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

Iron Mountain's Shares Outstanding history runs 18 years deep, the most recent figure standing at $297.5 million for Q1 2026.

• In Q1 2026, Shares Outstanding rose 0.85% year-over-year to $297.5 million; the TTM figure through Mar 2026 stood at $297.5 million (up 0.85% YoY), while the FY2025 annual figure was $295.8 million, up 0.75% from the prior year.
• Shares Outstanding came in at $297.5 million for Q1 2026 at Iron Mountain, up from $295.8 million in the prior quarter.
• In the past five years, Shares Outstanding ranged from a high of $291.6 billion in Q1 2023 to a low of $290.6 million in Q1 2022.
• A 5-year average of $17.4 billion and a median of $293.3 million in 2024 frame the typical range for Shares Outstanding.
• Across the five-year window, Shares Outstanding soared 100256.07% in 2023 and tumbled 99.9% in 2024, its largest moves.
• Iron Mountain's Shares Outstanding stood at $290.8 million in 2022, then increased by 0.45% to $292.1 million in 2023, then rose by 0.5% to $293.6 million in 2024, then grew by 0.75% to $295.8 million in 2025, then increased by 0.57% to $297.5 million in 2026.
• According to Business Quant data, Shares Outstanding over the past three periods registered $297.5 million, $295.8 million, and $295.5 million for Q1 2026, Q4 2025, and Q3 2025 respectively.

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