Ultra Petroleum Corp. (Ultra) is an oil and gas company. The Company is engaged in the development, production, operation, exploration and acquisition of oil and natural gas properties. Its principal business activities are developing its natural gas reserves in the Pinedale and Jonah fields of the Green River Basin of Wyoming. The Company focuses on sands of the upper Cretaceous Lance Pool in the Pinedale and Jonah fields. The Lance Pool includes sands of the Lance formation at depths between approximately 8,000 and 12,000 feet and the Mesaverde formation at depths between approximately 12,000 and 14,000 feet. The Company conducts its operations in the United States.