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Of the 17 tracked institutions holding IRM, 10 have a 3-year clone track record — 9 of them beat the S&P. Average holder's clone alpha: +5.0pt. It's a gauge of who owns the name, not just how many.
Among the 17 tracked institutional investors we monitor, IRM (IRON MTN INC DEL) is held with a combined value of $10.31B across 109,637,183 shares. The largest holder is VANGUARD GROUP INC with a position worth $3.87B (0.06% of their portfolio). 3 funds opened new positions in the most recent quarter. 5 funds increased their holdings. 9 funds reduced their position.
Total Institutional Value
$10.31B
Total Shares Held
109,637,183
Institutional Holders
17
% of Shares Outstanding
36.8%
of 297.52M shares · SEC 2026-04-24
Days to Cover
4.0-7.6%
7.46M shares short · FINRA 2026-06-30
Tracked 13F institutions hold 36.8% 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 2026-04-24), not a live float.
Ranked by estimated dollars moved (share change × implied price). 13F data lags up to 45 days.
| # | Fund | Value↓ | Portfolio % | Change |
|---|---|---|---|---|
| 1 | VANGUARD GROUP INC | $3.87B | 0.06% | -1.3% |
| 2 | BlackRock, Inc. | $3.37B | 0.06% | +0.3% |
| 3 | STATE STREET CORP | $1.81B | 0.06% | +3.9% |
| 4 | FMR LLC | $764.46M | 0.04% | -6.3% |
| 5 | AQR CAPITAL MANAGEMENT LLC | $183.07M | 0.08% | +100.0% |
| 6 | PRICE T ROWE ASSOCIATES INC /MD/ | $61.45M | 0.01% | -0.9% |
| 7 | ADAGE CAPITAL PARTNERS GP, L.L.C. | $60.27M | 0.09% | -10.2% |
| 8 | MILLENNIUM MANAGEMENT LLC | $46.11M | 0.02% | -21.5% |
| 9 | Point72 Asset Management, L.P. | $38.57M | 0.07% | -52.2% |
| 10 | CITADEL ADVISORS LLC | $38.30M | 0.03% | -66.5% |
| 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, VANGUARD GROUP INC is the largest institutional holder of IRM with a position worth $3.87B, representing 0.06% of their portfolio. In total, 17 institutional investors hold IRM with a combined value of $10.31B.
In the most recent quarter, 3 funds opened a new position in IRM. Additionally, 5 increased their holdings and 9 reduced their positions.
Institutional investors hold $10.31B worth of IRM stock across 17 positions. The largest institutional holder is VANGUARD GROUP INC with $3.87B 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
$128.31
2026-07-24
YTD
+54.1%
91% of 52-week range
