BRIEF-Tallgrass Energy's Pony express pipeline to build a connection to Holly Frontier Refinery By: Reuters: Company News February 22, 2017 at 17:41 PM EST * Tallgrass Energy's Pony express pipeline to build a connection to Holly Frontier Refinery Read More >> Related Stocks: Tallgrass Energy Gp LP Tallgrass Energy Partners, LP Common Units representing limited partner interest