Cinemark, which owns the theater where this morning’s shooting took place, is -3.2% in early trading. And others are down as well: The largest chain, Regal, is -3.3%, and IMAX is -1.8%. Smaller chains are also off more than the market. Marcus and Reading are both -0.8%. In addition, companies that serve theaters are being hit. Ad sales company National CineMedia is -1.8% and 3-D technology firm RealD is -0.5%. The one big exception is Carmike. It’s up 2.0% following a Bloomberg report last night that said it could be a takeover target.