Mr Cooper (COOP) had the best day between August 21, 2017 and August 30, 2017 by a large-cap US stock or large-cap US stock on August 22, 2017, returning 13.6%.

ASSET	DATE	% RETURN
Mr Cooper (COOP)	8/22/2017	13.64%
Leonardo DRS, Inc Common Stock (DRS)	8/23/2017	13.09%
Centrais Electricas Brasileiras (EBR)	8/22/2017	12.04%
Pure Storage (PSTG)	8/25/2017	10.91%
Carvana (CVNA)	8/30/2017	10.6%
Incyte (INCY)	8/30/2017	9.85%
Tenet Healthcare (THC)	8/21/2017	9.02%
Leonardo DRS, Inc Common Stock (DRS)	8/21/2017	8.94%
AeroVironment (AVAV)	8/30/2017	8.77%
Freedom (FRHC)	8/24/2017	8.08%
Allegheny Technologies (ATI)	8/22/2017	8.02%
Carvana (CVNA)	8/22/2017	7.34%
Centrais Elétricas Brasileiras SA - Eletrobrás (EBR.B)	8/22/2017	7.25%
Sterling Construction (STRL)	8/28/2017	7.23%
Gilead Sciences (GILD)	8/30/2017	7.14%
Okta (OKTA)	8/30/2017	7.04%
argenx NV ADR (ARGX)	8/21/2017	6.86%
Insmed (INSM)	8/22/2017	6.65%
Celsius (CELH)	8/23/2017	6.34%
Lumentum (LITE)	8/22/2017	6.05%
Coeur Mining (CDE)	8/28/2017	5.93%
Coeur Mining (CDE)	8/21/2017	5.68%
Liberty Media Corporation Series A Liberty Formula One Common Stock (FWONA)	8/22/2017	5.5%
Martin Marietta Materials (MLM)	8/30/2017	5.38%
Carvana (CVNA)	8/21/2017	5.33%

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