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Ken Griffin's X4 Pharmaceuticals, Inc. (XFOR) position

Not anymore: Ken Griffin fully exited XFOR in Q1 2026. The position peaked at an amount we cannot price in Q2 2021.
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Value at exit
an amount we cannot price
Shares at exit
129K
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.

XFOR price vs Griffin's position

Dates
$3.65$3.7$3.75$3.8$3.85← Earlier —5 purchases, 8 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 Exited −129K −100.0% 0 May 15, 2026
Q4 2025 New +129K 129K Feb 17, 2026
Q2 2024 Reduced −754K −98.9% 8K Aug 14, 2024
Q1 2024 Reduced −965K −55.9% 763K May 15, 2024
Q4 2023 Reduced −71K −3.9% 1.7M Feb 14, 2024
Q3 2023 Reduced −1.3M −41.5% 1.8M Nov 14, 2023
Q2 2023 Added +3.1M +17,013.2% 3.1M Aug 14, 2023
Q1 2023 Reduced −927K −98.1% 18K May 15, 2023
Q4 2022 New +945K 945K Feb 14, 2023
Q2 2022 Reduced −10K −18.5% 45K Aug 15, 2022
Q1 2022 Reduced −22K −28.6% 56K May 16, 2022
Q4 2021 Added +44K +129.0% 78K Feb 14, 2022
Q3 2021 Reduced −13K −27.9% 34K Nov 15, 2021
Q2 2021 New +47K 47K Aug 16, 2021
Data through Q1 2026 · filed May 15, 2026
14 grouped rows from 14 quarters

More Griffin positions

Common questions

Does Ken Griffin own XFOR?

Not currently. Ken Griffin fully exited XFOR in Q1 2026, 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 XFOR?

Ken Griffin first disclosed a XFOR position in Q2 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 XFOR?

Yes. Ken Griffin reduced and then fully exited XFOR by Q1 2026; 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 XFOR does Ken Griffin own?

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

What price did Ken Griffin pay for XFOR?

Ken Griffin began building the XFOR 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.