Iron Mountain Director Acquires Phantom Stock via Deferred Compensation Dividend Reinvestment

Transaction Overview

On October 2, 2026, Doyle Simons, a Director at Iron Mountain Inc ($IRM), acquired 350.49 shares of phantom stock at an effective price of $113.92 per share, representing a total value of approximately $39,927.82.

Filing Details & Context

• Plan Participation: The phantom shares were acquired under the Iron Mountain Incorporated Directors Deferred Compensation Plan.
• Dividend Reinvestment: Per the footnotes, the reported shares reflect the reinvestment of dividends paid on Common Stock into phantom shares.
• Settlement: Each phantom share is the economic equivalent of one share of common stock and becomes payable in common stock following disability or cessation of service as a director.
• Post-Transaction Holdings: Following the transaction, Doyle Simons directly holds 46,563.786 phantom shares.

Market Significance

This transaction has Low trading significance, as it represents routine dividend reinvestment into phantom shares within a deferred compensation plan rather than an open-market purchase or sale.