Daniel Borges - 01 Mar 2026 Form 4 Insider Report for IRON MOUNTAIN INC (IRM)

Role
SVP & Chief Accounting Officer
Signature
/s/ Christine Zhang, under Power of Attorney dated June 19, 2025 from Daniel Borges
Issuer symbol
IRM
Transactions as of
01 Mar 2026
Net transactions value
-$414,796
Form type
4
Filing time
03 Mar 2026, 18:59:40 UTC
Previous filing
18 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Borges Daniel SVP & Chief Accounting Officer C/O IRON MOUNTAIN INCORPORATED, 85 NEW HAMPSHIRE AVENUE, SUITE 150, PORTSMOUTH /s/ Christine Zhang, under Power of Attorney dated June 19, 2025 from Daniel Borges 03 Mar 2026 0001720656

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 $0 +9,152 +3178% $0.000000 9,440 01 Mar 2026 Direct F1
transaction IRM Common Stock, par value $.01 per share Tax liability $336,473 -3,106 -33% $108.33 6,334 01 Mar 2026 Direct F2
transaction IRM Common Stock, par value $.01 per share Options Exercise $0 +713 +11% $0.000000 7,047 01 Mar 2026 Direct F3
transaction IRM Common Stock, par value $.01 per share Tax liability $35,424 -327 -4.6% $108.33 6,720 01 Mar 2026 Direct F4
transaction IRM Common Stock, par value $.01 per share Options Exercise $0 +463 +6.9% $0.000000 7,183 01 Mar 2026 Direct F5
transaction IRM Common Stock, par value $.01 per share Tax liability $22,966 -212 -3% $108.33 6,971 01 Mar 2026 Direct F4
transaction IRM Common Stock, par value $.01 per share Options Exercise $0 +402 +5.8% $0.000000 7,373 01 Mar 2026 Direct F6
transaction IRM Common Stock, par value $.01 per share Tax liability $19,933 -184 -2.5% $108.33 7,189 01 Mar 2026 Direct F4

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 Performance Units Options Exercise $0 -9,152 -100% $0.000000 0 01 Mar 2026 Common Stock, par value $.01 per share 9,152 Direct F7, F8
transaction IRM Restricted Stock Units Options Exercise $0 -713 -100% $0.000000 0 01 Mar 2026 Common Stock, par value $.01 per share 713 Direct F9, F10
transaction IRM Restricted Stock Units Options Exercise $0 -463 -50% $0.000000 463 01 Mar 2026 Common Stock, par value $.01 per share 463 Direct F9, F11
transaction IRM Restricted Stock Units Options Exercise $0 -402 -33% $0.000000 805 01 Mar 2026 Common Stock, par value $.01 per share 402 Direct F9, F12
transaction IRM Restricted Stock Units Award $0 +1,104 $0.000000 1,104 01 Mar 2026 Common Stock, par value $.01 per share 1,104 Direct F9, F13
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 This acquisition is reported to reflect the full vesting of performance units ("PUs") previously granted to the Reporting Person on March 1, 2023. Effective February 16, 2026, the Compensation Committee of Iron Mountain Incorporated's Board of Directors determined the actual award of PUs under the grant after completion of the relevant performance period, and the PUs fully vested on March 1, 2026.
F2 Represents the number of shares of Common Stock that have been withheld by the Issuer to satisfy its income tax withholding obligation in connection with the net settlement of the PUs and does not represent a sale.
F3 This acquisition is reported to reflect the full vesting of restricted stock units ("RSUs") previously granted to the Reporting Person on March 1, 2023.
F4 Represents the number of shares of Common Stock that have been withheld by the Issuer to satisfy its income tax withholding obligation in connection with the net settlement of the RSUs and does not represent a sale.
F5 This acquisition is reported to reflect the partial vesting of RSUs previously granted to the Reporting Person on March 1, 2024.
F6 This acquisition is reported to reflect the partial vesting of RSUs previously granted to the Reporting Person on March 1, 2025.
F7 Each PU represents a contingent right to receive one share of Common Stock.
F8 The PUs were initially granted to the Reporting Person on March 1, 2023. Effective as of February 16, 2026, the Compensation Committee determined the actual award of PUs under the grant after completion of the relevant performance period, and the PUs fully vested on March 1, 2026.
F9 Each RSU represents a contingent right to receive one share of Common Stock.
F10 The RSUs, representing a contingent right to receive a total of 2,139 shares of Common Stock, were granted to the Reporting Person on March 1, 2023 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date.
F11 The RSUs, representing a contingent right to receive a total of 1,388 shares of Common Stock, were granted to the Reporting Person on March 1, 2024 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date.
F12 The RSUs, representing a contingent right to receive a total of 1,207 shares of Common Stock, were granted to the Reporting Person on March 1, 2025 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date.
F13 The RSUs, representing a contingent right to receive a total of 1,104 shares of Common Stock, were granted to the Reporting Person on March 1, 2026 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date.