IRON MOUNTAIN INC — Director's Dealing 2018

May 31, 2018

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: IRON MOUNTAIN INC (IRM)
CIK: 0001020569
Period of Report: 2018-05-29

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2018-05-29	Common Stock, par value $.01 per share	M	1493	—	Acquired	20147	Direct
2018-05-29	Common Stock, par value $.01 per share	F	701	$33.26	Disposed	19446	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2018-05-29	Restricted Stock Units	$	M	1493	Disposed		Common Stock (1493.0)	Direct

Footnotes

F1: This acquisition is reported to reflect the partial vesting of restricted stock units ("RSUs") previously granted to the Reporting Person on May 27, 2015.

F2: Each RSU represents a contingent right to receive one share of Iron Mountain Incorporated common stock ("Common Stock").

F3: The RSUs, representing a contingent right to receive a total of 4,470 shares of Common Stock, were granted to the Reporting Person on May 27, 2015 and have fully vested.