Vanguard Capital Management Acquires 7.35% Stake in Iron Mountain Inc (IRM)

On April 30, 2026, Vanguard Capital Management LLC filed a Schedule 13G with the SEC, reporting a new significant ownership stake in Iron Mountain Inc (IRM). As of the event date on March 31, 2026, Vanguard beneficially owns 21,872,303 shares of common stock, representing a 7.35% ownership interest in the company. The filing indicates that Vanguard holds sole dispositive power over all 21,872,303 shares, while maintaining sole voting power over 3,113,414 shares. This position includes holdings managed by various affiliates, including Vanguard Asset Management Limited and Vanguard Global Advisers, LLC. The securities were acquired in the ordinary course of business and not for the purpose of influencing or changing the control of the issuer. This filing marks a substantial increase from a previous ownership level of 0.0%, establishing Vanguard as a major institutional shareholder in the Boston-based information management services company.