GIBRALTAR INDUSTRIES INC (ROCK) Stock Institutional Trading Activity


GIBRALTAR INDUSTRIES INC (ROCK) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q4 2025), investors with some of the largest reported share count changes include Renaissance Technologies LLC, First Eagle U.S. Value, and Hancock Classic Value. Explore insights into buying and selling patterns, position changes, and investment conviction levels to understand institutional trading behavior and market dynamics.

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Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q3 2021Renaissance Technologies LLCSell-49,300289,004$20,129
Q2 2021First Eagle U.S. ValueBuy400400$31
Q2 2021Renaissance Technologies LLCSell-96,500338,304$25,816
Q1 2021Renaissance Technologies LLCSell-93,996434,804$39,789
Q4 2020Renaissance Technologies LLCSell-128,704528,800$38,042
Q3 2020Renaissance Technologies LLCSell-52,196657,504$42,830
Q2 2020Renaissance Technologies LLCBuy83,296709,700$34,073
Q1 2020Renaissance Technologies LLCBuy18,400626,404$26,885
Q4 2019Renaissance Technologies LLCBuy234,600608,004$30,668
Q4 2019Hancock Classic ValueSell-587,703217,340$10,963
Q3 2019Renaissance Technologies LLCBuy69,004373,404$17,154
Q3 2019Hancock Classic ValueSell-226,517805,043$36,984
Q2 2019Renaissance Technologies LLCBuy90,347304,400$12,286
Q2 2019Hancock Classic ValueSell-32,5881,031,560$41,634
Q1 2019Renaissance Technologies LLCBuy135,853214,053$8,693
Q1 2019Hancock Classic ValueSell-167,2161,064,148$43,215
Q4 2018Renaissance Technologies LLCSell-117,10078,200$2,783
Q4 2018Hancock Classic ValueBuy136,0351,231,364$43,824
Q3 2018Renaissance Technologies LLCSell-390,200195,300$8,906
Q3 2018Hancock Classic ValueSell-474,5641,095,329$49,947
Q2 2018Hancock Classic ValueBuy38,7861,569,893$58,871
Q1 2018Renaissance Technologies LLCSell-303,453585,500$19,819
Q1 2018Hancock Classic ValueSell-232,9531,531,107$51,828
Q4 2017Renaissance Technologies LLCSell-223,900888,953$29,335
Q4 2017Hancock Classic ValueSell-88,7781,764,060$58,214
Q3 2017Renaissance Technologies LLCBuy63,5531,112,853$34,665
Q3 2017Hancock Classic ValueBuy1,059,1751,852,838$57,716
Q2 2017Renaissance Technologies LLCSell-134,5271,049,300$37,408
Q2 2017Hancock Classic ValueBuy783,423793,663$28,294
Q1 2017Renaissance Technologies LLCSell-80,7731,183,827$48,774

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.