Iron Mountain (IRM) Shares Outstanding (Weighted Average) (2009 - 2026)

Iron Mountain has disclosed Shares Outstanding (Weighted Average) across 18 years of filings, most recently posting $296.8 million for Q1 2026.

• Shares Outstanding (Weighted Average) for Q1 2026 came in at $296.8 million, up 0.79% year-over-year; the trailing twelve-month figure through Mar 2026 was $296.8 million (up 0.79% YoY), and the FY2025 annual result was $295.4 million, up 0.69% from the prior year.
• Shares Outstanding (Weighted Average) came in at $296.8 million for Q1 2026 at Iron Mountain, roughly flat from $295.4 million in the prior quarter.
• In the past five years, Shares Outstanding (Weighted Average) ranged from a high of $296.8 million in Q1 2026 to a low of $290.3 million in Q1 2022.
• The 5-year median for Shares Outstanding (Weighted Average) is $292.7 million (2024), against an average of $292.9 million.
• Across the five-year window, Shares Outstanding (Weighted Average) advanced 0.37% in 2023 and climbed 0.79% in 2026, its largest moves.
• Iron Mountain's Shares Outstanding (Weighted Average) stood at $290.8 million in 2022, then gained by 0.39% to $291.9 million in 2023, then advanced by 0.49% to $293.4 million in 2024, then grew by 0.69% to $295.4 million in 2025, then rose by 0.49% to $296.8 million in 2026.
• The last three Shares Outstanding (Weighted Average) figures came in at $296.8 million (Q1 2026), $295.4 million (Q4 2025), and $295.2 million (Q3 2025), per Business Quant data.