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

Historic Shares Outstanding (Diluted Average) for Iron Mountain (IRM) over the last 16 years, with Q4 2025 value amounting to $297.8 million.

  • Iron Mountain's Shares Outstanding (Diluted Average) rose 53.4% to $297.8 million in Q4 2025 from the same period last year, while for Dec 2025 it was $297.8 million, marking a year-over-year increase of 53.4%. This contributed to the annual value of $297.8 million for FY2025, which is 53.4% up from last year.
  • Per Iron Mountain's latest filing, its Shares Outstanding (Diluted Average) stood at $297.8 million for Q4 2025, which was up 53.4% from $298.0 million recorded in Q3 2025.
  • Iron Mountain's Shares Outstanding (Diluted Average)'s 5-year high stood at $298.0 million during Q3 2025, with a 5-year trough of $289.5 million in Q1 2021.
  • Its 5-year average for Shares Outstanding (Diluted Average) is $293.9 million, with a median of $293.7 million in 2023.
  • In the last 5 years, Iron Mountain's Shares Outstanding (Diluted Average) skyrocketed by 96.37% in 2021 and then dropped by 16.02% in 2025.
  • Over the past 5 years, Iron Mountain's Shares Outstanding (Diluted Average) (Quarter) 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 grew by 0.77% to $296.2 million in 2024, then rose by 0.53% to $297.8 million in 2025.
  • Its last three reported values are $297.8 million in Q4 2025, $298.0 million for Q3 2025, and $295.4 million during Q2 2025.