Zenas BioPharma, Inc. (ZBIO) Institutional Shareholders
Zenas BioPharma, Inc. (ZBIO) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $1.55B in ZBIO holdings during the latest filing period.
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 $299.46M, representing an estimated gain of +24.11% 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
141
Total Reported Value
$1.55B
Largest Holder
Fmr Llc
Largest Position
$241.28M
Insider Transactions (90d)
0
Latest Filing Quarter
Q2 2026
New Institutional Positions
125
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 | $299,461,082 | +$58,181,011 | +24.11% | |
| Sr One Capital Management, Lp | 12.31% | 5,037,854 | $127,860,735 | $158,692,401 | +$30,831,666 | +24.11% | |
| Nea Management Company, Llc | 6.43% | 4,023,219 | $102,109,298 | $126,731,399 | +$24,622,101 | +24.11% | |
| Enavate Sciences Gp, Llc | 28.80% | 3,919,159 | $99,468,255 | $123,453,509 | +$23,985,254 | +24.11% | |
| Federated Hermes, Inc. | 0.11% | 3,116,805 | $79,104,511 | $98,179,358 | +$19,074,847 | +24.11% | |
| Blackrock, Inc. | 0.00% | 2,686,225 | $68,176,389 | $84,616,088 | +$16,439,699 | +24.11% | |
| Capital International Investors | 0.01% | 2,502,912 | $63,523,907 | $78,841,728 | +$15,317,821 | +24.11% | |
| Polar Capital Holdings Plc | 0.17% | 2,412,772 | $61,236,153 | $76,002,318 | +$14,766,165 | +24.11% | |
| Royalty Pharma Sub-Manager, Llc | 25.05% | 2,388,150 | $60,611,247 | $75,226,725 | +$14,615,478 | +24.11% | |
| Fairmount Funds Management Llc | 3.96% | 2,359,025 | $59,872,055 | $74,309,288 | +$14,437,233 | +24.11% | |
| State Street Corp | 0.00% | 2,055,100 | $52,158,438 | $64,735,650 | +$12,577,212 | +24.11% | |
| Nvp Associates, Llc | 14.22% | 1,838,482 | $46,660,673 | $57,912,183 | +$11,251,510 | +24.11% | |
| Wellington Management Group Llp | 0.01% | 1,593,819 | $40,451,126 | $50,205,299 | +$9,754,173 | +24.11% | |
| Vanguard Capital Management Llc | 0.00% | 1,354,864 | $34,386,448 | $42,678,216 | +$8,291,768 | +24.11% | |
| Bank Of America Corp | 0.00% | 1,231,159 | $31,246,815 | $38,781,509 | +$7,534,694 | +24.11% | |
| Price T Rowe Associates Inc | 0.00% | 1,226,928 | $31,141,000 | $38,648,232 | +$7,507,232 | +24.11% | |
| Geode Capital Management, Llc | 0.00% | 882,654 | $22,406,450 | $27,803,601 | +$5,397,151 | +24.09% | |
| Alliancebernstein L.P. | 0.01% | 1,103,388 | $21,571,235 | $34,756,722 | +$13,185,487 | +61.13% | |
| Two Sigma Investments, Lp | 0.02% | 815,150 | $20,688,507 | $25,677,225 | +$4,988,718 | +24.11% | |
| Ecor1 Capital, Llc | 0.99% | 789,500 | $20,037,510 | $24,869,250 | +$4,831,740 | +24.11% | |
| Millennium Management Llc | 0.01% | 660,470 | $16,762,729 | $20,804,805 | +$4,042,076 | +24.11% | |
| Woodline Partners Lp | 0.05% | 590,539 | $14,987,880 | $18,601,979 | +$3,614,099 | +24.11% | |
| Balyasny Asset Management L.P. | 0.03% | 576,717 | $14,637,077 | $18,166,586 | +$3,529,509 | +24.11% | |
| Arrowmark Colorado Holdings Llc | 0.61% | 573,318 | $14,550,811 | $18,059,517 | +$3,508,706 | +24.11% | |
| Silverarc Capital Management, Llc | 1.44% | 509,789 | $12,938,445 | $16,058,354 | +$3,119,909 | +24.11% | |
| Rock Springs Capital Management Lp | 0.62% | 502,077 | $12,742,714 | $15,815,426 | +$3,072,712 | +24.11% | |
| Pivotal Bioventure Partners Investment Advisor Llc | 4.05% | 490,766 | $12,455,641 | $15,459,129 | +$3,003,488 | +24.11% | |
| Nextbio Capital Management Lp | 4.98% | 426,736 | $10,830,560 | $13,442,184 | +$2,611,624 | +24.11% | |
| Vestal Point Capital, Lp | 0.22% | 365,000 | $9,263,700 | $11,497,500 | +$2,233,800 | +24.11% | |
| Marshall Wace, Llp | 0.01% | 323,442 | $8,208,957 | $10,188,423 | +$1,979,466 | +24.11% | |
| Jennison Associates Llc | 0.00% | 314,049 | $7,970,564 | $9,892,544 | +$1,921,980 | +24.11% | |
| Vanguard Portfolio Management Llc | 0.00% | 304,870 | $7,737,601 | $9,603,405 | +$1,865,804 | +24.11% | |
| Charles Schwab Investment Management Inc | 0.00% | 302,085 | $7,666,917 | $9,515,678 | +$1,848,761 | +24.11% | |
| Northern Trust Corp | 0.00% | 281,140 | $7,135,334 | $8,855,910 | +$1,720,576 | +24.11% | |
| Goldman Sachs Group Inc | 0.00% | 271,163 | $6,882,117 | $8,541,635 | +$1,659,518 | +24.11% | |
| Vanguard Fiduciary Trust Co | 0.00% | 254,623 | $6,462,332 | $8,020,625 | +$1,558,293 | +24.11% | |
| Sphera Funds Management Ltd. | 0.84% | 230,834 | $5,858,567 | $7,271,271 | +$1,412,704 | +24.11% | |
| Ia Global Asset Management Inc. | 0.06% | 215,130 | $5,460,000 | $6,776,595 | +$1,316,595 | +24.11% | |
| Walleye Capital Llc | 0.03% | 209,050 | $5,305,689 | $6,585,075 | +$1,279,386 | +24.11% | |
| Sio Capital Management, Llc | 0.91% | 208,557 | $5,293,177 | $6,569,546 | +$1,276,369 | +24.11% | |
| Citadel Advisors Llc | 0.00% | 195,780 | $4,968,897 | $6,167,070 | +$1,198,173 | +24.11% | |
| Ubs Group Ag | 0.00% | 178,089 | $4,519,899 | $5,609,804 | +$1,089,905 | +24.11% | |
| Voleon Capital Management Lp | 0.08% | 167,145 | $4,242,140 | $5,265,068 | +$1,022,928 | +24.11% | |
| Bnp Paribas Financial Markets | 0.00% | 151,086 | $3,834,563 | $4,759,209 | +$924,646 | +24.11% | |
| Morgan Stanley | 0.00% | 134,979 | $3,425,767 | $4,251,839 | +$826,072 | +24.11% | |
| Squarepoint Ops Llc | 0.01% | 125,185 | $3,177,195 | $3,943,328 | +$766,133 | +24.11% | |
| Barclays Plc | 0.00% | 115,965 | $2,943,193 | $3,652,898 | +$709,705 | +24.11% | |
| Seven Grand Managers, Llc | 0.10% | 100,000 | $2,538,000 | $3,150,000 | +$612,000 | +24.11% | |
| Birchview Capital, Lp | 1.11% | 93,601 | $2,375,593 | $2,948,432 | +$572,839 | +24.11% | |
| Verition Fund Management Llc | 0.01% | 72,988 | $1,852,435 | $2,299,122 | +$446,687 | +24.11% |
Frequently asked questions about ZBIO
Who owns the most ZBIO stock?
The largest holders of ZBIO are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for Zenas BioPharma, Inc. (ZBIO).
Is ZBIO widely held by superinvestors?
Many widely followed stocks like ZBIO appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly ZBIO is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.