Mithu Bhargava - 01 Mar 2026 Form 4 Insider Report for IRON MOUNTAIN INC (IRM)

Role
EVP, GM Digital Business Unit
Signature
/s/ Christine Zhang, under Power of Attorney dated November 19, 2024, from Mithu Bhargava
Issuer symbol
IRM
Transactions as of
01 Mar 2026
Net transactions value
-$6,058,355
Form type
4
Filing time
03 Mar 2026, 19:15:52 UTC
Previous filing
18 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Bhargava Mithu EVP, GM Digital Business Unit C/O IRON MOUNTAIN INCORPORATED, 85 NEW HAMPSHIRE AVE, SUITE 150, PORTSMOUTH /s/ Christine Zhang, under Power of Attorney dated November 19, 2024, from Mithu Bhargava 03 Mar 2026 0002045996

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 +51,919 +392% $0.000000 65,174 01 Mar 2026 Direct F1, F2
transaction IRM Common Stock, par value $.01 per share Tax liability $2,719,300 -25,102 -39% $108.33 40,072 01 Mar 2026 Direct F2, F3
transaction IRM Common Stock, par value $.01 per share Options Exercise $0 +61,113 +153% $0.000000 101,185 01 Mar 2026 Direct F2, F4
transaction IRM Common Stock, par value $.01 per share Tax liability $3,055,448 -28,205 -28% $108.33 72,980 01 Mar 2026 Direct F2, F3
transaction IRM Common Stock, par value $.01 per share Options Exercise $0 +2,663 +3.6% $0.000000 75,643 01 Mar 2026 Direct F2, F5
transaction IRM Common Stock, par value $.01 per share Tax liability $139,421 -1,287 -1.7% $108.33 74,356 01 Mar 2026 Direct F2, F6
transaction IRM Common Stock, par value $.01 per share Options Exercise $0 +2,754 +3.7% $0.000000 77,110 01 Mar 2026 Direct F2, F7
transaction IRM Common Stock, par value $.01 per share Tax liability $144,187 -1,331 -1.7% $108.33 75,779 01 Mar 2026 Direct F2, F6

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 -51,919 -100% $0.000000 0 01 Mar 2026 Common Stock, par value $.01 per share 51,919 Direct F8, F9
transaction IRM Performance Units Options Exercise $0 -61,113 -100% $0.000000 0 01 Mar 2026 Common Stock, par value $.01 per share 61,113 Direct F8, F10
transaction IRM Restricted Stock Units Options Exercise $0 -2,663 -100% $0.000000 0 01 Mar 2026 Common Stock, par value $.01 per share 2,663 Direct F11, F12
transaction IRM Restricted Stock Units Options Exercise $0 -2,754 -33% $0.000000 5,510 01 Mar 2026 Common Stock, par value $.01 per share 2,754 Direct F11, F13
transaction IRM Restricted Stock Units Award $0 +9,692 $0.000000 9,692 01 Mar 2026 Common Stock, par value $.01 per share 9,692 Direct F11, F14
* 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 Includes 201 shares of Common Stock acquired under the Iron Mountain Incorporated Employee Stock Purchase Plan since the last Section 16 filing by the Reporting Person.
F3 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.
F4 This acquisition is reported to reflect the full vesting of PUs previously granted to the Reporting Person on July 3, 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.
F5 This acquisition is reported to reflect the full vesting of restricted stock units ("RSUs") previously granted to the Reporting Person on March 1, 2023.
F6 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.
F7 This acquisition is reported to reflect the partial vesting of RSUs previously granted to the Reporting Person on March 1, 2025.
F8 Each PU represents a contingent right to receive one share of Common Stock.
F9 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.
F10 The PUs were initially granted to the Reporting Person on July 3, 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.
F11 Each RSU represents a contingent right to receive one share of Common Stock.
F12 The RSUs, representing a contingent right to receive a total of 7,987 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.
F13 The RSUs, representing a contingent right to receive a total of 8,264 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.
F14 The RSUs, representing a contingent right to receive a total of 9,692 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.