X0306 4 2015-12-31 0 0001533454 Northern Tier Energy LP NTI 0001275536 LAMP DAVID L C/O NORTHERN TIER ENERGY LP 1250 W. WASHINGTON ST., SUITE 300 TEMPE AZ 85281 1 1 0 0 President and CEO Common Unit 2015-12-31 4 S 0 60739 25.6365 D 339261 D This sale was made pursuant to a previous election made by the reporting person for the payment of income taxes required to be paid to the Internal Revenue Service as a result of the vesting of the equity award previously granted to the reporting person as compensation for services as an officer. $25.6365 is the weighted average sale price. The common units were sold in various transactions through a broker at prices between $25.5300 per unit and $25.7300 per unit. The reporting person hereby undertakes to provide upon request by the SEC staff, the issuer, or any security holder of the issuer, full information regarding the number of common units sold at each separate price. /s/ David L. Lamp 2016-01-04