Transaction Details

Footnotes

Each Performance Unit ("PU") represents a contingent right to receive one share of Iron Mountain Incorporated common stock ("Common Stock"). | The PUs were initially granted to the Reporting Person on March 1, 2023. This Form 4 is being filed to reflect the determination by the Compensation Committee, effective as of February 16, 2026, of the actual award of PUs under the grant after completion of the relevant performance period. | The PU were initially granted to the Reporting Person on March 1, 2023, and will fully vest on March 1, 2026. | The PUs were initially granted to the Reporting Person on July 3, 2023. This Form 4 is being filed to reflect the determination by the Compensation Committee, effective as of February 16, 2026, of the actual award of PUs under the grant after completion of the relevant performance period. | The PU were initially granted to the Reporting Person on July 3, 2023, and will fully vest on March 1, 2026.