Iron Mountain Inc. 13F holders
Of the 44 funds followed here, 8 reported a position in Iron Mountain Inc. in a 13F for the quarter ended 30 June 2026. The largest: Geode Capital Management, 8.6 million shares worth $1.09 billion, 0.1% of its reported book. Sold out: Soros Fund Management, Bridgewater Associates.
| Fund | Shares | Value | Of its book | Change on the quarter | Status | Quarter ended | Filing |
|---|---|---|---|---|---|---|---|
| Geode Capital Management | 8,649,249 | $1.09 billion | 0.1% | +163,122 | added | 30 June 2026 | 13F |
| FMR LLC | 7,872,365 | $994.4 million | 0.0% | +387,967 | added | 30 June 2026 | 13F |
| Norges Bank | 4,214,697 | $532.4 million | 0.1% | held | 30 June 2026 | 13F | |
| Citadel Advisors | 628,968 | $79.4 million | 0.0% | -50,586 | trimmed | 30 June 2026 | 13F |
| Millennium Management | 252,157 | $31.8 million | 0.0% | -199,306 | trimmed | 30 June 2026 | 13F |
| Point72 Asset Management | 123,262 | $15.6 million | 0.0% | -254,356 | trimmed | 30 June 2026 | 13F |
| Two Sigma Investments | 70,692 | $8.9 million | 0.0% | -117,510 | trimmed | 30 June 2026 | 13F |
| Renaissance Technologies | 7,700 | $972,587 | 0.0% | +5,300 | added | 30 June 2026 | 13F |
| Soros Fund Management | 0 | $0 | 0.0% | -310,000 | exited | 30 June 2026 | 13F |
| Bridgewater Associates | 0 | $0 | 0.0% | -4,694 | exited | 30 June 2026 | 13F |
Value is what the fund reported. Change is shares against the fund's previous 13F; a fund with one filing read shows no change. 13Fs cover long US positions of managers above $100 million and are filed up to 45 days after the quarter.
Schedule 13D and 13G filed on the name, last twelve months
| Filed | Schedule | Who | Holding | Of the class | Event date | Rule or purpose | Filing |
|---|---|---|---|---|---|---|---|
| 7 May 2026 | 13G/A | Cohen & Steers, Inc. and 9 others | 14.6 million | 4.9% | 30 April 2026 | passive, institutional (13d-1(b)) | EDGAR |
| 30 April 2026 | 13G | Vanguard Capital Management and 1 other | 21.9 million | 7.3% | 31 March 2026 | passive, institutional (13d-1(b)) | EDGAR |
| 29 April 2026 | 13G | Vanguard Portfolio Management and 1 other | 25.1 million | 8.4% | 31 March 2026 | passive, institutional (13d-1(b)) | EDGAR |
| 27 March 2026 | 13G/A | The Vanguard Group and 1 other | 0 | 0.0% | 13 March 2026 | passive, institutional (13d-1(b)) | EDGAR |
| 13 February 2026 | 13G/A | Cohen & Steers, Inc. and 9 others | 19.1 million | 6.5% | 31 December 2025 | passive, institutional (13d-1(b)) | EDGAR |
| 14 November 2025 | 13G | Cohen & Steers, Inc. and 9 others | 16.0 million | 5.4% | 30 September 2025 | passive, institutional (13d-1(b)) | EDGAR |
A Schedule 13D is filed by anyone who crosses 5% of a class with intent to influence; a 13G by a passive holder. Amendments (/A) report a change, including an exit to zero. Holding and percentage are as the filer stated them on the cover page; the purpose is the filer's own words, cut short.
Fails to deliver
| Settlement date | Shares failed | Price | File |
|---|---|---|---|
| 25 August 2026 | 501 | $121.19 | SEC |
| 24 August 2026 | 123 | $122.02 | SEC |
| 21 August 2026 | 330 | $122.94 | SEC |
| 18 August 2026 | 1,523 | $129.90 | SEC |
| 4 August 2026 | 54 | $124.08 | SEC |
| 16 July 2026 | 3,635 | $123.52 | SEC |
Shares that failed to deliver at settlement, per day, from the SEC's half-month files, which arrive about two weeks after the period. Largest in the window: 3,635 on 16 July 2026. A fail is an operational fact about settlement, not a position.
Source
Each fund's 13F-HR on EDGAR, linked per row; positions matched to IRM by CUSIP from the SEC's own fails-to-deliver files; Schedule 13D and 13G from the company's own filing index, each read to confirm the company is the issuer named.
The same record on your computer
GreekSoup is also a free program for your own computer. It reads these same filings for the names you follow, refreshed as they land, with no account. One pasted line installs it.