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

Iron Mountain has disclosed Shares Outstanding (Entity) across 18 years of filings, most recently posting $297.7 million for Q2 2026.

• In Q2 2026, Shares Outstanding (Entity) rose 0.81% year-over-year to $297.7 million; the TTM figure through Jun 2026 stood at $297.7 million (up 0.81% YoY), while the FY2025 annual figure was $295.8 million, up 0.75% from the prior year.
• Shares Outstanding (Entity) came in at $297.7 million for Q2 2026 at Iron Mountain, roughly flat from $297.5 million in the prior quarter.
• In the past five years, Shares Outstanding (Entity) ranged from a high of $297.7 million in Q2 2026 to a low of $290.6 million in Q1 2022.
• Average Shares Outstanding (Entity) over 5 years is $293.4 million, with a median of $293.2 million recorded in 2024.
• Year-over-year, Shares Outstanding (Entity) grew 0.36% in 2023 and increased 0.85% in 2026.
• Over 5 years, Shares Outstanding (Entity) stood at $290.8 million in 2022, then grew by 0.45% to $292.1 million in 2023, then increased by 0.5% to $293.6 million in 2024, then climbed by 0.75% to $295.8 million in 2025, then increased by 0.63% to $297.7 million in 2026.
• Per Business Quant data, the three most recent Shares Outstanding (Entity) figures were $297.7 million in Q2 2026, $297.5 million in Q1 2026, and $295.8 million in Q4 2025.