Mealey's (December 22, 2020, 1:47 PM EST) -- CHICAGO — A federal judge in Illinois on Dec. 21 certified a shareholder class in a securities class action against Allstate Corp. and certain current and former senior executives stemming from alleged misrepresentations the defendants made concerning changes to the insurer’s claims frequency for its automobile insurance business, ruling that an expert report provided by the defendants failed to sufficiently rebut the investors’ price impact allegations as required under the Basic Inc. v. Levinson presumption of reliance (In re The Allstate Corp. Securities Litigation, No. 16-10510, N.D. Ill., 2020 U.S. Dist. LEXIS 239236)....