Form
SCHEDULE 13D/A
Active or control-oriented beneficial ownership filing.
SR ONE CAPITAL MANAGEMENT, LLC - 13 Aug 2026 SCHEDULE 13D/A Report for Zenas BioPharma, Inc. Common stock, par value $0.0001 per share (ZBIO)
- Filing manager
- SR ONE CAPITAL MANAGEMENT, LLC
- Reporting owner
- SR One Capital Management, LLC
- Beneficially owned shares
- 5,037,854 shares
- Large-stake signal
-
Ownership
7.7%Beneficial ownership of this reported class.
Shares
5,037,854 sharesShares beneficially owned as disclosed.
Event date
13 Aug 2026Date tied to the ownership event or amendment.
Accepted by SEC
17 Aug 2026EDGAR 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
- 7.7%
- Symbol
- ZBIO
- Shares outstanding
- 65,426,675 shares
- SEC form
- SCHEDULE 13D/A
- Accepted by SEC
- 17 Aug 2026, 18:59:45 UTC
- Event date
- 13 Aug 2026
- Prior SEC filing
- 14 Oct 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.
5 source fields
Key filing fact
SR ONE CAPITAL MANAGEMENT, LLC disclosed 7.7% ownership in Zenas BioPharma, Inc. Common stock, par value $0.0001 per share (ZBIO) on 13 Aug 2026.
Key facts
- SR ONE CAPITAL MANAGEMENT, LLC filed SCHEDULE 13D/A for Zenas BioPharma, Inc. Common stock, par value $0.0001 per share (ZBIO).
- Disclosed ownership: 7.7%.
- Date of event: 13 Aug 2026.
Change
- Previous schedule filing date: 14 Oct 2025.
- Current filing was accepted on 17 Aug 2026, 18:59.
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 (8)
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 |
|---|---|---|---|---|---|---|---|
| SR One Capital Management, LLC | 7.7% | 5,037,854 | 0 | 5,037,854 | /s/ Sasha Keough | Sasha Keough, as attorney-in-fact for Simeon George, M.D., Managing Member | 0001853723 |
| SR One Capital Fund II Aggregator, LP | 3% | 1,946,564 | 0 | 1,946,564 | /s/ Sasha Keough | Sasha Keough, as attorney-in-fact for Simeon George, M.D., Managing Member | 0001966610 |
| SR One Capital Partners II, LP | 3% | 1,946,564 | 0 | 1,946,564 | /s/ Sasha Keough | Sasha Keough, as attorney-in-fact for Simeon George, M.D., Managing Member | 0001966609 |
| AMZL, LP | 2.9% | 1,917,895 | 0 | 1,917,895 | /s/ Sasha Keough | Sasha Keough, as attorney-in-fact for Simeon George, M.D., Managing Member | 0001971694 |
| SR One Capital SMA Partners, LP | 2.9% | 1,917,895 | 0 | 1,917,895 | /s/ Sasha Keough | Sasha Keough, as attorney-in-fact for Simeon George, M.D., Managing Member | 0002039882 |
| SR One Capital Opportunities Fund I, LP | 1.8% | 1,173,395 | 0 | 1,173,395 | /s/ Sasha Keough | Sasha Keough, as attorney-in-fact for Simeon George, M.D., Managing Member | 0001955314 |
| SR One Capital Opportunities Partners I, LP | 1.8% | 1,173,395 | 0 | 1,173,395 | /s/ Sasha Keough | Sasha Keough, as attorney-in-fact for Simeon George, M.D., Managing Member | |
| Simeon George | 7.7% | 5,037,854 | 0 | 5,037,854 | /s/ Sasha Keough | Sasha Keough, as attorney-in-fact for Simeon George, M.D. | 0001595117 |
CIK / CUSIP context first