QXO (QXO) had the lowest return in August 2014 by a large-cap US stock, returning -20%.

ASSET	MONTH	% RETURN
QXO (QXO)	August 2014	-20%
Globus Medical (GMED)	August 2014	-18.87%
Insmed (INSM)	August 2014	-18.3%
Fabrinet (FN)	August 2014	-12.15%
Las Vegas Sands (LVS)	August 2014	-9.52%
T-Mobile US (TMUS)	August 2014	-8.85%
Vale SA ADR (VALE)	August 2014	-8.8%
Wynn Resorts (WYNN)	August 2014	-8.68%
MGM Resorts International (MGM)	August 2014	-8.18%
Cognizant Technology Solutions Corp Class A (CTSH)	August 2014	-6.9%
Ares Management (ARES)	August 2014	-6.9%
Motorola Solutions (MSI)	August 2014	-6.9%
Super Micro Computer (SMCI)	August 2014	-6.81%
Flutter Entertainment (FLUT)	August 2014	-6.57%
Orix Corp Ads (IX)	August 2014	-6.46%
Hudbay Minerals (HBM)	August 2014	-6.38%
Banco Santander Chile (BSAC)	August 2014	-6.17%
Logitech International (LOGI)	August 2014	-5.95%
BWX Technologies (BWXT)	August 2014	-5.9%
Nebius (NBIS)	August 2014	-5.67%
YPF Sociedad Anonima (YPF)	August 2014	-5.6%
Evercore Partners (EVR)	August 2014	-5.59%
Hologic (HOLX)	August 2014	-4.79%
Apollo Global Management LLC Class A (APO)	August 2014	-4.73%
Teck Resources Ltd Class B (TECK)	August 2014	-4.65%

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