Amprius Technologies, Inc. (AMPX)
NYSE: AMPX · Miscellaneous Electrical Machinery, Equipment & Supplies · Fremont, CA · filing with the SEC since 2021
Who owns Amprius Technologies, Inc.
As filed with the SECHolders of 5% or more
1
Blackrock, Inc. holds 7.4% of Common Stock, as its SCHEDULE 13G/A filed Jul 27, 2026 says.
Directors and officers
10
report now, of 23 people on the record since 2022. Their holdings as a group are not read here.
Institutions as a whole
n/a
The record does not read the share held by managers that file Form 13F, so none is printed and no split of the rest is estimated. What it holds is the 1 named at left.
Holders of 5% or moreshare of the class, as filed
Blackrock, Inc.
SCHEDULE 13G/A · filed Jul 27, 2026 · Common Stock · 5.8% in Oct 17, 2025
Jane Street Group, LLC
SCHEDULE 13G/A · filed Aug 10, 2026 · Common stock, $0.0001 par value · reported falling below 5%, from 5.1% in Apr 28, 2026
Salzman Alan E
SCHEDULE 13G/A · filed Aug 6, 2025 · Common Stock, $0.0001 par value · reported falling below 5%
The Vanguard Group
SCHEDULE 13G/A · filed Mar 26, 2026 · Common Stock · reported falling below 5%, from 5.2% in Oct 30, 2025
SAIF Partners IV L.P.
SCHEDULE 13G/A · filed Aug 14, 2025 · Common Stock, $0.0001 par value per share · reported falling below 5%, from 6.3% in May 15, 2025
What AMPX reports owning in othersstakes of 5% or more, and other ties
1 subsidiary in 1 country, from the list filed with the 10-K filed Mar 6, 2026.
Insider tradesForm 4
37sales
0purchases
0sales on a scheduled plan
6people selling
$85.7Msold, in dollars
$0bought, in dollars
Open-market trades on Form 4 from Sep 30, 2025 to Sep 30, 2026. A scheduled plan is a selling program set in advance under SEC rule 10b5-1. The trades are listed as filed and do not feed the grade.
By calendar yearSoldBought
2026 runs to Sep 30, 2026. Dollars as filed, summed by the transaction date.
People who traded in the window6 of 25 on the roster
| Person | Role as filed | Sales | Sold | On a plan | Buys | Bought |
|---|---|---|---|---|---|---|
| Sun Kang | Chief Executive Officer | 13 | $57.6M | 0 | 0 | $0 |
| Stefan Constantin Ionel | Chief Technology Officer | 10 | $10.7M | 0 | 0 | $0 |
| Hsieh Wen Hsuan | director | 2 | $7.6M | 0 | 0 | $0 |
| Chu Steven | director | 4 | $5.9M | 0 | 0 | $0 |
| Dixon Donald R | director | 3 | $2.5M | 0 | 0 | $0 |
| Stepien Thomas M | Chief Executive Officer | 5 | $1.3M | 0 | 0 | $0 |