Nio Inc Class A ADR (NIO) had the highest return in July 2019 by a large-cap US stock, returning 30%.

ASSET	MONTH	% RETURN
Nio Inc Class A ADR (NIO)	July 2019	29.96%
Crowdstrike (CRWD)	July 2019	28.9%
Lattice Semiconductor (LSCC)	July 2019	27.83%
MACOM Technology Solutions (MTSI)	July 2019	22.78%
Manhattan Associates (MANH)	July 2019	21.15%
Pan American Silver (PAAS)	July 2019	19.8%
Amkor Technology (AMKR)	July 2019	19.41%
Medpace (MEDP)	July 2019	18.94%
Tower Semiconductor (TSEM)	July 2019	18.14%
Flutter Entertainment (FLUT)	July 2019	17.32%
Universal Health Services (UHS)	July 2019	15.01%
XPO Logistics (XPO)	July 2019	14.41%
Entegris (ENTG)	July 2019	14.4%
United Parcel Service (UPS)	July 2019	14.24%
Hasbro (HAS)	July 2019	14.18%
Snap (SNAP)	July 2019	14.05%
Edwards Lifesciences (EW)	July 2019	14.04%
Anheuser Busch Inbev NV ADR (BUD)	July 2019	14.02%
Royal Gold (RGLD)	July 2019	13.79%
Molson Coors Beverage (TAP.A)	July 2019	13.79%
Zimmer Biomet (ZBH)	July 2019	13.75%
Neurocrine Biosciences (NBIX)	July 2019	12.96%
Teradyne (TER)	July 2019	12.81%
Tenet Healthcare (THC)	July 2019	12.72%
Hershey (HSY)	July 2019	12.66%

Large-cap stocks are treated as having a market cap of $10B+.