Plus: Humana, UnitedHealth Group among big insurers whose shares fall as a result of Democratic presidential nominee Kamala Harris\u2019s strong debate performance. Dave & Buster\u2019s shares rise after earnings beat expectations. J.R. Whalen reports.\n\n\n\nSign up for the WSJ's free What's News newsletter.\xa0\n\n\n\nLearn more about your ad choices. Visit megaphone.fm/adchoices