AMPX Amprius Technologies, Inc. Insider Trading

Director Kang Sun sold 67,796 shares of AMPX at $14.79; stock now $17.83, down 13.7% in 30 days despite +61.2% 90-day surge.

Kang Sun sold 67,796 shares (67.8K shares) on 2026-05-21 at $14.79, reducing his holdings by 5.0% to 1,280,854 shares (1.28M shares). The stock has since risen to $17.83, placing the transaction 21.8% below the 52-week high. At the same-ticker level, his prior 5 trades at AMPX showed 3 of 5 were well-timed at the 90-day mark, suggesting contextual skill in identifying downturns, though this sale occurred during a period of strong recent momentum (90-day change: +61.2%) following a recent 13.7% decline over 30 days. The company reported $28.5M in quarterly revenue with annual growth of +202.1%, but remains unprofitable (net loss $5.0M in the latest quarter). The sale leaves substantial remaining exposure (1.28M shares still held), indicating continued conviction despite the transaction.

CEO Thomas M Stepien sold 60,702 shares of AMPX at $14.79 for $897,685.46; stock now at $17.83, -21.8% from 52-week high.

Thomas M Stepien, as CEO, sold 60,702 shares on 2026-05-21 at $14.79, reducing his holdings by 8.0% from 760,000 shares to 699,298 shares. The transaction occurred when the stock was trading significantly below its 52-week high of $22.80, and the current price of $17.83 now sits -21.8% from that peak. While Amprius Technologies has demonstrated strong annual revenue growth of +202.1%, the company remains unprofitable with a net income of $-5,046,000.00 in the latest quarter against $28,536,000.00 in revenue. The sale's position in the stock's recent trading arc—following a 90-day rise of +61.2% but a 30-day decline of -13.7%—invites scrutiny into the CEO's capital allocation decisions at a critical moment for a high-growth but loss-making enterprise.