Ticker · held by 3 filers

IRM

IRON MTN INC DEL

All tracked filers currently holding IRM, ranked by position size. Each row links through to the filer's full portfolio.

Total value held

$2.64B

Total shares

29,607,431

Filers holding

3 · 5 positions

Caveat

long only · 13F-eligible managers only

Filers holding IRM

sorted by position size · click any filer to see their full portfolio

# Filer Class Shares Value (USD) % of port

1 BlackRock · Larry Fink COM 27,891,960 $2.50B 0.06%

2 Citadel Advisors · Ken Griffin COM 1,119,371 $92.9M 0.01%

3 Soros Fund Management · George Soros / Robert Soros CALLCOM 327,700 $27.2M 0.31%

4 Citadel Advisors · Ken Griffin CALLCOM 177,900 $14.8M 0.00%

5 Citadel Advisors · Ken Griffin PUTCOM 90,500 $7.5M 0.00%

What this is

This page reverses the usual 13F view: instead of "what does Buffett hold," it answers "who holds NVDA?" Across the dozen tracked filers, all current 13F-disclosed holders of IRM are listed, with the position size and what fraction of each filer's overall portfolio it represents.

Caveats: only the filers tracked here are included (~12 names) — not the whole 13F universe (~6,000 filers). Position values are at the most recent quarter-end, not current market price. Only long positions are visible; shorts and synthetics aren't.

v0.2 · 2026 · data via SEC EDGAR · CUSIP→ticker via OpenFIGI