I once read that 1/3 of all publicly-traded U.S. technology companies had been involved in securities class action litigation. This has trended down this decade, but such cases still are being filed.
Stanford Law School, in cooperation with Cornerstone Research, a firm that consults to attorneys involved in complex business litigation, maintains a securities class action clearinghouse. It provides a wealth of information regarding individual federal class action cases alleging or involving securities fraud. This includes copies of litigation documentation as well as the prosecution, settlement and defense of cases, as well as statistical information.