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
Q1 2019Renaissance Technologies LLCBuy230,300367,400$28,694
Q1 2019Viking Global InvestorsSell-724,969475,830$37,162
Q4 2018Viking Global InvestorsSell-35,0501,200,799$88,499
Q3 2018Renaissance Technologies LLCSell-295,200137,100$10,206
Q3 2018Viking Global InvestorsSell-499,1601,235,849$91,997
Q2 2018Viking Global InvestorsBuy361,4411,735,009$113,261
Q1 2018Renaissance Technologies LLCBuy102,700432,300$29,712
Q1 2018Viking Global InvestorsBuy1,373,5681,373,568$94,405
Q4 2017Renaissance Technologies LLCBuy11,200329,600$20,857
Q3 2017Renaissance Technologies LLCSell-89,600318,400$19,598
Q2 2017Renaissance Technologies LLCBuy368,300408,000$23,358
Q1 2017Renaissance Technologies LLCSell-433,50039,700$2,245
Q4 2016Renaissance Technologies LLCBuy408,300473,200$24,587
Q2 2016Renaissance Technologies LLCSell-100,80064,900$3,089
Q1 2016Renaissance Technologies LLCBuy88,300165,700$7,370
Q4 2015Renaissance Technologies LLCSell-432,70077,400$3,169
Q3 2015Renaissance Technologies LLCBuy411,700510,100$21,057
Q2 2015Renaissance Technologies LLCSell-436,60098,400$4,654
Q1 2015Renaissance Technologies LLCSell-165,000535,000$25,011
Q4 2014Renaissance Technologies LLCBuy583,200700,000$32,956
Q3 2014Renaissance Technologies LLCBuy112,300116,800$5,298
Q2 2014Renaissance Technologies LLCSell-158,9014,500$210
Q1 2014Renaissance Technologies LLCSell-372,399163,401$7,775
Q4 2013Renaissance Technologies LLCSell-46,900535,800$25,145
Q3 2013Renaissance Technologies LLCBuy281,300582,700$25,435
Q2 2013Tweedy, Browne Co All Funds (US)Buy63,72363,723$2,784
Q2 2013Renaissance Technologies LLCBuy301,400301,400$13,168

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.