( January 31, 2018, 1:56 PM EST) -- BOSTON — Federal merger and acquisition (M&A) transaction securities class action lawsuit filings more than doubled in 2017 helping the total number of filings for the year to reach record numbers for the second straight year — the most since the Private Securities Litigation Reform Act of 1995 (PSLRA), 15 U.S.C. § 78u-4, was enacted, according to an annual report released by economic and financial consulting firm Cornerstone Research and the Stanford Law School Securities Class Action Clearinghouse on Jan. 30....