Michelle Vervais Altamura - 02 Jan 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
02 Jan 2026
Net transactions value
-$39,040
Form type
4
Filing time
06 Jan 2026, 18:13:46 UTC
Previous filing
04 Mar 2025
Next filing
03 Mar 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 06 Jan 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 +1,214 +24% $0.000000 6,221 02 Jan 2026 Direct F1
transaction IRM Common Stock, par value $.01 per share Tax liability $39,040 -469 -7.5% $83.24 5,752 02 Jan 2026 Direct

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 -1,214 -50% $0.000000 1,214 02 Jan 2026 Common Stock, par value $.01 per share 1,214 Direct F2, F3
* 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 partial vesting of restricted stock units ("RSUs") previously granted to the Reporting Person on January 2, 2024.
F2 Each RSU represents a contingent right to receive one share of Common Stock.
F3 The RSUs, representing a contingent right to receive a total of 3,642 shares of Common Stock, were granted to the Reporting Person on January 2, 2024 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date.