X0206 3 2024-10-01 0 0001020569 IRON MOUNTAIN INC IRM 0002039171 Altamura Michelle Vervais C/O IRON MOUNTAIN INCORPORATED 85 NEW HAMPSHIRE AVE, SUITE 150 PORTSMOUTH NH 03801 0 1 0 0 EVP, General Counsel, Sec. Common Stock, par value $.01 per share 2286 D Restricted Stock Units Common Stock 1074 D Restricted Stock Units Common Stock 2916 D Restricted Stock Units Common Stock 3642 D Restricted Stock Units Common Stock 1295 D The restricted stock units ("RSUs"), representing a contingent right to receive a total of 3,221 shares of Common Stock, were granted to the Reporting Person on March 1, 2022 and vest in three substantially equal annual installments beginning on the first anniversary of the grant date. Each RSU represents a contingent right to receive one share of Common Stock. The RSUs, representing a contingent right to receive a total of 4,374 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. 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. The RSUs, representing a contingent right to receive a total of 1,295 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. /s/ Christine Zhang, under Power of Attorney dated September 17, 2024, from Michelle Altamura 2024-10-03 poa_altamura
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