🕵️ SERA Prognostics, Inc. ($SERA)
SEC insider & ownership activity, last 12 months · CIK 1534969 · every row links its SEC filing
Over the last 12 months insiders sold $650K with no open-market buying against it. Lindgardt Zhenya sold $291K (Nov–Sep). 3 planned sales are pending, the largest $40K (Lindgardt Zhenya). No red-flag 8-Ks in the window.
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Monthly net open-market insider flow, last 12 months (up = net buying)
Insider flow
0 buyers, $0 (0 lots) · 10 sellers, $650K (53 lots)
| Insider | Buys | Bought | Sells | Sold | Last |
|---|---|---|---|---|---|
| Lindgardt Zhenya | 0 | – | 9 | $291K | Sep 10, 2026 |
| Paul Kearney | 0 | – | 6 | $131K | Mar 11, 2026 |
| Aerts Austin | 0 | – | 8 | $66K | Jun 11, 2026 |
| Robert Harrison | 0 | – | 10 | $62K | Mar 11, 2026 |
| Jackson Benjamin | 0 | – | 6 | $38K | Sep 10, 2026 |
| John J. Boniface | 0 | – | 4 | $34K | Mar 11, 2026 |
| Anderson Dyaarl Lee Jr. | 0 | – | 2 | $13K | Sep 10, 2026 |
| Sandra Aj Lawrence | 0 | – | 3 | $11K | Jun 8, 2026 |
| Mirza Mansoor Raza | 0 | – | 3 | $2K | Dec 5, 2025 |
| Inglis Tiffany Eul Davis | 0 | – | 2 | $2K | Sep 10, 2026 |
5%+ holders
| Holder | Stake | Class | Schedule | Event | |
|---|---|---|---|---|---|
| Baker BROS. Advisors LP | 16.1% | 13D | Feb 12, 2025 | filing ↗ | |
| Baker BROS. Advisors (GP) LLC | 16.1% | 13D | Feb 12, 2025 | filing ↗ | |
| Julian C. Baker | 16.1% | 13D | Feb 12, 2025 | filing ↗ | |
| Felix J. Baker | 16.1% | 13D | Feb 12, 2025 | filing ↗ | |
| Whetstone Capital Advisors, LLC | 8.6% | 13G | May 1, 2026 | filing ↗ | |
| David Atterbury | 8.6% | 13G | May 1, 2026 | filing ↗ | |
| Marcin Czernik | 7.6% | 13D | Feb 11, 2025 | filing ↗ | |
| Andreas Hadjimichael | 7.6% | 13D | Feb 11, 2025 | filing ↗ | |
| Anastasis Nikolaou | 7.6% | 13D | Feb 11, 2025 | filing ↗ | |
| Wiaczeslaw Smolokowski | 7.6% | 13D | Feb 11, 2025 | filing ↗ | |
| Chione Ltd. | 7.6% | 13D | Feb 11, 2025 | filing ↗ | |
| Aberdeen Group PLC | 7.2% | Class A | 13G | Jul 15, 2026 | filing ↗ |
| Abrdn Inc. | 7.2% | Class A | 13G | Jul 15, 2026 | filing ↗ |
Planned insider sales (Form 144)
| Seller | Planned | Approx. sale date | |
|---|---|---|---|
| Inglis Tiffany Eul Davis | $972 | Sep 10, 2026 | filing ↗ |
| Anderson Dyaarl Lee Jr. | $4K | Sep 10, 2026 | filing ↗ |
| Aerts Austin | $3K | Sep 10, 2026 | filing ↗ |
| Lindgardt Zhenya | $14K | Sep 10, 2026 | filing ↗ |
| Jackson Benjamin | $4K | Sep 10, 2026 | filing ↗ |
| Aerts Austin | $27K | Sep 8, 2026 | filing ↗ |
| Lindgardt Zhenya | $40K | Sep 8, 2026 | filing ↗ |
| Inglis Tiffany Eul Davis | $726 | Jun 11, 2026 | filing ↗ |
| Anderson Dyaarl Lee Jr. | $10K | Jun 11, 2026 | filing ↗ |
| Aerts Austin | $4K | Jun 11, 2026 | filing ↗ |
| Lindgardt Zhenya | $14K | Jun 11, 2026 | filing ↗ |
| Jackson Benjamin | $4K | Jun 11, 2026 | filing ↗ |
| Aerts Austin | $11K | Jun 9, 2026 | filing ↗ |
| Lindgardt Zhenya | $43K | Jun 9, 2026 | filing ↗ |
| Sandra Aj Lawrence | $4K | Jun 8, 2026 | filing ↗ |
| Paul Kearney | $12K | May 12, 2026 | filing ↗ |
| Robert Harrison | $5K | Apr 21, 2026 | filing ↗ |
| Robert Harrison | $4K | Mar 24, 2026 | filing ↗ |
| Lindgardt Zhenya | $6K | Mar 11, 2026 | filing ↗ |
| Kearney Paul | $3K | Mar 11, 2026 | filing ↗ |
| Jackson Benjamin | $2K | Mar 11, 2026 | filing ↗ |
| Harrison Robert Gardner | $1K | Mar 11, 2026 | filing ↗ |
| John J. Boniface | $3K | Mar 11, 2026 | filing ↗ |
| Aerts Austin | $2K | Mar 11, 2026 | filing ↗ |
| Lindgardt Zhenya | $43K | Mar 10, 2026 | filing ↗ |
| Aerts Austin | $12K | Mar 10, 2026 | filing ↗ |
| Kearney Paul | $4K | Mar 9, 2026 | filing ↗ |
| Jackson Benjamin | $6K | Mar 9, 2026 | filing ↗ |
| Harrison Robert Gardner | $7K | Mar 9, 2026 | filing ↗ |
| John J. Boniface | $6K | Mar 9, 2026 | filing ↗ |
| Aerts Austin | $1K | Mar 9, 2026 | filing ↗ |
| Sandra Aj Lawrence | $3K | Mar 6, 2026 | filing ↗ |
| Robert Harrison | $5K | Feb 24, 2026 | filing ↗ |
| Robert Harrison | $6K | Jan 27, 2026 | filing ↗ |
| Robert Gardner Harrison | $7K | Dec 30, 2025 | filing ↗ |
| Lindgardt Zhenya | $14K | Dec 10, 2025 | filing ↗ |
| Kearney Paul | $4K | Dec 10, 2025 | filing ↗ |
| Jackson Benjamin | $3K | Dec 10, 2025 | filing ↗ |
| Harrison Robert Gardner | $2K | Dec 10, 2025 | filing ↗ |
| John J. Boniface | $4K | Dec 10, 2025 | filing ↗ |
| Aerts Austin | $3K | Dec 10, 2025 | filing ↗ |
| Lindgardt Zhenya | $86K | Dec 9, 2025 | filing ↗ |
| Aerts Austin | $16K | Dec 9, 2025 | filing ↗ |
| Sandra Aj Lawrence | $5K | Dec 8, 2025 | filing ↗ |
| Mirza Mansoor Raza | $892 | Dec 5, 2025 | filing ↗ |
| Paul Kearney | $95K | Dec 2, 2025 | filing ↗ |
| Robert Gardner Harrison | $6K | Dec 2, 2025 | filing ↗ |
| Paul Kearney | $116K | Nov 26, 2025 | filing ↗ |
| Lindgardt Zhenya | $30K | Nov 10, 2025 | filing ↗ |
| Kearney Paul | $19K | Nov 10, 2025 | filing ↗ |
Material events (8-K)
| Item | Event date | |
|---|---|---|
| Officer/director changes (5.02) | Aug 14, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Aug 14, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 14, 2026 | filing ↗ |
| Earnings (2.02) | Aug 12, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Aug 12, 2026 | filing ↗ |
| Officer/director changes (5.02) | Jun 25, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jun 25, 2026 | filing ↗ |
| Shareholder vote (5.07) | Jun 4, 2026 | filing ↗ |
| Officer/director changes (5.02) | May 26, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 26, 2026 | filing ↗ |
| Earnings (2.02) | May 6, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | May 6, 2026 | filing ↗ |
| Earnings (2.02) | Mar 18, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Mar 18, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Jan 8, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jan 8, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Jan 7, 2026 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Jan 7, 2026 | filing ↗ |
| Reg FD disclosure (7.01) | Nov 24, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 24, 2025 | filing ↗ |
| Earnings (2.02) | Nov 13, 2025 | filing ↗ |
| Financial Statements and Exhibits (9.01) | Nov 13, 2025 | filing ↗ |