- Trobaugh Properties
- Truman F Logsdon
- Turnbow Drilling Co
- Turnbow Drilling Co
- Twin Oaks Construction
- Tyler Oil & Gas Inc
- Tyler Oil & Gas Inc
- Union Valley Petroleum Corp
- Unique Oils
- United Energex Inc
- Van Oil Co
- Van Operating LTD
- Vanguard Production Co
- Vanguard Production Co
- Venture Oil & Gas Inc
- Vernon C Howell
- Vernon E Faulconer Inc
- Veron E Faulconer Inc
- Victory Oil & Gas
- Viking Resources
- Vincent Oil Corp
- Vinson Exploration Inc
- Vintage Petroleum Inc
- W D Kleine's
- W Dale Morris Inc
- W Dale Morris Inc
- W G Arnot Jr
- W L Popejoy
- W W Holmes Oil Co
- W W Holmes Oil Co
- W W Holmes Oil Co
- W W La Force Jr
- W W La Force Jr
- W W Walton LTD
- Wakefield LLC
- Walsh Petroleum
- Walter S Grant
- Walton Producing
- Ward Oil Co
- Warren Corp
- Warwick Associates LC
- Wayne Harper
- Welborn & Markham Oil Operator
- Welborn & Markham Oil Operator
- Welhausen Co
- Wellkat LLC
- Welsh Oil Co Inc
- West Oil
- West Petroleum Corp
- West Petroleum Corp
- Westar Energy Inc
- Western Chief Oil & Gas
- Western Chief Oil & Gas
- Western Oil Producers Inc
- Western Reserves Oil Co
- Westico Energy Co
- Westico Energy Co
- Wetzel Producing Co
- Wheelock Energy
- Whitco Operating Co
- White & Ellis Drilling Inc
- Whiting Petroleum Corp
- Whitt Oil & Gas
- Whitton Co
- William Brock
- William Brock
- William E Brock
- William E Brock
- William E Portman
- Wilson Resources Inc
- Withrow Engineering Inc
- WJC Engineering & Management
- WJH Energy Inc
- Wolf Creek Enterprises Inc
- Wolfson Oil Co
- Xplor Petroleum Corp
- Xtra Energy
- Yates Oil & Gas
- Yost Oil Operations Inc
- Young Living Essential Oils
- Zachry Oil & Gas Properties
- Zephyr Operating Co LLC