IRON MOUNTAIN INC — Director's Dealing 2018

May 14, 2018

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: IRON MOUNTAIN INC (IRM)
CIK: 0001020569
Period of Report: 2018-05-10

Reporting Person: DAUTEN KENT P (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2018-05-10	Common Stock, par value $.01 per share	M	9261	$24.902	Acquired	2021938	Direct
2018-05-10	Common Stock, par value $.01 per share	M	9108	$23.033	Acquired	2031046	Direct
2018-05-10	Common Stock, par value $.01 per share	M	15555	$19.251	Acquired	2046601	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2018-05-10	Employee Stock Option (Right to Buy)	$24.902	M	9261	Disposed	2018-06-05	Common Stock (9261.0)	Direct
2018-05-10	Employee Stock Option (Right to Buy)	$23.033	M	9108	Disposed	2019-06-04	Common Stock (9108.0)	Direct
2018-05-10	Employee Stock Option (Right to Buy)	$19.251	M	15555	Disposed	2020-06-04	Common Stock (15555.0)	Direct

Footnotes

F1: This stock option, representing a right to purchase a total of 9,261 shares, is fully vested. The number of stock options granted includes previously reported adjustments effective on September 26, 2014 made in connection with the special distribution declared by the Board of Directors of the Issuer on September 15, 2014 and paid on November 4, 2014 (the "Special Distribution").

F2: This stock option, representing a right to purchase a total of 9,108 shares, is fully vested. The number of stock options granted includes previously reported adjustments effective on September 26, 2014 made in connection with the Special Distribution.

F3: This stock option, representing a right to purchase a total of 15,555 shares, is fully vested. The number of stock options granted includes previously reported adjustments effective on September 26, 2014 made in connection with the Special Distribution.