US STOCKS REBOUNDED AS ANTHROPIC FILED FOR AN IPO, REVIVING ENTHUSIASM FOR THE AI TRADE AHEAD OF EARNINGS FROM ALPHABET, MICROSOFT AND AMAZON. THE S&P 500 ROSE 0.7%, THE NASDAQ 100 GAINED 1.1% AND A KEY SEMICONDUCTOR GAUGE JUMPED 2.8%, WITH INVESTORS FOCUSED ON AI SPENDING PLANS AND WHETHER INVESTMENTS CAN GENERATE SUFFICIENT RETURNS.