IRON MOUNTAIN INC — Director's Dealing 2021

Feb 23, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: IRON MOUNTAIN INC (IRM)
CIK: 0001020569
Period of Report: 2021-02-19

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-02-19	Common Stock, par value $.01 per share	M	6656	—	Acquired	83362	Direct
2021-02-19	Common Stock, par value $.01 per share	F	1938	$32.17	Disposed	81424	Direct
2021-02-22	Common Stock, par value $.01 per share	M	2519	—	Acquired	83943	Direct
2021-02-22	Common Stock, par value $.01 per share	F	739	$31.81	Disposed	83204	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-02-19	Restricted Stock Units	$	M	6656	Disposed		Common Stock (6656.0)	Direct
2021-02-22	Restricted Stock Units	$	M	2519	Disposed		Common Stock (2519.0)	Direct

Footnotes

F1: This acquisition is reported to reflect the partial vesting of restricted stock units ("RSUs") previously granted to the Reporting Person on February 19, 2020.

F2: This acquisition is reported to reflect the partial vesting of RSUs previously granted to the Reporting Person on February 20, 2019.

F3: Each RSU represents a contingent right to receive one share of Iron Mountain Incorporated common stock ("Common Stock").

F4: The RSUs, representing a contingent right to receive a total of 19,970 shares of Common Stock, were granted to the Reporting Person on February 19, 2020 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date.

F5: Each RSU represents a contingent right to receive one share of Common Stock.

F6: The RSUs, representing a contingent right to receive a total of 7,558 shares of Common Stock, were granted to the Reporting Person on February 20, 2019 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date.