Key TakeawaysThe S&P 500 lost 0.8% on Wednesday, Aug. 7, 2024, as the prior day's stock market rebound failed to maintain its momentum.Super Micro Computer shares lost ground after the company missed profit estimates.Record operating margins helped cybersecurity firm Fortinet top quarterly forecasts, and its shares surged. Major U.S. equities indexes reversed early gains to close lower on Wednesday, as Tuesday's stock market rebound failed to maintain its momentum. The S&P 500 slipped 0.8%, while the Nasdaq ...