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Ken Griffin's Penumbra, Inc. (PEN) position

Yes: as of Q1 2026, Ken Griffin holds 203K shares of PEN worth $67M (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
$67M
Shares held
203K
% of portfolio
0.0%
Est. average buy price (i)
$244.11
est. since Q1 2021
Quarter-end price
$328.37

Estimated trade prices

Average price in quarters with purchases
$234.45
Average prices in quarters with sales
  • Q1 2026: $338.61 (788K shares sold)
  • Q2 2025: $272.19 (565K shares sold)
  • Q1 2024: $247.22 (49K shares sold)
  • Q4 2023: $221.05 (157K shares sold)
  • Q3 2023: $277.67 (67K shares sold)
  • Q4 2022: $195.51 (227K shares sold)
  • Q2 2022: $158.67 (41K shares sold)
  • Q4 2021: $264.38 (101K shares sold)
  • Q3 2021: $268.79 (33K shares sold)

PEN price vs Griffin's position

1Y 3Y 5Y MAX
Dates
$100$200$40020222023202420252026Sold 33K shares (6.7%) · Q3 2021. Average closing price $268.79 · Price range $250.72–$291.2433KsharessoldSold 101K shares (22.4%) · Q4 2021. Average closing price $264.38 · Price range $238.08–$288.00101KsharessoldAdded 17K shares (4.7%) · Q1 2022. Average closing price $222.19 · Price range $187.51–$283.9817KsharespurchasedSold 41K shares (11.0%) · Q2 2022. Average closing price $158.67 · Price range $116.09–$227.3341KsharessoldAdded 106K shares (32.4%) · Q3 2022. Average closing price $160.46 · Price range $120.36–$205.88106KsharespurchasedSold 227K shares (52.5%) · Q4 2022. Average closing price $195.51 · Price range $151.88–$228.27227KsharessoldAdded 95K shares (46.3%) · Q1 2023. Average closing price $255.26 · Price range $220.77–$278.6995KsharespurchasedAdded 15K shares (5.1%) · Q2 2023. Average closing price $307.06 · Price range $271.54–$344.0615KsharespurchasedSold 67K shares (21.4%) · Q3 2023. Average closing price $277.67 · Price range $240.69–$338.7767KsharessoldSold 157K shares (63.2%) · Q4 2023. Average closing price $221.05 · Price range $181.44–$260.22157KsharessoldSold 49K shares (53.3%) · Q1 2024. Average closing price $247.22 · Price range $220.09–$273.1549KsharessoldAdded 26K shares (61.6%) · Q2 2024. Average closing price $199.64 · Price range $172.27–$223.9526KsharespurchasedAdded 343K shares (497.0%) · Q3 2024. Average closing price $188.96 · Price range $163.64–$210.12343KsharespurchasedAdded 322K shares (78.2%) · Q4 2024. Average closing price $227.37 · Price range $190.81–$253.66322KsharespurchasedAdded 50K shares (6.8%) · Q1 2025. Average closing price $270.50 · Price range $237.28–$303.7650KsharespurchasedSold 565K shares (72.1%) · Q2 2025. Average closing price $272.19 · Price range $253.22–$299.78565KsharessoldAdded 752K shares (343.4%) · Q3 2025. Average closing price $252.23 · Price range $227.15–$287.09752KsharespurchasedAdded 19K shares (2.0%) · Q4 2025. Average closing price $276.19 · Price range $225.54–$320.8519KsharespurchasedSold 788K shares (79.5%) · Q1 2026. Average closing price $338.61 · Price range $300.97–$359.40788Ksharessold← Earlier —1 purchase
Average closing price · filing quarter
$338.61
Price range · filing quarter
$300.97 – $359.40
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Every quarterly change

Quarter Action Shares change Est. value change Δ Own Shares held Filing date
Q1 2026 Reduced −788K −$267M −79.5% 203K May 15, 2026
Q4 2025 Added +19K +$5.3M +2.0% 990K Feb 17, 2026
Q3 2025 Added +752K +$190M +343.4% 971K Nov 14, 2025
Q2 2025 Reduced −565K −$154M −72.1% 219K Aug 14, 2025
Q1 2025 Added +50K +$14M +6.8% 784K May 15, 2025
Q4 2024 Added +322K +$73M +78.2% 734K Feb 14, 2025
Q3 2024 Added +343K +$65M +497.0% 412K Nov 14, 2024
Q2 2024 Added +26K +$5.3M +61.6% 69K Aug 14, 2024
Q1 2024 Reduced −49K −$12M −53.3% 43K May 15, 2024
Q4 2023 Reduced −157K −$35M −63.2% 91K Feb 14, 2024
Q3 2023 Reduced −67K −$19M −21.4% 249K Nov 14, 2023
Q2 2023 Added +15K +$4.7M +5.1% 316K Aug 14, 2023
Q1 2023 Added +95K +$24M +46.3% 301K May 15, 2023
Q4 2022 Reduced −227K −$44M −52.5% 206K Feb 14, 2023
Q3 2022 Added +106K +$17M +32.4% 433K Nov 14, 2022
Q2 2022 Reduced −41K −$6.4M −11.0% 327K Aug 15, 2022
Q1 2022 Added +17K +$3.7M +4.7% 367K May 16, 2022
Q4 2021 Reduced −101K −$27M −22.4% 351K Feb 14, 2022
Q3 2021 Reduced −33K −$8.8M −6.7% 452K Nov 15, 2021
Q2 2021 Added +202K +$55M +71.7% 484K Aug 16, 2021
Q1 2021 First covered – – – 282K May 21, 2021
Data through Q1 2026 · filed May 15, 2026
21 grouped rows from 21 quarters

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Common questions

Does Ken Griffin own PEN?

Yes. As of Q1 2026, Ken Griffin disclosed 203K shares of PEN, worth $67M. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

When did Ken Griffin buy PEN?

Ken Griffin held PEN 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 PEN?

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

How many shares of PEN does Ken Griffin own?

Ken Griffin disclosed 203K shares of PEN 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 PEN?

Ken Griffin began building the PEN 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.