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Ken Griffin's IO Biotech, Inc. (IOBT) position

Not anymore: Ken Griffin fully exited IOBT in Q3 2025. The position peaked at an amount we cannot price in Q4 2021.
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Value at exit
an amount we cannot price
Shares at exit
29K
Quarter-end price
No quarter-end price available

Average buy price is hidden here because at least one covered purchase quarter has no usable local mean price.

IOBT price vs Griffin's position

Dates
Average closing price · filing quarter
Price range · filing quarter

Every quarterly change

Quarter Action Shares change Est. value change Δ Own Shares held Filing date
Q3 2025 Exited −29K −100.0% 0 Nov 14, 2025
Q2 2025 Reduced −17K −36.6% 29K Aug 14, 2025
Q1 2025 Reduced −225K −83.2% 46K May 15, 2025
Q4 2024 New +271K 271K Feb 14, 2025
Q2 2024 Added +28K +48.2% 87K Aug 14, 2024
Q1 2024 Added +7K +13.0% 59K May 15, 2024
Q4 2023 New +52K 52K Feb 14, 2024
Q2 2023 Reduced −9K −19.5% 38K Aug 14, 2023
Q1 2023 New +47K 47K May 15, 2023
Q3 2022 Added +28K +192.4% 42K Nov 14, 2022
Q2 2022 New +14K 14K Aug 15, 2022
Q4 2021 New +13K 13K Feb 14, 2022
Data through Q3 2025 · filed Nov 14, 2025
12 grouped rows from 12 quarters

More Griffin positions

Common questions

Does Ken Griffin own IOBT?

Not currently. Ken Griffin fully exited IOBT in Q3 2025, and the complete history is above. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

When did Ken Griffin buy IOBT?

Ken Griffin first disclosed a IOBT position in Q4 2021; every quarterly buy and sell since is in the table above. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

Did Ken Griffin sell IOBT?

Yes. Ken Griffin reduced and then fully exited IOBT by Q3 2025; the reductions are in the table above. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

How many shares of IOBT does Ken Griffin own?

None as of the latest filing: Ken Griffin has exited IOBT. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

What price did Ken Griffin pay for IOBT?

Ken Griffin began building the IOBT position before our 13F history starts, so an exact average buy price cannot be estimated without understating it. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

How are the estimated trade prices calculated?

13F filings disclose quarter-end holdings, not trade dates or execution prices. These estimates use each covered quarter's average market price; the add average excludes the opening position and quarters without price data. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.