Shares of Elevance Health jumped early Thursday in response to better-than-expected fourth- quarter results, and a generally optimistic outlook for the coming year. A week after UnitedHealth Group cast a pall over the health insurance sector with a glum report on its own earnings, Elevance’s results appeared to be improving investors’ moods. Elevance shares were up 4.3% in the morning hours, while the S&P 500 was marginally lower.