HEYCO Energy Group does business in East Texas through two subsidiaries, Rosetta Energy Partners, LP and HEYCO Development Corporation. The companies are currently active in Shelby, Nacogdoches, and San Augustine Counties and focus primarily on the development of unconventional gas reserves.

Rosetta acquired a significant leasehold position in Shelby County that is now under development in a joint venture operated by Newfield Exploration Company, Houston. Rosetta has concentrated on drilling horizontal wells in challenging reservoirs located in environmentally sensitive areas and with Newfield is developing an 11,000 acre tract as a federal unit. With operator Fossil Resources of Dallas, HEYCO Development Corporation has successfully drilled a number of Travis Peak and James Lime wells in Nacogdoches County. The combined gross acres held in East Texas by Rosetta and HEYCO Development equal over 56,000.