from others, such as credit bureaus, affiliates, or other companies.
Why can’t I limit all sharing? Federal law gives you the right to limit only ∎ sharing for affiliates’ everyday business purposes — information about your creditworthiness ∎ affiliates
from using your information to market to you ∎ sharing for nonaffiliates to market to you State laws and individual companies may give you additional rights to limit sharing. See below for more on your rights under state law.
Definitions
Investment Management Affiliates Eaton Vance Investment Management Affiliates include registered investment advisers, registered broker-dealers, and registered and
unregistered funds. Investment Management Affiliates does not include entities associated with Morgan Stanley Wealth Management, such as Morgan Stanley Smith Barney LLC and Morgan Stanley & Co.
Affiliates Companies related by common ownership or control.
They can be financial and nonfinancial companies. ∎ Our
affiliates include companies with a Morgan Stanley name and financial companies such as Morgan Stanley Smith Barney LLC and Morgan Stanley & Co.
Nonaffiliates Companies not related by common ownership or
control. They can be financial and nonfinancial companies. ∎ Eaton
Vance does not share with nonaffiliates so they can market to you.
Joint marketing A formal agreement between nonaffiliated financial
companies that together market financial products or services to you. ∎ Eaton
Vance doesn’t jointly market.
Other important information
Vermont: Except as permitted by law, we will not share personal information we collect about Vermont residents with Nonaffiliates unless you provide us with your
written consent to share such information. California: Except as permitted by law, we
will not share personal information we collect about California residents with Nonaffiliates and we will limit sharing such personal information with our Affiliates to comply with California privacy laws that apply to us.

35

Eaton Vance Funds

IMPORTANT NOTICES

Delivery of Shareholder Documents. The Securities and Exchange Commission (SEC) permits funds to deliver only one copy of shareholder documents, including prospectuses, proxy statements and shareholder reports, to fund investors with multiple accounts at the same residential or post office box address. This practice is often called “householding” and it helps eliminate duplicate mailings to shareholders. American Stock Transfer & Trust Company, LLC (“AST”), the closed-end funds transfer agent, or your financial intermediary, may household the mailing of your documents indefinitely unless you instruct AST, or your financial intermediary, otherwise. If you would prefer that your Eaton Vance documents not be householded, please contact AST or your financial intermediary. Your instructions that householding not apply to delivery of your Eaton Vance documents will typically be effective within 30 days of receipt by AST or your financial intermediary.

Portfolio Holdings . Each Eaton Vance Fund and its underlying Portfolio(s) (if applicable) files a schedule of portfolio holdings on Part F to Form N-PORT with the SEC. Certain information filed on Form N-PORT may be viewed on the Eaton Vance website at www.eatonvance.com, by calling Eaton Vance at 1-800-262-1122 or in the EDGAR database on the SEC’s website at www.sec.gov.

Proxy Voting . From time to time, funds are required to vote proxies related to the securities held by the funds. The Eaton Vance Funds or their underlying Portfolios (if applicable) vote proxies according to a set of policies and procedures approved by the Funds’ and Portfolios’ Boards. You may obtain a description of these policies and procedures and information on how the Funds or Portfolios voted proxies relating to portfolio securities during the most recent 12-month period ended June 30, without charge, upon request, by calling 1-800-262-1122 and by accessing the SEC’s website at www.sec.gov.

Share Repurchase Program . The Fund’s Board of Trustees has approved a share repurchase program authorizing the Fund to repurchase up to 10% of its common shares outstanding as of the last day of the prior calendar year in open-market transactions at a discount to net asset value. The repurchase program does not obligate the Fund to purchase a specific amount of shares. The Fund’s repurchase activity, including the number of shares purchased, average price and average discount to net asset value, is disclosed in the Fund’s annual and semi-annual reports to shareholders.

Additional Notice to Shareholders . If applicable, a Fund may also redeem or purchase its outstanding preferred shares in order to maintain compliance with regulatory requirements, borrowing or rating agency requirements or for other purposes as it deems appropriate or necessary.

Closed-End Fund Information . Eaton Vance closed-end funds make fund performance data and certain information about portfolio characteristics available on the Eaton Vance website shortly after the end of each month. Other information about the funds is available on the website. The funds’ net asset value per share is readily accessible on the Eaton Vance website. Portfolio holdings for the most recent month-end are also posted to the website approximately 30 days following the end of the month. This information is available at www.eatonvance.com on the fund information pages under “Closed-End Funds and Term Trusts”.

36

Investment Adviser and Administrator

Eaton Vance Management

Two International Place

Boston, MA 02110

Custodian

State Street Bank and Trust Company

State Street Financial Center, One Lincoln Street

Boston, MA 02111

Transfer Agent

American Stock Transfer & Trust Company, LLC

6201 15 th Avenue

Brooklyn, NY 11219

Fund Offices

Two International Place

Boston, MA 02110

7700 12.31.21

Item 2. Code of Ethics

Not required in this filing.

Item 3. Audit Committee Financial Expert

Not required in this filing.

Item 4. Principal Accountant Fees and Services

Not required in this filing.

Item 5. Audit Committee of Listed Registrants

Not required in this filing.

Item 6. Schedule of Investments

Please see schedule of investments contained in the Report to Stockholders included under Item 1 of this Form N-CSR.

Item 7. Disclosure of Proxy Voting Policies and Procedures for Closed-End Management Investment Companies

Not required in this filing.

Item 8. Portfolio Managers of Closed-End Management Investment Companies

Not required in this filing.

Item 9. Purchases of Equity Securities by Closed-End Management Investment Company and Affiliated Purchasers

No such purchases this period.

Item 10. Submission of Matters to a Vote of Security Holders

No material changes.

Item 11. Controls and Procedures

(a) It is the conclusion of the registrant’s principal executive officer and principal financial officer that the effectiveness of the registrant’s current disclosure controls and procedures (such disclosure controls and procedures having been evaluated within 90 days of the date of this filing) provide reasonable assurance that the information required to be disclosed by the registrant has been recorded, processed, summarized and reported within the time period specified in the Commission’s rules and forms and that the information required to be disclosed by the registrant has been accumulated and communicated to the registrant’s principal executive officer and principal financial officer in order to allow timely decisions regarding required disclosure.

(b) There have been no changes in the registrant’s internal controls over financial reporting during the period covered by this report that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting.

Item 12. Disclosure of Securities Lending Activities for Closed-End Management Investment Companies

No activity to report for the registrant’s most recent fiscal year end.

Item 13. Exhibits

(a)(1) Registrant’s Code of Ethics – Not applicable (please see Item 2).
(a)(2)(i) Treasurer’s Section 302 certification.
(a)(2)(ii) President’s Section 302 certification.
(b) Combined Section 906 certification.

Signatures

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Eaton Vance Senior Income Trust
By: /s/ Eric A. Stein
Eric A. Stein
President

Date: February 23, 2022

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

By:
James F. Kirchner
Treasurer

Date: February 23, 2022

By:
Eric A. Stein
President

Date: February 23, 2022

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