Form 4: Iron Mountain Director Robin Matlock Increases Stake Through Phantom Stock Acquisition

Iron Mountain Director Robin Matlock acquired 7.673 additional phantom stock units on July 3, 2025, through dividend reinvestment, increasing her direct beneficial ownership to 990.554 units.

Summary

• Robin Matlock, a Director of Iron Mountain Inc. (IRM), acquired 7.673 shares of phantom stock.
• The acquisition occurred on July 3, 2025.
• These phantom shares were acquired as a result of dividends paid on Common Stock being reinvested into phantom shares.
• Each phantom share is the economic equivalent of one share of Iron Mountain Common Stock.
• Following this transaction, Matlock directly beneficially owns 990.554 phantom stock units.
• The phantom stock units will become payable in shares of Common Stock on various dates selected by Matlock or as per the Iron Mountain Incorporated Directors Deferred Compensation Plan.

Sentiment

Score: 6

Explanation: The acquisition of additional phantom stock by a director through dividend reinvestment is a positive sign of continued insider alignment with shareholder interests, though it represents a small, routine transaction that does not significantly alter the company's financial or strategic position.

Positives

• Director Robin Matlock increased her beneficial ownership in the company through the acquisition of additional phantom stock.
• The acquisition of phantom stock through dividend reinvestment indicates continued participation in the company's compensation plan and aligns director interests with shareholders.

Future Outlook

No specific future outlook or guidance is provided in this insider transaction report.

Management Comments

• "Pursuant to the Reporting Person's election to participate in the Iron Mountain Incorporated Directors Deferred Compensation Plan (the 'Plan'), the shares of phantom stock (the 'Phantom Shares') will become payable in shares of Iron Mountain Incorporated common stock ('Common Stock') on various dates selected by the Reporting Person or as otherwise provided in the Plan."
• "Each Phantom Share is the economic equivalent of one share of Common Stock."
• "These shares give effect to dividends paid on Common Stock as if reinvested in Phantom Shares."

Industry Context

This Form 4 reports a routine insider transaction, specifically the acquisition of phantom stock through dividend reinvestment. This is a common mechanism for director compensation and alignment with shareholder interests across various industries, rather than an indicator of broader industry trends.

Comparison to Industry Standards

• The acquisition of phantom stock through dividend reinvestment is a standard practice in director compensation plans across various industries, aligning director interests with long-term shareholder value. This transaction is consistent with typical corporate governance practices for executive and director compensation.

Corporate Governance

Stakeholder Impact

• Shareholders: The transaction indicates continued alignment of a director's interests with shareholders through participation in the company's deferred compensation plan and dividend reinvestment.

Next Steps

• Phantom shares will become payable in Common Stock on various dates selected by the Reporting Person or as provided in the Iron Mountain Incorporated Directors Deferred Compensation Plan.

Key Dates

Recommendation

Keywords

Iron Mountain, IRM, Form 4, insider transaction, beneficial ownership, phantom stock, director compensation, dividend reinvestment