 Shares of Sequential Brands Group Inc. soared 18.5 in premarket trading Wednesday, as the active and lifestyle brands company said it would explore a potential sale of the company. Sequential Brands, which brands include Jessica Simpson, And 1, GAIAM and Joes Jeans, said it has relaunched a broad exploration of strategic alternatives, which could include a sale, or the divestiture of one or more of its brands. 