Sera Prognostics, Inc.
SERA- Exchange
- Nasdaq
- Industry
- Services-Medical Laboratories
- SEC CIK
- 0001534969
In the last 90 days, Sera Prognostics, Inc. insiders filed 0 open-market purchases and 5 sales; 47 institutions reported holding it in 13F filings for Q2 2026, worth $31.0M in total; no superinvestor holds it.
Holders of 5% or more of SERA
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Sera Prognostics, Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Baker Bros. Advisors LP | 13D | 16.10%5.50M shares | New | Feb 14, 20251 filing | Feb 14, 2025 | SEC |
| Whetstone Capital Advisors, LLC | 13G | 9.90%3.63M shares | New | Sep 8, 20251 filing | Sep 8, 2025 | SEC |
| Chione Ltd | 13D/A | 7.60%2.61M shares | – | Feb 14, 20251 filing | Feb 14, 2025 | SEC |
| Standard Life Aberdeen plc | 13G | 6.07%2.23M shares | New | Aug 5, 20251 filing | Aug 5, 2025 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
6 Schedule 13D and 13G filings on Sera Prognostics, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Sep 8, 20254:52 PM ET | Whetstone Capital Advisors, LLCand 1 other | 13G | 9.90%3.63M shares | New | Jun 30, 2025 | SEC |
| Aug 14, 20256:08 PM ET | Ra Capital Management, L.P.and 3 others | 13G/A | 0.00%0 shares | –Below 5% | Jun 30, 2025 | SEC |
| Aug 5, 202510:22 AM ET | Standard Life Aberdeen plcand 1 other | 13G | 6.07%2.23M shares | New | Jun 30, 2025 | SEC |
| May 15, 20258:34 AM ET | Vivo Capital IX, LLC | 13G/A | 4.50%1.65M shares | –Below 5% | Mar 31, 2025 | SEC |
| Feb 14, 20255:00 PM ET | Chione Ltdand 4 others | 13D/A | 7.60%2.61M shares | – | Feb 11, 2025 | SEC |
| Feb 14, 20254:33 PM ET | Baker Bros. Advisors LPand 3 others | 13D | 16.10%5.50M shares | New | Feb 12, 2025 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Sera Prognostics, Inc. shares.
No Form 144 notices for Sera Prognostics, Inc. are on file.