John Tomovcsik - Sep 2, 2021 Form 4 Insider Report for IRON MOUNTAIN INC (IRM)

Role: EVP, Chief Operating Officer
Signature: /s/ Elizabeth Tammaro, under Power of Attorney dated May 26, 2016, from John Tomovcsik
Stock symbol: IRM
Transactions as of: Sep 2, 2021
Transactions value $: -$1,414,683
Form type: 4
Date filed: 9/7/2021, 05:09 PM
Next filing: Dec 20, 2021

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	IRM	Common Stock, par value $.01 per share	Options Exercise	$979K	+29K	+71.77%	$33.72	69.5K	Sep 2, 2021	Direct	F1
transaction	IRM	Common Stock, par value $.01 per share	Sale	-$1.41M	-29K	-41.78%	$48.72	40.5K	Sep 2, 2021	Direct	F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	IRM	Employee Stock Option (Right to Buy)	Options Exercise	-$979K	-29K	-100%	$33.72	0	Sep 2, 2021	Common Stock	29K	$33.72	Direct	F3

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Includes 457 shares acquired under the Iron Mountain Incorporated Employee Stock Purchase Plan since the last Section 16 filing by the Reporting Person.
F2	This transaction was effected pursuant to a 10b5-1 trading plan which was approved and became effective as of March 10, 2021.
F3	This stock option, representing a right to purchase a total of 29,037 shares, is fully vested.