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Ken Griffin's Amprius Technologies, Inc. (AMPX) position

Yes: as of Q1 2026, Ken Griffin holds 1.4M shares of AMPX worth $24M (0.0% of the disclosed portfolio). Last quarter the position was increased by 216.3%. First disclosed Q3 2022.
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Current value
$24M
Shares held
1.4M
% of portfolio
0.0%
Est. average buy price (i)
$11.22
Quarter-end price
$16.86

Estimated trade prices

Average price in quarters with purchases
$8.74
Average prices in quarters with sales
  • Q4 2025: $11.43 (2.1M shares sold)

AMPX price vs Griffin's position

1Y 3Y 5Y MAX
Dates
$5$10$15$20$252026Added 2.2M shares (796.4%) · Q3 2025. Average closing price $7.87 · Price range $3.91–$12.062.2MsharespurchasedSold 2.1M shares (81.9%) · Q4 2025. Average closing price $11.43 · Price range $7.83–$14.612.1MsharessoldAdded 984K shares (216.3%) · Q1 2026. Average closing price $13.04 · Price range $8.74–$19.38984Ksharespurchased← Earlier —4 purchases
Average closing price · filing quarter
$13.04
Price range · filing quarter
$8.74 – $19.38
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Every quarterly change

Quarter Action Shares change Est. value change Δ Own Shares held Filing date
Q1 2026 Added +984K +$13M +216.3% 1.4M May 15, 2026
Q4 2025 Reduced −2.1M −$23M −81.9% 455K Feb 17, 2026
Q3 2025 Added +2.2M +$18M +796.4% 2.5M Nov 14, 2025
Q2 2025 Added +250K +$704K +851.0% 280K Aug 14, 2025
Q1 2025 New +29K +$87K – 29K May 15, 2025
Q2 2024 First covered – – – 105K Aug 14, 2024
Q1 2024 New +129K +$478K – 129K May 15, 2024
Q3 2022 New +13K +$132K – 13K Nov 14, 2022
Data through Q1 2026 · filed May 15, 2026
8 grouped rows from 8 quarters

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Common questions

Does Ken Griffin own AMPX?

Yes. As of Q1 2026, Ken Griffin disclosed 1.4M shares of AMPX, worth $24M. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

When did Ken Griffin buy AMPX?

Ken Griffin first disclosed a AMPX position in Q3 2022; every quarterly buy and sell since is in the table above. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

Did Ken Griffin sell AMPX?

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

How many shares of AMPX does Ken Griffin own?

Ken Griffin disclosed 1.4M shares of AMPX 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 AMPX?

Ken Griffin's estimated average buy price for AMPX is $11.22, 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.