IOBTQ
IO Biotech, Inc.Company with tickers: IOBT
CIK
1865494
CUSIP
449778109
Shares Outstanding
71,948,842
13F Activity (30d)
13 filings
11 filers
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Holders: 12
Total Value: $200,097
Total Shares: 3,391,581
Institutional Ownership Trend
Holder Concentration
Across 12 13F filers · Δ vs Dec 31, 2025Top Holder
40.9%
+8.9 pts
Top 5
81.2%
+8.0 pts
Top 10
98.1%
+3.5 pts
HHI
2,175
Moderately concentrated
+535
Quarterly Activity
vs Dec 31, 2025
New
2
Increased
2
Decreased
5
Sold Out
12
Unchanged
3
Holder count:
-10
Institutional value:
-95.8%
Shares held:
-56.8%
Top Buyers
vs Dec 31, 2025| Institution | Added | Now Holds | Open |
|---|---|---|---|
| Mid XTX Topco Ltd | +249,928 | 265,792 | |
| Mega MILLENNIUM MANAGEMENT LLC | +55,442 | 194,158 |
Top Sellers
vs Dec 31, 2025| Institution | Sold | Now Holds | Open |
|---|---|---|---|
| Mid Beacon Pointe Advisors, LLC | −463,400 | 42,600 | |
| Mega MORGAN STANLEY | −332,967 | 206,215 | |
| Large MARSHALL WACE, LLP | −128,047 | 301,291 | |
| Mega CITIGROUP INC | −38,952 | 72,495 | |
| Mega UBS Group AG | −12,598 | 30,980 |
Top New Positions
vs Dec 31, 2025| Institution | Acquired | Value (USD) | Open |
|---|---|---|---|
| Mid GSA CAPITAL PARTNERS LLP | 348,352 | $20,552 | |
| Mega JANE STREET GROUP, LLC | 57,974 | $3,419 |
Top Sold-Out Positions
vs Dec 31, 2025| Institution | Previously Held | Last Value (USD) | Open |
|---|---|---|---|
| Mid NOVO HOLDINGS A/S | 2,512,453 | $1,530,083 | |
| Mega BANK OF AMERICA CORP /DE/ | 799,953 | $487,171 | |
| Micro Dauntless Investment Group, LLC | 451,641 | $275,049 | |
| Large RENAISSANCE TECHNOLOGIES LLC | 207,601 | $126,429 | |
| Mid BRIDGEWAY CAPITAL MANAGEMENT, LLC | 75,000 | $45,675 |
| Holder | Value (USD) | % of 13F | Shares | Type | Discretion | Filed | Open | |||
|---|---|---|---|---|---|---|---|---|---|---|
| Mid Ikarian Capital, LLC | $81,807 | 40.88% | 1,386,565 | Shares | Sole | 2026-05-15 | ||||
| Mid BOOTHBAY FUND MANAGEMENT, LLC | $26,659 | 13.32% | 451,852 | Shares | Other | 2026-05-15 | ||||
| Mid GSA CAPITAL PARTNERS LLP | $20,552 | 10.27% | 348,352 | Shares | Sole | 2026-05-08 | ||||
| Large MARSHALL WACE, LLP | $17,776 | 8.88% | 301,291 | Shares | Other | 2026-05-15 | ||||
| Mid XTX Topco Ltd | $15,681 | 7.84% | 265,792 | Shares | Defined | 2026-05-15 | ||||
| Mega MORGAN STANLEY | $12,166 | 6.08% | 206,215 | Shares | Defined | 2026-05-15 | ||||
| Mega MILLENNIUM MANAGEMENT LLC | $11,455 | 5.72% | 194,158 | Shares | Sole | 2026-05-15 | ||||
| Mega CITIGROUP INC | $4,277 | 2.14% | 72,495 | Shares | Defined | 2026-05-11 | ||||
| Mega JANE STREET GROUP, LLC | $3,419 | 1.71% | 57,974 | Shares | Defined | 2026-05-12 | ||||
| Mid Beacon Pointe Advisors, LLC | $2,513 | 1.26% | 42,600 | Shares | Sole | 2026-05-15 | ||||
| Mega GEODE CAPITAL MANAGEMENT, LLC | $1,965 | 0.98% | 33,307 | Shares | Defined | 2026-05-15 | ||||
| Mega UBS Group AG | $1,827 | 0.91% | 30,980 | Shares | Defined | 2026-05-05 | ||||
| No holders match your search. | ||||||||||