 typically in July. Prime Day accounts for up to 2% of Amazon's net global sales. That's according to CFRA research. Macy's stock tumbled 15% after the department store chain said it terminated talks with private equity firms, Ark House Management and Brigade Capital Management after failing to reach a compelling deal with committed financing. The two firms have been seeking to acquire Macy's since last December and have sweetened the offer twice with the most recent bid being $6.9 billion.