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ZBIO

Zenas BioPharma, Inc.
$28.24 -1.17 (-3.98%) At close · Jul 16
Going-concern doubt — cleared May 13, 2026

The latest filing states the doubt was alleviated.

“During the first quarter of 2026, the Company alleviated the uncertainty associated with its ability to continue as a going concern through the execution of its senior secured term loan, the issuance of convertible senior notes and the concurrent equity offering”
View the 10-Q filed May 13, 2026
Market Cap
$1.78B
Shares
63,133,377

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

The Jun 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out.
Holders: 140
Total Value: $1,084,683,604
Total Shares: 55,477,283
Showing 1–100 of 145 holdings by value · page 1 of 2

Institutional Ownership Trend

8 quarters

Holder Concentration

Across 139 13F filers
Top Holder
16.4%
Sep 2024 → Mar 2026 · range 14.1% – 19.8%
of institutional value
Top 5
45.4%
Sep 2024 → Mar 2026 · range 45.4% – 54.5%
of institutional value
Top 10
65.6%
Sep 2024 → Mar 2026 · range 65.6% – 80.0%
of institutional value
HHI
609
Sep 2024 → Mar 2026 · range 609 – 875
Broadly held
Showing 100 of 145
All Common Calls Puts
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Holder Value (USD) % of 13F Shares Open
Mega FMR LLC $177,553,098 16.37% 9,082,000
Small SR One Capital Management, LP $98,490,045 9.08% 5,037,854
Mid NEA Management Company, LLC $78,653,931 7.25% 4,023,219
Small ENAVATE SCIENCES GP, LLC $76,619,558 7.06% 3,919,159
Large FEDERATED HERMES, INC. $61,133,455 5.64% 3,127,031
Large Polar Capital Holdings Plc $49,822,080 4.59% 2,548,444
Mega Capital International Investors $47,584,700 4.39% 2,434,000
Mid Fairmount Funds Management LLC $46,118,938 4.25% 2,359,025
Mega BlackRock, Inc. $39,834,059 3.67% 2,037,548
Small NVP ASSOCIATES, LLC $35,942,323 3.31% 1,838,482
Mega STATE STREET CORP $28,756,544 2.65% 1,470,923
Mega WELLINGTON MANAGEMENT GROUP LLP $24,360,334 2.25% 1,246,053
Mega VANGUARD CAPITAL MANAGEMENT LLC $24,347,394 2.24% 1,245,391
Small SILVERARC CAPITAL MANAGEMENT, LLC $22,207,529 2.05% 1,135,935
Mega ALLIANCEBERNSTEIN L.P. $17,542,625 1.62% 897,321
Mid EcoR1 Capital, LLC $15,434,725 1.42% 789,500
Large Balyasny Asset Management L.P. $13,041,218 1.20% 667,070
Mid ArrowMark Colorado Holdings LLC $12,881,670 1.19% 658,909
Mega GEODE CAPITAL MANAGEMENT, LLC $12,820,596 1.18% 655,785
Small Pivotal bioVenture Partners Investment Advisor LLC Venture Capital $11,573,424 1.07% 591,991
Large Woodline Partners LP $11,544,763 1.06% 590,525
Small GREAT POINT PARTNERS LLC $10,245,490 0.94% 524,066
Mid Rock Springs Capital Management LP $9,815,605 0.90% 502,077
Large MARSHALL WACE, LLP $9,812,691 0.90% 501,928
Mega MILLENNIUM MANAGEMENT LLC $9,321,791 0.86% 476,818
Small NEXTBio Capital Management LP $8,342,688 0.77% 426,736
Mega BANK OF AMERICA CORP /DE/ Bank $7,592,183 0.70% 388,347
Mega GOLDMAN SACHS GROUP INC $7,457,561 0.69% 381,461
Mega UBS Group AG $7,182,767 0.66% 367,405
Mega PRICE T ROWE ASSOCIATES INC /MD/ $6,984,550 0.64% 357,266
Small Sio Capital Management, LLC $6,485,321 0.60% 331,730
Mega TWO SIGMA INVESTMENTS, LP $5,377,344 0.50% 275,056
Mega JENNISON ASSOCIATES LLC $4,887,500 0.45% 250,000
Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC $4,387,059 0.40% 224,402
Large Jefferies Financial Group Inc. $4,299,963 0.40% 219,947
Mid iA Global Asset Management Inc. $4,219,476 0.39% 215,830
Small SPHERA FUNDS MANAGEMENT LTD. $4,190,229 0.39% 214,334
Mid Vestal Point Capital, LP $3,910,000 0.36% 200,000
Mega NORTHERN TRUST CORP Bank $3,805,210 0.35% 194,640
Mega VANGUARD FIDUCIARY TRUST CO Bank $3,507,035 0.32% 179,388
Large SEB Asset Management AB $3,203,463 0.30% 163,860
Small Monashee Investment Management LLC $2,932,500 0.27% 150,000
Small Maven Securities LTD Broker-Dealer $2,932,500 0.27% 150,000
Large Walleye Capital LLC $2,448,285 0.23% 125,232
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $2,402,695 0.22% 122,900
Mega Invesco Ltd. $2,218,513 0.20% 113,479
Mid Atom Investors LP $2,092,162 0.19% 107,016
Mid SEVEN GRAND MANAGERS, LLC $1,955,000 0.18% 100,000
Mega MORGAN STANLEY $1,825,889 0.17% 93,396
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $1,661,847 0.15% 85,005
Small Exome Asset Management LLC $1,578,271 0.15% 80,730
Large VOLORIDGE INVESTMENT MANAGEMENT, LLC $1,514,988 0.14% 77,493
Small Birchview Capital, LP $1,368,500 0.13% 70,000
Mega Nuveen, LLC $1,324,903 0.12% 67,770
Mega CITADEL ADVISORS LLC $1,307,308 0.12% 66,870
Mega Bank of New York Mellon Corp Bank $1,189,891 0.11% 60,864
Mid Jump Financial, LLC $1,173,018 0.11% 60,001
Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP $1,135,855 0.10% 58,100
Mega AQR CAPITAL MANAGEMENT LLC $996,480 0.09% 50,971
Large Rafferty Asset Management, LLC $941,703 0.09% 48,169
Mega JANE STREET GROUP, LLC $868,020 0.08% 44,400
Large ALPS ADVISORS INC $854,217 0.08% 43,694
Large Squarepoint Ops LLC $838,186 0.08% 42,874
Small DAFNA Capital Management LLC $830,875 0.08% 42,500
Mid Burkehill Global Management, LP $782,000 0.07% 40,000
Mid J. Goldman & Co LP $719,381 0.07% 36,797
Mega CITADEL ADVISORS LLC $668,610 0.06% 34,200
Mega SCHRODER INVESTMENT MANAGEMENT GROUP $658,776 0.06% 33,697
Mega Swiss National Bank Bank $617,780 0.06% 31,600
Mid Voleon Capital Management LP $578,914 0.05% 29,612
Mega BARCLAYS PLC $578,875 0.05% 29,610
Mega JANE STREET GROUP, LLC $557,175 0.05% 28,500
Large JACOBS LEVY EQUITY MANAGEMENT, INC $538,250 0.05% 27,532
Mega RHUMBLINE ADVISERS $524,194 0.05% 26,813
Mega CITADEL ADVISORS LLC $520,030 0.05% 26,600
Large HRT FINANCIAL LP $503,392 0.05% 25,749
Mega JPMORGAN CHASE & CO $490,879 0.05% 25,109
Mid Y-Intercept (Hong Kong) Ltd $439,886 0.04% 17,332
Mid PROFUND ADVISORS LLC $418,682 0.04% 21,416
Large Quantinno Capital Management LP $413,013 0.04% 21,126
Mega Vanguard Global Advisers, LLC $407,422 0.04% 20,840
Large STATE OF WISCONSIN INVESTMENT BOARD $406,913 0.04% 20,814
Mid XTX Topco Ltd $377,530 0.03% 19,311
Mega DEUTSCHE BANK AG\ Bank $376,650 0.03% 19,266
Mid Aquatic Capital Management LLC $364,412 0.03% 18,640
Mid ALLSTATE CORP $356,259 0.03% 18,223
Large Schonfeld Strategic Advisors LLC $344,822 0.03% 17,638
Large Corient Private Wealth LLC $329,319 0.03% 16,845
Mid PRELUDE CAPITAL MANAGEMENT, LLC $325,409 0.03% 16,645
Large CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Pension $309,261 0.03% 15,819
Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC $303,474 0.03% 15,523
Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. Mutual Fund $281,246 0.03% 14,386
Mid China Universal Asset Management Co., Ltd. $264,433 0.02% 13,526
Small FOX RUN MANAGEMENT, L.L.C. $260,621 0.02% 13,331
Small Scientech Research LLC $253,211 0.02% 12,952
Large MetLife Investment Management, LLC $252,370 0.02% 12,909
Large Creative Planning $247,463 0.02% 12,658
Large SEI INVESTMENTS CO $242,145 0.02% 12,386
Mega VANGUARD ASSET MANAGEMENT, Ltd $208,051 0.02% 10,642
Mega Legal & General Group Plc $203,944 0.02% 10,432
Key facts CIK 1953926 CUSIP 98937L105 13F (30d) 4 filings 4 filers Visit website Investor relations

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