MBX Biosciences, Inc.
MBX- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001776111
In the last 90 days, MBX Biosciences, Inc. insiders filed 0 open-market purchases and 1 sale; 172 institutions reported holding it in 13F filings for Q2 2026, worth $3.06B in total; no superinvestor holds it.
Holders of 5% or more of MBX
Holders whose latest Schedule 13D or 13G filing reports 5% or more of MBX Biosciences, Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| Frazier Life Sciences Public Fund, L.P. | 13D/A | 11.70%5.22M shares | −1.90 ppfrom 13.60% | Aug 20, 20252 filings | Sep 30, 2025 | SEC |
| New Enterprise Associates 17, L.P. | 13D/A | 8.10%3.62M shares | – | Nov 10, 20251 filing | Nov 10, 2025 | SEC |
| OrbiMed Advisors LLC | 13D/A | 7.70%3.64M shares | −1.30 ppfrom 9.00% | Sep 30, 20252 filings | Feb 11, 2026 | SEC |
| Wellington Management Group LLP | 13G/A | 7.50%3.35M shares | −3.30 ppfrom 10.80% | May 12, 20254 filings | Feb 10, 2026 | SEC |
| Deep Track Capital, LP | 13G/A | 6.55%2.19M shares | – | Aug 14, 20251 filing | Aug 14, 2025 | SEC |
| Paradigm Biocapital Advisors LP | 13G | 5.20%2.49M shares | New | Jun 24, 20261 filing | Jun 24, 2026 | SEC |
| BlackRock, Inc. | 13G | 5.10%2.27M shares | New | Jan 21, 20261 filing | Jan 21, 2026 | 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
15 Schedule 13D and 13G filings on MBX Biosciences, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Jun 24, 20264:05 PM ET | Paradigm Biocapital Advisors LPand 3 others | 13G | 5.20%2.49M shares | New | Jun 16, 2026 | SEC |
| Feb 11, 20266:42 PM ET | OrbiMed Advisors LLCand 2 others | 13D/A | 7.70%3.64M shares | −1.30 ppfrom 9.00% | Feb 5, 2026 | SEC |
| Feb 10, 202611:21 AM ET | Wellington Management Group LLPand 3 others | 13G/A | 7.50%3.35M shares | −3.30 ppfrom 10.80% | Dec 31, 2025 | SEC |
| Jan 21, 202612:30 PM ET | BlackRock, Inc. | 13G | 5.10%2.27M shares | New | Dec 31, 2025 | SEC |
| Nov 14, 20254:05 PM ET | Hawryluk P. Kent | 13G/A | 4.30%2.00M shares | –Below 5% | Sep 30, 2025 | SEC |
| Nov 12, 20256:44 PM ET | Wellington Biomedical Innovation Master Investors (Cayman) II L.P. | 13G/A | 4.50%2.02M shares | –Below 5% | Sep 30, 2025 | SEC |
| Nov 10, 20255:08 PM ET | New Enterprise Associates 17, L.P.and 11 others | 13D/A | 8.10%3.62M shares | – | Nov 6, 2025 | SEC |
| Oct 6, 202512:22 PM ET | Wellington Management Group LLPand 3 others | 13G/A | 10.80%4.82M shares | +4.00 ppfrom 6.80% | Sep 30, 2025 | SEC |
| Sep 30, 20257:06 PM ET | OrbiMed Advisors LLCand 2 others | 13D/A | 9.00%4.00M shares | – | Sep 26, 2025 | SEC |
| Sep 30, 20256:15 PM ET | Norwest Venture Partners XVI, LPand 5 others | 13D/A | 4.80%2.14M shares | –Below 5% | Sep 26, 2025 | SEC |
| Sep 30, 20255:01 PM ET | Frazier Life Sciences Public Fund, L.P.and 13 others | 13D/A | 11.70%5.22M shares | −1.90 ppfrom 13.60% | Sep 26, 2025 | SEC |
| Aug 20, 20255:23 PM ET | Frazier Life Sciences Public Fund, L.P.and 16 others | 13D/A | 13.60%4.56M shares | – | Aug 18, 2025 | SEC |
| Aug 14, 20258:48 AM ET | Deep Track Capital, LPand 2 others | 13G/A | 6.55%2.19M shares | – | Jun 30, 2025 | SEC |
| Aug 12, 202510:34 AM ET | Wellington Management Group LLPand 3 others | 13G/A | 6.80%2.27M shares | −1.10 ppfrom 7.90% | Jun 30, 2025 | SEC |
| May 12, 202510:44 AM ET | Wellington Management Group LLPand 3 others | 13G/A | 7.90%2.64M shares | – | Mar 31, 2025 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell MBX Biosciences, Inc. shares.
No Form 144 notices for MBX Biosciences, Inc. are on file.