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Jim Simons's Amprius Technologies, Inc. (AMPX) position

Yes: as of Q1 2026, Jim Simons holds 360K shares of AMPX worth $6.1M (0.0% of the disclosed portfolio). Last quarter the position was increased by 218.7%. First disclosed Q3 2024.
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Current value
$6.1M
Shares held
360K
% of portfolio
0.0%
Est. average buy price (i)
$12.24
est. since Q1 2025
Quarter-end price
$16.86

Estimated trade prices

Average price in quarters with purchases
$4.80
Average prices in quarters with sales
  • Q3 2025: $7.87 (1.3M shares sold)

AMPX price vs Simons's position

1Y 3Y 5Y MAX
Dates
$0.7$20$40202420252026New position of 13K shares · Q3 2024. Average closing price $1.10 · Price range $0.71–$1.4413KsharespurchasedAdded 1.3M shares (over 1,000%) · Q2 2025. Average closing price $2.81 · Price range $2.07–$4.271.3MsharespurchasedSold 1.3M shares (99.1%) · Q3 2025. Average closing price $7.87 · Price range $3.91–$12.061.3MsharessoldAdded 100K shares (809.9%) · Q4 2025. Average closing price $11.43 · Price range $7.83–$14.61100KsharespurchasedAdded 247K shares (218.7%) · Q1 2026. Average closing price $13.04 · Price range $8.74–$19.38247Ksharespurchased
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 +247K +$3.2M +218.7% 360K May 14, 2026
Q4 2025 Added +100K +$1.1M +809.9% 113K Feb 12, 2026
Q3 2025 Reduced −1.3M −$10M −99.1% 12K Nov 13, 2025
Q2 2025 Added +1.3M +$3.7M +9,251.4% 1.3M Aug 13, 2025
Q1 2025 First covered – – – 14K May 14, 2025
Q4 2024 First covered – – – 765K Feb 13, 2025
Q3 2024 New +13K +$14K – 13K Nov 13, 2024
Data through Q1 2026 · filed May 14, 2026
7 grouped rows from 7 quarters

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Common questions

Does Jim Simons own AMPX?

Yes. As of Q1 2026, Jim Simons disclosed 360K shares of AMPX, worth $6.1M. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

When did Jim Simons buy AMPX?

Jim Simons first disclosed a AMPX position in Q3 2024; 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 Jim Simons sell AMPX?

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

How many shares of AMPX does Jim Simons own?

Jim Simons disclosed 360K shares of AMPX as of Q1 2026. All figures come from SEC 13F filings for Q1 2026, the latest disclosed quarter.

What price did Jim Simons pay for AMPX?

Jim Simons began building the AMPX 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.