Zenas BioPharma, Inc.
ZBIO- Exchange
- Nasdaq
- Industry
- Pharmaceutical Preparations
- SEC CIK
- 0001953926
No open-market purchases or sales by Zenas BioPharma, Inc. insiders were filed in the last 90 days; 144 institutions reported holding it in 13F filings for Q2 2026, worth $1.55B in total; no superinvestor holds it.
13F holders, Q1 2026
Institutional positions in Zenas BioPharma, Inc. as of Mar 31, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 140
- +23 vs. Q4 2025
- Shares held
- 57.8M
- +16.4M (+39.7%) vs. Q4 2025
- Total value
- $1.14B
- −$353.3M (−23.6%) vs. Q4 2025
- New holders
- 51
- 58 more added
- Sold out
- 28
- 17 more reduced
2 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q4 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting ZBIO on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 144 | $1.55B |
| Q1 2026 | 140 | $1.14B |
| Q4 2025 | 119 | $1.55B |
| Q3 2025 | 80 | $774.5M |
| Q2 2025 | 73 | $330.0M |
| Q1 2025 | 67 | $256.7M |
| Q4 2024 | 65 | $259.6M |
| Q3 2024 | 44 | $418.5M |
| Q2 2024 | 0 | $0 |
| Q1 2024 | 0 | $0 |
| Q4 2023 | 0 | $0 |
| Q3 2023 | 0 | $0 |
| Q2 2023 | 0 | $0 |
| Q1 2023 | 0 | $0 |
| Q4 2022 | 0 | $0 |
| Q3 2022 | 0 | $0 |
| Q2 2022 | 0 | $0 |
| Q1 2022 | 0 | $0 |
| Q4 2021 | 0 | $0 |
| Q3 2021 | 0 | $0 |
| Q2 2021 | 0 | $0 |
| Q1 2021 | 0 | $0 |
Institutions, Q1 2026
Shares, value and share of portfolio for each institution holding Zenas BioPharma, Inc.; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Vestal Point Capital, LP | 200,000 | $3.91M | 0.11% | +200,000 | New |
| Sphera Funds Management Ltd. | 214,334 | $4.19M | 0.72% | +214,334 | New |
| iA Global Asset Management Inc. | 215,830 | $4.22M | 0.06% | +215,830 | New |
| Jefferies Financial Group Inc. | 219,947 | $4.30M | 0.05% | +219,947 | New |
| Charles Schwab Investment Management Inc | 224,402 | $4.39M | 0.00% | +11,209+5.3% | Added |
| Jennison Associates LLC | 250,000 | $4.89M | 0.00% | +250,000 | New |
| Vanguard Portfolio Management LLC | 251,410 | $4.92M | 0.00% | +251,410 | New |
| Two Sigma Investments, LP | 275,056 | $5.38M | 0.00% | +259,956+1,721.6% | Added |
| Sio Capital Management, LLC | 331,730 | $6.49M | 0.93% | +331,730 | New |
| Price T Rowe Associates Inc | 357,266 | $6.99M | 0.00% | −11,982−3.2% | Reduced |
| UBS Group AG | 367,405 | $7.18M | 0.00% | +297,910+428.7% | Added |
| Goldman Sachs Group Inc | 381,461 | $7.46M | 0.00% | +250,763+191.9% | Added |
| Bank of America Corp | 388,347 | $7.59M | 0.00% | +341,187+723.5% | Added |
| NEXTBio Capital Management LP | 426,736 | $8.34M | 3.87% | +104,753+32.5% | Added |
| Millennium Management LLC | 476,818 | $9.32M | 0.01% | +427,658+869.9% | Added |
| Marshall Wace, LLP | 501,928 | $9.81M | 0.01% | +494,828+6,969.4% | Added |
| Rock Springs Capital Management LP | 502,077 | $9.82M | 0.58% | 00.0% | Unchanged |
| Great Point Partners LLC | 524,066 | $10.2M | 2.51% | +524,066 | New |
| Woodline Partners LP | 590,525 | $11.5M | 0.04% | +590,525 | New |
| Pivotal bioVenture Partners Investment Advisor LLC | 591,991 | $11.6M | 4.14% | 00.0% | Unchanged |
| Geode Capital Management, LLC | 655,785 | $12.8M | 0.00% | +67,392+11.5% | Added |
| ArrowMark Colorado Holdings LLC | 658,909 | $12.9M | 0.34% | −92,252−12.3% | Reduced |
| Balyasny Asset Management LLC | 667,070 | $13.0M | 0.03% | +473,917+245.4% | Added |
| EcoR1 Capital, LLC | 789,500 | $15.4M | 0.66% | 00.0% | Unchanged |
| Silverarc Capital Management, LLC | 1,135,935 | $22.2M | 2.62% | +1,135,935 | New |
| Vanguard Capital Management LLC | 1,245,391 | $24.3M | 0.00% | +1,245,391 | New |
| Wellington Management Group LLP | 1,246,053 | $24.4M | 0.00% | +390,719+45.7% | Added |
| State Street Corp | 1,470,923 | $28.8M | 0.00% | +1,032,629+235.6% | Added |
| Alliancebernstein L.P. | 897,321 | $32.6M | 0.01% | +878,971+4,790.0% | Added |
| NVP Associates, LLC | 1,838,482 | $35.9M | 20.40% | 00.0% | Unchanged |
| BlackRock, Inc. | 2,037,548 | $39.8M | 0.00% | +270,030+15.3% | Added |
| Fairmount Funds Management LLC | 2,359,025 | $46.1M | 3.33% | +150,000+6.8% | Added |
| Royalty Pharma Sub-Manager, LLC | 2,388,150 | $46.7M | 27.02% | +1,125,000+89.1% | Added |
| Capital International Investors | 2,434,000 | $47.6M | 0.01% | +2,434,000 | New |
| Polar Capital Holdings Plc | 2,548,444 | $49.8M | 0.22% | +1,490,835+141.0% | Added |
| Federated Hermes, Inc. | 3,127,031 | $61.1M | 0.10% | +411,453+15.2% | Added |
| Enavate Sciences GP, LLC | 3,919,159 | $76.6M | 21.80% | 00.0% | Unchanged |
| NEA Management Company, LLC | 4,023,219 | $78.7M | 4.47% | +500,000+14.2% | Added |
| Sr One Capital Management, LP | 5,037,854 | $98.5M | 10.76% | 00.0% | Unchanged |
| FMR LLC | 9,082,000 | $177.6M | 0.01% | +1,377,745+17.9% | Added |
| Novo Holdings A/S | 0 | $0 | 0.00% | −1,450,000−100.0% | Sold out |
| Vivo Capital, LLC | 0 | $0 | 0.00% | −853,495−100.0% | Sold out |
| Point72 Asset Management, L.P. | 0 | $0 | 0.00% | −368,400−100.0% | Sold out |
| Skandinaviska Enskilda Banken AB (publ) | 0 | $0 | 0.00% | −163,860−100.0% | Sold out |
| Eversept Partners, LP | 0 | $0 | 0.00% | −121,016−100.0% | Sold out |
| Superstring Capital Management LP | 0 | $0 | 0.00% | −83,353−100.0% | Sold out |
| Voya Investment Management LLC | 0 | $0 | 0.00% | −14,725−100.0% | Sold out |
| Los Angeles Capital Management LLC | 0 | $0 | 0.00% | −14,447−100.0% | Sold out |
| Gsa Capital Partners LLP | 0 | $0 | 0.00% | −8,956−100.0% | Sold out |
| Intech Investment Management LLC | 0 | $0 | 0.00% | −8,863−100.0% | Sold out |
| Janus Henderson Group PLC | 0 | $0 | 0.00% | −7,900−100.0% | Sold out |
| Mariner, LLC | 0 | $0 | 0.00% | −7,676−100.0% | Sold out |
| VARCOV Co. | 0 | $0 | 0.00% | −7,335−100.0% | Sold out |
| Manufacturers Life Insurance Company, The | 0 | $0 | 0.00% | −6,256−100.0% | Sold out |
| Brevan Howard Capital Management LP | 0 | $0 | 0.00% | −6,173−100.0% | Sold out |
| ProShare Advisors LLC | 0 | $0 | 0.00% | −5,820−100.0% | Sold out |
| Simplex Trading, LLC | 0 | $0 | 0.00% | −1,974−100.0% | Sold out |
| Amalgamated Bank | 0 | $0 | 0.00% | −593−100.0% | Sold out |
| Royal Bank of Canada | 0 | $0 | 0.00% | −544−100.0% | Sold out |
| Daiwa Securities Group Inc. | 0 | $0 | 0.00% | −179−100.0% | Sold out |
| Farther Finance Advisors, LLC | 0 | $0 | 0.00% | −86−100.0% | Sold out |
| Aster Capital Management (DIFC) Ltd | 0 | $0 | 0.00% | −42−100.0% | Sold out |
| IFP Advisors, Inc | 0 | $0 | 0.00% | −12−100.0% | Sold out |
| SJS Investment Consulting Inc. | 0 | $0 | 0.00% | −7−100.0% | Sold out |
| SageView Advisory Group, LLC | 0 | $0 | 0.00% | −4−100.0% | Sold out |
| SRS Capital Advisors, Inc. | 0 | $0 | 0.00% | −4−100.0% | Sold out |
| Clearstead Advisors, LLC | 0 | $0 | 0.00% | −1−100.0% | Sold out |
| Keating Financial Advisory Services, Inc. | 0 | $0 | 0.00% | −1−100.0% | Sold out |
| Vanguard Group Inc | – | – | – | – | Not filed |
| Global Retirement Partners, LLC | – | – | – | – | Not filed |