IRON MOUNTAIN INC — Director's Dealing 2021

Feb 26, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: IRON MOUNTAIN INC (IRM)
CIK: 0001020569
Period of Report: 2021-02-24

Reporting Person: Meaney William L (Director, President and CEO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-02-24	Common Stock, par value $.01 per share	M	29469	—	Acquired	239970	Direct
2021-02-24	Common Stock, par value $.01 per share	F	13069	$34.65	Disposed	226901	Direct
2021-02-25	Common Stock, par value $.01 per share	S	8200	$34.50	Disposed	218701	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-02-24	Performance Units	$	A	29469	Acquired		Common Stock (29469.0)	Direct
2021-02-24	Performance Units	$	M	29469	Disposed		Common Stock (29469.0)	Direct

Footnotes

F1: This acquisition is reported to reflect the full vesting of performance units ("PUs") previously granted to the Reporting Person on February 15, 2018. Effective February 24, 2021, the Compensation Committee of Iron Mountain Incorporated's Board of Directors (the "Compensation Committee") determined the actual award of PUs under the grant after completion of the relevant performance period, and the PUs vested in full on February 24, 2021.

F2: This transaction was effected pursuant to a 10b5-1 trading plan which was approved and became effective as of May 26,2020.

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

F4: The PUs were initially granted to the Reporting Person on February 15, 2018. This Form 4 is being filed to reflect the determination by the Compensation Committee, effective as of February 24, 2021, of the actual award of PUs under the grant after completion of the relevant performance period.

F5: The PUs were initially granted to the Reporting Person on February 15, 2018 and fully vested on February 24, 2021.

F6: Each PU represents a contingent right to receive one share of Common Stock.

F7: The PUs were initially granted to the Reporting Person on February 15, 2018. Effective February 24, 2021, the Compensation Committee determined the actual award of PUs under the grant after completion of the relevant performance period, and the PUs vested in full on February 24, 2021.