Vistra gains after topping EBITDA estimate, raising 2026 forecast

** Shares of power producer Vistra VST.N rise 5.2% to $118.8 premarket

** Posts Q3 ongoing operations adjusted EBITDA of $2.38 bln, above analysts' estimate of $2.1 bln - data compiled by LSEG

** Raises midpoint and narrows range for 2026 ongoing operations adjusted EBITDA to $7.1 bln to $7.5 bln

** Board authorizes additional $1.5 bln in share repurchases through 2028

** At last close, shares down 30% YTD