Form 4: Iron Mountain Director Acquires Phantom Stock

Iron Mountain Director Robin Matlock acquired 10.189 phantom stock units through the company's deferred compensation plan.

Summary

• Robin Matlock, a Director of Iron Mountain Inc. (IRM), acquired 10.189 phantom stock units.
• The acquisition occurred on January 6, 2026, as part of the company's Directors Deferred Compensation Plan.
• Each phantom share is the economic equivalent of one share of Iron Mountain Common Stock.
• The phantom shares will become payable in Common Stock on various dates selected by Matlock or as per the Plan.
• The reported price for the underlying Common Stock was a weighted average of $84.625, with transactions ranging from $84.304 to $84.979.
• The number of shares gives effect to dividends paid on Common Stock as if reinvested in Phantom Shares.

Sentiment

Score: 7

Explanation: The filing reports a routine insider acquisition of phantom stock through a deferred compensation plan, which is generally a positive sign of alignment between director and shareholder interests. No negative information is present.

Positives

• Director Robin Matlock increased her beneficial ownership in the company through the acquisition of phantom stock.
• Participation in the Directors Deferred Compensation Plan aligns director interests with long-term shareholder value.
• The acquisition includes reinvested dividends, indicating a compounding effect on the director's holdings.

Future Outlook

The phantom stock units will become payable in shares of Iron Mountain Incorporated common stock on various dates selected by the Reporting Person or as otherwise provided in the Directors Deferred Compensation Plan.

Industry Context

This filing represents a routine insider transaction, common for directors participating in deferred compensation plans, which are standard mechanisms for aligning executive and director interests with long-term company performance in the data management and storage industry.

Comparison to Industry Standards

• Participation in deferred compensation plans, where directors elect to receive compensation in the form of phantom stock or other equity-linked instruments, is a common practice across publicly traded companies, including those in the REIT and data management sectors.
• This aligns director incentives with shareholder value, similar to practices at peers like Equinix (EQIX) or Digital Realty Trust (DLR), which also utilize equity-based compensation for their boards.

Corporate Governance

Related Party Transactions

• Acquisition of 10.189 phantom stock units by Director Robin Matlock through the Iron Mountain Incorporated Directors Deferred Compensation Plan.

Stakeholder Impact

• Shareholders: Increased alignment of director's interests with shareholder value through equity-based compensation.

Next Steps

• The phantom shares will become payable in shares of Iron Mountain Incorporated common stock on various dates selected by the Reporting Person or as otherwise provided in the Plan.

Key Dates

Recommendation

This Form 4 filing details a routine acquisition of phantom stock by a director through a deferred compensation plan. While it indicates alignment of interests, it does not provide new fundamental information about the company's operational performance or strategic direction that would warrant a change in investment recommendation. It's a standard insider transaction that typically has minimal impact on short-term stock price movements.

Keywords

Iron Mountain, IRM, Phantom Stock, Deferred Compensation, Director Compensation, Insider Transaction, SEC Form 4, Beneficial Ownership