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Ken Griffin's Cullinan Oncology, Inc. (CGEM) position

Yes: as of Q1 2026, Ken Griffin holds 253K shares of CGEM worth an amount we cannot price (0.0% of the disclosed portfolio). Held since at least Q1 2021; that opening coverage snapshot is not counted as a purchase.
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Current value
an amount we cannot price
Shares held
253K
% of portfolio
0.0%
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.

CGEM price vs Griffin's position

Dates
$16$16.5$17$17.5$18$18.5← Earlier —13 purchases, 7 sells
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
Q1 2026 Added +142K +129.1% 253K May 15, 2026
Q4 2025 Reduced −1.9M −94.4% 110K Feb 17, 2026
Q3 2025 Reduced −629K −24.1% 2.0M Nov 14, 2025
Q2 2025 Reduced −133K −4.9% 2.6M Aug 14, 2025
Q1 2025 Added +64K +2.4% 2.7M May 15, 2025
Q4 2024 Added +728K +37.2% 2.7M Feb 14, 2025
Q3 2024 Added +12K +0.6% 2.0M Nov 14, 2024
Q2 2024 Added +834K +75.2% 1.9M Aug 14, 2024
Q1 2024 Reduced −24K −2.1% 1.1M May 15, 2024
Q4 2023 Added +68K +6.4% 1.1M Feb 14, 2024
Q3 2023 Added +9K +0.8% 1.1M Nov 14, 2023
Q2 2023 Added +433K +69.5% 1.1M Aug 14, 2023
Q1 2023 Added +378K +154.2% 623K May 15, 2023
Q4 2022 Added +10K +4.0% 245K Feb 14, 2023
Q3 2022 Reduced −134K −36.2% 236K Nov 14, 2022
Q2 2022 Added +230K +164.5% 369K Aug 15, 2022
Q1 2022 Added +93K +200.5% 140K May 16, 2022
Q4 2021 Reduced −60K −56.2% 46K Feb 14, 2022
Q3 2021 Added +3K +2.9% 106K Nov 15, 2021
Q2 2021 Reduced −8K −7.4% 103K Aug 16, 2021
Q1 2021 First covered 111K May 21, 2021
Data through Q1 2026 · filed May 15, 2026
21 grouped rows from 21 quarters

More Griffin positions

Common questions

Does Ken Griffin own CGEM?

Yes. As of Q1 2026, Ken Griffin disclosed 253K shares of CGEM, worth an amount we cannot price. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

When did Ken Griffin buy CGEM?

Ken Griffin held CGEM since at least Q1 2021, when this filing coverage begins; the opening snapshot is not a disclosed purchase. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

Did Ken Griffin sell CGEM?

The quarter-by-quarter table above shows each sale and reduction Ken Griffin disclosed in CGEM. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

How many shares of CGEM does Ken Griffin own?

Ken Griffin disclosed 253K shares of CGEM as of Q1 2026. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

What price did Ken Griffin pay for CGEM?

Ken Griffin began building the CGEM 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.