SEC Form 4 · Updated Daily
CTMX
— CYTOMX THERAPEUTICS, INC. OwnershipInsider and institutional ownership derived from SEC Form 4 filings. Click any owner to see their holdings across every company they’ve filed on, and how their position has changed over time.
Current Reporting Owners
| Owner | Role | Shares Owned | As Of | Last Activity |
|---|---|---|---|---|
| TEPPER ROBERT I | 10%+ Owner | 3,320,348 | 2017-10-18 | J |
| LEVIN MARK J | 10%+ Owner · Director | 3,320,348 | 2017-10-18 | J |
| TRV GP, LLC | 10%+ Owner | 3,320,348 | 2017-10-18 | J |
| THIRD ROCK VENTURES LP | 10%+ Owner | 3,320,348 | 2017-10-18 | J |
| Third Rock Ventures GP, L.P. | 10%+ Owner | 3,320,348 | 2017-10-18 | J |
| STARR KEVIN P | 10%+ Owner | 3,320,348 | 2017-10-18 | J |
| SHANNON TIMOTHY M | Director | 3,244,381 | 2016-11-29 | S |
| BVF PARTNERS L P/IL | 10%+ Owner | 2,945,743 | 2020-12-18 | — |
| BIOTECHNOLOGY VALUE FUND L P | 10%+ Owner | 2,945,743 | 2020-12-18 | — |
| BVF I GP LLC | 10%+ Owner | 2,945,743 | 2020-12-18 | — |
| BIOTECHNOLOGY VALUE FUND II LP | Reporting Owner | 2,945,743 | 2020-12-18 | — |
| BVF II GP LLC | Reporting Owner | 2,945,743 | 2020-12-18 | — |
| Biotechnology Value Trading Fund OS LP | Reporting Owner | 2,945,743 | 2020-12-18 | — |
| BVF Partners OS Ltd. | Reporting Owner | 2,945,743 | 2020-12-18 | — |
| BVF GP HOLDINGS LLC | 10%+ Owner | 2,945,743 | 2020-12-18 | — |
| BVF INC/IL | 10%+ Owner | 2,945,743 | 2020-12-18 | — |
| LAMPERT MARK N | 10%+ Owner | 2,945,743 | 2020-12-18 | — |
| Canaan IX L.P. | 10%+ Owner | 2,494,381 | 2017-03-27 | J |
| Canaan Partners IX LLC | 10%+ Owner | 2,494,381 | 2017-03-27 | J |
| McCarthy Sean A. | Director · Officer | 1,191,477 | 2025-11-06 | M |
| Hadley Harbor Master Investors (Cayman) L.P. | 10%+ Owner | 749,055 | 2015-10-14 | C |
| Flynn James E | 10%+ Owner | 671,024 | 2015-10-14 | P |
| DEERFIELD MANAGEMENT COMPANY, L.P. (SERIES C) | 10%+ Owner | 671,024 | 2015-10-14 | P |
| Deerfield Mgmt L.P. | 10%+ Owner | 671,024 | 2015-10-14 | P |
| Deerfield Special Situations Fund, L.P. | Reporting Owner | 671,024 | 2015-10-14 | P |
| Deerfield Mgmt III, L.P. | 10%+ Owner | 671,024 | 2015-10-14 | P |
| Deerfield Private Design Fund III, L.P. | 10%+ Owner | 671,024 | 2015-10-14 | P |
| BELVIN MARCIA | Officer | 300,760 | 2026-03-17 | S |
| Ogden Christopher | Officer | 295,324 | 2026-06-15 | S |
| GLUCK FREDERICK W | Director | 237,015 | 2019-04-08 | G |
| Chu Yu-Waye | Officer | 189,446 | 2026-03-17 | S |
| Landau Jeffrey B | Officer | 123,237 | 2024-08-20 | M |
| ROWLAND LLOYD A | Officer | 120,594 | 2025-03-18 | S |
| Carvajal Alejandra | Officer | 100,000 | 2026-08-03 | A |
| Peterson Amy C. | Officer | 58,433 | 2023-03-16 | S |
| HUMPHREY RACHEL | Officer | 46,394 | 2018-03-02 | M |
| Campoy Carlos | Officer | 38,224 | 2023-03-16 | S |
| HANNAH ALISON L. | Director | 37,500 | 2022-07-19 | A |
| Goeltz II Robert C. | Officer | 32,756 | 2017-05-12 | M |
| Lester Rachael | Officer | 20,000 | 2026-02-02 | A |
| Kavanaugh William Michael | Officer | 19,047 | 2017-12-08 | M |
| RAY DEBANJAN | Officer | 8,928 | 2018-12-12 | M |
| Jones Elaine V | Director | 5,142 | 2023-03-29 | P |
| LADD CYNTHIA J | Officer | 3,000 | 2015-10-14 | P |
| Knifsend Robin | Officer | 2,791 | 2019-05-31 | A |
| Exter Neil | Director | 0 | 2017-03-23 | S |
Recent Filings
| Date | Owner | Activity | Shares | Price | Owned After |
|---|---|---|---|---|---|
| 2026-08-03 | Carvajal Alejandra | Grant / award (derivative) | 450,000 | $0.00 | 450,000 |
| 2026-08-03 | Carvajal Alejandra | Grant / award | 100,000 | $0.00 | 100,000 |
| 2026-07-24 | Fuchs Charles S. | Grant / award (derivative) | 118,000 | $0.00 | 118,000 |
| 2026-06-17 | Jones Elaine V | Grant / award (derivative) | 59,000 | $0.00 | 59,000 |
| 2026-06-17 | Ashworth Alan | Grant / award (derivative) | 59,000 | $0.00 | 59,000 |
| 2026-06-17 | Gilbert Halley E | Grant / award (derivative) | 59,000 | $0.00 | 59,000 |
| 2026-06-17 | Meyers James R | Grant / award (derivative) | 59,000 | $0.00 | 59,000 |
| 2026-06-17 | Mohindru Mani | Grant / award (derivative) | 59,000 | $0.00 | 59,000 |
| 2026-06-17 | Young Matthew P. | Grant / award (derivative) | 59,000 | $0.00 | 59,000 |
| 2026-06-17 | Su Zhen | Grant / award (derivative) | 59,000 | $0.00 | 59,000 |
| 2026-06-15 | Ogden Christopher | Open-market sale | 1,624 | $3.05 | 295,324 |
| 2026-03-17 | Ogden Christopher | Open-market sale | 19,323 | $6.42 | 296,948 |
| 2026-03-17 | BELVIN MARCIA | Open-market sale | 31,492 | $6.42 | 300,760 |
| 2026-03-17 | McCarthy Sean A. | Open-market sale | 118,969 | $6.42 | 1,078,922 |
| 2026-03-17 | Chu Yu-Waye | Open-market sale | 21,279 | $6.42 | 189,446 |
| 2026-02-02 | McCarthy Sean A. | Grant / award (derivative) | 980,000 | $0.00 | 980,000 |
| 2026-02-02 | McCarthy Sean A. | Grant / award | 210,000 | $0.00 | 1,197,891 |
| 2026-02-02 | Ogden Christopher | Grant / award (derivative) | 325,000 | $0.00 | 325,000 |
| 2026-02-02 | Ogden Christopher | Grant / award | 90,000 | $0.00 | 316,271 |
| 2026-02-02 | BELVIN MARCIA | Grant / award (derivative) | 250,000 | $0.00 | 250,000 |
| 2026-02-02 | BELVIN MARCIA | Grant / award | 60,000 | $0.00 | 332,252 |
| 2026-02-02 | Chu Yu-Waye | Grant / award (derivative) | 300,000 | $0.00 | 300,000 |
| 2026-02-02 | Chu Yu-Waye | Grant / award | 75,000 | $0.00 | 210,725 |
| 2026-02-02 | Lester Rachael | Grant / award (derivative) | 50,000 | $0.00 | 50,000 |
| 2026-02-02 | Lester Rachael | Grant / award (derivative) | 50,000 | $0.00 | 50,000 |
| 2026-02-02 | Lester Rachael | Grant / award | 20,000 | $0.00 | 20,000 |
| 2025-11-06 | McCarthy Sean A. | Option exercise (derivative) | 101,793 | $0.00 | 348,207 |
| 2025-11-06 | McCarthy Sean A. | Open-market sale | 101,793 | $4.54 | 1,089,684 |
| 2025-11-06 | McCarthy Sean A. | Option exercise | 101,793 | $1.59 | 1,191,477 |
| 2025-11-06 | McCarthy Sean A. | Open-market sale | 101,793 | $4.54 | 987,891 |
| 2025-10-20 | Lester Rachael | Grant / award (derivative) | 650,000 | $0.00 | 650,000 |
| 2025-09-26 | BELVIN MARCIA | Grant / award (derivative) | 18,150 | $0.00 | 18,150 |
| 2025-09-26 | BELVIN MARCIA | Grant / award (derivative) | 36,300 | $0.00 | 36,300 |
| 2025-09-26 | Ogden Christopher | Grant / award (derivative) | 39,150 | $0.00 | 39,150 |
| 2025-09-26 | Ogden Christopher | Grant / award (derivative) | 78,250 | $0.00 | 78,250 |
| 2025-09-26 | Chu Yu-Waye | Grant / award (derivative) | 43,750 | $0.00 | 43,750 |
| 2025-09-26 | Chu Yu-Waye | Grant / award (derivative) | 87,500 | $0.00 | 87,500 |
| 2025-09-26 | McCarthy Sean A. | Grant / award (derivative) | 285,000 | $0.00 | 285,000 |
| 2025-09-26 | McCarthy Sean A. | Grant / award (derivative) | 570,000 | $0.00 | 570,000 |
| 2025-06-16 | McCarthy Sean A. | Open-market sale | 55,511 | $2.69 | 1,089,684 |
Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.