Michelle Vervais Altamura - 01 Mar 2026 Form 4 Insider Report for IRON MOUNTAIN INC (IRM)

Role
EVP, General Counsel, Sec.
Signature
/s/ Christine Zhang, under Power of Attorney dated September 17, 2024, from Michelle Altamura
Issuer symbol
IRM
Transactions as of
01 Mar 2026
Net transactions value
-$106,922
Form type
4
Filing time
03 Mar 2026, 19:21:59 UTC
Previous filing
06 Jan 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Altamura Michelle Vervais EVP, General Counsel, Sec. C/O IRON MOUNTAIN INCORPORATED, 85 NEW HAMPSHIRE AVE, SUITE 150, PORTSMOUTH /s/ Christine Zhang, under Power of Attorney dated September 17, 2024, from Michelle Altamura 03 Mar 2026 0002039171

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 +1,458 +25% $0.000000 7,210 01 Mar 2026 Direct F1
transaction IRM Common Stock, par value $.01 per share Tax liability $52,648 -486 -6.7% $108.33 6,724 01 Mar 2026 Direct F2
transaction IRM Common Stock, par value $.01 per share Options Exercise $0 +432 +6.4% $0.000000 7,156 01 Mar 2026 Direct F3
transaction IRM Common Stock, par value $.01 per share Tax liability $15,600 -144 -2% $108.33 7,012 01 Mar 2026 Direct F2
transaction IRM Common Stock, par value $.01 per share Options Exercise $0 +1,073 +15% $0.000000 8,085 01 Mar 2026 Direct F4
transaction IRM Common Stock, par value $.01 per share Tax liability $38,674 -357 -4.4% $108.33 7,728 01 Mar 2026 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 Restricted Stock Units Options Exercise $0 -1,458 -100% $0.000000 0 01 Mar 2026 Common Stock, par value $.01 per share 1,458 Direct F5, F6
transaction IRM Restricted Stock Units Options Exercise $0 -432 -50% $0.000000 432 01 Mar 2026 Common Stock, par value $.01 per share 432 Direct F5, F7
transaction IRM Restricted Stock Units Options Exercise $0 -1,073 -33% $0.000000 2,146 01 Mar 2026 Common Stock, par value $.01 per share 1,073 Direct F5, F8
* 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 restricted stock units ("RSUs") previously granted to the Reporting Person on March 1, 2023.
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 RSUs and does not represent a sale.
F3 This acquisition is reported to reflect the partial vesting of RSUs previously granted to the Reporting Person on March 1, 2024.
F4 This acquisition is reported to reflect the partial vesting of RSUs previously granted to the Reporting Person on March 1, 2025.
F5 Each RSU represents a contingent right to receive one share of Common Stock.
F6 The RSUs, representing a contingent right to receive a total of 4,374 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.
F7 The RSUs, representing a contingent right to receive a total of 1,295 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.
F8 The RSUs, representing a contingent right to receive a total of 3,219 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.