Amega West Services,LLC  

Realized in 2010   

Amega is a precision manufacturer of specialty oilfield tools used for directional drilling and other critical service applications. The Company also provides rental services with its large inventory of downhole tools used in directional drilling and related applications. Headquartered in Houston, Texas, Amega has locations in Tyler, Texas, Oklahoma City, Oklahoma, Broussard, Louisiana, West Alexander, Pennsylvania, and Alberta, Canada.  

Aries Energy, LLC

Realized in 2011

Aries Energy acquires and exploits late-life oil and gas assets, using improved engineering and operating practices, such as water flooding, production optimization and additional development. Geographical areas of interest include the Permian Basin, Mid-Continent, East Texas, and Louisiana.  

Bay Oaks Resources, LLC

Bay Oaks Logo

Bay Oaks conducts natural gas exploration and development activites in eastern Oklahoma and western Arkansas.

Captiva Energy, LLC and Captiva II, LLC


Captiva Energy, LLC Realized in 2011 and Captiva II, LLC Realized in 2014

The Captiva companies are oil-focused exploration and development projects located in south-central Kansas.

Cornerstone Natural Resources, LLC


Partially realized in 2014

Cornerstone Natural Resources is a Denver-based independent oil and gas company focused on building a long-live asset reserve base in the Rocky Mountain region. 

Crescent Energy Services, LLC

  Crescent Logo

Crescent provides well abandonment services to the offshore oil and gas industry in the Gulf of Mexico.

Espada Bandera, LLC


Realized in 2010  

Espada is a oil-focused exploration and development project in the South Texas.


Frontier Midstream, LLC


Realized in 2011

Frontier acquires and builds natural gas gathering, processing and transportation systems. The Company's current systems are located in the Fayetteville Shale in Arkansas and the Granite Wash Trend in North Texas.  


FlexEnergy Group

FlexEnergy Holdings, LLC and Flex Leasing Power & Services, LLC were partially realized in 2014 and Enercore, Inc. was realized in 2014

FlexEnergy, LLC manufactures low capacity gas mircoturbine generators for use in oilfield operations and in remote locations both in the U.S. and abroad. The FlexEnergy group includes FlexEnergy Holdings, LLC, Flex Leasing & Power, LLC, IC Recapture Solutions, LLC (renamed IC TRF Holdings, LLC), FlexEnergy Power Solutions, LLC,  and a small interest in Enercore, Inc. Following several transactions related to the FlexEnergy group, ESS Fund currently holds interest FlexEnergy Holdings, LLC and FlexEnergy Power Solutions, LLC.

HV V Invest Lima II AS

(“Core Energy”)


Core Energy is a Norwegian E&P company targeting development & exploration projects in the North Sea and Norwegian Sea. 


Kiamichi Energy Developments,LLC   

Realized in 2009

Kiamichi is a natural gas exploration and development project in the Arkoma Basin of eastern Oklahoma.

Liberty Pressure Pumping, LP

Realized in 2007

Liberty, a startup company that began operations in 2005, provides fracturing and stimulation services to customers in the Barnett Shale trend in North Texas.

Lobos Energy Partners, Inc.  


Realized in 2009

Lobos is an oil and gas operating company focused in the Delaware Basin of Southeast New Mexico.

Logan International, Inc.


Partially realized in 2010

Logan is a leading manufacturer of fishing tools, power swivels and related products items used for the drilling, completion and workover of oil and gas wells. 

Magnolia Oil & Gas, LLC

 Magnolia Logo

Realized in 2015

Magnolia is a exploration and development venture focused on the Wilcox and Tuscaloosa trends in western Mississippi. 



Realized in 2012

Potoco conducts natural gas exploration and development activities targeting the Lower Atoka and adjacent formations in southwestern Arkansas.

R360 Environmental Solutions


Realized in 2012 

R360 is the leading independent provider of environmentally-conscious waste disposal, recycling and treatment solutions to oil and gas producers, consolidating the highly fragmented market for waste treatment, recycling and disposal services to the United States energy markets.  Following  the R360 transaction in 2012, ESS Funds currently holds a small investment in Specialty Waste Operating Partners, LP and Specialty Waste Partners, Inc.

Remora Oil & Gas, Group

 Remora Logo

Remora conducts oil and gas exploration and development activites primarily in three areas of Texas.  The Remora group includes Remora Resources, LLC, Remora Oil & Gas, LLC and Cellar Door, LLC.

RKI Exploration and Production, LLC

 RKI Exploration

RKI was partially realized in 2015 and NewWoods was realized in 2015

RKI operates producing oil and gas properties in Oklahoma, New Mexico, Texas and Wyoming.  Prize Royalties, LLC, was formed in 2011 to hold the overriding royalty interest (ORRI) of some of the RKI Wyoming assets.  Following several transactions related to RKI, ESS Fund currently holds interest in Prize Royalties, LLC and shares of Devon Energy, Inc. and WPX Energy, Inc.

Saber Oil & Gas Ventures, LLC

Realized in 2013

Saber acquires and develops oil and gas properties located in the Permian Basin of West Texas and New Mexico. 

Vermilion Companies

Realized in 2012

The Vermilion Companies pursue exploration and development activities along the Texas and Louisiana Gulf Coasts and in Louisiana state waters.