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Ken Griffin's aTyr Pharma, Inc. (ATYR) position

Yes: as of Q1 2026, Ken Griffin holds 47K shares of ATYR worth $37K (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
$37K
Shares held
47K
% of portfolio
0.0%
Est. average buy price (i)
$0.84
Quarter-end price
$0.78

Estimated trade prices

Average price in quarters with purchases
$3.20
Average prices in quarters with sales
  • Q2 2025: $3.93 (142K shares sold)
  • Q4 2024: $3.03 (954K shares sold)
  • Q3 2024: $1.82 (879K shares sold)
  • Q2 2024: $1.74 (58K shares sold)

ATYR price vs Griffin's position

1Y 3Y 5Y MAX
Dates
$0.3$5$1020252026Sold 58K shares (3.1%) · Q2 2024. Average closing price $1.74 · Price range $1.46–$1.9858KsharessoldSold 879K shares (47.6%) · Q3 2024. Average closing price $1.82 · Price range $1.51–$2.23879KsharessoldSold 954K shares (98.7%) · Q4 2024. Average closing price $3.03 · Price range $1.72–$3.77954KsharessoldAdded 249K shares (over 1,000%) · Q1 2025. Average closing price $3.65 · Price range $3.02–$4.43249KsharespurchasedSold 142K shares (54.4%) · Q2 2025. Average closing price $3.93 · Price range $2.62–$5.50142KsharessoldNew position of 47K shares · Q1 2026. Average closing price $0.84 · Price range $0.67–$1.0547Ksharespurchased← Earlier —7 purchases, 3 sells
Average closing price · filing quarter
$0.84
Price range · filing quarter
$0.67 – $1.05
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Every quarterly change

Quarter Action Shares change Est. value change Δ Own Shares held Filing date
Q1 2026 New +47K +$40K – 47K May 15, 2026
Q2 2025 Reduced −142K −$558K −54.4% 119K Aug 14, 2025
Q1 2025 Added +249K +$907K +2,011.5% 261K May 15, 2025
Q4 2024 Reduced −954K −$2.9M −98.7% 12K Feb 14, 2025
Q3 2024 Reduced −879K −$1.6M −47.6% 967K Nov 14, 2024
Q2 2024 Reduced −58K −$101K −3.1% 1.8M Aug 14, 2024
Q1 2024 Added +150K – +8.5% 1.9M May 15, 2024
Q4 2023 Reduced −31K – −1.7% 1.8M Feb 14, 2024
Q3 2023 Added +1.5M – +457.4% 1.8M Nov 14, 2023
Q2 2023 Added +279K – +682.1% 320K Aug 14, 2023
Q1 2023 Added +3K – +8.2% 41K May 15, 2023
Q4 2022 New +38K – – 38K Feb 14, 2023
Q1 2022 Reduced −34K – −17.4% 160K May 16, 2022
Q4 2021 Reduced −7K – −3.5% 193K Feb 14, 2022
Q3 2021 Added +171K – +570.9% 200K Nov 15, 2021
Q2 2021 Added +16K – +121.8% 30K Aug 16, 2021
Q1 2021 First covered – – – 13K May 21, 2021
Data through Q1 2026 · filed May 15, 2026
17 grouped rows from 17 quarters

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Common questions

Does Ken Griffin own ATYR?

Yes. As of Q1 2026, Ken Griffin disclosed 47K shares of ATYR, worth $37K. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

When did Ken Griffin buy ATYR?

Ken Griffin held ATYR 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 ATYR?

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

How many shares of ATYR does Ken Griffin own?

Ken Griffin disclosed 47K shares of ATYR 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 ATYR?

Ken Griffin's estimated average buy price for ATYR is $0.84, from quarter-average prices weighted by the shares added each quarter. 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.