The Board of Directors (the “Board”) of Iron Mountain Incorporated (NYSE: IRM), a global leader in information management services, declared a quarterly cash dividend of $0.993 per share of common stock representing an increase of 15% which is payable on January 6, 2027 to shareholders of record at the close of business on December 15, 2026.

“Based on our strong 2026 performance and continued positive outlook, we are pleased to increase the dividend by 15%. This will mark the fifth increase of the dividend in the past four years and aligns with our long term plan to increase the dividend alongside growth in AFFO per share,” said William L. Meaney, President and Chief Executive Officer.

About Iron Mountain

Iron Mountain Incorporated (NYSE: IRM) partners with more than 240,000 customers across 61 countries, including approximately 95% of the Fortune 1000. We serve as the trusted guardians of what matters most, helping unlock what’s possible. By connecting physical, digital, and intelligent workflows, our lifecycle solutions help organizations realize enterprise value at scale. From complex challenges across information management and digital transformation to data security, data centers, and asset lifecycle management, we empower organizations to navigate an ever-changing landscape to prepare for tomorrow’s possibilities. Our longstanding commitment to safety, security, sustainability, and continuous innovation defines everything we do.

To learn more about Iron Mountain, please visit www.IronMountain.com.

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