Amprius Technologies, Inc.
AMPX- Exchange
- NYSE
- Industry
- Miscellaneous Electrical Machinery, Equipment & Supplies
- SEC CIK
- 0001899287
In the last 90 days, Amprius Technologies, Inc. insiders filed 0 open-market purchases and 3 sales; 261 institutions reported holding it in 13F filings for Q2 2026, worth $1.35B in total; no superinvestor holds it.
Other share classesAMPX.WT
Holders of 5% or more of AMPX
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Amprius Technologies, Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| BlackRock, Inc. | 13G/A | 7.40%10.7M shares | +1.60 ppfrom 5.80% | Oct 17, 20252 filings | Jul 27, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
22 Schedule 13D and 13G filings on Amprius Technologies, Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Aug 10, 20264:13 PM ET | Jane Street Group, LLCand 2 others | 13G/A | 3.30%4.71M shares | −1.80 ppfrom 5.10%Below 5% | Jun 30, 2026 | SEC |
| Jul 27, 20264:25 PM ET | BlackRock, Inc. | 13G/A | 7.40%10.7M shares | +1.60 ppfrom 5.80% | Jun 30, 2026 | SEC |
| Apr 28, 20264:07 PM ET | Jane Street Group, LLCand 2 others | 13G | 5.10%7.01M shares | New | Apr 22, 2026 | SEC |
| Mar 26, 20263:42 PM ET | Vanguard Group Inc | 13G/A | 0.00%0 shares | −5.20 ppfrom 5.20%Below 5% | Mar 13, 2026 | SEC |
| Oct 30, 20252:04 PM ET | Vanguard Group Inc | 13G | 5.20%6.51M shares | New | Sep 30, 2025 | SEC |
| Oct 17, 20256:05 PM ET | BlackRock, Inc. | 13G | 5.80%7.30M shares | New | Sep 30, 2025 | SEC |
| Aug 14, 20255:01 PM ET | SAIF Partners IV L.P.and 3 others | 13G/A | 0.00%0 shares | −6.30 ppfrom 6.30%Below 5% | Jun 30, 2025 | SEC |
| Aug 6, 20255:59 PM ET | Salzman Alan E | 13G/A | 2.60%3.11M shares | –Below 5% | Aug 6, 2025 | SEC |
| May 15, 20255:33 PM ET | SAIF Partners IV L.P.and 3 others | 13G/A | 6.30%7.61M shares | – | Mar 31, 2025 | SEC |
| Oct 28, 2024 | Dixon Donald R | 13DOld format | – | New | – | SEC |
| Oct 28, 2024 | SAIF Partners IV L.P. | 13GOld format | – | New | – | SEC |
| Oct 25, 2024 | Amprius, Inc. | 13D/AOld format | – | – | – | SEC |
| Oct 25, 2024 | Salzman Alan E | 13GOld format | – | New | – | SEC |
| Oct 25, 2024 | Sun Kang | 13DOld format | – | New | – | SEC |
| May 12, 2023 | Amprius, Inc. | 13D/AOld format | – | – | – | SEC |
| Oct 7, 2022 | Wealthspring Capital LLC | 13G/AOld format | – | – | – | SEC |
| Sep 23, 2022 | Kensington Capital Sponsor IV LLC | 13D/AOld format | – | – | – | SEC |
| Sep 19, 2022 | Amprius, Inc. | 13DOld format | – | New | – | SEC |
| Jun 1, 2022 | Wealthspring Capital LLC | 13GOld format | – | New | – | SEC |
| May 13, 2022 | Kensington Capital Partners, LLC | 13D/AOld format | – | – | – | SEC |
| Mar 18, 2022 | Kensington Capital Partners, LLC | 13DOld format | – | New | – | SEC |
| Mar 11, 2022 | Dryden Capital, LLC | 13GOld format | – | New | – | SEC |
Form 144: proposed insider sales
35 notices from officers, directors and other affiliates planning to sell Amprius Technologies, Inc. shares, newest first.
| Filed (ET) | Seller | Shares to sell | Market value | Planned sale | Broker | Filing |
|---|---|---|---|---|---|---|
| Nov 21, 20248:58 PM ET | Jonathan BornsteinOfficer | 18.2K | $36.0K | Nov 21, 2024 | Morgan Stanley Smith Barney LLC | SEC |
| Nov 21, 20248:24 PM ET | Constantin Ionel StefanOfficer | 8.57K | $17.0K | Nov 21, 2024 | Morgan Stanley Smith Barney LLC | SEC |
| Nov 21, 20248:16 PM ET | Kang SunOfficer · Director | 33.8K | $66.9K | Nov 21, 2024 | Morgan Stanley Smith Barney LLC | SEC |
| Nov 21, 20248:15 PM ET | Sandra WallachOfficer | 17.2K | $34.0K | Nov 21, 2024 | Morgan Stanley Smith Barney LLC | SEC |
| Nov 21, 20245:11 PM ET | Jonathan G Bornstein Phyllis Brock TrustOfficer | 15.0K | $29.4K | Nov 21, 2024 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Nov 20, 20244:31 PM ET | Jonathan G Bornstein Phyllis Brock TrustOfficer | 133.5K | $256.9K | Nov 20, 2024 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Nov 12, 20248:36 AM ET | Amprius, Inc.10% stockholder · Parent Company-Private Inc. | 379.2K | $857.6K | Nov 11, 2024 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Nov 8, 20244:42 PM ET | Amprius, Inc.10% stockholder · Parent Company-Private Inc. | 600.0K | $969.1K | Nov 8, 2024 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Nov 7, 20245:04 PM ET | Amprius, Inc.10% stockholder · Parent Company-Private Inc. | 40.4K | $53.2K | Nov 7, 2024 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Oct 25, 20245:48 PM ET | Mirro Justin EFormer director | 3.27M | $4.74M | Oct 24, 2024 | Cantor Fitzgerald | SEC |
| Sep 4, 20249:52 PM ET | Justin MirroDirector | 1.00M | $986.0K | Sep 3, 2024 | Cantor Fitzgerald | SEC |
| Sep 3, 20245:17 PM ET | Amprius, Inc10% stockholder | 1.50M | $1.67M | Sep 3, 2024 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Aug 22, 20244:53 PM ET | Constantin Ionel StefanOfficer | 8.80K | $9.12K | Aug 21, 2024 | Morgan Stanley Smith Barney LLC | SEC |
| Aug 22, 20244:52 PM ET | Sandra WallachOfficer | 17.6K | $18.2K | Aug 21, 2024 | Morgan Stanley Smith Barney LLC | SEC |
| Aug 22, 20244:51 PM ET | Kang SunOfficer | 33.3K | $34.5K | Aug 21, 2024 | Morgan Stanley Smith Barney LLC | SEC |
| Aug 22, 20244:49 PM ET | Jonathan BornsteinOfficer | 18.6K | $19.3K | Aug 21, 2024 | Morgan Stanley Smith Barney LLC | SEC |
| Jun 12, 20248:38 PM ET | Mirro Justin EDirector | 800.0K | $1.06M | Jun 12, 2024 | Cantor Fitzgerald | SEC |
| May 28, 20248:28 AM ET | Sandra WallachOfficer | 18.8K | $25.2K | May 21, 2024 | Morgan Stanley Smith Barney LLC | SEC |
| May 28, 20248:25 AM ET | Jonathan BornsteinOfficer | 19.9K | $26.7K | May 21, 2024 | Morgan Stanley Smith Barney LLC | SEC |
| May 28, 20248:22 AM ET | Kang SunOfficer | 35.6K | $47.7K | May 21, 2024 | Morgan Stanley Smith Barney LLC | SEC |
| May 28, 20248:13 AM ET | Constantin Ionel StefanOfficer | 9.40K | $12.6K | May 21, 2024 | Morgan Stanley Smith Barney LLC | SEC |
| Apr 2, 20244:22 PM ET | Jonathan BornsteinOfficer | 126.0K | $326.3K | Apr 2, 202410b5-1 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Mar 5, 20244:30 PM ET | Jonathan BornsteinOfficer | 150.0K | $439.5K | Mar 5, 202410b5-1 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Feb 6, 20244:13 PM ET | Jonathan BornsteinOfficer | 150.0K | $607.5K | Feb 6, 202410b5-1 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
| Jan 2, 20244:39 PM ET | Jonathan BornsteinOfficer | 150.0K | $793.5K | Jan 2, 202410b5-1 | Morgan Stanley Smith Barney LLC Executive Financial Services | SEC |
Showing the latest 25. See the AMPX notices from the last 12 months