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Press Release
Panther Energy Company is funded through a $375 million equity commitment from Kayne Anderson Energy Fund VIII, LP, co-investors and Panther III’s management team. We're currently using this money to develop the best oil and gas projects in the US.

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Louisiana - Austin Chalk
Panther has leased ~50k net acres in the Austin Chalk that is highly contiguous, has long lease terms, and is drill ready for extended laterals.

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Wyoming - Powder River Basin
Panther is currently drilling in a productive region of Wyoming's Powder River Basin.

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Press Release

  • Production of 6,500 boe/d, of which 55% is oil, from 23 producing wells including 17 horizontals

  • Two drilled but uncompleted (DUC) horizontal laterals

  •  920 gross undeveloped locations in the geologic sweet spot of the Delaware basin




Press release

  • Added approximately 36.4 million barrels of oil equivalent (MMboe) proved reserves that are 45% oil and 21% natural gas liquids (NGLs), of which 34% were proved developed producing at sale

  • Increased net current daily production by approximately 8,000 boe per day (67% liquids)

  • Enhanced drilling inventory with over 700 low-risk, repeatable horizontal drilling opportunities

  • Added approximately 280 gross producing wells that are over 80% operated with an average 69% working interest and 55% net revenue interest

  • Provided more than 100 Mmboe in internally estimated resource potential



Press release
• Net production of approximately 2,700 barrels of oil equivalent per day from approximately 170 producing wells at time of sale
• Proved reserves of approximately 10 million barrels of oil equivalent (45% oil, 37% proved developed); 
• Total acreage position of 140,000 gross (44,000 net) acres 
• More than 165 proved low-risk infill drilling locations



Panther Energy Company III, LLC (PEC) is a Tulsa, Oklahoma based Exploration & Production Company. We specialize in the horizontal exploration of unconventional zones, but also develop conventional reserves of both oil and gas. Panther focuses on developing O&G projects in the continental United States with a highly trained and experienced staff.

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President and CEO

Berry attended New Mexico State University with a major in Business Administration. During school, he worked as a roughneck in NM and CO and started his first business before finishing school. Since then Berry has formed and sold one construction company and four E&P companies. This includes multiple transactions from $200K to almost $900 Million. Since pairing with Roy Grossman in 1994, total transaction value exceeds $2 billion and total funding through debt, mezzanine, private equity, etc. exceeds $750 million. Berry's leadership has propelled Panther to ever increasing value and size.



Executive Vice President and COO

Roy graduated from the University of California with a degree in Engineering and holds a Master’s Degree from the University of Idaho. Roy's extensive experience in the petroleum industry dates back to 1969. In 2003, along with Berry Mullennix and Kayne Anderson Energy Fund, he formed Cannon Energy. By 2005, they had formed Panther Energy Company. Since that time Roy's attention to detail has produced results that are undeniable with prospects that are expertly developed.




Jeff graduated from Brigham Young University in 1985, receiving a Bachelor of Administration degree in Accounting.  He later graduated from the University of Tulsa in 1992, receiving a Master of Business Administration. Jeff went on to accrue over 25 years of business experience playing major roles in Amoco and Williams. He joined Panther Energy Company in 2012 as our CFO and has helped the company with expert financial guidance and planning.

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Executive VP Business Development

Jim holds a Juris Doctorate from South Texas College of Law and is a member of the State Bar of Texas. He also has a Master’s Degree in Business Administration from Houston Baptist University and a Bachelor of Arts degree in History from the University of Central Oklahoma. Jim has over 30 years of experience in domestic and international energy business development, major project and operations management, land management and major A&D transactions. As a member of the Panther team he works through a massive network of petroleum industry pros to acquire and divest deals of every size.

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Marketing Manager

Robert graduated from Kansas State University with a BS in Management and he also holds a BS in Accounting from Wichita State University. Robert has over 25 plus years of experience in the energy sector.  He has previously held positions with Enerfin Resources, a Midstream company located in Oklahoma, Vintage Petroleum, and Hess Corporation. As the Marketing Manager at Panther Energy II and Panther Energy I., he was responsible for all aspects associated with marketing the oil and gas.  Areas of experience with Panther include the Permian, Anadarko, and the Mid-Continent.


Vice President Geology

Paul holds a B.S. in Geology from the University of Oklahoma and an M.S. in Geology from Oklahoma State University. He joined Panther after successful time at Devon Energy and Double Eagle Energy Holdings. Paul is particularly experienced with project generation in Oklahoma and the Rockies.


Vice President Reservoir Engineering

Diggs graduated from the University of Tulsa with a Bachelor of Science in Petroleum Engineering in 1987.  He is also a 1990 graduate of Thunderbird with a Master of Business Administration.  He has over 30 years of oil and gas industry experience in business unit management, business development, asset management, oil and gas evaluation and operations. At Panther he's responsible for understanding and forecasting the economic value of our projects.


Vice President Land

Josh received his Bachelor of Arts in Business Administration from the University of Central Oklahoma and his Master of Science in Energy Legal Studies from Oklahoma City University.  He began his career with Chesapeake Energy working the Fayetteville Shale. He served as a Senior Landman for Apache Corp. as part of its SCOOP and New Ventures teams which helped build Apache’s 50,000 acre position in SCOOP. Most recently he served as Land Manager for Atalaya Resources, LLC working STACK. Joining the team as Land Manager in November 2017, Josh Cornell has 12 years experience working as a landman.

Ken Fayard

Vice President Operations

Ken graduated from Southeastern Louisiana University with a Bachelors of Science degree in industrial technology and holds a Master’s of Engineering degree from Tulane University.  His career in O&G started in 1977.  Some of his notable early experience includes management of offshore platforms and inland water facilities for Chevron, work on the U.S. Strategic Petroleum Reserve for the Department of Energy, and time as a District Engineer for Vintage Petroleum. After Vintage, Ken continued to develop his skillset with companies like Williams, Petrohawk, and Sheridan Production. In 2019, Mr. Fayard joined the team at Panther Energy as our Vice President of Operations bringing all of that knowledge and experience with him. 

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Based in Tulsa, Oklahoma, Panther Energy Company specializes in grassroots horizontal exploration of unconventional zones, while also developing conventional reserves of both oil and gas. The company’s founders, Chief Executive Officer Berry Mullennix and Chief Operating Officer Roy Grossman met in the mid-1990’s.


In 1998 the partners entered the Arkoma Basin with the idea of drilling the thin Hartshorne Coal seams in Hughes County horizontally. They pioneered the use of focused gamma tools to stay in zones that averaged only five feet. The pair drilled dozens of horizontal wells and acquired over 35,000 acres. In September 2001, only five days before the tragic events of 9/11 unfolded, Mannix Oil Company was sold to Williams Companies of Tulsa.


In early 2002, Roy and Berry formed another company that soon became Cannon Energy Company, LLC. They looked for other coal bed methane (CBM) plays to apply their technical skills and began drilling in the Cherokee Basin of northeastern Oklahoma and southeastern Kansas. The company eventually raised equity capital from Kayne Anderson in Houston, Texas, in 2003 and added CBM assets in the Piceance Basin near Grand Junction, Colorado.


In 2004, Cannon Energy Company, LLC, partnered with Red Willow Production Company from Ignacio, Colorado, near Durango, and began a project in Lipscomb County, Texas, to explore the Atoka Shale. After shedding its CBM assets, the company began a horizontal drilling program in the Anadarko Basin.


In February 2005, Roy and Berry brought in the parent entity of Red Willow Production and the Southern Ute Indian Tribe (SUIT) Growth Fund and bought out the interests of Kayne Anderson to form Panther Energy Company, LLC.


Over the next few years, the company expanded its Anadarko play by 150,000 gross acres and drilled over 150 horizontal Cleveland, Marmaton, Cottage Grove, and Atoka wells. The company also expanded again into the Arkoma Basin, California, Montana, and North Dakota, focused upon expanding its crude oil assets.


In 2007, Panther sold its Arkoma assets to Canaan Energy. Since 2010, Panther also sold its California assets and exited the Bakken Play in North Dakota and Montana, selling to Brigham Exploration. In June 2011 the company sold a forty percent interest in its Anadarko Basin project to Linn Energy.


In 2012, Panther Energy Company was focused in the Mid-Continent region and ran six to eight rigs with an annual drilling budget of $300-350 million. The company grew from 18 employees in 2005 to over 85 employees in 2013 and opened a field yard and an office in Perryton, Texas. The company also grew its production in which it had interest to approximately 9,000 barrels of oil per day (BOPD) and over 40 million cubic feet of gas per day (MMCFD). The company also contributed to a variety of charitable organizations including the Iron Gate, Philbrook Museum of Art, Red Cross, and the United Way.


In 2012, Panther sold its Mid-Continent region assets in three separate transactions to Sandridge Exploration and Production, LLC, Eagle Energy Acquisitons, LP and Midstates Petroleum Company, Inc.  Later that same year, Panther Energy Company II, LLC was formed.


From 2013 – 2016, Panther Energy Company II, LLC focused on the Delaware Basin and leased over 27,000 net acres in Reeves, Loving, Ward and Culberson counties.  In January 2017, Panther II sold all of its Delaware Basin assets in two separate transactions to RKI Exploration & Production, LLC and Scala Energy Assets, LLC for a combined $863 million.  Following the Delaware Basin asset sale, Panther Energy Company III, LLC was formed.


Panther Energy is led by a group of visionary leaders and employees including: President and CEO Berry Mullennix; Senior Vice President and COO Roy Grossman; Vice President and Chief Financial Officer Jeff Nevins; Vice President – Business Development, Jim Stone; Vice President – Geology, Paul Richardson; Vice President – Engineering, William Diggs; Principal Petrophysicist, Phil Schenewerk and Land Manager, – Joshua Cornell.

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