Form
SCHEDULE 13D/A
Active or control-oriented beneficial ownership filing.
New Enterprise Associates 17, L.P. - 06 Nov 2025 SCHEDULE 13D/A Report for MBX Biosciences, Inc. Common Stock, par value $0.0001 per share (MBX)
- Filing manager
- New Enterprise Associates 17, L.P.
- Reporting owner
- Edward T. Mathers
- Beneficially owned shares
- 3,619,474 shares
- Large-stake signal
-
Ownership
8.1%Beneficial ownership of this reported class.
Shares
3,619,474 sharesShares beneficially owned as disclosed.
Event date
06 Nov 2025Date tied to the ownership event or amendment.
Accepted by SEC
10 Nov 2025EDGAR acceptance date.
How to read this large-stake filing
- Schedule 13D/G filings focus on beneficial ownership stakes, not a full portfolio.
- Compare this filing with the holder history and issuer page before treating the percentage as a current position.
- Use amendments to understand whether the disclosed stake increased, decreased, or changed reporting status.
- Class ownership
- 8.1%
- Symbol
- MBX
- Shares outstanding
- 44,684,864 shares
- SEC form
- SCHEDULE 13D/A
- Accepted by SEC
- 10 Nov 2025, 17:08:55 UTC
- Event date
- 06 Nov 2025
- Source filing
- View source filing
Ownership signal
CIK-linked ownership evidence from parsed SEC filings.
2 signals
Subject security
Names, identifiers, and filing context for this profile.
2 source fields
Source evidence
Original filing metadata and source links for verification.
4 source fields
Key filing fact
New Enterprise Associates 17, L.P. disclosed 8.1% ownership in MBX Biosciences, Inc. Common Stock, par value $0.0001 per share (MBX) on 06 Nov 2025.
Key facts
- New Enterprise Associates 17, L.P. filed SCHEDULE 13D/A for MBX Biosciences, Inc. Common Stock, par value $0.0001 per share (MBX).
- Disclosed ownership: 8.1%.
- Date of event: 06 Nov 2025.
Change
- No earlier schedule filing is available for direct comparison.
- Current filing was accepted on 10 Nov 2025, 17:08.
Research use
- This page turns one Schedule 13D/G filing into a quick large-stake read before the raw reporting-person rows.
- Use the linked SEC filing as the source of truth for ownership percentages, shares, and reporting-party details.
Evidence
Backed by Schedule 13D/13G
View source filing
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
Reporting persons
Disclosed reporting parties (12)
Names, ownership percentages, voting power, signatures, titles, and CIKs as disclosed in this Schedule 13D/G filing.
| Name | Ownership | Shares owned | Sole voting power | Shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| New Enterprise Associates 17, L.P. | 8.1% | 3,614,486 | 0 | 3,614,486 | /s/ Zachary Bambach | Zachary Bambach as attorney-in-fact for Anthony A. Florence Jr., Managing Partner and Co-Chief Executive Officer | 0001768564 |
| NEA Partners 17, L.P. | 8.1% | 3,614,486 | 0 | 3,614,486 | /s/ Zachary Bambach | Zachary Bambach as attorney-in-fact for Anthony A. Florence Jr., Managing Partner and Co-Chief Executive Officer | 0001796820 |
| NEA 17 GP, LLC | 8.1% | 3,614,486 | 0 | 3,614,486 | /s/ Zachary Bambach | Zachary Bambach as attorney-in-fact for Anthony A. Florence Jr., Managing Partner and Co-Chief Executive Officer | 0001796821 |
| Forest Baskett | 8.1% | 3,614,486 | 0 | 3,614,486 | /s/ Zachary Bambach | Zachary Bambach as attorney-in-fact for Forest Baskett | 0001277631 |
| Ali Behbahani | 8.1% | 3,614,486 | 0 | 3,614,486 | /s/ Zachary Bambach | Zachary Bambach as attorney-in-fact for Ali Behbahani | 0001613867 |
| Carmen Chang | 8.1% | 3,614,486 | 0 | 3,614,486 | /s/ Zachary Bambach | Zachary Bambach as attorney-in-fact for Carmen Chang | 0001746342 |
| Anthony A. Florence, Jr. | 8.1% | 3,614,486 | 0 | 3,614,486 | /s/ Zachary Bambach | Zachary Bambach as attorney-in-fact for Anthony A. Florence, Jr. | 0001559827 |
| Mohamad H. Makhzoumi | 8.1% | 3,614,486 | 0 | 3,614,486 | /s/ Zachary Bambach | Zachary Bambach as attorney-in-fact for Mohamad H. Makhzoumi | 0001630226 |
| Edward T. Mathers | 8.1% | 3,619,474 | 4,988 | 3,614,486 | /s/ Zachary Bambach | Zachary Bambach as attorney-in-fact for Edward T. Mathers | 0001328625 |
| Scott D. Sandell | 8.1% | 3,614,486 | 0 | 3,614,486 | /s/ Zachary Bambach | Zachary Bambach as attorney-in-fact for Scott D. Sandell | 0001237289 |
| Paul Walker | 8.1% | 3,614,486 | 0 | 3,614,486 | /s/ Zachary Bambach | Zachary Bambach as attorney-in-fact for Paul Walker | 0001553150 |
| Rick Yang | 8.1% | 3,614,486 | 0 | 3,614,486 | /s/ Zachary Bambach | Zachary Bambach as attorney-in-fact for Rick Yang | 0001851328 |
CIK / CUSIP context first