T-Mobile US (TMUS) had the lowest return on December 9, 2014 by a large-cap US stock, returning -4.2%.

ASSET	DATE	% RETURN
T-Mobile US (TMUS)	12/9/2014	-4.19%
Globalstar, Inc Common Stock (GSAT)	12/9/2014	-4.14%
Stellantis (STLA)	12/9/2014	-4.02%
YPF Sociedad Anonima (YPF)	12/9/2014	-2.93%
Burlington Stores (BURL)	12/9/2014	-2.02%
GlaxoSmithKline PLC ADR (GSK)	12/9/2014	-1.72%
Nomura Holdings Inc ADR (NMR)	12/9/2014	-1.64%
Brookfield Infrastructure Partners (BIP)	12/9/2014	-1.62%
Coca-Cola Femsa SAB de CV ADR (KOF)	12/9/2014	-1.6%
Everest (EG)	12/9/2014	-1.6%
Arch Capital (ACGL)	12/9/2014	-1.45%
Rentokil Initial (RTO)	12/9/2014	-1.45%
Ryanair Holdings PLC ADR (RYAAY)	12/9/2014	-1.33%
AT&T (T)	12/9/2014	-1.26%
Verizon Communications (VZ)	12/9/2014	-1.22%
Progressive (PGR)	12/9/2014	-1.14%
Fomento Economico Mexicano (FMX)	12/9/2014	-1.07%
Nasdaq (NDAQ)	12/9/2014	-1.04%
InterContinental Hotels Group PLC ADR (IHG)	12/9/2014	-1.02%
W R Berkley (WRB)	12/9/2014	-0.93%
America Movil SAB de CV ADR (AMX)	12/9/2014	-0.81%
EQT (EQT)	12/9/2014	-0.8%
Lennar (LEN.B)	12/9/2014	-0.73%
Telefonica Brasil SA ADR (VIV)	12/9/2014	-0.71%
Novartis AG ADR (NVS)	12/9/2014	-0.71%

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