Quick Takeaways
- WELLINGTON MANAGEMENT GROUP LLP filed SCHEDULE 13G/A for MBX Biosciences, Inc. Common Stock (MBX).
- Disclosed ownership: 6.8%.
- Date of event: 30 Jun 2025.
WELLINGTON MANAGEMENT GROUP LLP - 30 Jun 2025 SCHEDULE 13G/A Report for MBX Biosciences, Inc. Common Stock (MBX)
- Filing Manager
- WELLINGTON MANAGEMENT GROUP LLP
- Reporting Manager
- Wellington Management Group LLP
- Security
- MBX Biosciences, Inc. Common Stock
- Symbol
- MBX
- Shares outstanding
- 33,332,765 shares
- Disclosed Ownership
- 2,266,628 shares
- Ownership
- 6.8%
- Form type
- SCHEDULE 13G/A
- Filing time
- 12 Aug 2025, 10:34:26 UTC
- Date of event
- 30 Jun 2025
- Previous filing
- 12 May 2025
- Next filing
- 06 Oct 2025
- SEC
- View on sec.gov
Quoteable Key Fact
"WELLINGTON MANAGEMENT GROUP LLP disclosed 6.8% ownership in MBX Biosciences, Inc. Common Stock (MBX) on 30 Jun 2025."
What Changed
- Previous schedule filing date: 12 May 2025.
- Current filing was accepted on 12 Aug 2025, 10:34.
Why This Matters
- This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
- You can verify ownership claims directly against the original SEC filing.
Source Evidence
Backed by Schedule 13D/13G
See Original Filing
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
Reporting Managers (4)
| Name | Ownership | Shares Owned | sole voting power | shared voting power | Signature | Title | CIK |
|---|---|---|---|---|---|---|---|
| Wellington Management Group LLP | 6.8% | 2,266,628 | 0 | 2,226,590 | Taisia Lowe | Regulatory Analyst | |
| Wellington Group Holdings LLP | 6.8% | 2,266,628 | 0 | 2,226,590 | Taisia Lowe | Regulatory Analyst | |
| Wellington Investment Advisors Holdings LLP | 6.8% | 2,266,628 | 0 | 2,226,590 | Taisia Lowe | Regulatory Analyst | |
| Wellington Management Company LLP | 6.8% | 2,266,628 | 0 | 2,224,487 | Taisia Lowe | Regulatory Analyst |