🕵️ Zenas Biopharma, Inc. ($ZBIO)
SEC insider & ownership activity, last 12 months · CIK 1953926 · every row links its SEC filing
Insider buy value was withheld pending verification over the last 12 months. Leon O. Moulder Jr. added 4.8% → 5.1%. No red-flag 8-Ks in the window.
Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
7 buyers, value withheld pending verification (26 lots) · 0 sellers, $0 (0 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Fairmount Funds Management LLC | 2 | $9.0M | 0 | – | Mar 31, 2026 |
| Lu Hongbo | 5 | value withheld pending verification | 0 | – | Mar 31, 2026 |
| Leon O. Moulder Jr. | 10 | $6.5M | 0 | – | May 18, 2026 |
| SR One Capital Management, LLC | 2 | $2.4M | 0 | – | Oct 9, 2025 |
| Patrick G. Enright | 2 | $2.3M | 0 | – | Oct 9, 2025 |
| Nunn Jason Raleigh | 1 | $1.2M | 0 | – | Oct 9, 2025 |
| Patricia L. Allen | 4 | $500K | 0 | – | Feb 13, 2026 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| FMR LLC | 14.3% | 13G | Feb 5, 2026 | filing ↗ | |
| Abigail P. Johnson | 14.3% | 13G | Feb 5, 2026 | filing ↗ | |
| InnoCare Pharma Inc. | 10.4% | 13G | Sep 8, 2026 | filing ↗ | |
| Ocean Prominent Limited | 10.4% | 13G | Sep 8, 2026 | filing ↗ | |
| InnoCare Pharma Limited | 10.4% | 13G | Sep 8, 2026 | filing ↗ | |
| Wellington Management Group LLP | 10.1% | 13G | Sep 8, 2026 | filing ↗ | |
| Wellington Group Holdings LLP | 10.1% | 13G | Sep 8, 2026 | filing ↗ | |
| Wellington Investment Advisors Holdings LLP | 10.1% | 13G | Sep 8, 2026 | filing ↗ | |
| Wellington Management Company LLP | 9.9% | 13G | Sep 8, 2026 | filing ↗ | |
| Simeon George | 7.7% | 13D | Aug 13, 2026 | filing ↗ | |
| SR One Capital Management, LLC | 7.7% | 13D | Aug 13, 2026 | filing ↗ | |
| Leon O. Moulder Jr. | 5.1% | 13D | Apr 29, 2026 | filing ↗ | |
| Enavate Sciences GP, LLC | exited | 13D | Aug 19, 2026 | filing ↗ | |
| Zebra Aggregator, LP | exited | 13D | Aug 19, 2026 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| Zebra Aggregator, LP | $31.9M | Aug 19, 2026 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Earnings (2.02) | Aug 12, 2026 | filing ↗ |
| Officer/director changes (5.02) | Aug 12, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 12, 2026 | filing ↗ |
| Earnings (2.02) | May 11, 2026 | filing ↗ |
| Officer/director changes (5.02) | May 11, 2026 | filing ↗ |
| Shareholder vote (5.07) | May 11, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 11, 2026 | filing ↗ |
| Material agreement (1.01) | Mar 26, 2026 | filing ↗ |
| New financial obligation (2.03) | Mar 26, 2026 | filing ↗ |
| Other events (8.01) | Mar 26, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Mar 26, 2026 | filing ↗ |
| Earnings (2.02) | Mar 16, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Mar 16, 2026 | filing ↗ |
| Officer/director changes (5.02) | Feb 10, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Feb 10, 2026 | filing ↗ |
| Earnings (2.02) | Jan 5, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Jan 5, 2026 | filing ↗ |
| Other events (8.01) | Jan 5, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jan 5, 2026 | filing ↗ |
| Officer/director changes (5.02) | Dec 10, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Dec 10, 2025 | filing ↗ |
| Earnings (2.02) | Nov 12, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 12, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Oct 27, 2025 | filing ↗ |
| Other events (8.01) | Oct 27, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Oct 27, 2025 | filing ↗ |
| Material agreement (1.01) | Oct 7, 2025 | filing ↗ |
| Earnings (2.02) | Oct 7, 2025 | filing ↗ |
| Unregistered equity sale (3.02) | Oct 7, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Oct 7, 2025 | filing ↗ |