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IRM in the 13F filings

Iron MTN Inc Del · CUSIP 46284V101

Sector · Real estateTheme · Real estate investment trusts
Quarter
Q2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023Q3 2023
Quarter end
30 Jun 2026
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 3 Aug 2026
Managers listing it
28
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q1 2026 and Q2 2026; 8 listed it in both
Shares listed
19,519,961
combined, among listed positions
Reported value
$2.4bn
combined, at the quarter end

AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.

Among the 91 comparable managers: 13 buyers (opened or added shares) and 17 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was -670,266.

Managers listing IRM in Q2 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q1 2026, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

28 of 28 holders

ActionFiling
Fidelity (FMR LLC)7,872,365$994munder 0.1%Added+387,96713 Aug 2026 (the filing on sec.gov)
Invesco Ltd4,065,649$514munder 0.1%Added+144,12814 Aug 2026 (the filing on sec.gov)
AQR Capital Management LLC2,127,095$267m0.09%Added+281,02214 Aug 2026 (the filing on sec.gov)
Capital World Investors1,217,169$154munder 0.1%Trimmed-650,00012 Aug 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc634,613$80munder 0.1%Added+33,03214 Aug 2026 (the filing on sec.gov)
Wellington Management Group LLP512,906$65munder 0.1%Added+164,99114 Aug 2026 (the filing on sec.gov)
AllianceBernstein LP562,711$57munder 0.1%Trimmed-2,54414 Aug 2026 (the filing on sec.gov)
Voloridge Investment Management LLC412,748$52m0.22%Newnew14 Aug 2026 (the filing on sec.gov)
Jane Street Group LLC396,541$50munder 0.1%Trimmed-310,90014 Aug 2026 (the filing on sec.gov)
Citadel Advisors LLC343,168$43munder 0.1%Trimmed-31,7862 Sep 2026 (the filing on sec.gov)
Acadian Asset Management LLC292,064$37munder 0.1%Added+123,15713 Aug 2026 (the filing on sec.gov)
Neuberger Berman Group LLC290,384$37munder 0.1%Trimmed-70,36727 Oct 2026 (the filing on sec.gov)
Millennium Management LLC157,057$20munder 0.1%Trimmed-217,40614 Aug 2026 (the filing on sec.gov)
Point72 Asset Management LP123,262$16munder 0.1%Trimmed-254,35614 Aug 2026 (the filing on sec.gov)
D. E. Shaw & Co.109,823$14munder 0.1%Newnew14 Aug 2026 (the filing on sec.gov)
Tudor Investment Corp75,389$9.5munder 0.1%Added+38,18114 Aug 2026 (the filing on sec.gov)
Two Sigma Investments LP65,892$8.3munder 0.1%Trimmed-113,31014 Aug 2026 (the filing on sec.gov)
Woodline Partners LP64,861$8.2munder 0.1%Added+7,00114 Aug 2026 (the filing on sec.gov)
Walleye Capital LLC62,613$7.9munder 0.1%Trimmed-57,2513 Aug 2026 (the filing on sec.gov)
Schonfeld Strategic Advisors LLC39,438$5.0munder 0.1%Trimmed-209,44814 Aug 2026 (the filing on sec.gov)
Janus Henderson Group Ltd33,266$4.2munder 0.1%Held014 Aug 2026 (the filing on sec.gov)
Susquehanna International Group LLP23,476$3.0munder 0.1%Trimmed-78,60414 Aug 2026 (the filing on sec.gov)
Squarepoint Ops LLC14,389$1.8munder 0.1%Trimmed-67,25114 Aug 2026 (the filing on sec.gov)
Renaissance Technologies LLC7,700$973kunder 0.1%Added+5,30013 Aug 2026 (the filing on sec.gov)
Balyasny Asset Management LLC6,749$852kunder 0.1%Trimmed-121,94314 Aug 2026 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q1 2026 to Q2 2026, among managers that listed it in both quarters or opened it.

Increases

Reductions

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (4)

Exited (3)

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.
6 in Q3 2024 to 6 in Q2 2026

Tracked managers listing it, at least.

051015201620182020202220242026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
IRM by quarter
QuarterHoldersReported valueBuyersSellers
Q1 20154$1.2bnn.a.n.a.
Q2 20156$1.1bnn.a.n.a.
Q3 20154$1.3bnn.a.n.a.
Q4 20156$1.1bnn.a.n.a.
Q1 20164$1.4bnn.a.n.a.
Q2 20166$1.2bnn.a.n.a.
Q3 20164$1.1bnn.a.n.a.
Q4 20162$885mn.a.n.a.
Q1 20175$1.4bnn.a.n.a.
Q2 20175$1.3bnn.a.n.a.
Q3 20176$1.5bnn.a.n.a.
Q4 20176$1.3bnn.a.n.a.
Q1 20186$1.2bnn.a.n.a.
Q2 20183$1.3bnn.a.n.a.
Q3 20186$1.3bnn.a.n.a.
Q4 20184$1.3bnn.a.n.a.
Q1 201912$1.6bnn.a.n.a.
Q2 20196$1.3bnn.a.n.a.
Q3 20198$1.4bnn.a.n.a.
Q4 20195$1.2bnn.a.n.a.
Q1 20207$975mn.a.n.a.
Q2 20202$920mn.a.n.a.
Q3 20203$951mn.a.n.a.
Q4 20203$865mn.a.n.a.
Q1 20212$1.2bnn.a.n.a.
Q2 20212$1.4bnn.a.n.a.
Q3 20212$1.4bnn.a.n.a.
Q4 20213$2.0bnn.a.n.a.
Q1 20222$1.7bnn.a.n.a.
Q2 20223$1.4bnn.a.n.a.
Q3 20225$1.3bnn.a.n.a.
Q4 20225$1.6bnn.a.n.a.
Q1 20233$1.4bnn.a.n.a.
Q2 20234$1.2bnn.a.n.a.
Q3 20237$1.6bnn.a.n.a.
Q4 20239$892m63
Q1 202410$758m55
Q2 20246$811m35
Q3 20246$956m33
Q4 202410$856m63
Q1 202511$1.1bn65
Q2 202511$1.8bn55
Q3 20256$1.7bn41
Q4 20256$1.3bn1610
Q1 20269$1.7bn1614
Q2 20266$2.0bn1317

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

IRM and WELL →IRM and EQIX →IRM and PLD →Choose a stock to compare with IRM →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own IRM, latest filings →Back to the 13F Explorer →