IRON MOUNTAIN INC — Director's Dealing 2021

May 12, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: IRON MOUNTAIN INC (IRM)
CIK: 0001020569
Period of Report: 2021-05-10

Reporting Person: Cloutier Ernest W (EVP & GM, RIM)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-05-10	Common Stock, par value $.01 per share	S	10000	$41.9947	Disposed	75097	Direct
2021-05-10	Common Stock, par value $.01 per share	M	34199	$37	Acquired	109296	Direct
2021-05-10	Common Stock, par value $.01 per share	S	34199	$41.981	Disposed	75097	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-05-10	Employee Stock Option (Right to Buy)	$37.0	M	34199	Disposed	2027-02-16	Common Stock (34199.0)	Direct

Footnotes

F1: This transaction was effected pursuant to a 10b5-1 trading plan which was approved and became effective March 1, 2021.

F2: The price reported in Column 4 is a weighted average price. These shares of Iron Mountain Incorporated common stock ("Common Stock") were sold in multiple transactions at prices ranging from $41.95 to $42.07, inclusive. The Reporting Person undertakes to provide Iron Mountain Incorporated (the "Company"), any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the ranges set forth in this footnote (2).

F3: The price reported in Column 4 is a weighted average price. These shares of Common Stock were sold in multiple transactions at prices ranging from $41.95 to $42.075, inclusive. The Reporting Person undertakes to provide the Company any security holder of the Company, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares of Common Stock sold at each separate price within the ranges set forth in this footnote (3).

F4: This stock option, representing a right to purchase a total of 34,199 shares, is fully vested.