SEC Form 4 · Updated Daily
ZBIO
— ZENAS BIOPHARMA, 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 |
|---|---|---|---|---|
| Harwin Peter Evan | Director | 2,359,025 | 2026-03-31 | P |
| Fairmount Healthcare Fund II L.P. | Director | 2,359,025 | 2026-03-31 | P |
| Fairmount Funds Management LLC | Director | 2,359,025 | 2026-03-31 | P |
| Kiselak Tomas | Director | 2,359,025 | 2026-03-31 | P |
| George Simeon | 10%+ Owner | 1,917,895 | 2025-10-09 | P |
| SR ONE CAPITAL MANAGEMENT, LLC | 10%+ Owner | 1,917,895 | 2025-10-09 | P |
| Nunn Jason Raleigh | Director | 1,173,395 | 2025-10-09 | P |
| Lu Hongbo | Director | 422,968 | 2026-03-31 | P |
| MOULDER LEON O JR | Director · Officer | 96,928 | 2026-05-18 | P |
| Allen Patricia L | Director | 19,860 | 2026-02-13 | P |
| ENRIGHT PATRICK G | Director | 11,990 | 2025-10-09 | P |
| Fox Jennifer A. | Officer | 1,592 | 2026-02-05 | A |
| Farmer Joseph L | Officer | 974 | 2026-02-05 | A |
Recent Filings
| Date | Owner | Activity | Shares | Price | Owned After |
|---|---|---|---|---|---|
| 2026-09-01 | Oliger Christy J. | Grant / award (derivative) | 37,000 | $0.00 | 37,000 |
| 2026-06-15 | Fox Jennifer A. | Grant / award (derivative) | 125,000 | $0.00 | 125,000 |
| 2026-06-15 | Farmer Joseph L | Grant / award (derivative) | 175,000 | $0.00 | 175,000 |
| 2026-06-15 | ENRIGHT PATRICK G | Grant / award (derivative) | 18,500 | $0.00 | 18,500 |
| 2026-06-15 | Boylan James P | Grant / award (derivative) | 18,500 | $0.00 | 18,500 |
| 2026-06-15 | Allen Patricia L | Grant / award (derivative) | 18,500 | $0.00 | 18,500 |
| 2026-06-15 | von Moltke Lisa | Grant / award (derivative) | 150,000 | $0.00 | 150,000 |
| 2026-06-15 | ORLOFF JOHN J | Grant / award (derivative) | 18,500 | $0.00 | 18,500 |
| 2026-06-15 | MOULDER LEON O JR | Grant / award (derivative) | 500,000 | $0.00 | 500,000 |
| 2026-06-15 | Lu Hongbo | Grant / award (derivative) | 18,500 | $0.00 | 18,500 |
| 2026-06-15 | Nunn Jason Raleigh | Grant / award (derivative) | 18,500 | $0.00 | 18,500 |
| 2026-05-18 | MOULDER LEON O JR | Open-market buy | 60,000 | $16.88 | 96,928 |
| 2026-04-29 | MOULDER LEON O JR | Open-market buy | 35,000 | $17.62 | 1,786,039 |
| 2026-04-28 | MOULDER LEON O JR | Open-market buy | 25,000 | $18.02 | 1,751,039 |
| 2026-03-31 | Lu Hongbo | Open-market buy | 75,000 | $20.00 | 422,968 |
| 2026-03-31 | MOULDER LEON O JR | Open-market buy | 34,000 | $19.31 | 1,726,039 |
| 2026-03-31 | Harwin Peter Evan | Open-market buy | 150,000 | $20.00 | 2,359,025 |
| 2026-03-31 | Kiselak Tomas | Open-market buy | 150,000 | $20.00 | 2,359,025 |
| 2026-03-31 | Fairmount Healthcare Fund II L.P. | Open-market buy | 150,000 | $20.00 | 2,359,025 |
| 2026-03-31 | Fairmount Funds Management LLC | Open-market buy | 150,000 | $20.00 | 2,359,025 |
| 2026-03-31 | Lu Hongbo | Open-market buy | 3,768 | $18.63 | 426,736 |
| 2026-03-30 | MOULDER LEON O JR | Open-market buy | 20,000 | $18.23 | 1,692,039 |
| 2026-02-13 | Allen Patricia L | Open-market buy | 4,160 | $26.36 | 19,860 |
| 2026-02-12 | Allen Patricia L | Open-market buy | 5,000 | $26.50 | 15,700 |
| 2026-02-12 | Allen Patricia L | Open-market buy | 5,700 | $24.34 | 10,700 |
| 2026-02-12 | Allen Patricia L | Open-market buy | 5,000 | $23.77 | 5,000 |
| 2026-02-11 | Lu Hongbo | Open-market buy | 25,985 | $22.50 | 347,968 |
| 2026-02-05 | Fox Jennifer A. | Grant / award | 1,592 | $13.35 | 1,592 |
| 2026-02-05 | Farmer Joseph L | Grant / award | 974 | $13.35 | 974 |
| 2026-02-02 | MOULDER LEON O JR | Open-market buy | 57,000 | $17.96 | 423,155 |
| 2026-01-09 | MOULDER LEON O JR | Open-market buy | 20,000 | $16.55 | 366,155 |
| 2026-01-08 | MOULDER LEON O JR | Open-market buy | 30,000 | $16.30 | 346,155 |
| 2026-01-07 | MOULDER LEON O JR | Open-market buy | 50,000 | $16.38 | 316,155 |
| 2025-10-09 | ENRIGHT PATRICK G | Open-market buy | 11,990 | $20.85 | 11,990 |
| 2025-10-09 | ENRIGHT PATRICK G | Open-market buy | 105,265 | $19.00 | 1,832,669 |
| 2025-10-09 | George Simeon | Open-market buy | 63,157 | $19.00 | 1,917,895 |
| 2025-10-09 | George Simeon | Open-market buy | 63,158 | $19.00 | 1,173,395 |
| 2025-10-09 | SR ONE CAPITAL MANAGEMENT, LLC | Open-market buy | 63,157 | $19.00 | 1,917,895 |
| 2025-10-09 | SR ONE CAPITAL MANAGEMENT, LLC | Open-market buy | 63,158 | $19.00 | 1,173,395 |
| 2025-10-09 | Nunn Jason Raleigh | Open-market buy | 63,158 | $19.00 | 1,173,395 |
Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.