Stock Ownership/ROCK

GIBRALTAR INDS INC (ROCK): Ownership & Insider Activity

Hedge funds and institutional managers reporting a position in ROCK · Industrials. Based on the most recent 13F filing from each holder, sourced from SEC EDGAR.

Reported Holders
17
13F filers
Aggregate Value
$64.1M
Across holders
Last Price
$46.27
2026-08-24
Sector
Industrials
GICS
Quarterly fund activity14 increased2 reduced4 exited
Full exits: Bridgewater Associates, LP, TWO SIGMA INVESTMENTS, LP, Holocene Advisors, LP, ARROWSTREET CAPITAL, LIMITED PARTNERSHIP
Institutional Holders of ROCK
↗
17 holders
Manager⇅Type⇅Shares⇅Market Value▼% of Total⇅% of Portfolio⇅Action⇅QoQ Change⇅Quarter⇅
BALYASNY ASSET MANAGEMENT LLC
CIK 0001218710
Hedge Fund243K$11.0M17.1%0.0%Added+$5.7MQ2 2026
SHAW D E & CO INC
CIK 0001009207
Hedge Fund225K$10.1M15.8%0.0%Reduced$-12.4MQ2 2026
CITADEL ADVISORS LLC
CIK 0001423053
Hedge Fund191K$8.6M13.4%0.0%Added$-2.1MQ2 2026
AQR CAPITAL MANAGEMENT LLC
CIK 0001167557
Hedge Fund160K$7.2M11.2%0.0%Added+$7.2MQ2 2026
GAMCO INVESTORS, INC. ET AL
CIK 0000807249
Institutional Manager97K$4.4M6.8%0.0%Reduced$-414KQ2 2026
PRIMECAP MANAGEMENT CO/CA/
CIK 0000763212
Institutional Manager96K$4.3M6.7%0.0%Unchanged+$0Q2 2026
Man Group plc
CIK 0001637460
Hedge Fund83K$3.8M5.9%0.0%Added—Q2 2026
Squarepoint Ops LLC
CIK 0001642575
Hedge Fund83K$3.7M5.8%0.0%Added—Q2 2026
RENAISSANCE TECHNOLOGIES LLC
CIK 0001037389
Hedge Fund67K$3.0M4.7%0.0%Added+$2.3MQ2 2026
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
Hedge Fund57K$2.6M4.0%0.0%Added—Q2 2026
BALYASNY ASSET MANAGEMENT LLCAdded
Hedge Fund
$11.0M· 17.1% of total· 0.0% port· 243K sh· +$5.7M QoQ· Q2 2026
SHAW D E & CO INCReduced
Hedge Fund
$10.1M· 15.8% of total· 0.0% port· 225K sh· $-12.4M QoQ· Q2 2026
CITADEL ADVISORS LLCAdded
Hedge Fund
$8.6M· 13.4% of total· 0.0% port· 191K sh· $-2.1M QoQ· Q2 2026
AQR CAPITAL MANAGEMENT LLCAdded
Hedge Fund
$7.2M· 11.2% of total· 0.0% port· 160K sh· +$7.2M QoQ· Q2 2026
GAMCO INVESTORS, INC. ET ALReduced
Institutional Manager
$4.4M· 6.8% of total· 0.0% port· 97K sh· $-414K QoQ· Q2 2026
PRIMECAP MANAGEMENT CO/CA/Unchanged
Institutional Manager
$4.3M· 6.7% of total· 0.0% port· 96K sh· +$0 QoQ· Q2 2026
Man Group plcAdded
Hedge Fund
$3.8M· 5.9% of total· 0.0% port· 83K sh· — QoQ· Q2 2026
Squarepoint Ops LLCAdded
Hedge Fund
$3.7M· 5.8% of total· 0.0% port· 83K sh· — QoQ· Q2 2026
RENAISSANCE TECHNOLOGIES LLCAdded
Hedge Fund
$3.0M· 4.7% of total· 0.0% port· 67K sh· +$2.3M QoQ· Q2 2026
MILLENNIUM MANAGEMENT LLCAdded
Hedge Fund
$2.6M· 4.0% of total· 0.0% port· 57K sh· — QoQ· Q2 2026
MARSHALL WACE, LLPAdded
Hedge Fund
$2.0M· 3.0% of total· 0.0% port· 43K sh· +$1.5M QoQ· Q2 2026
CAXTON ASSOCIATES LLPAdded
Hedge Fund
$1.4M· 2.2% of total· 0.0% port· 32K sh· +$56K QoQ· Q2 2026
ExodusPoint Capital Management, LPAdded
Hedge Fund
$924K· 1.4% of total· 0.0% port· 20K sh· — QoQ· Q2 2026
Lighthouse Investment Partners, LLCAdded
Hedge Fund
$631K· 1.0% of total· 0.0% port· 14K sh· — QoQ· Q2 2026
Brevan Howard Capital Management LPAdded
Hedge Fund
$480K· 0.7% of total· 0.0% port· 11K sh· +$201K QoQ· Q2 2026
Rockefeller Capital Management L.P.Added
Hedge Fund
$32K· 0.0% of total· 0.0% port· 705 sh· +$32K QoQ· Q2 2026
Fulcrum Asset Management LLPAdded
Hedge Fund
$2K· 0.0% of total· 0.0% port· 34 sh· — QoQ· Q2 2026
1–10 of 17
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