ZBIO Institutional Ownership & Shareholders
Zenas BioPharma, Inc. (ZBIO) is currently held by 146 institutional investors tracked by InsiderSet, with a combined reported market value of approximately $1.54B based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026.
Fmr Llc is currently the largest disclosed institutional shareholder of ZBIO tracked by InsiderSet, reporting ownership valued at approximately $241.28M in its June 30, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $269.90M, representing an estimated gain of +11.86% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 62% of the total disclosed ZBIO value among the investors covered in this analysis. Major shareholders include Fmr Llc, Sr One Capital Management, Lp, Nea Management Company, Llc, and several other long-term asset managers with concentrated positions in Zenas BioPharma, Inc. (ZBIO).
This page ranks the largest institutional ZBIO shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
146
Total Reported Value
$1.54B
Largest Holder
Fmr Llc
Largest Position
$241.28M
Insider Transactions (90d)
0
Latest Filing Quarter
Q2 2026
New Institutional Positions
110
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Fmr Llc | 0.01% | 9,506,701 | $241,280,071 | $269,895,241 | +$28,615,170 | +11.86% | |
| Sr One Capital Management, Lp | 12.31% | 5,037,854 | $127,860,735 | $143,024,675 | +$15,163,940 | +11.86% | |
| Nea Management Company, Llc | 6.43% | 4,023,219 | $102,109,298 | $114,219,187 | +$12,109,889 | +11.86% | |
| Enavate Sciences Gp, Llc | 28.80% | 3,919,159 | $99,468,255 | $111,264,924 | +$11,796,669 | +11.86% | |
| Federated Hermes, Inc. | 0.11% | 3,116,805 | $79,104,511 | $88,486,094 | +$9,381,583 | +11.86% | |
| Blackrock, Inc. | 0.00% | 2,686,225 | $68,176,389 | $76,261,928 | +$8,085,539 | +11.86% | |
| Capital International Investors | 0.01% | 2,502,912 | $63,523,907 | $71,057,672 | +$7,533,765 | +11.86% | |
| Polar Capital Holdings Plc | 0.17% | 2,412,772 | $61,236,153 | $68,498,597 | +$7,262,444 | +11.86% | |
| Royalty Pharma Sub-Manager, Llc | 25.05% | 2,388,150 | $60,611,247 | $67,799,579 | +$7,188,332 | +11.86% | |
| Fairmount Funds Management Llc | 3.96% | 2,359,025 | $59,872,055 | $66,972,720 | +$7,100,665 | +11.86% | |
| State Street Corp | 0.00% | 2,055,100 | $52,158,438 | $58,344,289 | +$6,185,851 | +11.86% | |
| Nvp Associates, Llc | 14.22% | 1,838,482 | $46,660,673 | $52,194,504 | +$5,533,831 | +11.86% | |
| Wellington Management Group Llp | 0.01% | 1,593,819 | $40,451,126 | $45,248,521 | +$4,797,395 | +11.86% | |
| Vanguard Capital Management Llc | 0.00% | 1,354,864 | $34,386,448 | $38,464,589 | +$4,078,141 | +11.86% | |
| Bank Of America Corp | 0.00% | 1,231,159 | $31,246,815 | $34,952,604 | +$3,705,789 | +11.86% | |
| Price T Rowe Associates Inc | 0.00% | 1,226,928 | $31,141,000 | $34,832,486 | +$3,691,486 | +11.85% | |
| Geode Capital Management, Llc | 0.00% | 882,654 | $22,406,450 | $25,058,547 | +$2,652,097 | +11.84% | |
| Alliancebernstein L.P. | 0.01% | 1,103,388 | $21,571,235 | $31,325,185 | +$9,753,950 | +45.22% | |
| Two Sigma Investments, Lp | 0.02% | 815,150 | $20,688,507 | $23,142,109 | +$2,453,602 | +11.86% | |
| Ecor1 Capital, Llc | 0.99% | 789,500 | $20,037,510 | $22,413,905 | +$2,376,395 | +11.86% | |
| Millennium Management Llc | 0.01% | 660,470 | $16,762,729 | $18,750,743 | +$1,988,014 | +11.86% | |
| Woodline Partners Lp | 0.05% | 590,539 | $14,987,880 | $16,765,402 | +$1,777,522 | +11.86% | |
| Balyasny Asset Management L.P. | 0.03% | 576,717 | $14,637,077 | $16,372,996 | +$1,735,919 | +11.86% | |
| Arrowmark Colorado Holdings Llc | 0.61% | 573,318 | $14,550,811 | $16,276,498 | +$1,725,687 | +11.86% | |
| Silverarc Capital Management, Llc | 1.44% | 509,789 | $12,938,445 | $14,472,910 | +$1,534,465 | +11.86% | |
| Rock Springs Capital Management Lp | 0.62% | 502,077 | $12,742,714 | $14,253,966 | +$1,511,252 | +11.86% | |
| Pivotal Bioventure Partners Investment Advisor Llc | 4.05% | 490,766 | $12,455,641 | $13,932,847 | +$1,477,206 | +11.86% | |
| Nextbio Capital Management Lp | 4.98% | 426,736 | $10,830,560 | $12,115,035 | +$1,284,475 | +11.86% | |
| Vestal Point Capital, Lp | 0.22% | 365,000 | $9,263,700 | $10,362,350 | +$1,098,650 | +11.86% | |
| Marshall Wace, Llp | 0.01% | 323,442 | $8,208,957 | $9,182,518 | +$973,561 | +11.86% | |
| Jennison Associates Llc | 0.00% | 314,049 | $7,970,564 | $8,915,851 | +$945,287 | +11.86% | |
| Vanguard Portfolio Management Llc | 0.00% | 304,870 | $7,737,601 | $8,655,259 | +$917,658 | +11.86% | |
| Charles Schwab Investment Management Inc | 0.00% | 302,085 | $7,666,917 | $8,576,193 | +$909,276 | +11.86% | |
| Northern Trust Corp | 0.00% | 281,140 | $7,135,334 | $7,981,565 | +$846,231 | +11.86% | |
| Goldman Sachs Group Inc | 0.00% | 271,163 | $6,882,117 | $7,698,318 | +$816,201 | +11.86% | |
| Vanguard Fiduciary Trust Co | 0.00% | 254,623 | $6,462,332 | $7,228,747 | +$766,415 | +11.86% | |
| Sphera Funds Management Ltd. | 0.84% | 230,834 | $5,858,567 | $6,553,377 | +$694,810 | +11.86% | |
| Walleye Capital Llc | 0.03% | 209,050 | $5,305,689 | $5,934,930 | +$629,241 | +11.86% | |
| Sio Capital Management, Llc | 0.91% | 208,557 | $5,293,177 | $5,920,933 | +$627,756 | +11.86% | |
| Citadel Advisors Llc | 0.00% | 195,780 | $4,968,897 | $5,558,194 | +$589,297 | +11.86% | |
| Ubs Group Ag | 0.00% | 178,089 | $4,519,899 | $5,055,947 | +$536,048 | +11.86% | |
| Voleon Capital Management Lp | 0.08% | 167,145 | $4,242,140 | $4,745,247 | +$503,107 | +11.86% | |
| Bnp Paribas Financial Markets | 0.00% | 151,086 | $3,834,563 | $4,289,332 | +$454,769 | +11.86% | |
| Morgan Stanley | 0.00% | 134,979 | $3,425,767 | $3,832,054 | +$406,287 | +11.86% | |
| Squarepoint Ops Llc | 0.01% | 125,185 | $3,177,195 | $3,554,002 | +$376,807 | +11.86% | |
| Barclays Plc | 0.00% | 115,965 | $2,943,193 | $3,292,246 | +$349,053 | +11.86% | |
| Seven Grand Managers, Llc | 0.10% | 100,000 | $2,538,000 | $2,839,000 | +$301,000 | +11.86% | |
| Birchview Capital, Lp | 1.11% | 93,601 | $2,375,593 | $2,657,332 | +$281,739 | +11.86% | |
| Verition Fund Management Llc | 0.01% | 72,988 | $1,852,435 | $2,072,129 | +$219,694 | +11.86% | |
| Bank Of New York Mellon Corp | 0.00% | 70,477 | $1,788,706 | $2,000,842 | +$212,136 | +11.86% |
Frequently asked questions about ZBIO
Who are the largest institutional holders of ZBIO?
The largest institutional holders of ZBIO reported in the latest SEC Form 13F filings include Fmr Llc, Sr One Capital Management, Lp, Nea Management Company, Llc, Enavate Sciences Gp, Llc, and Federated Hermes, Inc.. InsiderSet ranks institutional holders by their latest reported ZBIO position.
What is ZBIO institutional ownership?
This page tracks ZBIO positions reported by institutional investment managers through SEC Form 13F. Zenas BioPharma, Inc. (ZBIO) institutional ownership on InsiderSet reflects disclosed 13F holdings among the managers we analyze, not every shareholder of the stock.
How many institutions own ZBIO?
InsiderSet currently tracks 146 institutional managers reporting ZBIO holdings in the latest available 13F data. This count reflects institutions included in the SEC Form 13F filings analyzed by InsiderSet and should not be interpreted as the total number of ZBIO shareholders.
How much ZBIO stock do institutions own?
Institutional investment managers disclosed approximately $1.54B in ZBIO holdings for Q2 2026. This figure is reported 13F value as of the filing period, not necessarily today's market value.
When was ZBIO institutional ownership last updated?
The latest ZBIO institutional ownership data on InsiderSet is based on SEC Form 13F filings for the quarter ended June 30, 2026. Form 13F filings are generally reported after the quarter ends, so the holdings shown represent the latest publicly disclosed positions rather than real-time institutional holdings.
Are institutional ZBIO holdings real-time?
No. Form 13F data is not real-time. It represents positions reported by institutional investment managers as of the end of the reporting quarter. An institution may have changed its ZBIO position after the reporting date.
Are institutions buying or selling ZBIO?
Institutional buying and selling can be analyzed by comparing ZBIO positions across consecutive 13F reporting periods. InsiderSet's ZBIO Ownership Changes page shows institutions that increased, reduced, initiated, or exited positions based on reported 13F holdings. View ZBIO ownership changes.
How has ZBIO institutional ownership changed over time?
InsiderSet tracks ZBIO institutional holdings across multiple 13F reporting periods, allowing investors to compare institutional holder counts, reported value, and reported shares over time.