Affirm (NASDAQ: AFRM) stock has declined by 17.5% over 5 trading days. While company-specific news has been somewhat limited, insider selling appears to have weighed on the stock with a substantial share sale by CEO Max Levchin.CHONGQING, CHINA - AUGUST 26: In this photo illustration, a person holds a smartphone displaying the logo of Affirm Holdings, Inc. (NASDAQ: AFRM), a leading American financial technology company specializing in buy now, pay later (BNPL) services, with the company's branding visible i ...