Borges Daniel 4
4 · IRON MOUNTAIN INC · Filed Mar 3, 2026
Insider Transaction Report
Form 4
Borges Daniel
SVP & Chief Accounting Officer
Transactions
- Exercise/Conversion
Common Stock, par value $.01 per share
[F1]2026-03-01+9,152→ 9,440 total - Tax Payment
Common Stock, par value $.01 per share
[F2]2026-03-01$108.33/sh−3,106$336,473→ 6,334 total - Exercise/Conversion
Common Stock, par value $.01 per share
[F3]2026-03-01+713→ 7,047 total - Tax Payment
Common Stock, par value $.01 per share
[F4]2026-03-01$108.33/sh−327$35,424→ 6,720 total - Exercise/Conversion
Common Stock, par value $.01 per share
[F5]2026-03-01+463→ 7,183 total - Tax Payment
Common Stock, par value $.01 per share
[F4]2026-03-01$108.33/sh−212$22,966→ 6,971 total - Exercise/Conversion
Common Stock, par value $.01 per share
[F6]2026-03-01+402→ 7,373 total - Tax Payment
Common Stock, par value $.01 per share
[F4]2026-03-01$108.33/sh−184$19,933→ 7,189 total - Exercise/Conversion
Performance Units
[F7][F8]2026-03-01−9,152→ 0 total→ Common Stock, par value $.01 per share (9,152 underlying) - Exercise/Conversion
Restricted Stock Units
[F9][F10]2026-03-01−713→ 0 total→ Common Stock, par value $.01 per share (713 underlying) - Exercise/Conversion
Restricted Stock Units
[F9][F11]2026-03-01−463→ 463 total→ Common Stock, par value $.01 per share (463 underlying) - Exercise/Conversion
Restricted Stock Units
[F9][F12]2026-03-01−402→ 805 total→ Common Stock, par value $.01 per share (402 underlying) - Award
Restricted Stock Units
[F9][F13]2026-03-01+1,104→ 1,104 total→ Common Stock, par value $.01 per share (1,104 underlying)
Footnotes (13)
- [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 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.
- [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.
Signature
/s/ Christine Zhang, under Power of Attorney dated June 19, 2025 from Daniel Borges|2026-03-03