IRON MOUNTAIN INC — Proxy Solicitation & Information Statement 2023

Mar 30, 2023

DEFA14A 1 irm4112791-defa14a.htm DEFINITIVE ADDITIONAL PROXY SOLICITING MATERIALS

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. )

☑ Filed by the Registrant ☐ Filed by a party other than the Registrant

CHECK THE APPROPRIATE BOX:
☐	Preliminary Proxy Statement
☐	Confidential, for Use of the Commission Only
(as permitted by Rule 14a-6(e)(2))
☐	Definitive Proxy Statement
☑	Definitive Additional Materials
☐	Soliciting Material under §240.14a-12

IRON MOUNTAIN INCORPORATED

(Name of Registrant as Specified In Its Charter) (Name of Person(s) Filing Proxy Statement, if other than the Registrant)

PAYMENT OF FILING FEE (CHECK ALL BOXES THAT APPLY):
☑	No fee required
☐	Fee paid previously with preliminary materials
☐	Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11

IRON MOUNTAIN INCORPORATED
2023 Annual Meeting
Vote by May 8, 2023
11:59 PM ET
IRON MOUNTAIN INCORPORATED INVESTOR RELATIONS 85 NEW HAMPSHIRE AVE, SUITE 150 PORTSMOUTH, NH 03801
V09061-P83659

You invested in IRON MOUNTAIN INCORPORATED and it’s time to vote!

You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy material for the stockholder meeting to be held on May 9, 2023.

Get informed before you vote

View the Notice and Proxy Statement and Annual Report online OR you can receive a free paper or email copy of the material(s) by requesting prior to April 25, 2023. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you will not otherwise receive a paper or email copy.

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Control #	●

Smartphone users Point your camera here and vote without entering a control number Vote Virtually at the Meeting* May 9, 2023 12:00 PM EDT Virtually at: www.virtualshareholdermeeting.com/IRM2023

• Please check the meeting materials for any special requirements for meeting attendance.

Vote at www.ProxyVote.com

THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming stockholder meeting. Please follow the instructions on the reverse side to vote these important matters.

Voting Items		Board Recommends
1.	For the election of ten (10) directors to the Iron Mountain Incorporated Board of Directors for a one-year term or until their successors
are elected and qualified. Nominees:
1a.	Jennifer Allerton	For
1b.	Pamela M. Arway	For
1c.	Clarke H. Bailey	For
1d.	Kent P. Dauten	For
1e.	Monte Ford	For
1f.	Robin L. Matlock	For
1g.	William L. Meaney	For
1h.	Wendy J. Murdock	For
1i.	Walter C. Rakowich	For
1j.	Doyle R. Simons	For
2.	The approval of a non-binding, advisory resolution approving the compensation of our named executive officers as described in the Iron Mountain Incorporated Proxy Statement.	For
3.	The
approval on a non-binding, advisory basis of the frequency (every one, two or three years) of future non-binding, advisory votes of stockholders on the compensation of our named executive officers.	Year
4.	The
ratification of the selection by the Audit Committee of Deloitte & Touche LLP as Iron Mountain Incorporated’s independent registered public accounting firm for the year ending December 31, 2023.	For
NOTE: In their discretion, the proxies are authorized to vote upon such other business as may properly come before the Annual Meeting of Stockholders or any postponement or adjournment thereof.
Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Delivery Settings”.
V09062-P83659