Astera Labs Chairman Manuel Alba Sells 183,000 Shares for $51.3 Million. How Big of a Red Flag Is This?

Astera Labs Chairman Manuel Alba sold 183,000 shares worth $51.3 million on September 1, 2026, through a pre-arranged Rule 10b5-1 trading plan adopted in May. While the sale could indicate concerns about the stock's 54% year-over-year surge, Alba retains 1.4 million shares. Despite strong Q2 2026 results and Wall Street's bullish outlook, the stock's expensive valuation and heavy dependence on Amazon (70% of revenue) present risks for investors.