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Ray Dalio's Biogen Inc. (BIIB) position

Not anymore: Ray Dalio fully exited BIIB in Q4 2025. The position peaked at $55M in Q2 2022.
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Value at exit
$5.6M
Shares at exit
40K
Est. average buy price (i)
$135.22
Quarter-end price
$140.08

Estimated trade prices

Average price in quarters with purchases
$209.36
Average prices in quarters with sales
  • Q4 2024: $168.67 (2K shares sold)
  • Q2 2024: $217.32 (29K shares sold)
  • Q1 2024: $234.20 (98K shares sold)
  • Q4 2023: $245.62 (8K shares sold)
  • Q2 2023: $297.84 (21K shares sold)
  • Q4 2022: $282.44 (3K shares sold)
  • Q4 2021: $257.12 (218 shares sold)
  • Q3 2021: $327.75 (5K shares sold)

BIIB price vs Dalio's position

1Y 3Y 5Y MAX
Dates
$100$200$40020222023202420252026Sold 5K shares (29.3%) · Q3 2021. Average closing price $327.75 · Price range $282.99–$369.055KsharessoldSold 218 shares (1.7%) · Q4 2021. Average closing price $257.12 · Price range $223.92–$287.77218sharessoldAdded 25K shares (202.5%) · Q1 2022. Average closing price $217.46 · Price range $193.77–$244.1425KsharespurchasedAdded 230K shares (614.1%) · Q2 2022. Average closing price $204.43 · Price range $187.54–$223.02230KsharespurchasedSold 3K shares (2.5%) · Q4 2022. Average closing price $282.44 · Price range $253.67–$306.723KsharessoldAdded 37K shares (33.3%) · Q1 2023. Average closing price $276.70 · Price range $256.56–$292.3437KsharespurchasedSold 21K shares (14.4%) · Q2 2023. Average closing price $297.84 · Price range $275.25–$318.0621KsharessoldAdded 24K shares (19.3%) · Q3 2023. Average closing price $267.47 · Price range $253.30–$285.8924KsharespurchasedSold 8K shares (5.0%) · Q4 2023. Average closing price $245.62 · Price range $222.59–$267.948KsharessoldSold 98K shares (68.6%) · Q1 2024. Average closing price $234.20 · Price range $212.02–$267.7198KsharessoldSold 29K shares (63.5%) · Q2 2024. Average closing price $217.32 · Price range $190.52–$236.7229KsharessoldAdded 56K shares (339.2%) · Q3 2024. Average closing price $209.21 · Price range $189.07–$236.8056KsharespurchasedSold 2K shares (2.9%) · Q4 2024. Average closing price $168.67 · Price range $146.47–$191.562KsharessoldNew position of 40K shares · Q3 2025. Average closing price $135.22 · Price range $122.68–$148.8440Ksharespurchased
Average closing price · filing quarter
$135.22
Price range · filing quarter
$122.68 – $148.84
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Every quarterly change

Quarter Action Shares change Est. value change Δ Own Shares held Filing date
Q4 2025 Exited −40K −$6.5M −100.0% 0 Feb 13, 2026
Q3 2025 New +40K +$5.4M – 40K Nov 13, 2025
Q4 2024 Reduced −2K −$349K −2.9% 70K Feb 13, 2025
Q3 2024 Added +56K +$12M +339.2% 72K Nov 13, 2024
Q2 2024 Reduced −29K −$6.2M −63.5% 16K Aug 14, 2024
Q1 2024 Reduced −98K −$23M −68.6% 45K May 14, 2024
Q4 2023 Reduced −8K −$1.9M −5.0% 143K Feb 14, 2024
Q3 2023 Added +24K +$6.5M +19.3% 151K Nov 13, 2023
Q2 2023 Reduced −21K −$6.3M −14.4% 126K Aug 11, 2023
Q1 2023 Added +37K +$10M +33.3% 148K May 12, 2023
Q4 2022 Reduced −3K −$798K −2.5% 111K Feb 13, 2023
Q3 2022 First covered – – – 114K Nov 10, 2022
Q2 2022 Added +230K +$47M +614.1% 268K Aug 11, 2022
Q1 2022 Added +25K +$5.5M +202.5% 38K May 13, 2022
Q4 2021 Reduced −218 −$56K −1.7% 12K Feb 14, 2022
Q3 2021 Reduced −5K −$1.7M −29.3% 13K Nov 12, 2021
Q2 2021 First covered – – – 18K Aug 13, 2021
Q1 2021 First covered – – – 8K May 14, 2021
Data through Q4 2025 · filed Feb 13, 2026
18 grouped rows from 18 quarters

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Common questions

Does Ray Dalio own BIIB?

Not currently. Ray Dalio fully exited BIIB in Q4 2025, and the complete history is above. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

When did Ray Dalio buy BIIB?

Ray Dalio held BIIB 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 Ray Dalio sell BIIB?

Yes. Ray Dalio reduced and then fully exited BIIB by Q4 2025; 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 BIIB does Ray Dalio own?

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

What price did Ray Dalio pay for BIIB?

Ray Dalio's estimated average buy price for BIIB is $135.22, 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.