Form
SCHEDULE 13G/A
Passive or exempt beneficial ownership filing.
Bain Capital Life Sciences Opportunities III, LP - 30 Jun 2025 SCHEDULE 13G/A Report for CABALETTA BIO, INC. Common Stock, $0.00001 par value per share (CABA)
- Filing manager
- Bain Capital Life Sciences Opportunities III, LP
- Reporting owner
- Bain Capital Life Sciences Opportunities III, LP
- Beneficially owned shares
- 9,677,125 shares
- Class ownership
- 10%
- Large-stake signal
-
Ownership
10%Beneficial ownership of this reported class.
Shares
9,677,125 sharesShares beneficially owned as disclosed.
Event date
30 Jun 2025Date tied to the ownership event or amendment.
Accepted by SEC
14 Aug 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.
- Symbol
- CABA
- Shares outstanding
- 96,868,118 shares
- Form type
- SCHEDULE 13G/A
- Accepted by SEC
- 14 Aug 2025, 16:00:11 UTC
- Event date
- 30 Jun 2025
- SEC filing
- View on sec.gov
Ownership signal
2 signals
Subject security
2 source fields
Source evidence
4 source fields
Key filing fact
Bain Capital Life Sciences Opportunities III, LP disclosed 10% ownership in CABALETTA BIO, INC. Common Stock, $0.00001 par value per share (CABA) on 30 Jun 2025.
Key facts
- Bain Capital Life Sciences Opportunities III, LP filed SCHEDULE 13G/A for CABALETTA BIO, INC. Common Stock, $0.00001 par value per share (CABA).
- Disclosed ownership: 10%.
- Date of event: 30 Jun 2025.
Change
- No earlier schedule filing is available for direct comparison.
- Current filing was accepted on 14 Aug 2025, 16:00.
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
See Original Filing
Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.
Reporting persons
Disclosed reporting parties (1)
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 |
|---|---|---|---|---|---|---|---|
| Bain Capital Life Sciences Opportunities III, LP | 10% | 9,677,125 | 0 | 9,677,125 | /s/ Andrew Hack | Andrew Hack, Partner of Bain Capital Life Sciences Investors, LLC |
CIK / CUSIP context first