What is Iron Mountain's shares (basic)?

Iron Mountain (IRM) reported shares (basic) of 296.8M in Q1 2026.

How has Iron Mountain's shares (basic) changed year-over-year?

Iron Mountain's shares (basic) increased by 0.8% year-over-year, from 294.5M to 296.8M.

What does shares (basic) mean?

The average number of actual shares owned by investors throughout the year, accounting for any shares the company bought back or issued.

Earnings Per Share

Shares (Basic)

Iron Mountain Shares (Basic) increased by 0.4% to 296.8M in Q1 2026 compared to the prior quarter. Year-over-year, this metric grew by 0.8%, from 294.5M to 296.8M.

Analysis

StatementIncome Statement

SectionEarnings Per Share

CategoryCapital Allocation

SignalContext dependent

VolatilityStable

First reportedQ4 2013

Last reportedQ4 2025

How to read this metric

A decreasing trend typically signals an aggressive share buyback program, which can increase the value of remaining shares.

Detailed definition

Weighted-average shares outstanding (basic) is the calculation of the total number of common shares held by the public d...

Peer comparison

Used to evaluate the scale of a company's equity base relative to its market capitalization and peer group.

Metric ID: weighted_shares_basic

Historical Data

15 periods

	Q2 '21	Q3 '21	Q1 '22	Q2 '22	Q3 '22	Q1 '23	Q2 '23	Q3 '23	Q1 '24	Q2 '24	Q3 '24	Q1 '25	Q2 '25	Q3 '25	Q1 '26
Value	289.2M	289.8M	290.3M	290.8M	290.9M	291.4M	291.8M	292.1M	292.7M	293.3M	293.6M	294.5M	295.4M	295.8M	296.8M
QoQ Change	—	+0.2%	+0.2%	+0.1%	+0.1%	+0.2%	+0.1%	+0.1%	+0.2%	+0.2%	+0.1%	+0.3%	+0.3%	+0.1%	+0.4%
YoY Change	—	—	—	+0.5%	+0.4%	+0.4%	+0.4%	+0.4%	+0.4%	+0.5%	+0.5%	+0.6%	+0.7%	+0.7%	+0.8%

Range289.2M – 296.8M

CAGR+0.7%

Avg YoY Growth+0.5%

Median YoY Growth+0.5%

Current Streak14+ quarters growth

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Frequently Asked Questions

What is Iron Mountain's shares (basic)?: Iron Mountain (IRM) reported shares (basic) of 296.8M in Q1 2026.
How has Iron Mountain's shares (basic) changed year-over-year?: Iron Mountain's shares (basic) increased by 0.8% year-over-year, from 294.5M to 296.8M.
What does shares (basic) mean?: The average number of actual shares owned by investors throughout the year, accounting for any shares the company bought back or issued.