U.S. stocks are kicking off December by drifting around their record heights. The S&P 500 rose 0.1% in Monday morning trading after closing its best month of the year at an all-time high. The Dow Jones Industrial Average fell 183 points, and the Nasdaq composite rose 0.4%. Super Micro Computer, a stock that’s been on an AI-driven roller coaster, soared after saying an investigation found no evidence of misconduct by its management or the board. Retailers were mixed coming off Black Friday and heading into what’s expected to be the best Cyber Monday on record. Treasury yields rose in the bond market.