Gevo (GEVO) had the lowest return in July 2014 by a US stock in the Energy Sector, returning -40.6%.

ASSET	MONTH	% RETURN
Gevo (GEVO)	July 2014	-40.64%
Houston American Energy (HUSA)	July 2014	-31.91%
Dawson Geophysical (DWSN)	July 2014	-28.54%
New Concept Energy (GBR)	July 2014	-27.85%
Geospace Technologies (GEOS)	July 2014	-27.08%
Mesa Royalty Trust (MTR)	July 2014	-23.14%
PEDEVCO (PED)	July 2014	-21.76%
Obsidian Energy (OBE)	July 2014	-20.96%
Kolibri Global Energy Inc Common stock (KGEI)	July 2014	-20.27%
Talos Energy (TALO)	July 2014	-19.14%
Gran Tierra Energy (GTE)	July 2014	-18.53%
W&T Offshore (WTI)	July 2014	-18.48%
Comstock Resources (CRK)	July 2014	-18.47%
Aspen Aerogels (ASPN)	July 2014	-18.43%
Matrix Service (MTRX)	July 2014	-18.39%
Frontline (FRO)	July 2014	-16.32%
CNX Resources (CNX)	July 2014	-16.16%
Tidewater (TDW)	July 2014	-15.99%
Mexco Energy (MXC)	July 2014	-15.57%
Clean Energy Fuels (CLNE)	July 2014	-15.23%
Dorian LPG (LPG)	July 2014	-14.63%
Kosmos Energy (KOS)	July 2014	-14.02%
Oceaneering International (OII)	July 2014	-13.08%
World Kinect (WKC)	July 2014	-12.83%
Vital Energy (VTLE)	July 2014	-12.82%