IO BIOTECH INC (IOBTQ)
Institutional ownership reported to the SEC as of Q1 2026, across 18 quarters.
Institutions report 3,391,578 shares against 71,948,842 outstanding. Shares only - option lines are excluded, which is why this can be compared with the company at all. The count comes from the cover page of the company's own most recent report, so it is dated when that was filed rather than at quarter end. Share count carried from an earlier filing (cy2025q3i).
Calls and puts are the parts of reported value carried in derivative lines rather than shares, and they point in opposite directions: a manager holding calls is positioned for the security, one holding puts against it - or hedging shares they already own, which is why index funds carry so many. Most sites add the two together and report one figure, which averages away the only interesting part.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| Ikarian Capital, LLC | $81.4K | 1,386,565 | 0.01% | 3q | HELD |
| BOOTHBAY FUND MANAGEMENT, LLC | $26.5K | 451,852 | 0.00% | 3q | HELD |
| GSA CAPITAL PARTNERS LLP | $20.0K | 348,352 | 0.00% | new | NEW |
| MARSHALL WACE, LLP | $18.1K | 301,291 | 0.00% | 11q | -29.8%-$7.7K |
| XTX Topco Ltd | $15.6K | 265,792 | 0.00% | 6q | +1575.4%+$14.7K |
| MORGAN STANLEY | $12.1K | 206,215 | 0.00% | 18q | -61.8%-$19.5K |
| MILLENNIUM MANAGEMENT LLC | $11.4K | 194,158 | 0.00% | 3q | +40.0%+$3.3K |
| CITIGROUP INC | $4.3K | 72,495 | 0.00% | 4q | -35.0%-$2.3K |
| JANE STREET GROUP, LLC | $3.4K | 57,974 | 0.00% | new | NEW |
| Beacon Pointe Advisors, LLC | $2.5K | 42,600 | 0.00% | 2q | -91.6%-$27.2K |
| GEODE CAPITAL MANAGEMENT, LLC | $2.0K | 33,307 | 0.00% | 18q | HELD |
| UBS Group AG | $1.8K | 30,977 | 0.00% | 8q | -28.9% |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q1 2026 | 12 | $199.0K | 3,391,578 | 2 | 2 | 5 | 0.0% |
| Q4 2025 | 22 | $4.8M | 7,848,183 | 5 | 3 | 8 | 0.0% |
| Q3 2025 | 21 | $3.6M | 9,895,875 | 9 | 5 | 5 | 0.0% |
| Q2 2025 | 26 | $25.3M | 18,182,707 | 5 | 5 | 8 | 0.0% |
| Q1 2025 | 22 | $20.8M | 19,111,617 | 1 | 3 | 8 | 0.0% |
| Q4 2024 | 27 | $18.2M | 19,737,862 | 9 | 1 | 4 | 0.0% |
| Q3 2024 | 20 | $24.8M | 23,636,882 | 5 | 3 | 3 | 0.0% |
| Q2 2024 | 21 | $32.4M | 26,721,876 | 3 | 4 | 4 | 3.6% |
| Q1 2024 | 19 | $56.7M | 31,781,378 | 3 | 4 | 4 | 3.0% |
| Q4 2023 | 19 | $61.4M | 31,682,403 | 3 | 4 | 5 | 3.0% |
| Q3 2023 | 19 | $43.1M | 29,668,665 | 8 | 4 | 1 | 3.2% |
| Q2 2023 | 15 | $24.0M | 12,246,779 | 3 | 3 | 1 | 0.0% |
| Q1 2023 | 17 | $26.1M | 13,917,553 | 2 | 2 | 3 | 0.0% |
| Q4 2022 | 17 | $32.8M | 14,281,285 | 0 | 4 | 5 | 0.0% |
| Q3 2022 | 20 | $41.6M | 15,335,530 | 5 | 3 | 3 | 0.0% |
| Q2 2022 | 18 | $72.2M | 15,453,557 | 5 | 3 | 3 | 0.0% |
| Q1 2022 | 19 | $76.9M | 14,858,852 | 4 | 2 | 2 | 0.0% |
| Q4 2021 | 20 | $92.6M | 15,038,466 | 20 | 0 | 0 | 0.0% |