iBio, Inc.
Ownership
Ownership Structure
Who owns iBio, Inc. (IBIO)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 81.0% of the shares are freely tradable; institutional investors hold 49.4%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Affinity Asset Advisors, LLC | 13.34 | 4,007,881 | +29.0 | 06/30/2026 |
| Frazier Life Sciences Management, L.P. | 6.50 | 1,953,467 | +0.0 | 03/31/2026 |
| Millennium Management LLC | 5.50 | 1,651,473 | +6.6 | 06/30/2026 |
| Citadel Advisors Llc | 4.61 | 1,384,029 | +44.7 | 06/30/2026 |
| Vanguard Capital Management, LLC | 3.62 | 1,088,299 | +0.0 | 03/31/2026 |
| Balyasny Asset Management LLC | 3.36 | 1,010,955 | -7.8 | 03/31/2026 |
| Ikarian Capital, LLC | 3.18 | 957,062 | +0.0 | 03/31/2026 |
| Sio Capital Management, LLC | 3.01 | 904,268 | +0.0 | 06/30/2026 |
| Marshall Wace Asset Management Ltd | 2.07 | 620,602 | +411.7 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 2.28 | 1,465,833 | +0.0 | 08/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Data as of: September 28, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.