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Ticker · held by 4 filers

ROCK

GIBRALTAR INDS INC

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

Total value held
$374.4M
Total shares
5,500,168
Filers holding
4
Caveat
long only · 13F-eligible managers only
Filers holding ROCK
# Filer Class Shares Value (USD) % of port
1 BlackRock · Larry Fink COM 5,361,581 $367.5M 0.01%
2 Citadel Advisors · Ken Griffin COM 93,317 $4.6M 0.00%
3 Renaissance Technologies · Jim Simons (founder) COM 39,100 $1.9M 0.00%
4 Bridgewater Associates · Ray Dalio (founder) COM 6,170 $305.0K 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 ROCK 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