ACADIA PHARMACEUTICALS INC (ACAD) Stock Institutional Trading Activity


ACADIA PHARMACEUTICALS INC (ACAD) 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, Thunderbird Partners, and Viking Global Investors. 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 LLCBuy83,0631,532,596$40,935,639
Q3 2025Renaissance Technologies LLCSell-98,1991,449,533$30,933,034
Q2 2025Renaissance Technologies LLCBuy70,6991,547,732$33,384,579
Q1 2025Renaissance Technologies LLCBuy250,5001,477,033$24,533,518
Q4 2024Renaissance Technologies LLCBuy823,3331,226,533$22,506,881
Q3 2024Renaissance Technologies LLCSell-72,800403,200$6,201,216
Q2 2024Renaissance Technologies LLCSell-97,800476,000$7,735,000
Q1 2024Renaissance Technologies LLCBuy389,800573,800$10,610
Q4 2023Renaissance Technologies LLCBuy53,200184,000$5,761
Q2 2023Renaissance Technologies LLCBuy13,000130,800$3,133
Q1 2023Renaissance Technologies LLCSell-197,900117,800$2,217
Q4 2022Renaissance Technologies LLCBuy278,000315,700$5,026
Q3 2022Renaissance Technologies LLCBuy23,20037,700$617
Q1 2022Renaissance Technologies LLCSell-566,50014,500$351
Q1 2022Thunderbird PartnersBuy692,825692,825$16,780
Q1 2021Renaissance Technologies LLCBuy398,600581,000$14,990
Q4 2020Renaissance Technologies LLCSell-87,100182,400$9,751
Q3 2020Renaissance Technologies LLCBuy157,300269,500$11,117
Q2 2020Renaissance Technologies LLCBuy51,400112,200$5,438
Q1 2020Renaissance Technologies LLCSell-670,20060,800$2,569
Q4 2019Renaissance Technologies LLCBuy645,200731,000$31,272
Q3 2019Renaissance Technologies LLCSell-512,00085,800$3,088
Q4 2018Renaissance Technologies LLCBuy425,500597,800$9,666
Q3 2018Renaissance Technologies LLCBuy172,300172,300$3,577
Q4 2014Viking Global InvestorsSell-1,368,6242,956,266$93,861
Q3 2014Viking Global InvestorsSell-432,9884,324,890$107,084
Q2 2014Viking Global InvestorsBuy1,159,4714,757,878$107,480
Q1 2014Viking Global InvestorsBuy967,7623,598,407$87,549
Q4 2013Viking Global InvestorsBuy2,630,6452,630,645$65,739

Frequently asked questions about ACAD activity

  • Which institutional owners are buying ACAD?

    Institutional owners buying ACAD 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 ACAD activity?

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

  • Is institutional interest in ACAD increasing?

    Institutional interest in ACAD 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.