Westinghouse Air Brake Technologies (WAB) had the lowest return in July 2017 by a US stock in the S&P 500 (GSPC), returning -18.1%.

ASSET	MONTH	% RETURN
Westinghouse Air Brake Technologies (WAB)	July 2017	-18.09%
Chipotle Mexican Grill (CMG)	July 2017	-17.33%
Seagate Technology (STX)	July 2017	-15.31%
Altria (MO)	July 2017	-13.04%
Ulta Beauty (ULTA)	July 2017	-12.68%
Tesla (TSLA)	July 2017	-12.63%
Interpublic Group of Companies (IPG)	July 2017	-12.55%
Domino's Pizza Inc Common Stock (DPZ)	July 2017	-11.84%
Southwest Airlines (LUV)	July 2017	-11.21%
United Airlines (UAL)	July 2017	-10.77%
Johnson Controls International (JCI)	July 2017	-10.69%
Pool (POOL)	July 2017	-10.57%
Northern Trust (NTRS)	July 2017	-10.4%
CSX (CSX)	July 2017	-9.88%
Universal Health Services (UHS)	July 2017	-9.41%
Delta Air Lines (DAL)	July 2017	-9.03%
DexCom (DXCM)	July 2017	-8.95%
Genuine Parts (GPC)	July 2017	-8.48%
Starbucks (SBUX)	July 2017	-8.35%
WW Grainger (GWW)	July 2017	-8.25%
HCA (HCA)	July 2017	-8.16%
Norfolk Southern (NSC)	July 2017	-7.96%
Lennox International (LII)	July 2017	-7.32%
Darden Restaurants (DRI)	July 2017	-6.86%
O’Reilly Automotive (ORLY)	July 2017	-6.6%