Why Amprius Insiders Are Selling—and Why Bulls Aren’t Panicking

Core Insights - Amprius Technologies (NYSE: AMPX) insiders, particularly CTO Constantin Stefan, have been selling shares under a 10b5-1 Trading Plan, which is not a negative signal for investors as it allows for periodic sales of stock [2][5] - Despite insider selling, insiders still hold nearly 13% of the company's stock, and institutional ownership is gradually increasing, indicating positive sentiment [3][5] - The company is focusing on capacity expansion and cost reduction, particularly through contract manufacturing to comply with the National Defense Authorization Act (NDAA), which is crucial for its defense-related battery markets [6] Insider Activity - Insider selling was executed under a structured plan, and the remaining insider ownership is significant at nearly 13% [2][5] - Institutional interest is on the rise, with buying activity surpassing selling by more than $27 for every $1 sold in Q4 [3] Financial Performance - AMPX stock has seen a price increase of over 400% from its lows in 2025, prompting insiders to realize profits for reasons such as portfolio diversification and tax management [2] - The stock is maintaining a bullish bias, with analysts showing support despite concerns about cash burn and scalability [3][5] Strategic Initiatives - Amprius Technologies is reducing costs and scaling operations by pausing domestic manufacturing to enhance its contract manufacturing network, particularly with South Korean partners [6] - The focus on NDAA compliance is essential as the company targets defense-related markets, including drones and unmanned vehicles [6]