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Ken Griffin's Alnylam Pharmaceuticals, Inc. (ALNY) position

Yes: as of Q1 2026, Ken Griffin holds 23K shares of ALNY worth $7.7M (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
$7.7M
Shares held
23K
% of portfolio
0.0%
Est. average buy price (i)
$276.34
est. since Q2 2024
Quarter-end price
$330.87

Estimated trade prices

Average price in quarters with purchases
$253.79
Average prices in quarters with sales
  • Q1 2026: $340.17 (15K shares sold)
  • Q4 2025: $442.56 (183K shares sold)
  • Q3 2025: $407.23 (379K shares sold)
  • Q1 2025: $257.00 (61K shares sold)
  • Q3 2024: $260.36 (343K shares sold)
  • Q1 2024: $166.82 (27K shares sold)
  • Q2 2023: $198.26 (75K shares sold)
  • Q4 2022: $213.29 (81K shares sold)
  • Q1 2022: $152.35 (69K shares sold)
  • Q3 2021: $187.58 (18K shares sold)
  • Q2 2021: $146.46 (84K shares sold)

ALNY price vs Griffin's position

1Y 3Y 5Y MAX
Dates
$100$200$400$60020222023202420252026Sold 18K shares (46.4%) · Q3 2021. Average closing price $187.58 · Price range $169.75–$207.7318KsharessoldAdded 50K shares (238.9%) · Q4 2021. Average closing price $185.86 · Price range $159.56–$209.2950KsharespurchasedSold 69K shares (97.0%) · Q1 2022. Average closing price $152.35 · Price range $127.18–$173.9169KsharessoldAdded 6K shares (265.0%) · Q2 2022. Average closing price $141.87 · Price range $120.42–$169.296KsharespurchasedSold 81K shares (98.3%) · Q4 2022. Average closing price $213.29 · Price range $185.11–$241.3181KsharessoldAdded 103K shares (over 1,000%) · Q1 2023. Average closing price $210.20 · Price range $182.66–$235.53103KsharespurchasedSold 75K shares (71.7%) · Q2 2023. Average closing price $198.26 · Price range $185.01–$212.0575KsharessoldNew position of 67K shares · Q4 2023. Average closing price $170.34 · Price range $151.41–$196.5767KsharespurchasedSold 27K shares (40.0%) · Q1 2024. Average closing price $166.82 · Price range $146.51–$198.2027KsharessoldSold 343K shares (93.5%) · Q3 2024. Average closing price $260.36 · Price range $233.81–$287.01343KsharessoldAdded 41K shares (173.2%) · Q4 2024. Average closing price $262.99 · Price range $232.27–$300.5541KsharespurchasedSold 61K shares (93.5%) · Q1 2025. Average closing price $257.00 · Price range $233.07–$290.7061KsharessoldAdded 597K shares (over 1,000%) · Q2 2025. Average closing price $276.71 · Price range $224.32–$326.09597KsharespurchasedSold 379K shares (63.1%) · Q3 2025. Average closing price $407.23 · Price range $311.12–$482.13379KsharessoldSold 183K shares (82.7%) · Q4 2025. Average closing price $442.56 · Price range $391.17–$491.22183KsharessoldSold 15K shares (39.1%) · Q1 2026. Average closing price $340.17 · Price range $306.66–$422.5015Ksharessold← Earlier —1 sell
Average closing price · filing quarter
$340.17
Price range · filing quarter
$306.66 – $422.50
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Every quarterly change

Quarter Action Shares change Est. value change Δ Own Shares held Filing date
Q1 2026 Reduced −15K −$5.1M −39.1% 23K May 15, 2026
Q4 2025 Reduced −183K −$81M −82.7% 38K Feb 17, 2026
Q3 2025 Reduced −379K −$154M −63.1% 222K Nov 14, 2025
Q2 2025 Added +597K +$165M +14,092.6% 601K Aug 14, 2025
Q1 2025 Reduced −61K −$16M −93.5% 4K May 15, 2025
Q4 2024 Added +41K +$11M +173.2% 65K Feb 14, 2025
Q3 2024 Reduced −343K −$89M −93.5% 24K Nov 14, 2024
Q2 2024 First covered – – – 367K Aug 14, 2024
Q1 2024 Reduced −27K −$4.4M −40.0% 40K May 15, 2024
Q4 2023 New +67K +$11M – 67K Feb 14, 2024
Q2 2023 Reduced −75K −$15M −71.7% 30K Aug 14, 2023
Q1 2023 Added +103K +$22M +7,145.6% 104K May 15, 2023
Q4 2022 Reduced −81K −$17M −98.3% 1K Feb 14, 2023
Q3 2022 First covered – – – 83K Nov 14, 2022
Q2 2022 Added +6K +$792K +265.0% 8K Aug 15, 2022
Q1 2022 Reduced −69K −$10M −97.0% 2K May 16, 2022
Q4 2021 Added +50K +$9.3M +238.9% 71K Feb 14, 2022
Q3 2021 Reduced −18K −$3.4M −46.4% 21K Nov 15, 2021
Q2 2021 Reduced −84K −$12M −68.4% 39K Aug 16, 2021
Q1 2021 First covered – – – 123K 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 ALNY?

Yes. As of Q1 2026, Ken Griffin disclosed 23K shares of ALNY, worth $7.7M. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

When did Ken Griffin buy ALNY?

Ken Griffin held ALNY 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 ALNY?

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

How many shares of ALNY does Ken Griffin own?

Ken Griffin disclosed 23K shares of ALNY 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 ALNY?

Ken Griffin began building the ALNY 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.