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
33.3M shares
Disclosed Ownership
2.27M 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

Reporting Managers (4)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
Wellington Management Group LLP 6.8% 2.27M 0 2.23M Taisia Lowe Regulatory Analyst
Wellington Group Holdings LLP 6.8% 2.27M 0 2.23M Taisia Lowe Regulatory Analyst
Wellington Investment Advisors Holdings LLP 6.8% 2.27M 0 2.23M Taisia Lowe Regulatory Analyst
Wellington Management Company LLP 6.8% 2.27M 0 2.22M Taisia Lowe Regulatory Analyst