Form
SCHEDULE 13D/A
Active or control-oriented beneficial ownership filing.
Helix Holdings II LLC - 11 Aug 2025 SCHEDULE 13D/A Report for BridgeBio Oncology Therapeutics, Inc. Common Stock (HLXB)
- Filing manager
- Helix Holdings II LLC
- Reporting owner
- Bihua Chen
- Beneficially owned shares
- 17,878,594 shares
- Large-stake signal
-
Ownership
23%Beneficial ownership of this reported class.
Shares
17,878,594 sharesShares beneficially owned as disclosed.
Event date
11 Aug 2025Date tied to the ownership event or amendment.
Accepted by SEC
13 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.
- Class ownership
- 23%
- Symbol
- HLXB
- Shares outstanding
- 79,108,823 shares
- SEC form
- SCHEDULE 13D/A
- Accepted by SEC
- 13 Aug 2025, 08:29:42 UTC
- Event date
- 11 Aug 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
Helix Holdings II LLC disclosed 23% ownership in BridgeBio Oncology Therapeutics, Inc. Common Stock (HLXB) on 11 Aug 2025.
Key facts
- Helix Holdings II LLC filed SCHEDULE 13D/A for BridgeBio Oncology Therapeutics, Inc. Common Stock (HLXB).
- Disclosed ownership: 23%.
- Date of event: 11 Aug 2025.
Change
- No earlier schedule filing is available for direct comparison.
- Current filing was accepted on 13 Aug 2025, 08:29.
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 (4)
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 |
|---|---|---|---|---|---|---|---|
| Helix Holdings II LLC | 5.7% | 4,528,186 | 4,528,186 | 0 | /s/ Bihua Chen | Bihua Chen, Managing Member | 0001869101 |
| Cormorant Global Healthcare Master Fund, LP | 7.5% | 5,952,356 | 5,952,356 | 0 | /s/ Bihua Chen | Bihua Chen, Managing Member of Cormorant Global Healthcare GP, LLC | 0001618442 |
| Cormorant Global Healthcare GP, LLC | 7.5% | 5,952,356 | 5,952,356 | 0 | /s/ Bihua Chen | Bihua Chen, Managing Member | 0001618451 |
| Bihua Chen | 23% | 17,878,594 | 17,878,594 | 0 | /s/ Bihua Chen | Bihua Chen, Self | 0001599214 |
CIK / CUSIP context first