Why did Denny's stock soar nearly 60% in November? Here's what Denny's investors and restaurant guests need to know.Shares of Denny's (DENN +0.00%) rose 57.8% in November 2025, according to data from S&P Global Market Intelligence. The soaring gain was a cut-and-dried affair, as the company accepted a buyout offer from a group of private investors on Nov. 3. The stock gained 50.4% the next day and never looked back.NASDAQ : DENNDenny'sToday's Change( 0.00 %) $ 0.00Current Price$ 6.18Key Data PointsMarket Ca ...