$AMZN - AMAZON SHARES DIP ON SLOWER PRIME SIGN-UPS Amazon fell 1.4% in premarket trading after Reuters reported U.S. Prime memberships rose 5.4 million around Prime Day, about 2% below last year and company targets. Sign-ups beat expectations during the July 8–11 sale but lagged in the weeks before. Amazon said Prime continues to grow, while analysts highlight competition from Walmart+ and consumer pressure from tariffs.