Constantin Ionel Stefan

Chief Technology Officer

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.

Add to watchlist

Return, ttmiAverage return per filing, trailing twelve months

–

no purchases on file

Delay-adjustediThe same average, entered at disclosure dates

–

returns measure stock purchases only

Filings, ttm

0 buys · 7 sells

Median delay

–

execution → disclosure

Volume, ttmiDollar value disclosed in the trailing twelve months

$10.6M

shares × price, as filed

Last traded

Aug 21

Filed Aug 25

Median ADV $72.5M across their filed names

Open performance→

Volume by month

Buys $0 Sells $10.7M

Shares × price, as filed · by filing month · past 24 months

Sectors filed on

Industrials 7 filings

Sector per market data · by filing · past 12 months

Most traded names

AMPX

Amprius Technologies, Inc. AMPX · 0 buys · 8 sells 8 filings

Recent filings

AMPXSALE Amprius Technologies, Inc. View filing → $307K
29,681 sh × $10.34
Exec Aug 21
Filed Aug 25 · 5:22 PM ET AMPXSALE Amprius Technologies, Inc. View filing → $426K
28,812 sh × $14.79
Exec May 21
Filed May 26 · 5:30 PM ET AMPXSALE Amprius Technologies, Inc. View filing → $258K
25,366 sh × $10.16
Exec Feb 23
Filed Feb 24 · 5:30 PM ET AMPXSALE Amprius Technologies, Inc. View filing → $476K
39,690 sh × $12.00
Exec Jan 28
Filed Jan 30 · 5:30 PM ET AMPXSALE Amprius Technologies, Inc. View filing → $6.8M
566,107 sh across 2 lots
Exec Jan 21
Filed Jan 23 · 5:30 PM ET AMPXSALE Amprius Technologies, Inc. View filing → $2.1M
198,255 sh × $10.51
Exec Dec 11 2025
Filed Dec 15 2025 · 5:30 PM ET AMPXSALE Amprius Technologies, Inc. View filing → $252K
25,024 sh × $10.08
Exec Nov 21 2025
Filed Nov 25 2025 · 5:30 PM ET AMPXSALE Amprius Technologies, Inc. View filing → $131K
19,159 sh × $6.82
Exec Aug 21 2025
Filed Aug 25 2025 · 5:30 PM ET