BZ Premarket PrepSumner Redstone

The two classes of Viacom stock, the Viacom, Inc. (NASDAQ: VIA) voting rights shares and the Viacom, Inc. (NASDAQ: VIAB) non-voting shares, once traded almost completely in tandem, but they have drifted apart in valuation over the past 15 years. In the past week, that divergence has been a bit more...