By Teresa Rivas Updated March 28, 2018 4:50 p.m. ET The Hot Stock Call it a miracle on 34th Street. Macy's(M) outran the rest of the components of the S&P 500 on Wednesday, helped by rumors that thegovernment may target ecommerce giant Amazon.com(AMZN) with either higher taxes or antitrust regulation. ILLUSTRATION:AGENCE FRANCE-PRESSE/GETTY IMAGES Macy's gained $1.21, or 4.3%, to $29.07. The S&P 500 fell 7.62 points, or 0.29%, to 2605.00. By contrast, Amazon fell more than 4% on rumors that it may be in the White House's crosshairs. However, Macy's wasn't the only retail stock to gain on the news, asKohl's(KSS) ended 2.8% higher as well. And mall real-estate investment trusts (REITs) got a boost too, asSimon Property Group (SPG) gained 3.6%, making it the third-best performer in the S&P 500, and Macerich (MAC) gained 2.5%. Macy's is up 15.4% year-to-date, and 4.1% in the past year. The top five stocks in the S&P 500: Macy's (M): 4.3% Equity Residential(EQR): 3.7% Simon Property Group (SPG): 3.6% CVS Health (CVS): 3.5% Navinet(NAVI): 3.5% The Biggest Loser: Concho Resources(CXO) fell to the back of the S&P 500 pack on news that it will buyRSP Permian(RSPP). ILLUSTRATION:GETTY IMAGES/ISTOCKPHOTO Concho lost $13.75, or 8.8%, to $143.25. By contrast, RSP rose 15.6%, to $45, on the news. Williams Capital Group thinks thatthe move is good for Concho, and could spark a wave of more energy M&A. Concho is down 4.6% year-to-date, but has gained 12.3% in the past year. The bottom five stocks in the S&P 500: Concho Resources (CXO): -8.8% Red Hat(RHT): -5.3% Netflix(NFLX): -5% United Rentals(URI): -4.5% Amazon.com (AMZN): -4.4% https://www.barrons.com/articles/the-biggest-movers-macys-shines-concho-sinks-1522270200