Who owns Zenas BioPharma, Inc.?
Institutional ownership of ZBIO from SEC Form 13F filings across 112 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
112
13F holders
$875.0M
value, 2026 filers
57.3%
of shares outstanding (36.2M sh)
25
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30· % of fund = share of the manager's own book · % of co. = share of ZBIO's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | FMR LLC | 9.5M | $241.3M | 0.0% | 15.1% | +4.7% |
| 2 | FEDERATED HERMES, INC. | 3.1M | $79.1M | 0.1% | 4.9% | -0.3% |
| 3 | BlackRock, Inc. | 2.7M | $68.2M | 0.0% | 4.3% | +31.8% |
| 4 | Capital International Investors | 2.5M | $63.5M | 0.0% | 4% | +2.8% |
| 5 | Polar Capital Holdings Plc | 2.4M | $61.2M | 0.1% | 3.8% | -5.3% |
| 6 | WELLINGTON MANAGEMENT GROUP LLP | 1.6M | $40.5M | 0.0% | 2.5% | +27.9% |
| 7 | VANGUARD CAPITAL MANAGEMENT LLC | 1.4M | $34.4M | 0.0% | 2.1% | -45.6% |
| 8 | BANK OF AMERICA CORP /DE/ | 1.2M | $31.2M | 0.0% | 2% | +217.0% |
| 9 | PRICE T ROWE ASSOCIATES INC /MD/ | 1.2M | $31,141 | 0.0% | 1.9% | +243.4% |
| 10 | ALLIANCEBERNSTEIN L.P. | 1.1M | $21.6M | 0.0% | 1.7% | +23.0% |
| 11 | GEODE CAPITAL MANAGEMENT, LLC | 882,654 | $22.4M | 0.0% | 1.4% | +34.6% |
| 12 | TWO SIGMA INVESTMENTS, LP | 815,150 | $20.7M | 0.0% | 1.3% | +196.4% |
| 13 | MILLENNIUM MANAGEMENT LLC | 660,470 | $16.8M | 0.0% | 1% | +38.5% |
| 14 | Woodline Partners LP | 590,539 | $15.0M | 0.0% | 0.9% | -50.0% |
| 15 | Balyasny Asset Management L.P. | 576,717 | $14.6M | 0.0% | 0.9% | -13.5% |
| 16 | SILVERARC CAPITAL MANAGEMENT, LLC | 509,789 | $12.9M | 1.3% | 0.8% | -55.1% |
| 17 | MARSHALL WACE, LLP | 323,442 | $8.2M | 0.0% | 0.5% | -35.6% |
| 18 | JENNISON ASSOCIATES LLC | 314,049 | $8.0M | 0.0% | 0.5% | +25.6% |
| 19 | VANGUARD PORTFOLIO MANAGEMENT LLC | 304,870 | $7.7M | 0.0% | 0.5% | +21.3% |
| 20 | Sixth Street Partners Management Company, L.P.NEW | 302,085 | $7.7M | 1.3% | 0.5% | new |
| 21 | CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 302,085 | $7.7M | 0.0% | 0.5% | +34.6% |
| 22 | NORTHERN TRUST CORP | 281,140 | $7.1M | 0.0% | 0.4% | +44.4% |
| 23 | GOLDMAN SACHS GROUP INC | 271,163 | $6.9M | 0.0% | 0.4% | -28.9% |
| 24 | VANGUARD FIDUCIARY TRUST CO | 254,623 | $6.5M | 0.0% | 0.4% | +41.9% |
| 25 | iA Global Asset Management Inc. | 215,130 | $5,460 | 0.1% | 0.3% | -0.3% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.