🕵️ Zentalis Pharmaceuticals, Inc. ($ZNTL)
SEC insider & ownership activity, last 12 months · CIK 1725160 · every row links its SEC filing
Over the last 12 months insiders sold $10.1M against $7.8M of open-market buying. Matrix Capital Management Company, LP sold $10.0M in discretionary trades (Dec). No red-flag 8-Ks in the window.
Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
1 buyer, $7.8M (1 lots) · 4 sellers, $10.1M (10 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Matrix Capital Management Company, LP | 0 | – | 1 | $10.0M | Dec 15, 2025 |
| Walters Group | 1 | $7.8M | 0 | – | Dec 31, 2025 |
| Vultaggio Vincent | 0 | – | 5 | $105K | Feb 10, 2026 |
| Eastland Julia Marie | 0 | – | 2 | $21K | Feb 9, 2026 |
| Bruns Ingmar | 0 | – | 2 | $8K | Feb 9, 2026 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| William T. Walters | 19.7% | 13G | Jan 5, 2026 | filing ↗ | |
| Walters Group | 19.7% | 13G | Jan 5, 2026 | filing ↗ | |
| Walters, Susan B. | 19.7% | 13G | Jan 5, 2026 | filing ↗ | |
| Andrew J. Schwab | 6.4% | 13G | Dec 30, 2025 | filing ↗ | |
| Kush Parmar | 6.4% | 13G | Dec 30, 2025 | filing ↗ | |
| Finny Kuruvilla, M.D., PH. D. | 6.3% | 13G | Feb 14, 2025 | filing ↗ | |
| Barclays PLC | 5.3% | 13G | Nov 12, 2025 | filing ↗ | |
| 5AM Opportunities II (GP), LLC | 5.2% | 13G | Dec 30, 2025 | filing ↗ | |
| 5AM Opportunities II, L.P. | 5.2% | 13G | Dec 30, 2025 | filing ↗ | |
| Squadron Master Fund LP | 5.1% | 13G | Mar 3, 2026 | filing ↗ | |
| Squadron Capital Management LLC | 5.1% | 13G | Mar 3, 2026 | filing ↗ | |
| Matthew Sesterhenn | 5.1% | 13G | Mar 3, 2026 | filing ↗ | |
| William Blank | 5.1% | 13G | Mar 3, 2026 | filing ↗ |
Planned insider sales (Form 144)
No sale notices filed in the last 12 months.
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Shareholder vote (5.07) | Jun 16, 2026 | filing ↗ |
| Officer/director changes (5.02) | May 22, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | May 21, 2026 | filing ↗ |
| Other events (8.01) | May 21, 2026 | filing ↗ |
| Earnings (2.02) | May 12, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | May 12, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | May 5, 2026 | filing ↗ |
| Other events (8.01) | May 5, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Apr 17, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Apr 9, 2026 | filing ↗ |
| Other events (8.01) | Apr 9, 2026 | filing ↗ |
| Earnings (2.02) | Mar 26, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Mar 26, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Jan 6, 2026 | filing ↗ |
| Other events (8.01) | Jan 6, 2026 | filing ↗ |
| Officer/director changes (5.02) | Dec 15, 2025 | filing ↗ |
| Other events (8.01) | Dec 15, 2025 | filing ↗ |
| Earnings (2.02) | Nov 10, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Nov 10, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 10, 2025 | filing ↗ |
| Officer/director changes (5.02) | Aug 26, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Aug 26, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 26, 2025 | filing ↗ |
| Earnings (2.02) | Aug 6, 2025 | filing ↗ |
| Reg FD disclosure (7.01) | Aug 6, 2025 | filing ↗ |