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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

Open-market trades, last 90 days

Open-market purchases (P) and sales (S) by Amprius Technologies, Inc. insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.

Open-market buys
0 filings
Open-market sells
3 filings
3 insiders, $1.27M in total
Insiders trading
3
Net value
−$1.27M
Purchases minus sales

Insider roster

Directors, officers and 10% owners who have filed a Form 4 for Amprius Technologies, Inc., current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.

Insider roster for Amprius Technologies, Inc.
NameTitleLast reported holdingLast filingFilings, past year
Sun KangDirector1,218,397Aug 25, 202611
Stefan Constantin IonelChief Technology Officer771,629Aug 25, 20269
Stepien Thomas MChief Executive Officer37,260IndirectAug 25, 20266
Dixon Donald RDirector359,380IndirectJun 16, 20263
Bayless Kathleen ADirector216,120Jun 16, 20261
Chu StevenDirector137,762Jun 16, 20262
Satterthwaite LivingstonDirector346,506Jun 16, 20261
HSIEH Wen HsuanDirector44,444Mar 13, 20261
Rodriguez Ricardo C.Chief Financial Officer350,000Mar 13, 20262
Wallach SandraChief Financial Officer1,005,275Aug 25, 20250
Bornstein JonathanPresident of Amprius Lab422,668Mar 12, 20250
Amprius, Inc.10% Owner2,500,071Oct 25, 20240
Mirro Justin EDirector1,195,000IndirectSep 5, 20240
Gustanski MaryDirector146,396Jun 7, 20240
Kensington Capital Sponsor IV LLCOther: Former 10% holder (see ftn 2)0Sep 16, 20220

Insider trades

Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.

Insider trades
Filed (ET)Trade dateFiling delayInsiderTransactionSharesAvg priceValueHolding changeFlags
Feb 24, 2026 (view filing)Feb 231 dayStefan Constantin IonelChief Technology OfficerSSale−25.4K$10.16−$257.7K−3.4%723.3K after
Mar 12, 2026 (view filing)Mar 10-122 daysChu StevenDirectorSSale−322.2K$18.20−$5.86M−71.7%127.3K after4 lots
Mar 13, 2026 (view filing)Mar 121 dayHSIEH Wen HsuanDirectorSSale−413.1K$18.45−$7.62M−90.3%44.4K after2 lots
Mar 24, 2026 (view filing)Mar 231 daySun KangDirectorSSale−217.9K$18.80−$4.10M−79.4%56.4K after2 lots
Apr 2, 2026 (view filing)Apr 11 daySun KangDirectorSSale−1.50M$15.90−$23.9M−52.8%1.34M after2 lots
May 26, 2026 (view filing)May 215 daysSun KangDirectorSSale−67.8K$14.79−$1.00M−5.0%1.28M after
May 26, 2026 (view filing)May 215 daysStefan Constantin IonelChief Technology OfficerSSale−28.8K$14.79−$426.1K−3.5%804.5K after
May 26, 2026 (view filing)May 215 daysStepien Thomas MChief Executive OfficerSSale−60.7K$14.79−$897.8K−8.0%699.3K after
May 28, 2026 (view filing)May 262 daysDixon Donald RDirectorSSale−17.9K$17.90−$320.3K−3.6%484.4K after
May 28, 2026 (view filing)May 271 daySun KangDirectorSSale−356$17.19−$6.12K0.0%1.28M after
May 28, 2026 (view filing)May 271 dayStefan Constantin IonelChief Technology OfficerSSale−3.21K$17.19−$55.1K−0.4%801.3K after
May 28, 2026 (view filing)May 271 dayStepien Thomas MChief Executive OfficerSSale−4.38K$17.19−$75.2K−0.6%694.9K after
Jun 5, 2026 (view filing)Jun 41 dayStepien Thomas MChief Executive OfficerSSale−2.00K$20.97−$41.9K−0.3%625.6K after
Jun 11, 2026 (view filing)Jun 92 daysDixon Donald RDirectorSSale−40.0K$19.13−$765.2K−8.3%444.4K after
Jun 16, 2026 (view filing)Jun 151 dayDixon Donald RDirectorSSale−85.0K$17.17−$1.46M−19.1%359.4K after
Aug 25, 2026 (view filing)5:21 PM ETAug 21-244 daysStepien Thomas MChief Executive OfficerSSale−31.5K$10.26−$323.6K−5.0%594.1K after2 lots
Aug 25, 2026 (view filing)5:22 PM ETAug 214 daysStefan Constantin IonelChief Technology OfficerSSale−29.7K$10.34−$306.9K−3.7%771.6K after
Aug 25, 2026 (view filing)5:22 PM ETAug 214 daysSun KangDirectorSSale−62.1K$10.34−$642.2K−4.8%1.22M after