Shares of Walt Disney Co. shot up 8.5% in morning trading Monday, to make it them the biggest gainers in both the Dow Jones Industrial Average and S&P 500 , as Wall Street cheered the return of Bob Iger as chief executive officer. The stock’s $8.16 price gain is adding about 52 points to the price of the Dow, which is down 12 points, or less than 0.1%. The media and entertainment giant’s stock has run up 14.9% since the Nov. 9 close of $86.75, which was the lowest close since March 23, 2020, and was on track for the biggest one-day gain since it soared 13.6% on Dec. 11, 2020.

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