Alnylam Pharmaceuticals (ALNY) had the highest return on February 15, 2012 by a large-cap US stock, returning 12.5%.

ASSET	DATE	% RETURN
Alnylam Pharmaceuticals (ALNY)	2/15/2012	12.46%
Devon Energy (DVN)	2/15/2012	5.16%
NXP Semiconductors (NXPI)	2/15/2012	4.48%
Deckers Outdoor (DECK)	2/15/2012	3.35%
Charter Communications (CHTR)	2/15/2012	2.95%
MercadoLibre (MELI)	2/15/2012	2.52%
NetEase (NTES)	2/15/2012	2.47%
PACCAR (PCAR)	2/15/2012	2%
Gildan Activewear (GIL)	2/15/2012	1.96%
Edwards Lifesciences (EW)	2/15/2012	1.77%
EnergySolutions (ES)	2/15/2012	1.75%
Cheniere Energy Partners (CQP)	2/15/2012	1.71%
Infosys Ltd ADR (INFY)	2/15/2012	1.61%
United Microelectronics (UMC)	2/15/2012	1.53%
CBRE Group Inc Class A (CBRE)	2/15/2012	1.52%
Tesla (TSLA)	2/15/2012	1.51%
Verisk Analytics (VRSK)	2/15/2012	1.47%
United Therapeutics (UTHR)	2/15/2012	1.47%
Regions Financial (RF)	2/15/2012	1.4%
EQT (EQT)	2/15/2012	1.39%
RB Global (RBA)	2/15/2012	1.28%
ASE Industrial Holding Co Ltd ADR (ASX)	2/15/2012	1.23%
Texas Instruments (TXN)	2/15/2012	1.21%
Fomento Economico Mexicano (FMX)	2/15/2012	1.16%
CenterPoint Energy (CNP)	2/15/2012	1.13%

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