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Ken Griffin's Annexon, Inc. (ANNX) position

Yes: as of Q1 2026, Ken Griffin holds 600K shares of ANNX worth $3.3M (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
$3.3M
Shares held
600K
% of portfolio
0.0%
Est. average buy price (i)
$4.50
Quarter-end price
$5.54

Estimated trade prices

Average price in quarters with purchases
$4.64
Average prices in quarters with sales
  • Q1 2025: $3.33 (13K shares sold)
  • Q1 2024: $5.19 (799K shares sold)
  • Q3 2023: $3.02 (48K shares sold)
  • Q3 2022: $5.41 (78K shares sold)
  • Q2 2022: $3.06 (257K shares sold)
  • Q4 2021: $16.16 (385K shares sold)
  • Q3 2021: $20.29 (133K shares sold)
  • Q2 2021: $22.16 (98K shares sold)

ANNX price vs Griffin's position

1Y 3Y 5Y MAX
Dates
$1$20$4020222023202420252026Sold 133K shares (6.7%) · Q3 2021. Average closing price $20.29 · Price range $16.35–$23.40133KsharessoldSold 385K shares (20.7%) · Q4 2021. Average closing price $16.16 · Price range $11.49–$22.00385KsharessoldSold 257K shares (14.8%) · Q2 2022. Average closing price $3.06 · Price range $2.11–$4.06257KsharessoldSold 78K shares (5.2%) · Q3 2022. Average closing price $5.41 · Price range $3.75–$6.6378KsharessoldAdded 461K shares (32.8%) · Q4 2022. Average closing price $5.49 · Price range $4.56–$6.61461KsharespurchasedAdded 546K shares (29.3%) · Q1 2023. Average closing price $5.50 · Price range $3.74–$7.46546KsharespurchasedSold 48K shares (6.5%) · Q3 2023. Average closing price $3.02 · Price range $2.13–$3.8448KsharessoldAdded 373K shares (54.4%) · Q4 2023. Average closing price $2.47 · Price range $1.63–$4.63373KsharespurchasedSold 799K shares (75.5%) · Q1 2024. Average closing price $5.19 · Price range $4.03–$7.81799KsharessoldNew position of 6K shares · Q3 2024. Average closing price $5.93 · Price range $4.49–$7.206KsharespurchasedAdded 19K shares (345.2%) · Q4 2024. Average closing price $6.15 · Price range $4.44–$7.6319KsharespurchasedSold 13K shares (50.4%) · Q1 2025. Average closing price $3.33 · Price range $1.93–$5.5013KsharessoldAdded 812 shares (6.5%) · Q2 2025. Average closing price $2.00 · Price range $1.38–$2.71812sharespurchasedAdded 154K shares (over 1,000%) · Q3 2025. Average closing price $2.48 · Price range $2.05–$3.37154KsharespurchasedAdded 108K shares (64.4%) · Q4 2025. Average closing price $3.82 · Price range $2.68–$5.19108KsharespurchasedAdded 325K shares (118.0%) · Q1 2026. Average closing price $5.63 · Price range $4.69–$6.96325Ksharespurchased← Earlier —1 sell
Average closing price · filing quarter
$5.63
Price range · filing quarter
$4.69 – $6.96
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Every quarterly change

Quarter Action Shares change Est. value change Δ Own Shares held Filing date
Q1 2026 Added +325K +$1.8M +118.0% 600K May 15, 2026
Q4 2025 Added +108K +$412K +64.4% 275K Feb 17, 2026
Q3 2025 Added +154K +$383K +1,162.5% 168K Nov 14, 2025
Q2 2025 Added +812 +$2K +6.5% 13K Aug 14, 2025
Q1 2025 Reduced −13K −$42K −50.4% 12K May 15, 2025
Q4 2024 Added +19K +$120K +345.2% 25K Feb 14, 2025
Q3 2024 New +6K +$33K – 6K Nov 14, 2024
Q1 2024 Reduced −799K −$4.1M −75.5% 259K May 15, 2024
Q4 2023 Added +373K +$922K +54.4% 1.1M Feb 14, 2024
Q3 2023 Reduced −48K −$144K −6.5% 685K Nov 14, 2023
Q2 2023 First covered – – – 733K Aug 14, 2023
Q1 2023 Added +546K +$3.0M +29.3% 2.4M May 15, 2023
Q4 2022 Added +461K +$2.5M +32.8% 1.9M Feb 14, 2023
Q3 2022 Reduced −78K −$419K −5.2% 1.4M Nov 14, 2022
Q2 2022 Reduced −257K −$786K −14.8% 1.5M Aug 15, 2022
Q1 2022 First covered – – – 1.7M May 16, 2022
Q4 2021 Reduced −385K −$6.2M −20.7% 1.5M Feb 14, 2022
Q3 2021 Reduced −133K −$2.7M −6.7% 1.9M Nov 15, 2021
Q2 2021 Reduced −98K −$2.2M −4.7% 2.0M Aug 16, 2021
Q1 2021 First covered – – – 2.1M May 21, 2021
Data through Q1 2026 · filed May 15, 2026
20 grouped rows from 20 quarters

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Common questions

Does Ken Griffin own ANNX?

Yes. As of Q1 2026, Ken Griffin disclosed 600K shares of ANNX, worth $3.3M. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

When did Ken Griffin buy ANNX?

Ken Griffin held ANNX 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 ANNX?

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

How many shares of ANNX does Ken Griffin own?

Ken Griffin disclosed 600K shares of ANNX 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 ANNX?

Ken Griffin's estimated average buy price for ANNX is $4.50, 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.