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Jeremy Grantham's Biogen Inc. (BIIB) position

Not anymore: Jeremy Grantham fully exited BIIB in Q4 2023. The position peaked at $39M in Q1 2023.
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Value at exit
$15M
Shares at exit
57K
Est. average buy price (i)
$214.85
est. since Q3 2022
Quarter-end price
$257.01

Estimated trade prices

Average price in quarters with purchases
$246.39
Average prices in quarters with sales
  • Q3 2023: $267.47 (43K shares sold)
  • Q2 2023: $297.84 (41K shares sold)
  • Q4 2022: $282.44 (6K shares sold)

BIIB price vs Grantham's position

1Y 3Y 5Y MAX
Dates
$100$200$40020222023202420252026Added 14K shares (18.2%) · Q3 2021. Average closing price $327.75 · Price range $282.99–$369.0514KsharespurchasedAdded 6K shares (6.1%) · Q4 2021. Average closing price $257.12 · Price range $223.92–$287.776KsharespurchasedAdded 28K shares (28.7%) · Q1 2022. Average closing price $217.46 · Price range $193.77–$244.1428KsharespurchasedAdded 14K shares (10.7%) · Q2 2022. Average closing price $204.43 · Price range $187.54–$223.0214KsharespurchasedSold 6K shares (4.0%) · Q4 2022. Average closing price $282.44 · Price range $253.67–$306.726KsharessoldAdded 5K shares (4.0%) · Q1 2023. Average closing price $276.70 · Price range $256.56–$292.345KsharespurchasedSold 41K shares (29.2%) · Q2 2023. Average closing price $297.84 · Price range $275.25–$318.0641KsharessoldSold 43K shares (42.9%) · Q3 2023. Average closing price $267.47 · Price range $253.30–$285.8943Ksharessold
Average closing price · filing quarter
$267.47
Price range · filing quarter
$253.30 – $285.89
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Every quarterly change

Quarter Action Shares change Est. value change Δ Own Shares held Filing date
Q4 2023 Exited −57K −$14M −100.0% 0 Feb 13, 2024
Q3 2023 Reduced −43K −$11M −42.9% 57K Nov 13, 2023
Q2 2023 Reduced −41K −$12M −29.2% 99K Aug 14, 2023
Q1 2023 Added +5K +$1.5M +4.0% 141K May 12, 2023
Q4 2022 Reduced −6K −$1.6M −4.0% 135K Feb 13, 2023
Q3 2022 First covered – – – 141K Nov 10, 2022
Q2 2022 Added +14K +$2.8M +10.7% 141K Aug 12, 2022
Q1 2022 Added +28K +$6.2M +28.7% 128K May 13, 2022
Q4 2021 Added +6K +$1.5M +6.1% 99K Feb 11, 2022
Q3 2021 Added +14K +$4.7M +18.2% 93K Nov 12, 2021
Q2 2021 First covered – – – 79K Aug 12, 2021
Q1 2021 First covered – – – 73K May 13, 2021
Data through Q4 2023 · filed Feb 13, 2024
12 grouped rows from 12 quarters

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Common questions

Does Jeremy Grantham own BIIB?

Not currently. Jeremy Grantham fully exited BIIB in Q4 2023, and the complete history is above. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

When did Jeremy Grantham buy BIIB?

Jeremy Grantham 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 Jeremy Grantham sell BIIB?

Yes. Jeremy Grantham reduced and then fully exited BIIB by Q4 2023; 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 Jeremy Grantham own?

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

What price did Jeremy Grantham pay for BIIB?

Jeremy Grantham began building the BIIB 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.