Northern Tier Energy LP, formerly Northern Tier Energy, Inc. is an independent downstream energy company with refining, retail, and pipeline operations that serves the PADD II region of the United States. The Company operates its assets in two business segments: the refining business and the retail business. The Company owns three pipelines. The Company's operations will be conducted through, and its operating assets will be owned by, its wholly owned subsidiary, Northern Tier Energy LLC, and its subsidiaries. Effective November 12, 2013, Western Refining Inc acquired a 38.681% interest in Northern Tier Energy LP.