S&P 500 Gains and Losses Today: Palo Alto Networks Surges After Earnings Beat

Key TakeawaysThe S&P 500 slipped 0.2% on Tuesday, Aug. 20, ending a streak of eight consecutive positive trading days for the benchmark index.Shares of medical device makers Insulet and DexCom moved lower as a popular drug from Eli Lilly showed promise in reducing diabetes risk.Palo Alto Networks shares took off after the cybersecurity firm beat quarterly sales and profit estimates. Major U.S. equities indexes finished with minor losses on Tuesday. The S&P 500 fell 0.2%, ending a streak of eight straight wi ...