Save your place

Sign in to WhoBought

Please try again later.

Ken Griffin's Ionis Pharmaceuticals, Inc. (IONS) position

Yes: as of Q1 2026, Ken Griffin holds 943K shares of IONS worth $71M (0.1% of the disclosed portfolio). Held since at least Q1 2021; that opening coverage snapshot is not counted as a purchase.
View full portfolio →
Current value
$71M
Shares held
943K
% of portfolio
0.1%
Est. average buy price (i)
$48.82
est. since Q3 2025
Quarter-end price
$75.09

Estimated trade prices

Average price in quarters with purchases
$36.66
Average prices in quarters with sales
  • Q1 2026: $78.92 (1.2M shares sold)
  • Q4 2025: $75.30 (267K shares sold)
  • Q2 2025: $32.73 (2.0M shares sold)
  • Q3 2024: $46.53 (226K shares sold)
  • Q1 2024: $47.67 (174K shares sold)
  • Q4 2023: $47.90 (283K shares sold)
  • Q3 2023: $41.26 (186K shares sold)
  • Q1 2023: $37.55 (244K shares sold)
  • Q4 2022: $42.06 (23K shares sold)
  • Q3 2022: $42.14 (62K shares sold)
  • Q2 2022: $37.71 (764K shares sold)

IONS price vs Griffin's position

1Y 3Y 5Y MAX
Dates
$20$50$10020222023202420252026Added 504K shares (92.5%) · Q3 2021. Average closing price $37.68 · Price range $33.54–$40.55504KsharespurchasedAdded 172K shares (16.4%) · Q4 2021. Average closing price $31.48 · Price range $25.61–$35.10172KsharespurchasedAdded 23K shares (1.9%) · Q1 2022. Average closing price $32.73 · Price range $29.88–$37.0423KsharespurchasedSold 764K shares (61.4%) · Q2 2022. Average closing price $37.71 · Price range $31.71–$43.00764KsharessoldSold 62K shares (12.9%) · Q3 2022. Average closing price $42.14 · Price range $36.54–$48.6662KsharessoldSold 23K shares (5.4%) · Q4 2022. Average closing price $42.06 · Price range $37.12–$46.5223KsharessoldSold 244K shares (61.7%) · Q1 2023. Average closing price $37.55 · Price range $33.58–$41.20244KsharessoldAdded 570K shares (376.3%) · Q2 2023. Average closing price $38.43 · Price range $34.73–$43.33570KsharespurchasedSold 186K shares (25.8%) · Q3 2023. Average closing price $41.26 · Price range $38.50–$47.13186KsharessoldSold 283K shares (52.9%) · Q4 2023. Average closing price $47.90 · Price range $43.39–$51.63283KsharessoldSold 174K shares (69.1%) · Q1 2024. Average closing price $47.67 · Price range $42.03–$53.55174KsharessoldAdded 549K shares (703.6%) · Q2 2024. Average closing price $41.01 · Price range $36.45–$47.70549KsharespurchasedSold 226K shares (36.0%) · Q3 2024. Average closing price $46.53 · Price range $40.06–$51.86226KsharessoldAdded 1.8M shares (439.9%) · Q4 2024. Average closing price $37.38 · Price range $33.73–$40.361.8MsharespurchasedAdded 1.3M shares (60.7%) · Q1 2025. Average closing price $32.75 · Price range $30.17–$34.971.3MsharespurchasedSold 2.0M shares (57.0%) · Q2 2025. Average closing price $32.73 · Price range $25.51–$40.002.0MsharessoldSold 267K shares (11.1%) · Q4 2025. Average closing price $75.30 · Price range $65.80–$82.73267KsharessoldSold 1.2M shares (55.8%) · Q1 2026. Average closing price $78.92 · Price range $69.68–$86.501.2Msharessold← Earlier —1 purchase
Average closing price · filing quarter
$78.92
Price range · filing quarter
$69.68 – $86.50
Sign in to see who bought

Every quarterly change

Quarter Action Shares change Est. value change Δ Own Shares held Filing date
Q1 2026 Reduced −1.2M −$94M −55.8% 943K May 15, 2026
Q4 2025 Reduced −267K −$20M −11.1% 2.1M Feb 17, 2026
Q3 2025 First covered – – – 2.4M Nov 14, 2025
Q2 2025 Reduced −2.0M −$65M −57.0% 1.5M Aug 14, 2025
Q1 2025 Added +1.3M +$43M +60.7% 3.5M May 15, 2025
Q4 2024 Added +1.8M +$66M +439.9% 2.2M Feb 14, 2025
Q3 2024 Reduced −226K −$11M −36.0% 401K Nov 14, 2024
Q2 2024 Added +549K +$23M +703.6% 627K Aug 14, 2024
Q1 2024 Reduced −174K −$8.3M −69.1% 78K May 15, 2024
Q4 2023 Reduced −283K −$14M −52.9% 253K Feb 14, 2024
Q3 2023 Reduced −186K −$7.7M −25.8% 536K Nov 14, 2023
Q2 2023 Added +570K +$22M +376.3% 722K Aug 14, 2023
Q1 2023 Reduced −244K −$9.2M −61.7% 152K May 15, 2023
Q4 2022 Reduced −23K −$954K −5.4% 396K Feb 14, 2023
Q3 2022 Reduced −62K −$2.6M −12.9% 418K Nov 14, 2022
Q2 2022 Reduced −764K −$29M −61.4% 480K Aug 15, 2022
Q1 2022 Added +23K +$751K +1.9% 1.2M May 16, 2022
Q4 2021 Added +172K +$5.4M +16.4% 1.2M Feb 14, 2022
Q3 2021 Added +504K +$19M +92.5% 1.0M Nov 15, 2021
Q2 2021 Added +376K +$15M +221.2% 545K Aug 16, 2021
Q1 2021 First covered – – – 170K May 21, 2021
Data through Q1 2026 · filed May 15, 2026
21 grouped rows from 21 quarters

More Griffin positions

NVIDIA Corporation(NVDA)
$3.2B
2.3% of portfolio

Amazon.com, Inc.(AMZN)
$1.7B
1.2% of portfolio

Micron Technology, Inc.(MU)
$1.6B
1.1% of portfolio

Taiwan Semiconductor Manufacturing Company Limited(TSM)
$1.4B
1.0% of portfolio

Apple Inc.(AAPL)
$1.3B
0.9% of portfolio

Meta Platforms, Inc.(META)
$1.0B
0.7% of portfolio

Common questions

Does Ken Griffin own IONS?

Yes. As of Q1 2026, Ken Griffin disclosed 943K shares of IONS, worth $71M. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

When did Ken Griffin buy IONS?

Ken Griffin held IONS 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 IONS?

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

How many shares of IONS does Ken Griffin own?

Ken Griffin disclosed 943K shares of IONS 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 IONS?

Ken Griffin began building the IONS 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.