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

Iron Mountain (IRM) has disclosed Shares Outstanding (Weighted Average) for 17 consecutive years, with $295.4 million as the latest value for Q4 2025.

  • Quarterly Shares Outstanding (Weighted Average) rose 0.69% to $295.4 million in Q4 2025 from the year-ago period, while the trailing twelve-month figure was $295.4 million through Dec 2025, up 0.69% year-over-year, with the annual reading at $295.4 million for FY2025, 0.69% up from the prior year.
  • Shares Outstanding (Weighted Average) hit $295.4 million in Q4 2025 for Iron Mountain, roughly flat from $295.2 million in the prior quarter.
  • In the past five years, Shares Outstanding (Weighted Average) ranged from a high of $295.4 million in Q4 2025 to a low of $288.8 million in Q1 2021.
  • Historically, Shares Outstanding (Weighted Average) has averaged $292.0 million across 5 years, with a median of $291.8 million in 2023.
  • Biggest five-year swings in Shares Outstanding (Weighted Average): increased 0.3% in 2023 and later rose 0.79% in 2025.
  • Year by year, Shares Outstanding (Weighted Average) stood at $289.5 million in 2021, then rose by 0.47% to $290.8 million in 2022, then rose by 0.39% to $291.9 million in 2023, then grew by 0.49% to $293.4 million in 2024, then rose by 0.69% to $295.4 million in 2025.
  • Business Quant data shows Shares Outstanding (Weighted Average) for IRM at $295.4 million in Q4 2025, $295.2 million in Q3 2025, and $295.4 million in Q2 2025.