Retail stock turnover hits $6.6 trillion as medical AI advances

U.S. markets were closed for the weekend, leaving QQQ at the prior close of 556.22 and SPY at 625.34. U.S. retail stock trading reached a record $6.6 trillion in the first half despite tariff uncertainty and market volatility. Microsoft said its AI diagnostic coordinator achieved high accuracy and argued that medical superintelligence is approaching. Elon Musk also said he had formed the America Party after his split with Trump, adding a political and governance thread around Tesla's chief executive.