Bhargava Mithu 4
4 · IRON MOUNTAIN INC · Filed Mar 3, 2026
Insider Transaction Report
Form 4
Bhargava Mithu
EVP, GM Digital Business Unit
Transactions
- Exercise/Conversion
Common Stock, par value $.01 per share
[F1][F2]2026-03-01+51,919→ 65,174 total - Tax Payment
Common Stock, par value $.01 per share
[F3][F2]2026-03-01$108.33/sh−25,102$2,719,300→ 40,072 total - Exercise/Conversion
Common Stock, par value $.01 per share
[F4][F2]2026-03-01+61,113→ 101,185 total - Tax Payment
Common Stock, par value $.01 per share
[F3][F2]2026-03-01$108.33/sh−28,205$3,055,448→ 72,980 total - Exercise/Conversion
Common Stock, par value $.01 per share
[F5][F2]2026-03-01+2,663→ 75,643 total - Tax Payment
Common Stock, par value $.01 per share
[F6][F2]2026-03-01$108.33/sh−1,287$139,421→ 74,356 total - Exercise/Conversion
Common Stock, par value $.01 per share
[F7][F2]2026-03-01+2,754→ 77,110 total - Tax Payment
Common Stock, par value $.01 per share
[F6][F2]2026-03-01$108.33/sh−1,331$144,187→ 75,779 total - Exercise/Conversion
Performance Units
[F8][F9]2026-03-01−51,919→ 0 total→ Common Stock, par value $.01 per share (51,919 underlying) - Exercise/Conversion
Performance Units
[F8][F10]2026-03-01−61,113→ 0 total→ Common Stock, par value $.01 per share (61,113 underlying) - Exercise/Conversion
Restricted Stock Units
[F11][F12]2026-03-01−2,663→ 0 total→ Common Stock, par value $.01 per share (2,663 underlying) - Exercise/Conversion
Restricted Stock Units
[F11][F13]2026-03-01−2,754→ 5,510 total→ Common Stock, par value $.01 per share (2,754 underlying) - Award
Restricted Stock Units
[F11][F14]2026-03-01+9,692→ 9,692 total→ Common Stock, par value $.01 per share (9,692 underlying)
Footnotes (14)
- [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.
- [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.
- [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.
Signature
/s/ Christine Zhang, under Power of Attorney dated November 19, 2024, from Mithu Bhargava|2026-03-03