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AMPXAmprius Technologies, Inc.

Constantin Stefan

Chief Technology Officer at Amprius Technologies, Inc., as of Aug 25, 2026Sold $10.7M of stock in the past 12 months: 88% under a disclosed plan and 12% to cover taxes.

Updated Oct 15, 2026 from SEC filings · covers Oct 16, 2025 to Oct 15, 2026
79%†
share of stake sold at Amprius Technologies, Inc.
† Measured against shares held at the start plus shares received, because most of the shares sold arrived during the period.
246K
shares held after the latest filing, Amprius Technologies, Inc.
Vested shares reported on Forms 3, 4 and 5 only. Not the insider's whole wealth.
1
company filed for

Selling by month

Oct 2025 to Oct 2026. Each sale is counted once: under a disclosed plan, else to cover taxes, else no plan disclosed.

Disclosed planTo cover taxesOne dollar scale for every month; the tallest bar is labeled
OctNov 2025: $252K to cover taxesNovDec 2025: $2.1M under a disclosed planDecJan 2026: $7.3M under a disclosed plan$7.3MJanFeb 2026: $258K to cover taxesFebMarAprMay 2026: $481K to cover taxesMayJunJulAug 2026: $307K to cover taxesAugSepOct

Pattern

What the filings show, past 12 months. Nothing here rates or predicts.

Roles from filings

Every company we track where this person has filed, newest filing first.

CompanyTitleFirst filingLatest filing
Amprius Technologies, Inc. (AMPX)Chief Technology OfficerSep 16, 2022Aug 25, 2026

Recent filings

The last 5 days with transactions, newest first, one line per trade date. Each number links to an SEC filing.

This page shows only what this person reported on SEC ownership filings. See the methodology. Spotted something wrong? Report an error.