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Ken Griffin's Amylyx Pharmaceuticals, Inc. (AMLX) position

Yes: as of Q1 2026, Ken Griffin holds 412K shares of AMLX worth an amount we cannot price (0.0% of the disclosed portfolio). Last quarter the position was increased by 19.3%. First disclosed Q1 2022.
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Current value
an amount we cannot price
Shares held
412K
% 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.

AMLX price vs Griffin's position

Dates
$17$17.5$18$18.5← Earlier —13 purchases, 4 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 +67K +19.3% 412K May 15, 2026
Q4 2025 Added +110K +47.0% 345K Feb 17, 2026
Q3 2025 Reduced −1.0M −81.1% 235K Nov 14, 2025
Q2 2025 Reduced −1.5M −54.9% 1.2M Aug 14, 2025
Q1 2025 Added +787K +39.9% 2.8M May 15, 2025
Q4 2024 Added +71K +3.7% 2.0M Feb 14, 2025
Q3 2024 Added +555K +41.3% 1.9M Nov 14, 2024
Q2 2024 Added +14K +1.1% 1.3M Aug 14, 2024
Q1 2024 Reduced −911K −40.6% 1.3M May 15, 2024
Q4 2023 Added +1.0M +82.6% 2.2M Feb 14, 2024
Q3 2023 Added +414K +50.9% 1.2M Nov 14, 2023
Q2 2023 Added +584K +255.3% 813K Aug 14, 2023
Q1 2023 Added +172K +303.3% 229K May 15, 2023
Q4 2022 Reduced −750K −93.0% 57K Feb 14, 2023
Q3 2022 Added +52K +6.9% 807K Nov 14, 2022
Q2 2022 Added +253K +50.4% 754K Aug 15, 2022
Q1 2022 New +502K 502K May 16, 2022
Data through Q1 2026 · filed May 15, 2026
17 grouped rows from 17 quarters

More Griffin positions

Common questions

Does Ken Griffin own AMLX?

Yes. As of Q1 2026, Ken Griffin disclosed 412K shares of AMLX, 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 AMLX?

Ken Griffin first disclosed a AMLX position in Q1 2022; 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 AMLX?

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

How many shares of AMLX does Ken Griffin own?

Ken Griffin disclosed 412K shares of AMLX 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 AMLX?

Ken Griffin began building the AMLX 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.