Aera Energy LLC

Alabama-Coushatta Indian Tribe

Alta Mesa Resources

Anadarko Petroleum

Apache Corporation

App Energy, LLC

ARB Midstream

Aspect Energy

Atlantic Tubular

AXIO

Baldwin Stocker

Banner Resources LLC

Bass, Edward P.

Bass Enterprises Production Company

Baytech LLP

BHP Billiton

Bison Natural Gas

Blackwell BMC, LLC

BP America

Brazos River Authority

Breitburn Energy

Burlington Resources

Burnett Oil Company

BWA Financial

C.W. Resources, Inc.

Cabot Oil & Gas Corporation

Canyon Express Pipeline

Capataz Operating, Inc.

Carrizo Oil & Gas

Chapman-Wickett Company LLC

Chesapeake Energy Corporation

Chevron Corp.

Cimarex Energy Co.

Citation Oil & Gas

Comstock Resources, Inc.

Concho Resources

ConocoPhillips

Crawley Petroleum Corporation

Crimson Exploration, Inc.

Crow Creek Energy II. LLC

Daybreak Oil & Gas, Inc.

Daystar Operating

Delaware Basin Resources LLC

Devon Energy Production Co.

Dogwood Operating Company, Inc.

Dominion Oklahoma Texas E&P

Donaldson Brown Trusts

Durango Resources

Durant Trust

Dynamic Production

E&B Natural Resources

East Texas Saltwater Disposal Co.

EmKey Resources

Endeavor Oil & Gas, Inc.

EOG Resources, Inc.

Etoco, LP

ExxonMobil Corporation

Famcor Oil, Inc.

FieldPoint Petroleum Corporation

Flint Hills Resources

Forest Oil Corporation

Ft. Apache Energy

Gastar Exploration Texas, L.P.

Gaz du Cameroon

Genesis Producing Company

Gaither Petroleum

Guarantee Royalties, Inc.

Hallwood Energy

Heckman Water Resources

Helis Oil & Gas Company

Hemco Development, LLC

Hillwood Energy Texas, LP

Holmes Exploration, LLC

Horizon Oil & Gas LLC

Hunt Petroleum

Ice Brothers, Inc.

In-N-Out Burgers

J. Cleo Thompson

Juno Operating Company, LLC

Killam Oil & Gas

Kinder Morgan

L.O.G. Energy Exploration Ltd.

Laredo Energy

Laredo Petroleum, Inc.

Latigo Petroleum

Legacy Petroleum Corporation

Linn Energy

Lone Star FLCA

Macpherson Oil Company

Magnum Consulting, LLC

Maguire Oil Company

Manti Operating Company

Marathon Oil Corporation

Matrix Production Company

Mayne & Mertz

Mayo Foundation

McCombs Energy

Merritt Operating

Mewbourne Oil Co.

Milagro Exploration

Milestone Operating, Inc.

Mobley Oil Field Services

Momentum Operating Co., Inc.

National Assoc. of Royalty Owners – California

Occidental Petroleum Corporation

Orion California LP

Orr Energy Group, LLP

Ovation Energy

Pacesetter Energy, LLC

Palaura Exploration

Panhandle Exploration, LLC

Paramount Farming

PB Energy Storage

Penn Virginia Oil & Gas, L.P.

Petrohawk Energy Corporation.

Petroleum Synergy Group, Inc

Plantation Petroleum Company

Premier Energy

Repsol Oil & Gas USA

Rocky Mountain Exploration, Inc.

Rutherford Oil Corporation

Ryan & Co.

Saga Petroleum LLC

Samson Lone Star LP

Sanchez Oil & Gas

Sandridge Energy

Sanguine Gas Exploration

Shell Oil Corporation

Shell Western E&P, Inc.

Square Mile Energy.

Sterling Energy, Inc.

SWN Production Company

Tecpetrol Internacional S.L.U.

Tepee Petroleum

Texas American Resources Company

Texas County District Retirement System

Texas Electric Cooperative

Texas Osage Royalty Pool

Tom East Estate

Valence Operating Company

Waggoner Ranch

Walter Oil & Gas

Weatherford International Ltd.

Whiting Oil & Gas

University Lands

XTO Energy, Inc.

Financial Institutions

Bank of America

Bank of Tokyo – Mitsubishi

Capital Farm Credit

Elm Park Capital Management

Farm Credit Bank of Texas

Horizon Bank NA

ArcLight Capital Partners

JPMorgan Chase NA

Merrill Lynch

Mutual of Omaha Bank

Texas Community Bank

RBC Capital Markets

Wells Fargo Bank NA

Juniper Capital

City, State and Government Entities

City of Fort Worth, Texas

Town of Enchanted Oaks, Texas

Frio County Court, Texas

Reagan County Hospital District, Texas

U.S. Department of Justice

Railroad Commission of Texas

State of California Department of Justice

Texas Comptroller of Public Accounts

Texas County District Retirement System

The Office of the Attorney General, Texas