Cabaletta Bio, Inc. — Major Shareholding Notification 2022

Oct 31, 2022

SC 13G 1 p22-2377sc13g.htm CABALETTA BIO, INC

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
Under the Securities Exchange Act of 1934
(Amendment No. )*
Cabaletta Bio, Inc.
(Name of Issuer)
Common Stock, $0.00001
par value per share
(Title of Class of Securities)
12674W109
(CUSIP Number)
October 20, 2022
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
¨	Rule 13d-1(b)
x	Rule 13d-1(c)
¨	Rule 13d-1(d)
(Page 1 of 8 Pages)

---

*The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 (" Act ") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

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CUSIP No. 12674W109 13G Page 2 of 8 Pages

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1	NAME OF REPORTING PERSON Lynx1 Capital Management LP
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP	(a) ¨ (b) ¨
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	5	SOLE VOTING POWER 0
	6	SHARED VOTING POWER 2,360,312
	7	SOLE DISPOSITIVE POWER 0
	8	SHARED DISPOSITIVE POWER 2,360,312
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,360,312
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES	¨
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 8.14%
12	TYPE OF REPORTING PERSON PN

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CUSIP No. 12674W109 13G Page 3 of 8 Pages

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1	NAME OF REPORTING PERSON Weston Nichols
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP	(a) ¨ (b) ¨
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION United States of America
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH	5	SOLE VOTING POWER 0
	6	SHARED VOTING POWER 2,360,312
	7	SOLE DISPOSITIVE POWER 0
	8	SHARED DISPOSITIVE POWER 2,360,312
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 2,360,312
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES	¨
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 8.14%
12	TYPE OF REPORTING PERSON IN

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CUSIP No. 12674W109 13G Page 4 of 8 Pages

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Item 1(a).
Cabaletta Bio, Inc. (the " Issuer ")

Item 1(b).
2929 Arch Street, Suite 600 Philadelphia, PA 19104

Item 2(a).
This statement is filed by:

| (i) | Lynx1 Capital Management LP (the " Investment
Manager "), a Delaware limited partnership, and the investment manager to Lynx1 Master Fund LP (the " Lynx1 Fund "),
with respect to the shares of Common Stock (as defined in Item 2(d) below) directly held by the Lynx1 Fund; and |
| --- | --- |
| (ii) | Mr. Weston Nichols (" Mr. Nichols "), the sole member of Lynx1 Capital Management GP LLC, the general partner of the Investment Manager, with respect to the shares of Common Stock directly held by the Lynx1 Fund. |

The foregoing persons are hereinafter sometimes collectively referred to as the " Reporting Persons ."
The filing of this statement should not be construed as an admission that any of the foregoing persons or any Reporting Person is, for the purposes of Section 13 of the Act, the beneficial owner of the shares of Common Stock reported herein.

Item 2(b).
Lynx1 Capital Management LP 151 Calle de San Francisco Suite 200, PMB 1237 San Juan, PR 00901-1607 Weston Nichols c/o Lynx1 Capital Management LP 151 Calle de San Francisco Suite 200, PMB 1237 San Juan, PR 00901-1607

Item 2(c).
Investment Manager – Delaware Mr. Nichols – United States of America

Item 2(d).
Common stock, $0.00001 par value per share (the " Common Stock ")

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CUSIP No. 12674W109 13G Page 5 of 8 Pages

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Item 2(e).
12674W109

ITEM 3. If this Statement is Filed Pursuant to §§ 240.13d-1(b) or 240.13d-2(b), or (c), check whether the Person Filing is a:

(a)	¨	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	¨	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	¨	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	¨	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	¨	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	¨	An employee benefit plan or endowment fund in accordance
with § 240.13d-1(b)(1)(ii)(F);
(g)	o	A parent holding company or control person in accordance
with §240.13d-1(b)(1)(ii)(G);
(h)	¨	A savings association as defined in Section 3(b) of the
Federal Deposit Insurance Act (12 U.S.C.1813);
(i)	¨	A church plan that is excluded from the definition of an investment company
under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	¨	A non-U.S. institution in accordance with §240.13d-1(b)(1)(ii)(J);
(k)	¨	Group, in accordance with §240.13d-1(b)(1)(ii)(K).

If filing as a non-U.S. institution in accordance with Rule 13d-1(b)(1)(ii)(J), please specify the type of institution:__________

| Item 4. |
| --- |
| The information required by Items
4(a) – (c) is set forth in Rows (5) – (11) of the cover page for each Reporting Person hereto and is incorporated herein by
reference for each Reporting Person. The percentages set forth herein
are calculated based upon 29,013,995 shares of Common Stock outstanding as of August 5, 2022 as reported in the Issuer's Quarterly Report
on Form 10-Q for the quarter ended June 30, 2022, filed with the Securities and Exchange Commission on August 11, 2022. |

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CUSIP No. 12674W109 13G Page 6 of 8 Pages

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Item 5.
Not applicable.

Item 6.
The Lynx1 Fund has the right to receive and the power to direct the receipt of dividends from, and the proceeds from the sale of, the shares of Common Stock reported herein.

Item 7.
Not applicable.

Item 8.
Not applicable.

Item 9.
Not applicable.

Item 10.
By signing below each Reporting Person certifies that, to the best of his or its knowledge and belief, the securities referred to above were not acquired for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.

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CUSIP No. 12674W109 13G Page 7 of 8 Pages

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SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, each of the undersigned certifies that the information set forth in this statement is true, complete and correct.

Date: October 31, 2022
Lynx1 capital management lp By: Lynx1 Capital Management GP LLC, its general partner
By: /s/ Weston Nichols
Name: Weston Nichols
Title: Sole Member
/s/ Weston Nichols
WESTON NICHOLS

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CUSIP No. 12674W109 13G Page 8 of 8 Pages

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Exhibit A

JOINT FILING AGREEMENT

The undersigned acknowledge and agree that the foregoing statement on Schedule 13G is filed on behalf of each of the undersigned and that all subsequent amendments to this statement on Schedule 13G shall be filed on behalf of each of the undersigned without the necessity of filing additional joint filing agreements. The undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning him or it contained herein and therein, but shall not be responsible for the completeness and accuracy of the information concerning the others, except to the extent that he or it knows or has reason to believe that such information is inaccurate.

Date: October 31, 2022
Lynx1 capital management lp By: Lynx1 Capital Management GP LLC, its general partner
By: /s/ Weston Nichols
Name: Weston Nichols
Title: Sole Member
/s/ Weston Nichols
WESTON NICHOLS