AstraZeneca PLC ADR (AZN) had the highest return in April 2014 by a US stock with a market cap of $40B+, returning 21.2%.

ASSET	MONTH	% RETURN
AstraZeneca PLC ADR (AZN)	April 2014	21.19%
Petróleo Brasileiro SA - Petrobras (PBR.A)	April 2014	13.82%
MPLX (MPLX)	April 2014	10.47%
Suncor Energy (SU)	April 2014	10.41%
Interactive Brokers (IBKR)	April 2014	9.89%
Apple (AAPL)	April 2014	9.73%
Micron Technology (MU)	April 2014	9.56%
Petroleo Brasileiro Petrobras SA ADR (PBR)	April 2014	9.13%
Itau Unibanco Banco (ITUB)	April 2014	8.99%
Equinor ASA ADR (EQNR)	April 2014	8.98%
Edwards Lifesciences (EW)	April 2014	8.96%
Entergy (ETR)	April 2014	8.52%
Baker Hughes (BKR)	April 2014	8%
TotalEnergies SE ADR (TTE)	April 2014	7.97%
Barclays PLC ADR (BCS)	April 2014	7.81%
Phillips 66 (PSX)	April 2014	7.77%
Public Service Enterprise (PEG)	April 2014	7.48%
ONEOK (OKE)	April 2014	7.34%
Shell PLC ADR (SHEL)	April 2014	7.22%
Caterpillar (CAT)	April 2014	7.16%
Altria (MO)	April 2014	7.1%
Gilead Sciences (GILD)	April 2014	7.02%
Enterprise Products Partners (EPD)	April 2014	6.98%
Diamondback Energy (FANG)	April 2014	6.89%
Valero Energy (VLO)	April 2014	6.68%