Constantin Ionel Stefan sold $307K of Amprius Technologies (AMPX)

Executed Aug 21, disclosed Aug 25, 4 days later.

Value, as filed

$307K

29,681 sh × $10.34

Executed

Aug 21

the trade date, as filed

Disclosed

Aug 25

4 days after the trade

Return, 21 sessionsiFrom the disclosed entry session; derived

–

purchases only

Returns are measured on stock purchases only.

The filer

Constantin Ionel Stefan Chief Technology Officer profile →

Constantin Ionel Stefan (Chief Technology Officer) filed 7 Form 4 reports in the trailing twelve months (0 purchases, 7 sales), most often in Amprius Technologies, Inc. (AMPX). The largest single filing was $6.8M of AMPX (566,107 sh across 2 lots, as filed), executed Jan 21.

The name

AMPX

Amprius Technologies, Inc. AMPX · Industrials · 29 filings in 24 months ticker →

Industrials · Amprius Technologies, Inc. develops, manufactures, and markets lithium-ion batteries for mobility applications

More Industrials filings→ Insider filings, newest first→ View the original filing at www.sec.gov→

Other filings by Constantin Ionel Stefan in AMPX

AMPXSALE Amprius Technologies, Inc. $426K
28,812 sh × $14.79
Exec May 21
Filed May 26 · 5:30 PM ET AMPXSALE Amprius Technologies, Inc. $258K
25,366 sh × $10.16
Exec Feb 23
Filed Feb 24 · 5:30 PM ET AMPXSALE Amprius Technologies, Inc. $476K
39,690 sh × $12.00
Exec Jan 28
Filed Jan 30 · 5:30 PM ET AMPXSALE Amprius Technologies, Inc. $6.8M
566,107 sh across 2 lots
Exec Jan 21
Filed Jan 23 · 5:30 PM ET AMPXSALE Amprius Technologies, Inc. $2.1M
198,255 sh × $10.51
Exec Dec 11 2025
Filed Dec 15 2025 · 5:30 PM ET AMPXSALE Amprius Technologies, Inc. $252K
25,024 sh × $10.08
Exec Nov 21 2025
Filed Nov 25 2025 · 5:30 PM ET AMPXSALE Amprius Technologies, Inc. $131K
19,159 sh × $6.82
Exec Aug 21 2025
Filed Aug 25 2025 · 5:30 PM ET