Kroger (KR) had the lowest return in June 2017 by a US stock in the S&P 500 (GSPC), returning -21.7%.

ASSET	MONTH	% RETURN
Kroger (KR)	June 2017	-21.67%
Howmet Aerospace (HWM)	June 2017	-17.52%
Teradyne (TER)	June 2017	-15.46%
Chipotle Mexican Grill (CMG)	June 2017	-13.28%
Dell Technologies (DELL)	June 2017	-12.07%
KLA-Tencor (KLAC)	June 2017	-12.01%
Costco Wholesale (COST)	June 2017	-11.55%
Match (MTCH)	June 2017	-10.96%
ConAgra Foods (CAG)	June 2017	-10.69%
Dollar Tree (DLTR)	June 2017	-10.39%
O’Reilly Automotive (ORLY)	June 2017	-10.18%
Skyworks Solutions (SWKS)	June 2017	-10.15%
Applied Materials (AMAT)	June 2017	-10.14%
T-Mobile US (TMUS)	June 2017	-10.09%
ON Semiconductor (ON)	June 2017	-10%
Autodesk (ADSK)	June 2017	-9.76%
Campbell Soup Company Common Stock (CPB)	June 2017	-9.7%
Seagate Technology (STX)	June 2017	-9.69%
Ross Stores (ROST)	June 2017	-9.4%
Analog Devices (ADI)	June 2017	-9.32%
Hewlett Packard Enterprise (HPE)	June 2017	-9.24%
Molson Coors Brewing (TAP)	June 2017	-9.13%
Lam Research (LRCX)	June 2017	-8.65%
Netflix (NFLX)	June 2017	-8.63%
Starbucks (SBUX)	June 2017	-8.19%