GIBRALTAR INDUSTRIES INC (ROCK) Institutional Ownership Changes & 13F Activity

GIBRALTAR INDUSTRIES INC (ROCK). Institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC Form 13F filings (Q2 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions in the latest reporting period. Notable filers include Simcoe Capital Management, Llc, First Wilshire Securities Management Inc, Palisade Capital Management, Lp, Invesco Ltd., and Frontier Capital Management Co Llc.

InstitutionTypeChange in sharesChange Position %SharesReported stock balancePortfolio quarterFiling date
Envestnet Asset Management IncBuy+2,979+36.9%11,054$498.52KQ2 2026Sep 23, 2026
State Street CorpSell-116,681-8.7%1,228,984$55.41MQ2 2026Sep 22, 2026
Manufacturers Life Insurance Company, TheBuy+57+0.4%13,092$590.45KQ2 2026Sep 09, 2026
Parkside Financial Bank & TrustSell-113-6.7%1,574$70.99KQ2 2026Sep 04, 2026
Citadel Advisors LlcBuy+72,658+61.3%191,107$8.62MQ2 2026Sep 02, 2026
Corient Private Wealth LlcSell-7,728-25.0%23,242$1.05MQ2 2026Aug 27, 2026
California State Teachers Retirement SystemBuy+5,661+20.4%33,404$1.51MQ2 2026Aug 24, 2026
Assenagon Asset Management S.A.Sell-33,462-67.4%16,197$730.49KQ2 2026Aug 21, 2026
Mercer Global Advisors IncBuy+4,7324,732$213.41KQ2 2026Aug 19, 2026
Fulcrum Asset Management LlpBuy+3434$1.52KQ2 2026Aug 18, 2026
Public Employees Retirement System Of OhioBuy+211+25.8%1,029$46.41KQ2 2026Aug 17, 2026
Simcoe Capital Management, LlcBuy+494,365494,365$22.30MQ2 2026Aug 14, 2026
First Wilshire Securities Management IncSell-231,150-46.2%268,773$12.12MQ2 2026Aug 14, 2026
Palisade Capital Management, LpSell-190,444-53.1%168,431$7.60MQ2 2026Aug 14, 2026
Invesco Ltd.Buy+144,410144,410$6.51MQ2 2026Aug 14, 2026
Frontier Capital Management Co LlcBuy+142,000+20.6%830,272$37.45MQ2 2026Aug 14, 2026
Balyasny Asset Management L.P.Buy+126,627+108.4%243,403$10.98MQ2 2026Aug 14, 2026
Royce & Associates LpBuy+113,824+39.4%402,365$18.15MQ2 2026Aug 14, 2026
Monimus Capital Management, LpBuy+91,93991,939$4.15MQ2 2026Aug 14, 2026
Ameriprise Financial IncBuy+87,54687,546$3.95MQ2 2026Aug 14, 2026
Man Group PlcBuy+83,28283,282$3.76MQ2 2026Aug 14, 2026
Squarepoint Ops LlcBuy+83,14883,148$3.75MQ2 2026Aug 14, 2026
Susquehanna International Group, LlpBuy+70,441+455.3%85,913$3.87MQ2 2026Aug 14, 2026
Goldman Sachs Group IncSell-69,597-35.7%125,116$5.64MQ2 2026Aug 14, 2026
Aqr Capital Management LlcBuy+63,553+66.2%159,586$7.20MQ2 2026Aug 14, 2026
Mirae Asset Global Etfs Holdings Ltd.Buy+63,353+8.5%805,620$36.33MQ2 2026Aug 14, 2026
Millennium Management LlcBuy+56,57356,573$2.55MQ2 2026Aug 14, 2026
Lazard Asset Management LlcBuy+47,270+384.9%59,550$2.69MQ2 2026Aug 14, 2026
Alliancebernstein L.P.Buy+34,379+1.6%2,232,832$89.02MQ2 2026Aug 14, 2026
Castleknight Management LpSell-28,000-18.6%122,500$5.52MQ2 2026Aug 14, 2026
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Frequently asked questions about ROCK activity

  • Which institutional owners are buying ROCK?

    Institutional owners buying ROCK include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in ROCK activity?

    "Buy" means an investor increased their reported position in ROCK compared to the prior reporting period. This reflects growing exposure to GIBRALTAR INDUSTRIES INC (ROCK) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in ROCK increasing?

    Institutional interest in ROCK can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.