ARTHUR J GALLAGHER & CO (AJG) Stock Institutional Trading Activity


ARTHUR J GALLAGHER & CO (AJG) 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, Viking Global Investors, Ariel Appreciation Fund, Sequoia Financial Advisors, and Torray Fund. 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
Q4 2025Renaissance Technologies LLCSell-396,1804,320$1,117,973
Q4 2025Ariel Appreciation FundBuy1,71215,357$3,974,238
Q4 2025Viking Global InvestorsBuy315,1821,040,977$269,394,438
Q3 2025Torray FundBuy5,32524,387$7,553,629
Q3 2025Ariel Appreciation FundBuy13,64513,645$4,226,402
Q3 2025Sequoia Financial AdvisorsBuy5,878127,661$39,541,587
Q3 2025Renaissance Technologies LLCBuy50,900400,500$124,050,870
Q2 2025Torray FundSell-1,34919,062$6,102,127
Q2 2025Mairs & Power Growth FundSell-40760$243,291
Q2 2025Sequoia Financial AdvisorsBuy4,992121,783$38,985,025
Q2 2025Renaissance Technologies LLCBuy30,600349,600$111,913,952
Q2 2025Viking Global InvestorsBuy59,243725,795$232,341,495
Q1 2025Torray FundSell-66020,411$7,046,694
Q1 2025Mairs & Power Growth FundSell-976800$276,192
Q1 2025Sequoia Financial AdvisorsBuy36,113116,791$40,320,862
Q1 2025Renaissance Technologies LLCBuy145,800319,000$110,131,560
Q1 2025Viking Global InvestorsSell-291,268666,552$230,120,412
Q4 2024Torray FundBuy22221,071$5,981,003
Q4 2024Mairs & Power Growth FundBuy2761,776$504,118
Q4 2024Sequoia Financial AdvisorsBuy15,34080,678$22,900,341
Q4 2024Renaissance Technologies LLCBuy82,500173,200$49,162,820
Q3 2024Torray FundSell-16420,849$5,866,283
Q3 2024Mairs & Power Growth FundBuy1,5001,500$422,055
Q3 2024Sequoia Financial AdvisorsBuy17,89465,338$18,384,226
Q3 2024Renaissance Technologies LLCBuy14,30090,700$25,520,259
Q2 2024Torray FundSell-55,00121,013$5,448,881
Q2 2024Sequoia Financial AdvisorsBuy4,25847,444$12,302,612
Q1 2024Torray FundBuy55,05076,014$5,231,837
Q1 2024Renaissance Technologies LLCBuy55,60076,400$19,103
Q1 2024Sequoia Financial AdvisorsSell-7,08843,186$10,798,152

Frequently asked questions about AJG activity

  • Which institutional owners are buying AJG?

    Institutional owners buying AJG 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 AJG activity?

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

  • Is institutional interest in AJG increasing?

    Institutional interest in AJG 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.