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

Iron Mountain's Shares Outstanding (Diluted Average) history runs 17 years deep, the most recent figure standing at $298.8 million for Q1 2026.

• In Q1 2026, Shares Outstanding (Diluted Average) rose 0.53% year-over-year to $298.8 million; the TTM figure through Mar 2026 stood at $298.8 million (up 0.53% YoY), while the FY2025 annual figure was $297.8 million, up 0.53% from the prior year.
• Shares Outstanding (Diluted Average) came in at $298.8 million for Q1 2026 at Iron Mountain, roughly flat from $297.8 million in the prior quarter.
• In the past five years, Shares Outstanding (Diluted Average) ranged from a high of $298.8 million in Q1 2026 to a low of $291.8 million in Q1 2022.
• A 5-year average of $294.8 million and a median of $294.3 million in 2023 frame the typical range for Shares Outstanding (Diluted Average).
• Across the five-year window, Shares Outstanding (Diluted Average) fell 0.23% in 2024 and gained 1.49% in 2025, its largest moves.
• Iron Mountain's Shares Outstanding (Diluted Average) stood at $292.4 million in 2022, then rose by 0.52% to $294.0 million in 2023, then advanced by 0.77% to $296.2 million in 2024, then increased by 0.53% to $297.8 million in 2025, then gained by 0.34% to $298.8 million in 2026.
• According to Business Quant data, Shares Outstanding (Diluted Average) over the past three periods registered $298.8 million, $297.8 million, and $298.0 million for Q1 2026, Q4 2025, and Q3 2025 respectively.

Peer Comparison