Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in IBIO held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | Affinity Asset Advisors, LLC | 3.1M | $5.9M | +51.0% | 19.679% | 0.34% |
| 2 | Frazier Life Sciences Management, L.P. | 2.0M | $3.7M | 0.0% | 12.372% | 0.10% |
| 3 | EcoR1 Capital, LLC | 1.6M | $3.0M | -28.9% | 10.026% | 0.13% |
| 4 | MILLENNIUM MANAGEMENT LLC | 1.5M | $2.9M | β | 9.816% | 0.00% |
| 5 | Logos Global Management LP | 1.3M | $2.5M | -35.0% | 8.233% | 0.12% |
| 6 | VANGUARD CAPITAL MANAGEMENT LLC | 1.1M | $2.1M | β | 6.893% | 0.00% |
| 7 | BALYASNY ASSET MANAGEMENT LLC | 1.0M | $1.9M | -7.8% | 6.403% | 0.01% |
| 8 | Ikarian Capital, LLC | 957K | $1.8M | 0.0% | 6.061% | 0.19% |
| 9 | CITADEL ADVISORS LLC | 956K | $1.8M | β | 6.057% | 0.00% |
| 10 | Sio Capital Management, LLC | 904K | $1.7M | +22.2% | 5.727% | 0.25% |
| 11 | MARSHALL WACE, LLP | 621K | $1.2M | +411.7% | 3.930% | 0.00% |
| 12 | ADAR1 Capital Management, LLC | 470K | $893K | +15.9% | 2.976% | 0.06% |
| 13 | SUSQUEHANNA INTERNATIONAL GROUP, LLP | 413K | $784K | β | 2.614% | 0.00% |
| 14 | TWO SIGMA INVESTMENTS, LP | 409K | $777K | -10.4% | 2.589% | 0.00% |
| 15 | Walleye Capital LLC | 389K | $738K | +95.9% | 2.461% | 0.00% |
| 16 | GEODE CAPITAL MANAGEMENT, LLC | 388K | $737K | +74.1% | 2.455% | 0.00% |
| 17 | NOESIS CAPITAL MANGEMENT CORP | 312K | $592K | +38.9% | 1.973% | 0.09% |
| 18 | BANK OF AMERICA CORP /DE/ | 290K | $552K | +150.8% | 1.839% | 0.00% |
| 19 | BOOTHBAY FUND MANAGEMENT, LLC | 254K | $483K | 0.0% | 1.611% | 0.01% |
| 20 | SILVERARC CAPITAL MANAGEMENT, LLC | 226K | $429K | +113.2% | 1.431% | 0.05% |
| 21 | VANGUARD FIDUCIARY TRUST CO | 205K | $390K | β | 1.298% | 0.00% |
| 22 | GOLDMAN SACHS GROUP INC | 200K | $380K | β | 1.268% | 0.00% |
| 23 | DAFNA Capital Management LLC | 194K | $368K | β | 1.226% | 0.08% |
| 24 | STATE STREET CORP | 141K | $268K | +93.7% | 0.894% | 0.00% |
| 25 | BlackRock, Inc. | 131K | $249K | +207.1% | 0.831% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in IBIO β a direct measure of their conviction.
Filings activity in IBIO during Q1 2026, grouped by how each filer changed its position.
Institutions that opened a new IBIO position in Q1 2026
Institutions that fully closed their IBIO position in Q1 2026
8 quarters of 13F filings Β· Ξ columns show change vs prior quarter
| Quarter | Inst. Holders | Ξ Holders | Ownership % | Ξ Ownership | Total 13F Value | Ξ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 50 | +2.0% | 138.25% | +20.00 pp | $37M | +17% |
| Q4 2025 | 49 | +53% | 118.25% | +107.41 pp | $32M | +991% |
| Q3 2025 | 32 | +3.2% | 10.84% | +1.80 pp | $3M | +20% |
| Q2 2025 | 31 | 11% | 9.04% | 29.93 pp | $2M | 77% |
| Q1 2025 | 35 | +9.4% | 38.97% | +14.98 pp | $10M | +62% |
| Q4 2024 | 32 | +0.0% | 23.99% | +2.31 pp | $6M | +11% |
| Q3 2024 | 32 | +6.7% | 21.68% | +5.14 pp | $6M | +31% |
| Q2 2024 | 30 | β | 16.54% | β | $4M | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying IBIO stock.
Based on Q1 2026 13F filings, institutional ownership of iBio, Inc. stands at 138.3%, held across 50 reporting institutions.
Affinity Asset Advisors, LLC is the largest reported institutional holder of IBIO, with approximately 3,107,200 shares worth $0.01B as of Q1 2026.
Yes β 4 widely-followed marquee investors appear among the top 25 institutional holders of IBIO, including MILLENNIUM MANAGEMENT LLC, CITADEL ADVISORS LLC, SUSQUEHANNA INTERNATIONAL GROUP, LLP, TWO SIGMA INVESTMENTS, LP.
Our composite Smart Money Score for IBIO is 71 out of 100 (Bullish). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
17 institutions opened new positions in IBIO during Q1 2026, while 16 fully exited. 16 added to existing positions and 11 trimmed.
IBIO institutional ownership rose by 20.00 percentage points quarter-over-quarter, with a net change of +1 holders.
The top 10 institutions account for 74.2% of all reported 13F value in IBIO, and the top 25 account for 98.1%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
iBio, Inc. (IBIO) Institutional Ownership