Constantin Ionel Stefan

Companies

• Amprius Technologies, Inc.Chief Technology Officer Sep 16, 2022 to now¹

Holdings

Stock this person has reported owning, from the forms officers and directors file with the SEC. See the biggest insider stakes.

Shares held

• ATAmprius Technologies, Inc. AMPX771,629 shares²$6.0M at $7.73Aug 21, 2026

As of each latest filing. The line shows shares held over time.

Recent filings

• Aug 21, 2026Sold 29,681 shares at $10.34 of Amprius Technologies, Inc.²
• May 27, 2026Sold 3,208 shares at $17.19 of Amprius Technologies, Inc.³
• May 21, 2026Sold 28,812 shares at $14.79 of Amprius Technologies, Inc.⁴
• Mar 4, 2026Granted 110,000 shares of Amprius Technologies, Inc.⁵
• Feb 23, 2026Sold 25,366 shares at $10.16 of Amprius Technologies, Inc.⁶
• Jan 28, 2026Sold 39,690 shares at $12.00 of Amprius Technologies, Inc.⁷
• Jan 28, 2026Exercised options 39,600 shares at $0.05 of Amprius Technologies, Inc.⁷
• Jan 28, 2026Exercised options 90 shares at $0.62 of Amprius Technologies, Inc.⁷
• Jan 23, 2026Sold 1,600 shares at $12.00 of Amprius Technologies, Inc.⁸
• Jan 23, 2026Exercised options 1,600 shares at $0.05 of Amprius Technologies, Inc.⁸
• Jan 22, 2026Sold 492,827 shares at $12.04 of Amprius Technologies, Inc.⁸
• Jan 22, 2026Exercised options 166,104 shares at $0.05 of Amprius Technologies, Inc.⁸
• Jan 22, 2026Exercised options 72,795 shares at $0.45 of Amprius Technologies, Inc.⁸
• Jan 22, 2026Exercised options 253,928 shares at $0.05 of Amprius Technologies, Inc.⁸
• Jan 21, 2026Sold 73,280 shares at $12.00 of Amprius Technologies, Inc.⁸
• Jan 21, 2026Exercised options 15,883 shares at $0.05 of Amprius Technologies, Inc.⁸
• Jan 21, 2026Exercised options 15,834 shares at $0.05 of Amprius Technologies, Inc.⁸
• Jan 21, 2026Exercised options 41,563 shares at $0.62 of Amprius Technologies, Inc.⁸
• Dec 11, 2025Sold 198,255 shares at $10.51 of Amprius Technologies, Inc.⁹
• Dec 11, 2025Exercised options 125,000 shares at $0.05 of Amprius Technologies, Inc.⁹
• Nov 21, 2025Sold 25,024 shares at $10.08 of Amprius Technologies, Inc.¹⁰
• Aug 21, 2025Sold 19,159 shares at $6.82 of Amprius Technologies, Inc.¹¹
• May 21, 2025Sold 20,366 shares at $2.43 of Amprius Technologies, Inc.¹²
• Mar 19, 2025Granted 461,540 shares of Amprius Technologies, Inc.¹³
• Mar 14, 2025Exercised options 3,471 shares at $0.98 of Amprius Technologies, Inc.¹⁴