Iron Mountain Incorporated
Iron Mountain Incorporated (IRM) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · IRM · as of Sep 30, 2024
Ownership Breakdown
1,098
Institutional Holders
▲ 98 vs Q2
$28.77B
Total Inst. Value
▲ $6.55B vs Q2
297.52M
Shares Outstanding
freeFloat 99.05%
242.46M
13F Shares Held
▼ 5.40M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
IRM largest shareholders · institutional ownership
Q3 2024 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
VANGUARD GROUP INC real estate investment trusts | 46.60M | 15.87% | 15.87% | $5.54T | Nov 13, 2024 | ▼ 39.5K |
BLACKROCK, INC. real estate investment trusts | 31.31M | 10.66% | 10.66% | $3.72T | Nov 13, 2024 | NEW |
COHEN & STEERS, INC. real estate investment trusts | 17.73M | 6.04% | 6.04% | $2.11T | Nov 14, 2024 | ▼ 5.33M |
STATE STREET CORP real estate investment trusts | 16.57M | 5.64% | 5.64% | $1.98T | Nov 14, 2024 | ▼ 948.4K |
GEODE CAPITAL MANAGEMENT, LLC real estate investment trusts | 8.26M | 2.81% | 2.81% | $978.48B | Nov 12, 2024 | ▲ 128.6K |
DIMENSIONAL FUND ADVISORS LP real estate investment trusts | 4.20M | 1.43% | 1.43% | $499.56B | Nov 7, 2024 | ▼ 81.9K |
CAPITAL WORLD INVESTORS real estate investment trusts | 4.12M | 1.40% | 1.40% | $489.10B | Nov 13, 2024 | ▼ 177 |
MORGAN STANLEY real estate investment trusts | 3.64M | 1.24% | 1.24% | $432.65B | May 14, 2025 | ▼ 14.6K |
LEGAL & GENERAL GROUP PLC real estate investment trusts | 3.51M | 1.20% | 1.20% | $417.09B | Feb 28, 2025 | ▲ 56.7K |
DEUTSCHE BANK AG\ real estate investment trusts | 3.48M | 1.18% | 1.18% | $413.23B | Jun 26, 2025 | ▼ 446.3K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2024 vs prior quarter
Q3 2024
18
Increased
+6.49M shares1
New Positions
first time holders31
Decreased
−12.99M shares0
Sold Out
fully exitedNet shares change (top 50)
6.49M
+6.49M / −12.99M
Net new holders
-12
1 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
IRM insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
16
Buy transactions
19
Sell transactions
0.84
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Meaney William L President and CEO | Jun 1, 2026 | Sale | 10,156 | $126.20 | $1.28M | 28.3K | Form 4 ↗ |
Meaney William L President and CEO | Jun 1, 2026 | Sale | 10,457 | $127.00 | $1.33M | 17.9K | Form 4 ↗ |
Meaney William L President and CEO | Jun 1, 2026 | Sale | 7,523 | $127.90 | $962.2K | 10.3K | Form 4 ↗ |
Meaney William L President and CEO | Jun 1, 2026 | Sale | 9,247 | $129.14 | $1.19M | 1.1K | Form 4 ↗ |
Meaney William L President and CEO | Jun 1, 2026 | Sale | 1,091 | $129.66 | $141.5K | 0 | Form 4 ↗ |
Kidd Mark EVP, GM Data Centers & ALM | Jun 1, 2026 | Sale | 6,000 | $126.70 | $760.2K | 113.5K | Form 4 ↗ |
Borges Daniel SVP & Chief Accounting Officer | May 21, 2026 | Sale | 7,189 | $125.50 | $902.2K | 0 | Form 4 ↗ |
RAKOWICH WALTER C director | May 20, 2026 | Sale | 757 | $124.45 | $94.2K | 1.1K | Form 4 ↗ |
Arway Pamela M director | May 12, 2026 | Sale | 1,892 | $128.97 | $244.0K | 40.2K | Form 4 ↗ |
Meaney William L President and CEO | May 8, 2026 | Sale | 14,876 | $128.52 | $1.91M | 23.6K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Iron Mountain Incorporated (IRM) is primarily owned by institutional investors, who hold approximately 81.5% of total shares outstanding. Company insiders own approximately 0.95%, while retail and public investors account for the remaining 17.56%.
The largest institutional shareholder of Iron Mountain Incorporated is VANGUARD GROUP INC, holding approximately 46.60 million shares — equal to 15.87% of outstanding shares — as of September 30, 2024.
A total of 1,098 institutional investors currently hold IRM stock, with a combined institutional value of approximately $28.77 billion as of the most recent 13F filing period.
Frequently asked questions
IRM ownershipIron Mountain Incorporated (IRM) is primarily owned by institutional investors, who hold approximately 81.5% of shares. The largest shareholder is VANGUARD GROUP INC with a 15.87% stake. Company insiders hold 0.95%. Data sourced from SEC Form 13F as of September 30, 2024.