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Iron Mountain (IRM) Shares Outstanding (Diluted Average) (2016 - 2025)

Iron Mountain (IRM) has disclosed Shares Outstanding (Diluted Average) for 16 consecutive years, with $297.8 million as the latest value for Q4 2025.

  • Quarterly Shares Outstanding (Diluted Average) rose 0.53% to $297.8 million in Q4 2025 from the year-ago period, while the trailing twelve-month figure was $297.8 million through Dec 2025, up 0.53% year-over-year, with the annual reading at $297.8 million for FY2025, 0.53% up from the prior year.
  • Shares Outstanding (Diluted Average) hit $297.8 million in Q4 2025 for Iron Mountain, roughly flat from $297.6 million in the prior quarter.
  • In the past five years, Shares Outstanding (Diluted Average) ranged from a high of $297.8 million in Q4 2025 to a low of $289.5 million in Q1 2021.
  • Historically, Shares Outstanding (Diluted Average) has averaged $293.7 million across 5 years, with a median of $293.4 million in 2023.
  • Biggest five-year swings in Shares Outstanding (Diluted Average): dropped 0.23% in 2024 and later grew 1.37% in 2025.
  • Year by year, Shares Outstanding (Diluted Average) stood at $291.0 million in 2021, then rose by 0.5% to $292.4 million in 2022, then grew by 0.52% to $294.0 million in 2023, then rose by 0.77% to $296.2 million in 2024, then rose by 0.53% to $297.8 million in 2025.
  • Business Quant data shows Shares Outstanding (Diluted Average) for IRM at $297.8 million in Q4 2025, $297.6 million in Q3 2025, and $295.4 million in Q2 2025.