IRON MOUNTAIN INC — Director's Dealing 2018

Aug 31, 2018

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: IRON MOUNTAIN INC (IRM)
CIK: 0001020569
Period of Report: 2018-08-29

Reporting Person: BAILEY CLARK H (Director)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2018-08-29	Phantom Stock	$	A	75.50	Acquired		Common Stock (75.5)	Direct

Footnotes

F1: Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan, the shares of phantom stock (the "Phantom Shares") will become payable in shares of Iron Mountain Incorporated common stock ("Common Stock") following the Reporting Person's disability or cessation of service as a director. Each Phantom Share is the economic equivalent of one share of Common Stock.

F2: The Reporting Person was eligible to receive but, as a result of an error in connection with the administration of the Plan, did not receive the dividend previously paid on Common Stock on July 2, 2018 (the "Dividend"), with respect to those certain restricted stock units granted to the Reporting Person on June 18, 2018 (the "RSUs"). The administrator of the Plan completed this transaction to give retroactive effect to the Dividend solely with respect to the RSUs.