KPIs & Operating Metrics(New)
Growth Metrics

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

Iron Mountain (IRM) has disclosed Shares Outstanding for 17 consecutive years, with $295.8 million as the latest value for Q4 2025.

  • Quarterly Shares Outstanding rose 0.75% to $295.8 million in Q4 2025 from the year-ago period, while the trailing twelve-month figure was $295.8 million through Dec 2025, up 0.75% year-over-year, with the annual reading at $295.8 million for FY2025, 0.75% up from the prior year.
  • Shares Outstanding hit $295.8 million in Q4 2025 for Iron Mountain, roughly flat from $295.5 million in the prior quarter.
  • In the past five years, Shares Outstanding ranged from a high of $295.0 billion in Q1 2025 to a low of $288.7 million in Q1 2021.
  • Historically, Shares Outstanding has averaged $29.6 billion across 5 years, with a median of $292.0 million in 2023.
  • Biggest five-year swings in Shares Outstanding: tumbled 99.9% in 2024 and later skyrocketed 100542.49% in 2025.
  • Year by year, Shares Outstanding stood at $289.8 million in 2021, then grew by 0.37% to $290.8 million in 2022, then rose by 0.45% to $292.1 million in 2023, then grew by 0.5% to $293.6 million in 2024, then increased by 0.75% to $295.8 million in 2025.
  • Business Quant data shows Shares Outstanding for IRM at $295.8 million in Q4 2025, $295.5 million in Q3 2025, and $295.3 million in Q2 2025.