SYNDAX PHARMACEUTICALS INC (SNDX) Institutional Ownership Changes & 13F Activity

SYNDAX PHARMACEUTICALS INC (SNDX). 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 Millennium Management Llc, Loomis Sayles & Co L P, Goldman Sachs Group Inc, Orbimed Advisors Llc, and Qube Research & Technologies Ltd.

InstitutionTypeChange in sharesChange Position %SharesReported stock balancePortfolio quarterFiling date
Manufacturers Life Insurance Company, TheBuy+4,401+11.0%44,305$968.51KQ2 2026Sep 09, 2026
Citadel Advisors LlcSell-372,664-59.1%258,278$5.65MQ2 2026Sep 02, 2026
Allianz Asset Management GmbhBuy+9,3009,300$203.30KQ2 2026Sep 02, 2026
California State Teachers Retirement SystemSell-9,528-9.2%93,481$2.04MQ2 2026Aug 24, 2026
Mercer Global Advisors IncSell-5,147-21.8%18,490$404.19KQ2 2026Aug 19, 2026
Seven Fleet Capital Management LpBuy+77,93077,930$1.65MQ2 2026Aug 17, 2026
Millennium Management LlcBuy+1,854,436+929.4%2,053,960$44.90MQ2 2026Aug 14, 2026
Loomis Sayles & Co L PBuy+923,624923,624$20.19MQ2 2026Aug 14, 2026
Goldman Sachs Group IncBuy+864,478+17.3%5,861,265$128.13MQ2 2026Aug 14, 2026
Orbimed Advisors LlcBuy+579,700+60.2%1,542,000$33.71MQ2 2026Aug 14, 2026
Qube Research & Technologies LtdBuy+441,135+1223.8%477,182$10.43MQ2 2026Aug 14, 2026
Prosight Management, LpBuy+430,000+55.8%1,200,000$26.23MQ2 2026Aug 14, 2026
Trails Edge Capital Partners, LpBuy+408,179+58.2%1,110,000$24.26MQ2 2026Aug 14, 2026
D. E. Shaw & Co., Inc.Sell-361,942-22.6%1,239,954$27.11MQ2 2026Aug 14, 2026
Ameriprise Financial IncBuy+346,852346,852$7.58MQ2 2026Aug 14, 2026
Alyeska Investment Group, L.P.Buy+308,507308,507$6.74MQ2 2026Aug 14, 2026
Verition Fund Management LlcBuy+304,939304,939$6.67MQ2 2026Aug 14, 2026
Sphera Funds Management Ltd.Buy+290,043+40.0%1,014,606$22.18MQ2 2026Aug 14, 2026
Hrt Financial LpBuy+274,243+308.5%363,147$7.94MQ2 2026Aug 14, 2026
Susquehanna International Group, LlpBuy+257,480+131.0%454,101$9.93MQ2 2026Aug 14, 2026
Hood River Capital Management LlcBuy+209,994+8.9%2,564,279$56.06MQ2 2026Aug 14, 2026
Bank Of America CorpSell-204,742-4.8%4,045,094$88.43MQ2 2026Aug 14, 2026
Squarepoint Ops LlcBuy+188,765+104.0%370,317$8.10MQ2 2026Aug 14, 2026
Alliancebernstein L.P.Sell-182,527-63.3%106,040$2.48MQ2 2026Aug 14, 2026
Catalio Capital Management, LpBuy+172,028+16.5%1,215,698$26.58MQ2 2026Aug 14, 2026
Granahan Investment Management, LlcBuy+140,667+45.9%446,988$9.77MQ2 2026Aug 14, 2026
Invesco Ltd.Buy+138,060138,060$3.02MQ2 2026Aug 14, 2026
Aqr Capital Management LlcSell-127,010-13.0%853,304$18.65MQ2 2026Aug 14, 2026
Pfm Health Sciences, LpSell-126,599-51.7%118,422$2.59MQ2 2026Aug 14, 2026
Ensign Peak Advisors, IncSell-123,138-12.4%867,831$18.97MQ2 2026Aug 14, 2026
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Frequently asked questions about SNDX activity

  • Which institutional owners are buying SNDX?

    Institutional owners buying SNDX 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 SNDX activity?

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

  • Is institutional interest in SNDX increasing?

    Institutional interest in SNDX 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.