IRON MOUNTAIN INC — Director's Dealing 2018

May 22, 2018

SEC Form 4/A — Form 4/A

Issuer: IRON MOUNTAIN INC (IRM)
CIK: 0001020569
Period of Report: 2018-02-16

Reporting Person: Keddy Patrick J (EVP, GM, N. America, W.Europe)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2018-02-20	Common Stock, par value $.01 per share	M	1005	—	Acquired	14738	Direct
2018-02-20	Common Stock, par value $.01 per share	F	471	$32.12	Disposed	14267	Direct
2018-02-20	Common Stock, par value $.01 per share	M	4853	—	Acquired	19120	Direct
2018-02-20	Common Stock, par value $.01 per share	F	2280	$32.12	Disposed	16840	Direct
2018-02-20	Common Stock, par value $.01 per share	M	861	—	Acquired	17701	Direct
2018-02-20	Common Stock, par value $.01 per share	F	404	$32.12	Disposed	17297	Direct
2018-02-20	Common Stock, par value $.01 per share	M	2560	—	Acquired	19857	Direct
2018-02-20	Common Stock, par value $.01 per share	F	1203	$32.12	Disposed	18654	Direct

Footnotes

F1: This transaction is being reported to reflect the full vesting of performance units ("PUs") initially granted to the Reporting Person on February 19, 2015. Effective February 16, 2018, 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 on February 20, 2018.

F2: This amendment is being filed to correct a clerical error in the number of shares withheld to satisfy the Reporting Person's tax obligation with respect to the vesting of PUs and restricted stock units ("RSUs").

F3: This transaction is being reported to reflect the full vesting of PUs initially granted to the Reporting Person on May 27, 2015. Effective February 16, 2018, the Compensation Committee determined the actual award of PUs under the grant after completion of the relevant performance period, and the PUs vested on February 20, 2018.

F4: This acquisition is reported to reflect the partial vesting of RSUs previously granted to the Reporting Person on February 19, 2015.

F5: This acquisition is reported to reflect the partial vesting of RSUs previously granted to the Reporting Person on February 18, 2016.