IRON MOUNTAIN INC — Director's Dealing 2022

Feb 28, 2022

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: IRON MOUNTAIN INC (IRM)
CIK: 0001020569
Period of Report: 2022-02-24

Reporting Person: MARSON DEBORAH (EVP, General Counsel, Sec.)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2022-02-24	Common Stock, par value $.01 per share	M	11939	—	Acquired	54639	Direct
2022-02-24	Common Stock, par value $.01 per share	F	3504	$45.43	Disposed	51135	Direct
2022-02-25	Common Stock, par value $.01 per share	S	500	$46.52	Disposed	50635	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2022-02-24	Performance Units	$	A	11939	Acquired		Common Stock (11939.0)	Direct
2022-02-24	Performance Units	$	M	11939	Disposed		Common Stock (11939.0)	Direct

Footnotes

F1: This acquisition is reported to reflect the full vesting of performance units ("PUs") previously granted to the Reporting Person on February 20, 2019. Effective February 24, 2022, 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, 2022.

F2: This transaction was effected pursuant to a 10b5-1 trading plan which was approved and became effective as of March 10, 2021.

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 20, 2019. This Form 4 is being filed to reflect the determination by the Compensation Committee, effective as of February 24, 2022, 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 20, 2019 and fully vested on February 24, 2022.

F6: The PUs were initially granted to the Reporting Person on February 20, 2019. Effective February 24, 2022, 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, 2022.