Metsera, Inc.
MTSRDelisted Nov 13, 2025- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0002040807
Metsera, Inc. was delisted on Nov 13, 2025; its insiders filed their last Form 4 on Nov 17, 2025; 155 institutions reported holding it in 13F filings for Q3 2025, worth $3.39B in total; no superinvestor held it.
Holders of 5% or more of MTSR
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Metsera, Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Validae Health, L.P. | 13G | 12.50%13.1M shares | New | Jun 3, 20251 filing | Jun 3, 2025 | SEC |
| Vanguard Group Inc | 13G | 5.53%5.82M shares | New | Oct 31, 20251 filing | Oct 31, 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
10 Schedule 13D and 13G filings on Metsera, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Feb 17, 202612:35 PM ET | Janus Henderson Group PLC | 13G/A | 3.10%3.24M shares | −2.00 ppfrom 5.10%Below 5% | Dec 31, 2025 | SEC |
| Nov 17, 20251:59 PM ET | FMR LLCand 1 other | 13G/A | 0.00%0 shares | −14.40 ppfrom 14.40%Below 5% | Nov 13, 2025 | SEC |
| Nov 14, 20256:22 PM ET | ARCH Venture Fund XII, L.P.and 10 others | 13D/A | 0.00%0 shares | −25.50 ppfrom 25.50%Below 5% | Nov 13, 2025 | SEC |
| Nov 14, 202510:29 AM ET | Janus Henderson Group PLC | 13G | 5.10%5.35M shares | New | Sep 30, 2025 | SEC |
| Nov 13, 20259:43 PM ET | Population Health Partners GP, LLCand 4 others | 13G/A | 0.00%0 shares | –Below 5% | Nov 13, 2025 | SEC |
| Oct 31, 202511:05 AM ET | Vanguard Group Inc | 13G | 5.53%5.82M shares | New | Sep 30, 2025 | SEC |
| Jun 3, 20254:30 PM ET | Validae Health, L.P.and 4 others | 13G | 12.50%13.1M shares | New | Mar 31, 2025 | SEC |
| May 12, 202510:36 AM ET | FMR LLCand 1 other | 13G/A | 14.40%15.2M shares | +3.90 ppfrom 10.50% | Mar 31, 2025 | SEC |
| Feb 10, 20259:30 PM ET | ARCH Venture Fund XII, L.P.and 10 others | 13D | 25.50%26.8M shares | New | Feb 3, 2025 | SEC |
| Feb 5, 202511:48 AM ET | FMR LLCand 1 other | 13G | 10.50%11.1M shares | New | Feb 3, 2025 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Metsera, Inc. shares.
No Form 144 notices for Metsera, Inc. are on file.