Shares of Macy's (M) gained in trading on Monday as activist investors Barington Capital and Thor Equities called on Macy's to reevaluate its strategy. These investors have urged the retailer to create a real estate unit and explore options for its Bloomingdale's and Bluemercury chains. The group recently built a stake in the retailer but has not disclosed its size. This news was first reported by The Wall Street Journal on Monday.