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.
| Institution | Type | Change in shares | Change Position % | Shares | Reported stock balance | Portfolio quarter | Filing date |
|---|---|---|---|---|---|---|---|
| Manufacturers Life Insurance Company, The | Buy | +47,795 | — | 47,795 | $179.23K | Q2 2026 | Sep 09, 2026 |
| Citadel Advisors Llc | Sell | -2,295,684 | -42.5% | 3,110,509 | $11.66M | Q2 2026 | Sep 02, 2026 |
| California State Teachers Retirement System | Buy | +120,098 | +135.9% | 208,477 | $781.79K | Q2 2026 | Aug 24, 2026 |
| Seven Fleet Capital Management Lp | Buy | +714,000 | +192.2% | 1,085,398 | $4.07M | Q2 2026 | Aug 17, 2026 |
| Stonepine Capital Management, Llc | Buy | +205,000 | — | 205,000 | $768.75K | Q2 2026 | Aug 17, 2026 |
| Kynam Capital Management, Lp | Buy | +6,690,000 | +44.6% | 21,703,093 | $81.39M | Q2 2026 | Aug 14, 2026 |
| Venrock Adviser, Llc | Sell | -5,000,000 | -50.1% | 4,982,124 | $18.68M | Q2 2026 | Aug 14, 2026 |
| Bank Of America Corp | Buy | +4,879,832 | +47.8% | 15,082,617 | $56.56M | Q2 2026 | Aug 14, 2026 |
| Millennium Management Llc | Sell | -1,974,360 | -53.9% | 1,685,830 | $6.32M | Q2 2026 | Aug 14, 2026 |
| Susquehanna International Group, Llp | Sell | -1,778,942 | -95.2% | 90,673 | $340.02K | Q2 2026 | Aug 14, 2026 |
| Wellington Management Group Llp | Buy | +1,585,976 | +44.3% | 5,168,961 | $19.38M | Q2 2026 | Aug 14, 2026 |
| Two Sigma Investments, Lp | Buy | +1,422,487 | +52.5% | 4,132,643 | $15.50M | Q2 2026 | Aug 14, 2026 |
| Tudor Investment Corp Et Al | Buy | +1,380,687 | — | 1,380,687 | $5.18M | Q2 2026 | Aug 14, 2026 |
| Sphera Funds Management Ltd. | Buy | +659,000 | +299.5% | 879,000 | $3.30M | Q2 2026 | Aug 14, 2026 |
| Goldman Sachs Group Inc | Buy | +543,813 | +37.3% | 2,003,652 | $7.51M | Q2 2026 | Aug 14, 2026 |
| Qube Research & Technologies Ltd | Sell | -425,019 | -18.9% | 1,824,564 | $6.84M | Q2 2026 | Aug 14, 2026 |
| Charles Schwab Investment Management Inc | Buy | +421,079 | +326.9% | 549,875 | $2.06M | Q2 2026 | Aug 14, 2026 |
| Velan Capital Investment Management Lp | Sell | -420,000 | -77.8% | 120,000 | $450.00K | Q2 2026 | Aug 14, 2026 |
| Gilder Gagnon Howe & Co Llc | Sell | -415,886 | -37.1% | 704,423 | $2.64M | Q2 2026 | Aug 14, 2026 |
| 683 Capital Management, Llc | Sell | -405,000 | -95.3% | 20,000 | $75.00K | Q2 2026 | Aug 14, 2026 |
| Eversept Partners, Lp | Buy | +369,983 | +11.6% | 3,558,497 | $13.34M | Q2 2026 | Aug 14, 2026 |
| Perceptive Advisors Llc | Buy | +340,361 | +3.4% | 10,439,185 | $39.15M | Q2 2026 | Aug 14, 2026 |
| Caption Management, Llc | Sell | -273,224 | -47.7% | 300,000 | $1.13M | Q2 2026 | Aug 14, 2026 |
| Invesco Ltd. | Buy | +220,205 | — | 220,205 | $825.77K | Q2 2026 | Aug 14, 2026 |
| Dafna Capital Management Llc | Buy | +208,407 | +90.6% | 438,407 | $1.64M | Q2 2026 | Aug 14, 2026 |
| Sei Investments Co | Sell | -207,749 | -83.7% | 40,499 | $151.87K | Q2 2026 | Aug 14, 2026 |
| Wells Fargo & Company/Mn | Buy | +156,588 | +2374.3% | 163,183 | $611.94K | Q2 2026 | Aug 14, 2026 |
| Price T Rowe Associates Inc | Buy | +148,107 | — | 148,107 | $556.00K | Q2 2026 | Aug 14, 2026 |
| Verdad Advisers, Lp | Buy | +146,220 | +484.4% | 176,407 | $661.53K | Q2 2026 | Aug 14, 2026 |
| Squarepoint Ops Llc | Sell | -129,063 | -53.5% | 112,152 | $420.57K | Q2 2026 | Aug 14, 2026 |
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.
Related CTMX Institutional Insights
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