(February 20, 2019, 2:34 PM EST) -- NEW YORK — A federal district court erred in certifying a class of investors in securities class action lawsuit against Goldman Sachs Group Inc. and certain of its executive officers by making an “unprecedented and incorrect” decision to expand the price maintenance theory in holding that the defendants failed to rebut the Basic Inc. v. Levinson presumption of reliance, the defendants argue in a Feb. 15 appellant brief filed in the Second Circuit U.S. Court of Appeals (Arkansas Teachers Retirement System, et al. v. Goldman Sachs Group Inc., et al., No. 18-3667, 2nd Cir.)....