CBS’s lawsuit against National Amusements, its controlling shareholder, is a last-ditch effort to block a merger with Viacom. But it is also a challenge to the company’s dual-class stock structure and, by extension, similar structures that are increasingly common, especially among tech companies. The challenge comes as these dual-class, or super-voting, structures are under fire by regulators, index providers and the courts. National...

Source: Wall Street Journal May 15, 2018 18:33 UTC