Sera
Develops blood tests and predictive analytics for earlier assessment of spontaneous preterm-birth risk.
$2.00
After-hours close−0.06 (−3.15%)
At close$2.07(+1.72%)
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Breakdown13F · Form 4
Institutions 52.49%20.04M sharesInsiders 8.18%3.12M sharesOther 39.33%15.02M shares
Shares outstanding 38.19M · Float 27.47M · 71.9% free float
Institutions13F, as of Mar 31, 2026
57 holders · 20.04M shares · 12 new positions · 17 increased · 17 reduced · 12 closed
| Holder | Shares | % outstanding | Chg q/q | Filed |
|---|---|---|---|---|
| Baker Bros. Advisors LP | 5.50M | 14.40% | 0 | May 15, 2026 |
| Whetstone Capital Advisors, LLC | 3.31M | 8.66% | −152.8K | May 15, 2026 |
| Abrdn PLC | 2.55M | 6.68% | +271.1K | Apr 29, 2026 |
| PSP Research LLC | 2.40M | 6.28% | +2.40Mnew | Apr 17, 2026 |
| Vivo Capital, LLC | 1.65M | 4.32% | 0 | May 20, 2026 |
| Vanguard Capital Management LLC | 1.20M | 3.15% | +1.20Mnew | May 15, 2026 |
| Captrust Financial Advisors | 536.8K | 1.41% | −5 | May 15, 2026 |
| Geode Capital Management, LLC | 363.6K | 0.95% | +29.0K | May 15, 2026 |
Beneficial owners13D/G · 5% or more, as filed
| Holder | % of class | Shares | Form | Filed |
|---|---|---|---|---|
| Baker Bros. Advisors (GP) LLCincl. Baker Bros. Advisors LP, Felix J. Baker +1 more | 16.10% | 5.50M | 13D | Feb 14, 2025 ↗ |
| Whetstone Capital Advisors, LLC | 8.60% | 3.31M | 13G | May 1, 2026 ↗ |
| Chione Ltd.incl. Anastasis Nikolaou, Andreas Hadjimichael +2 more | 7.60% | 2.61M | 13D | Feb 14, 2025 ↗ |
| Aberdeen Group plc | 7.21% | 2.75M | 13G | Jul 15, 2026 ↗ |
InsidersForm 4
| Insider | Role | Shares | % outstanding | Filed |
|---|---|---|---|---|
| Zhenya Lindgardt | director, officer: Chief Executive Officer | 865.0K | 2.26% | Jun 15, 2026 |
| Gregory C. Critchfield | director | 845.3K | 2.21% | Jul 14, 2026 |
| Austin Aerts | officer: Chief Financial Officer | 301.2K | 0.79% | Jun 15, 2026 |
| Paul Kearney | officer: Chief Data Officer | 164.0K | 0.43% | Mar 12, 2026 |
| Benjamin Jackson | officer: General Counsel | 161.8K | 0.42% | Jun 15, 2026 |
| John J. Boniface | officer: Chief Scientific Officer | 145.8K | 0.38% | Mar 12, 2026 |
| Tiffany Eul Davis Inglis | officer: Chief Medical Officer | 92.1K | 0.24% | Jun 15, 2026 |
| Mansoor Raza Mirza | director | 80.2K | 0.21% | Jul 14, 2026 |
| Joshua Phillips | director | 79.4K | 0.21% | Jul 14, 2026 |
| Dyaarl Lee Jr. Anderson | officer: Chief Commercial Officer | 78.0K | 0.20% | Jun 15, 2026 |
2 ten-percent owners hold 6.14M shares by Form 4, outside the officers-and-directors figure above · 7 people have not refiled in the last 18 months (155.9K shares), so they are not in the figure above
Latest trades
| Date | Insider | Type | Shares | Avg price | Owned after |
|---|---|---|---|---|---|
| Jun 11, 2026 | Benjamin Jacksonofficer: General Counsel | Sale | 2,179 | $2.01 | 161,756 |
| Jun 11, 2026 | Tiffany Eul Davis Inglisofficer: Chief Medical Officer | Sale | 362 | $2.01 | 92,075 |
| Jun 11, 2026 | Zhenya Lindgardtdirector, officer: Chief Executive Officer | Sale | 6,990 | $2.01 | 865,009 |
| Jun 11, 2026 | Austin Aertsofficer: Chief Financial Officer | Sale | 2,037 | $2.01 | 301,190 |
| Jun 11, 2026 | Dyaarl Lee Jr. Andersonofficer: Chief Commercial Officer | Sale | 4,739 | $2.01 | 77,998 |
| Jun 9, 2026 | Austin Aertsofficer: Chief Financial Officer | Sale | 5,440 | $2.08 | 303,227 |
| Jun 9, 2026 | Zhenya Lindgardtdirector, officer: Chief Executive Officer | Sale | 20,755 | $2.08 | 871,999 |
| Jun 8, 2026 | Sandra AJ Lawrencedirector | Sale | 1,560 | $2.15 | 16,473 |
| Mar 11, 2026 | Austin Aertsofficer: Chief Financial Officer | Sale | 1,019 | $2.04 | 264,452 |
| Mar 10, 2026 | Austin Aertsofficer: Chief Financial Officer | Sale | 6,069 | $1.90 | 265,471 |
CongressHouse and Senate disclosures
Not reported.