SCHEDULE: Cohen & Steers Boosts Iron Mountain Stake to 6.46%

Cohen & Steers, Inc. and its affiliates have disclosed a significant passive ownership stake in Iron Mountain, Inc., holding an aggregate of 6.46% of the common stock.

Summary

• Cohen & Steers, Inc. and its affiliated entities have filed an Amendment No. 1 to Schedule 13G, reporting their beneficial ownership in Iron Mountain, Inc. common stock.
• As of December 31, 2025, Cohen & Steers, Inc. beneficially owns 19,106,540 shares, representing 6.46% of Iron Mountain, Inc.'s common stock.
• Cohen & Steers Capital Management, Inc., a subsidiary, beneficially owns 18,919,035 shares, equating to 6.40% of the class.
• Other affiliates, Cohen & Steers UK Limited and Cohen & Steers Ireland Limited, hold smaller stakes of 0.06% (167,379 shares) and 0.01% (20,126 shares) respectively.
• Cohen & Steers Asia Limited reported 0.00% beneficial ownership.
• The securities were acquired and are held in the ordinary course of business, without the purpose or effect of changing or influencing the control of Iron Mountain, Inc.

Sentiment

Score: 7

Explanation: StockSavvy.ai views this as a moderately positive signal, as a significant passive stake from a reputable institutional investor like Cohen & Steers can imply confidence in Iron Mountain's valuation and business model, without suggesting any immediate operational changes.

Positives

• Increased institutional ownership by a prominent asset manager like Cohen & Steers can signal confidence in Iron Mountain, Inc.'s long-term prospects.
• The filing indicates a passive investment strategy, suggesting Cohen & Steers is not seeking to influence management or control, which can be viewed as a stable long-term holding.

Negatives

• NA

Risks

• NA

Future Outlook

The filing does not contain any forward-looking statements or guidance from Iron Mountain, Inc. It solely reports on the beneficial ownership stake of Cohen & Steers.

Industry Context

StockSavvy.ai notes that Schedule 13G filings are routine disclosures by institutional investors who acquire more than 5% of a company's stock with a passive investment intent. This filing indicates that Cohen & Steers, a specialized asset manager known for its focus on real estate and infrastructure, views Iron Mountain, Inc. as a significant holding within its portfolio, aligning with its investment strategy in REITs and data center-related assets.

Stakeholder Impact

• Shareholders: The disclosure of a significant institutional stake by Cohen & Steers may be viewed positively, potentially increasing investor confidence and demand for Iron Mountain's stock.

Key Dates

Recommendation

This Schedule 13G filing primarily serves as a disclosure of an existing passive ownership stake by Cohen & Steers. While the significant institutional interest is a positive indicator, the filing itself does not provide new operational or financial data from Iron Mountain, Inc. that would warrant a change in investment recommendation. A seasoned investor would likely 'hold' their position, acknowledging the institutional confidence while awaiting further fundamental updates from the company.

Keywords

Iron Mountain, Cohen & Steers, Beneficial Ownership, Schedule 13G, Common Stock, Institutional Investor, Passive Investment, Asset Management