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Of the 15 tracked institutions holding IRM, 8 have a 3-year clone track record — 8 of them beat the S&P. Average holder's clone alpha: +5.5pt. It's a gauge of who owns the name, not just how many.
Among the 15 tracked institutional investors we monitor, IRM (IRON MTN INC DEL) is held with a combined value of $11.92B across 110,331,186 shares. The largest holder is BlackRock, Inc. with a position worth $4.24B (0.06% of their portfolio). 10 funds increased their holdings. 5 funds reduced their position.
Total Institutional Value
$11.92B
Total Shares Held
110,331,186
Institutional Holders
15
% of Shares Outstanding
37.1%
of 297.70M shares · SEC 2026-07-24
Days to Cover
3.9-15.2%
7.10M shares short · FINRA 2026-08-14
Tracked 13F institutions hold 37.1% of IRM's shares outstanding. This is a floor: 13F filings arrive on a ~45-day lag and we track only a subset of institutional filers, so true institutional ownership is higher. Shares-outstanding is the latest SEC cover-page figure (as of 2026-07-24), not a live float.
Ranked by estimated dollars moved (share change × implied price). 13F data lags up to 45 days.
0
$0
14
$14.10M
Total Transactions
14
Last 12 months
| Date | Insider | Code | Type | Shares | Value |
|---|---|---|---|---|---|
| Sep 1, 2026 | William L Meaney | S | Sale | 6,101 | $701.62K |
| Sep 1, 2026 | Greg W McIntosh | S | Sale | 5,000 | $578.00K |
| Sep 1, 2026 | Mark Kidd | S | Sale | 6,000 | $693.60K |
| Sep 1, 2026 | William L Meaney | S | Sale | 20,952 | $2.39M |
| Sep 1, 2026 | William L Meaney | S | Sale | 89 | $10.32K |
| Sep 1, 2026 | William L Meaney | S | Sale | 11,332 | $1.29M |
| Aug 7, 2026 | Mark Kidd | S | Sale | 6,000 | $736.20K |
| Aug 7, 2026 | William L Meaney | S | Sale | 16,785 | $2.05M |
| Aug 7, 2026 | William L Meaney | S | Sale | 18,780 | $2.27M |
| Aug 7, 2026 | William L Meaney | S | Sale | 2,909 | $357.08K |
Showing 10 of 14 transactions
| # | Fund | Value↓ | Portfolio % | Change |
|---|---|---|---|---|
| 1 | BlackRock, Inc. | $4.24B | 0.06% | +1.7% |
| 2 | VANGUARD GROUP INC | $3.87B | 0.06% | -1.3% |
| 3 | STATE STREET CORP | $2.24B | 0.07% | +0.5% |
| 4 | FMR LLC | $994.36M | 0.04% | +5.2% |
| 5 | AQR CAPITAL MANAGEMENT LLC | $266.50M | 0.09% | +15.2% |
| 6 | PRICE T ROWE ASSOCIATES INC /MD/ | $80.16M | 0.01% | +5.5% |
| 7 | ADAGE CAPITAL PARTNERS GP, L.L.C. | $67.60M | 0.09% | -9.3% |
| 8 | WELLINGTON MANAGEMENT GROUP LLP | $64.79M | 0.01% | +47.4% |
| 9 | CITADEL ADVISORS LLC | $43.35M | 0.02% | -8.5% |
| 10 | MILLENNIUM MANAGEMENT LLC | $19.84M | 0.01% | -65.2% |
| Member | Type | Date |
|---|---|---|
| Markwayne Mullin | Sell | Feb 4, 2026 |
| Markwayne Mullin | Sell | Dec 18, 2025 |
| Markwayne Mullin | Sell | Dec 18, 2025 |
| Markwayne Mullin | Buy |
As of the latest SEC 13F filings, BlackRock, Inc. is the largest institutional holder of IRM with a position worth $4.24B, representing 0.06% of their portfolio. In total, 15 institutional investors hold IRM with a combined value of $11.92B.
Institutional investors hold $11.92B worth of IRM stock across 15 positions. The largest institutional holder is BlackRock, Inc. with $4.24B in holdings.
A 13F filing is a quarterly report required by the SEC from institutional investment managers with over $100 million in assets. It discloses their holdings in U.S. equities. For IRM, these filings reveal which major funds are accumulating or reducing positions, providing insights into institutional sentiment.
Get notified when hedge funds change their IRM positions.
Alpha = the manager's 3-year clone return minus the S&P 500. A skilled roster is a stronger tell than a crowded one — though even skilled managers' edge doesn't reliably survive the 13F disclosure lag. Why →
| Feb 3, 2025 |
| Markwayne Mullin | Buy | Jan 2, 2025 |
| Thomas R Carper | Buy | Jul 9, 2020 |
| Thomas R Carper | Sell | Apr 2, 2020 |
| Cory A Booker | Sell | Aug 8, 2014 |
Last Close
$115.22
2026-09-09
YTD
+38.4%
67% of 52-week range
