(September 21, 2015, 11:49 AM EDT) -- WASHINGTON, D.C. — Review of a Second Circuit U.S. Court of Appeals ruling overturning the convictions of two portfolio managers alleged to have engaged in an insider trading scheme is not necessary because the Second Circuit properly determined that no tippee liability existed, one of the portfolio managers argues in an Aug. 24 brief in opposition (United States of America v, Todd Newman, et al., No. 15-137, U.S. Sup.; 2015 U.S. S. Ct. Briefs LEXIS 2887)....