CYTOMX THERAPEUTICS INC (CTMX) Institutional Ownership Changes & 13F Activity

CYTOMX THERAPEUTICS INC (CTMX). 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 Kynam Capital Management, Lp, Venrock Adviser, Llc, Bank Of America Corp, Citadel Advisors Llc, and Millennium Management Llc.

InstitutionTypeChange in sharesChange Position %SharesReported stock balancePortfolio quarterFiling date
Manufacturers Life Insurance Company, TheBuy+47,79547,795$179.23KQ2 2026Sep 09, 2026
Citadel Advisors LlcSell-2,295,684-42.5%3,110,509$11.66MQ2 2026Sep 02, 2026
California State Teachers Retirement SystemBuy+120,098+135.9%208,477$781.79KQ2 2026Aug 24, 2026
Seven Fleet Capital Management LpBuy+714,000+192.2%1,085,398$4.07MQ2 2026Aug 17, 2026
Stonepine Capital Management, LlcBuy+205,000205,000$768.75KQ2 2026Aug 17, 2026
Kynam Capital Management, LpBuy+6,690,000+44.6%21,703,093$81.39MQ2 2026Aug 14, 2026
Venrock Adviser, LlcSell-5,000,000-50.1%4,982,124$18.68MQ2 2026Aug 14, 2026
Bank Of America CorpBuy+4,879,832+47.8%15,082,617$56.56MQ2 2026Aug 14, 2026
Millennium Management LlcSell-1,974,360-53.9%1,685,830$6.32MQ2 2026Aug 14, 2026
Susquehanna International Group, LlpSell-1,778,942-95.2%90,673$340.02KQ2 2026Aug 14, 2026
Wellington Management Group LlpBuy+1,585,976+44.3%5,168,961$19.38MQ2 2026Aug 14, 2026
Two Sigma Investments, LpBuy+1,422,487+52.5%4,132,643$15.50MQ2 2026Aug 14, 2026
Tudor Investment Corp Et AlBuy+1,380,6871,380,687$5.18MQ2 2026Aug 14, 2026
Sphera Funds Management Ltd.Buy+659,000+299.5%879,000$3.30MQ2 2026Aug 14, 2026
Goldman Sachs Group IncBuy+543,813+37.3%2,003,652$7.51MQ2 2026Aug 14, 2026
Qube Research & Technologies LtdSell-425,019-18.9%1,824,564$6.84MQ2 2026Aug 14, 2026
Charles Schwab Investment Management IncBuy+421,079+326.9%549,875$2.06MQ2 2026Aug 14, 2026
Velan Capital Investment Management LpSell-420,000-77.8%120,000$450.00KQ2 2026Aug 14, 2026
Gilder Gagnon Howe & Co LlcSell-415,886-37.1%704,423$2.64MQ2 2026Aug 14, 2026
683 Capital Management, LlcSell-405,000-95.3%20,000$75.00KQ2 2026Aug 14, 2026
Eversept Partners, LpBuy+369,983+11.6%3,558,497$13.34MQ2 2026Aug 14, 2026
Perceptive Advisors LlcBuy+340,361+3.4%10,439,185$39.15MQ2 2026Aug 14, 2026
Caption Management, LlcSell-273,224-47.7%300,000$1.13MQ2 2026Aug 14, 2026
Invesco Ltd.Buy+220,205220,205$825.77KQ2 2026Aug 14, 2026
Dafna Capital Management LlcBuy+208,407+90.6%438,407$1.64MQ2 2026Aug 14, 2026
Sei Investments CoSell-207,749-83.7%40,499$151.87KQ2 2026Aug 14, 2026
Wells Fargo & Company/MnBuy+156,588+2374.3%163,183$611.94KQ2 2026Aug 14, 2026
Price T Rowe Associates IncBuy+148,107148,107$556.00KQ2 2026Aug 14, 2026
Verdad Advisers, LpBuy+146,220+484.4%176,407$661.53KQ2 2026Aug 14, 2026
Squarepoint Ops LlcSell-129,063-53.5%112,152$420.57KQ2 2026Aug 14, 2026
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Frequently asked questions about CTMX activity

  • Which institutional owners are buying CTMX?

    Institutional owners buying CTMX 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 CTMX activity?

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

  • Is institutional interest in CTMX increasing?

    Institutional interest in CTMX 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.