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 |
|---|---|---|---|---|---|
| FMR LLC | 9,082,000 | $177.6M | 0.01% | +1,377,745+17.9% | Added |
| Sr One Capital Management, LP | 5,037,854 | $98.5M | 10.76% | 00.0% | Unchanged |
| NEA Management Company, LLC | 4,023,219 | $78.7M | 4.47% | +500,000+14.2% | Added |
| Enavate Sciences GP, LLC | 3,919,159 | $76.6M | 21.80% | 00.0% | Unchanged |
| Federated Hermes, Inc. | 3,127,031 | $61.1M | 0.10% | +411,453+15.2% | Added |
| Polar Capital Holdings Plc | 2,548,444 | $49.8M | 0.22% | +1,490,835+141.0% | Added |
| Capital International Investors | 2,434,000 | $47.6M | 0.01% | +2,434,000 | New |
| Royalty Pharma Sub-Manager, LLC | 2,388,150 | $46.7M | 27.02% | +1,125,000+89.1% | Added |
| Fairmount Funds Management LLC | 2,359,025 | $46.1M | 3.33% | +150,000+6.8% | Added |
| BlackRock, Inc. | 2,037,548 | $39.8M | 0.00% | +270,030+15.3% | Added |
| NVP Associates, LLC | 1,838,482 | $35.9M | 20.40% | 00.0% | Unchanged |
| Alliancebernstein L.P. | 897,321 | $32.6M | 0.01% | +878,971+4,790.0% | Added |
| State Street Corp | 1,470,923 | $28.8M | 0.00% | +1,032,629+235.6% | Added |
| Wellington Management Group LLP | 1,246,053 | $24.4M | 0.00% | +390,719+45.7% | Added |
| Vanguard Capital Management LLC | 1,245,391 | $24.3M | 0.00% | +1,245,391 | New |
| Silverarc Capital Management, LLC | 1,135,935 | $22.2M | 2.62% | +1,135,935 | New |
| EcoR1 Capital, LLC | 789,500 | $15.4M | 0.66% | 00.0% | Unchanged |
| Balyasny Asset Management LLC | 667,070 | $13.0M | 0.03% | +473,917+245.4% | Added |
| ArrowMark Colorado Holdings LLC | 658,909 | $12.9M | 0.34% | −92,252−12.3% | Reduced |
| Geode Capital Management, LLC | 655,785 | $12.8M | 0.00% | +67,392+11.5% | Added |
| Pivotal bioVenture Partners Investment Advisor LLC | 591,991 | $11.6M | 4.14% | 00.0% | Unchanged |
| Woodline Partners LP | 590,525 | $11.5M | 0.04% | +590,525 | New |
| Great Point Partners LLC | 524,066 | $10.2M | 2.51% | +524,066 | New |
| Rock Springs Capital Management LP | 502,077 | $9.82M | 0.58% | 00.0% | Unchanged |
| Marshall Wace, LLP | 501,928 | $9.81M | 0.01% | +494,828+6,969.4% | Added |
| Millennium Management LLC | 476,818 | $9.32M | 0.01% | +427,658+869.9% | Added |
| NEXTBio Capital Management LP | 426,736 | $8.34M | 3.87% | +104,753+32.5% | Added |
| Bank of America Corp | 388,347 | $7.59M | 0.00% | +341,187+723.5% | Added |
| Goldman Sachs Group Inc | 381,461 | $7.46M | 0.00% | +250,763+191.9% | Added |
| UBS Group AG | 367,405 | $7.18M | 0.00% | +297,910+428.7% | Added |
| Price T Rowe Associates Inc | 357,266 | $6.99M | 0.00% | −11,982−3.2% | Reduced |
| Sio Capital Management, LLC | 331,730 | $6.49M | 0.93% | +331,730 | New |
| Two Sigma Investments, LP | 275,056 | $5.38M | 0.00% | +259,956+1,721.6% | Added |
| Vanguard Portfolio Management LLC | 251,410 | $4.92M | 0.00% | +251,410 | New |
| Jennison Associates LLC | 250,000 | $4.89M | 0.00% | +250,000 | New |
| Charles Schwab Investment Management Inc | 224,402 | $4.39M | 0.00% | +11,209+5.3% | Added |
| Jefferies Financial Group Inc. | 219,947 | $4.30M | 0.05% | +219,947 | New |
| iA Global Asset Management Inc. | 215,830 | $4.22M | 0.06% | +215,830 | New |
| Sphera Funds Management Ltd. | 214,334 | $4.19M | 0.72% | +214,334 | New |
| Vestal Point Capital, LP | 200,000 | $3.91M | 0.11% | +200,000 | New |
| Northern Trust Corp | 194,640 | $3.81M | 0.00% | +39,274+25.3% | Added |
| Vanguard Fiduciary Trust Co | 179,388 | $3.51M | 0.00% | +179,388 | New |
| SEB Asset Management AB | 163,860 | $3.20M | 0.01% | +163,860 | New |
| Monashee Investment Management LLC | 150,000 | $2.93M | 1.60% | +150,000 | New |
| Maven Securities LTD | 150,000 | $2.93M | 0.17% | +150,000 | New |
| Walleye Capital LLC | 125,232 | $2.45M | 0.02% | +125,232 | New |
| Invesco Ltd. | 113,479 | $2.22M | 0.00% | −74,489−39.6% | Reduced |
| Atom Investors LP | 107,016 | $2.09M | 0.15% | +107,016 | New |
| Seven Grand Managers, LLC | 100,000 | $1.96M | 0.13% | +100,000 | New |
| Morgan Stanley | 93,396 | $1.83M | 0.00% | −34,939−27.2% | Reduced |
| Susquehanna International Group, LLP | 85,005 | $1.66M | 0.00% | +71,327+521.5% | Added |
| Exome Asset Management LLC | 80,730 | $1.58M | 0.93% | +80,730 | New |
| Voloridge Investment Management, LLC | 77,493 | $1.51M | 0.01% | −55,946−41.9% | Reduced |
| Birchview Capital, LP | 70,000 | $1.37M | 0.78% | +70,000 | New |
| Nuveen, LLC | 67,770 | $1.32M | 0.00% | +16,920+33.3% | Added |
| Citadel Advisors LLC | 66,870 | $1.31M | 0.00% | +42,411+173.4% | Added |
| Bank of New York Mellon Corp | 60,864 | $1.19M | 0.00% | +9,062+17.5% | Added |
| Jump Financial, LLC | 60,001 | $1.17M | 0.02% | +60,001 | New |
| AQR Capital Management LLC | 50,971 | $996.5K | 0.00% | −27,249−34.8% | Reduced |
| Rafferty Asset Management, LLC | 48,169 | $941.7K | 0.00% | +48,169 | New |
| Alps Advisors Inc | 43,694 | $854.2K | 0.00% | −383−0.9% | Reduced |
| Squarepoint Ops LLC | 42,874 | $838.2K | 0.00% | +27,333+175.9% | Added |
| DAFNA Capital Management LLC | 42,500 | $830.9K | 0.19% | +42,500 | New |
| Burkehill Global Management, LP | 40,000 | $782.0K | 0.04% | +40,000 | New |
| J. Goldman & Co LP | 36,797 | $719.4K | 0.03% | +36,797 | New |
| Swiss National Bank | 31,600 | $617.8K | 0.00% | 00.0% | Unchanged |
| Schroder Investment Management Group | 33,697 | $614.1K | 0.00% | −16,939−33.5% | Reduced |
| Voleon Capital Management LP | 29,612 | $578.9K | 0.01% | +19,425+190.7% | Added |
| Barclays PLC | 29,610 | $578.9K | 0.00% | −4,767−13.9% | Reduced |
| Jacobs Levy Equity Management, Inc | 27,532 | $538.3K | 0.00% | +27,532 | New |
| Rhumbline Advisers | 26,813 | $524.2K | 0.00% | +4,867+22.2% | Added |
| HRT Financial LP | 25,749 | $503.0K | 0.00% | +25,749 | New |
| JPMorgan Chase & Co | 25,109 | $457.6K | 0.00% | +3,383+15.6% | Added |
| Profund Advisors LLC | 21,416 | $418.7K | 0.02% | +21,416 | New |
| Quantinno Capital Management LP | 21,126 | $413.0K | 0.00% | +21,126 | New |
| Vanguard Global Advisers, LLC | 20,840 | $407.4K | 0.00% | +20,840 | New |
| State of Wisconsin Investment Board | 20,814 | $406.9K | 0.00% | +10,593+103.6% | Added |
| XTX Topco Ltd | 19,311 | $377.5K | 0.01% | +7,128+58.5% | Added |
| Deutsche Bank AG | 19,266 | $376.6K | 0.00% | +6,485+50.7% | Added |
| Aquatic Capital Management LLC | 18,640 | $364.4K | 0.01% | +18,640 | New |
| Allstate Corp | 18,223 | $356.3K | 0.00% | +18,223 | New |
| Schonfeld Strategic Advisors LLC | 17,638 | $344.8K | 0.00% | +8,511+93.3% | Added |
| CI Private Wealth, LLC | 16,845 | $329.3K | 0.00% | +16,845 | New |
| Prelude Capital Management, LLC | 16,645 | $325.4K | 0.02% | +16,645 | New |
| California State Teachers Retirement System | 15,819 | $309.3K | 0.00% | +118+0.8% | Added |
| UBS Asset Management Americas Inc | 15,523 | $303.5K | 0.00% | +7,123+84.8% | Added |
| Mirae Asset Global ETFs Holdings Ltd. | 14,386 | $276.8K | 0.00% | +5,606+63.8% | Added |
| China Universal Asset Management Co., Ltd. | 13,526 | $264.4K | 0.02% | +212+1.6% | Added |
| Scientech Research LLC | 12,952 | $253.2K | 0.21% | +12,952 | New |
| MetLife Investment Management | 12,909 | $252.4K | 0.00% | +2,809+27.8% | Added |
| Creative Planning | 12,658 | $247.5K | 0.00% | +385+3.1% | Added |
| Fox Run Management, L.L.C. | 13,331 | $243.0K | 0.04% | +13,331 | New |
| SEI Investments Co | 12,386 | $242.1K | 0.00% | +12,386 | New |
| Vanguard Asset Management, Ltd | 10,642 | $208.1K | 0.00% | +10,642 | New |
| Legal & General Group Plc | 10,432 | $203.9K | 0.00% | −2,595−19.9% | Reduced |
| BNP Paribas Arbitrage, SA | 9,999 | $195.5K | 0.00% | +2,861+40.1% | Added |
| Citigroup Inc | 9,888 | $193.3K | 0.00% | +7,537+320.6% | Added |
| Wells Fargo & Company | 8,885 | $173.7K | 0.00% | −12,266−58.0% | Reduced |
| Tower Research Capital LLC (TRC) | 7,235 | $141.4K | 0.00% | +6,440+810.1% | Added |
| Zurcher Kantonalbank (Zurich Cantonalbank) | 6,777 | $132.5K | 0.00% | +6,777 | New |