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Form of Proxy

IRON MOUNTAIN INC.

Notes

No. Proposition For Against Abstain
1

Election of Director for a one-year term or until their successors are elected and qualified: Jennifer Allerton

2

Election of Director for a one-year term or until their successors are elected and qualified: Pamela M. Arway

3

Election of Director for a one-year term or until their successors are elected and qualified: Kent P. Dauten

4

Election of Director for a one-year term or until their successors are elected and qualified: June Yee Felix

5

Election of Director for a one-year term or until their successors are elected and qualified: Monte Ford

6

Election of Director for a one-year term or until their successors are elected and qualified: Christie Kelly

7

Election of Director for a one-year term or until their successors are elected and qualified: Robin L. Matlock

8

Election of Director for a one-year term or until their successors are elected and qualified: William L. Meaney

9

Election of Director for a one-year term or until their successors are elected and qualified: Walter C. Rakowich

10

Election of Director for a one-year term or until their successors are elected and qualified: Theodore R. Samuels

11

Election of Director for a one-year term or until their successors are elected and qualified: Doyle R. Simons

12

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.

13

The ratification of the selection by the Audit Committee of Deloitte & Touche LLP as Iron Mountain Incorporateds independent registered public accounting firm for the year ending December 31, 2026.