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 (Q1 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions in the latest reporting period. Notable filers include Bank Of America Corp, Fmr Llc, Kynam Capital Management, Lp, Venrock Adviser, Llc, and Citadel Advisors Llc.
| Institution | Type | Change in shares | Change Position % | Shares | Reported stock balance | Portfolio quarter | Filing date |
|---|---|---|---|---|---|---|---|
| Ensign Peak Advisors, Inc | Buy | +592,473 | — | 592,473 | $2.78M | Q1 2026 | Aug 18, 2026 |
| Mirae Asset Global Investments Co., Ltd. | Buy | +605 | +7.3% | 8,838 | $41.54K | Q1 2026 | Aug 12, 2026 |
| Wells Fargo & Company/Mn | Sell | -10 | -0.2% | 6,595 | $31.00K | Q1 2026 | Jul 08, 2026 |
| Bank Of America Corp | Buy | +9,326,480 | +1064.3% | 10,202,785 | $47.95M | Q1 2026 | May 18, 2026 |
| Ally Bridge Group (Ny) Llc | Buy | +900,000 | — | 900,000 | $4.23M | Q1 2026 | May 18, 2026 |
| Adar1 Capital Management, Llc | Sell | -772,579 | -18.5% | 3,410,190 | $16.03M | Q1 2026 | May 18, 2026 |
| California State Teachers Retirement System | Buy | +88,379 | — | 88,379 | $415.38K | Q1 2026 | May 18, 2026 |
| Fmr Llc | Buy | +7,267,528 | +29.4% | 31,955,637 | $150.19M | Q1 2026 | May 15, 2026 |
| Kynam Capital Management, Lp | Buy | +6,047,016 | +67.4% | 15,013,093 | $70.56M | Q1 2026 | May 15, 2026 |
| Venrock Adviser, Llc | Sell | -5,579,376 | -35.9% | 9,982,124 | $46.92M | Q1 2026 | May 15, 2026 |
| Citadel Advisors Llc | Buy | +5,063,889 | +1479.4% | 5,406,193 | $25.41M | Q1 2026 | May 15, 2026 |
| Nextech Invest, Ltd. | Buy | +4,449,932 | — | 4,449,932 | $20.91M | Q1 2026 | May 15, 2026 |
| Elmind Capital, Lp | Buy | +3,850,000 | +550.0% | 4,550,000 | $21.39M | Q1 2026 | May 15, 2026 |
| Wellington Management Group Llp | Buy | +3,582,985 | — | 3,582,985 | $16.84M | Q1 2026 | May 15, 2026 |
| Millennium Management Llc | Buy | +3,370,537 | +1163.6% | 3,660,190 | $17.20M | Q1 2026 | May 15, 2026 |
| Balyasny Asset Management L.P. | Sell | -3,141,358 | -81.1% | 730,844 | $3.43M | Q1 2026 | May 15, 2026 |
| Marshall Wace, Llp | Buy | +2,981,240 | +257.7% | 4,138,176 | $19.45M | Q1 2026 | May 15, 2026 |
| Point72 Asset Management, L.P. | Buy | +2,685,852 | +51.8% | 7,875,390 | $37.01M | Q1 2026 | May 15, 2026 |
| Qube Research & Technologies Ltd | Buy | +1,188,455 | +112.0% | 2,249,583 | $10.57M | Q1 2026 | May 15, 2026 |
| Two Sigma Investments, Lp | Buy | +1,149,401 | +73.6% | 2,710,156 | $12.74M | Q1 2026 | May 15, 2026 |
| Gilder Gagnon Howe & Co Llc | Buy | +1,120,309 | — | 1,120,309 | $5.27M | Q1 2026 | May 15, 2026 |
| Patient Square Capital Lp | Buy | +1,085,790 | — | 1,085,790 | $5.10M | Q1 2026 | May 15, 2026 |
| Goldman Sachs Group Inc | Sell | -1,001,105 | -40.7% | 1,459,839 | $6.86M | Q1 2026 | May 15, 2026 |
| Eventide Asset Management, Llc | Buy | +900,000 | — | 900,000 | $4.23M | Q1 2026 | May 15, 2026 |
| Trexquant Investment Lp | Buy | +898,767 | — | 898,767 | $4.22M | Q1 2026 | May 15, 2026 |
| Susquehanna International Group, Llp | Buy | +888,017 | +90.5% | 1,869,615 | $8.79M | Q1 2026 | May 15, 2026 |
| Boothbay Fund Management, Llc | Sell | -879,663 | -98.3% | 15,000 | $70.50K | Q1 2026 | May 15, 2026 |
| Baker Bros. Advisors Lp | Buy | +725,000 | +17.1% | 4,975,826 | $23.39M | Q1 2026 | May 15, 2026 |
| Dv Trading Llc | Buy | +714,000 | — | 714,000 | $3.36M | Q1 2026 | May 15, 2026 |
| Eversept Partners, Lp | Buy | +681,424 | +27.2% | 3,188,514 | $14.99M | Q1 2026 | May 15, 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.
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