DRDGOLD Limited ADR (DRD) had the highest return in August 2019 by a mid-cap US stock or mid-cap US stock, returning 46.4%.

ASSET	MONTH	% RETURN
DRDGOLD Limited ADR (DRD)	August 2019	46.44%
Silvercorp Metals (SVM)	August 2019	44.93%
Sonos (SONO)	August 2019	33.95%
Shake Shack (SHAK)	August 2019	31.97%
Adaptive Biotechnologies (ADPT)	August 2019	31.91%
Hilton Grand Vacations (HGV)	August 2019	27.92%
Americas Silver (USAS)	August 2019	26.39%
Floor & Decor (FND)	August 2019	24.92%
ADMA Biologics (ADMA)	August 2019	24.1%
Eldorado Gold (EGO)	August 2019	24.02%
PennyMac Finl Svcs (PFSI)	August 2019	23.81%
NovaGold Resources (NG)	August 2019	23.79%
Option Care Health (OPCH)	August 2019	23.67%
SolarEdge Technologies (SEDG)	August 2019	23.02%
Catalyst Pharmaceuticals (CPRX)	August 2019	22.22%
American States Water (AWR)	August 2019	19.87%
Palomar (PLMR)	August 2019	19.74%
Protagonist Therapeutics (PTGX)	August 2019	18.24%
Endeavour Silver (EXK)	August 2019	17.86%
MarketAxess (MKTX)	August 2019	17.36%
Centerra Gold (CGAU)	August 2019	17.1%
Arrowhead Pharmaceuticals (ARWR)	August 2019	17.06%
Skeena Resources (SKE)	August 2019	17.04%
Rhythm Pharmaceuticals (RYTM)	August 2019	16.99%
Seabridge Gold (SA)	August 2019	16.89%

Mid-cap stocks are treated as having a market cap between $2B and $10B.