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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1533454	Northern Tier Energy Lp	NTI	Petroleum Refining (2911)	800763623

Insiders

Cik	Name	Reported Address	Director	Officer	Large Shareholder	Other
1554545	Acon Funds Management, L.l.c.	1133 Connecticut Avenue, Nw, Ste 700 Washington DC 20036	Yes	No	Yes	No
1554546	Acon Refining Partners, L.l.c.	1133 Connecticut Ave., Nw, Ste 700 Washington DC 20036	Yes	No	Yes	No
1554554	Aip V Genpar, L.l.c.	C/O Acon Funds Management 1133 Connecticut Avenue, Nw, Ste 700 Washington DC 20036	Yes	No	Yes	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Units	Disposition	2013-05-23	1,800,000	$25.23	47,122,500	No	4	S	Indirect	See footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	See footnote

Footnotes

The price represents the public offering price of $26.28 per common unit ("Common Unit") of Northern Tier Energy LP (the "Issuer") less the underwriters' discount of $1.0512 per Common Unit.
The securities reported in this statement are held by Northern Tier Holdings LLC ("Holdings"). Northern Tier Investors, LLC ("Investors LLC") is the sole owner of the common interests in Holdings. The sole member of Investors LLC is Northern Tier Investors LP ("Investors LP"). The general partner of Investors LP is NTI GenPar LLC. ACON Refining Partners, L.L.C. ("Refining") owns 48.75% of the Class A common units in Investors LP and 50% of the limited liability company interests in NTI GenPar LLC. AIP V GenPar, L.L.C. ("GenPar") is the managing member of Refining. ACON Funds Management, L.L.C. ("Management") is the managing member of GenPar.