Jeff Bezos sold $1.5 billion worth of Amazon shares, following a $737 million sale earlier this month, as part of a pre-approved plan. Despite concerns that insider sales raise, retail sentiment on Stocktwits remains bullish. Amazon shares are up 3.2% YTD, lagging the S&P 500. The company saw record Prime Day sales, easing investor worries over slowing e-commerce and cloud growth.