Despite the fact that the VIA and VIAB shares represent equal ownership stakes in the same company, VIA shares have jumped 7.5 percent in the past five trading sessions to above $40 per share. Over that same stretch, VIAB shares are down 1.1 percent to around $30 per share, leaving Viacom traders scratching their heads about what's going on with the stock. While there is certainly a value to voting rights, there seem to be other market forces in play when it comes to Viacom.