Security	Conv. / exercise price	Date	Code	Shares	A/D	Exercisable	Expires	Underlying	Underlying shares	Owned after	D/I
Series A-1 Convertible Preferred Units^F2,F1	—	May 13, 2016	J	208,601	A	—	—	Common Units	228,973	6,858,815	I
Series A-2 Convertible Preferred Units^F4,F3	—	May 13, 2016	J	89,371	A	—	—	Common Units	98,099	2,938,527	I

Explanation of responses

F1Represents Series A-1 Convertible Preferred Units (the "Series A-1 Units") held directly by High Point Infrastructure Partners, LLC ("HPIP") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-1 Units owned on the distribution record date. The Series A-1 Units have no expiration date and are convertible in whole or in part into common units of the Issuer ("Common Units") at a conversion ratio of 1:1.098 at any time.
F2Represents the aggregate number of Series A-1 Units held after the acquisition of Series A-1 Units reported in Column 5 of this line item.
F3Represents Series A-2 Convertible Preferred Units (the "Series A-2 Units") held by Magnolia Infrastructure Partners, LLC ("Magnolia"). The Series A-2 Units have no expiration date and are convertible into Common Units at a conversion ratio of 1:1.098 at any time.
F4Represents the aggregate number of Series A-2 Units held after the acquisition of Series A-2 Units reported in Column 5 of this line item.

Remarks

ArcLight Capital Holdings, LLC ("ArcLight Holdings") is the sole manager and member of ArcLight Capital Partners, LLC ("ArcLight Partners" and, together with ArcLight Holdings and Fund V, the "ArcLight Entities"). ArcLight Partners is the investment adviser to Fund V. ArcLight Holdings is the manager of the general partner of Fund V. Mr. Revers is a manager of ArcLight Holdings and a managing partner of ArcLight Partners and has certain voting and dispositive rights as a member of ArcLight Partners' investment committee. Fund V directly owns Busbar II, LLC ("Busbar") and Magnolia Holdings, which owns Magnolia. Fund V, through indirectly controlled subsidiaries, also owns approximately 90% of the ownership interest in HPIP, which in turn owns 95% of American Midstream GP, LLC (the "General Partner"). As a result, the ArcLight Entities and Mr. Revers may be deemed to indirectly beneficially own the securities of the Issuer held by Magnolia Holdings, Busbar, Magnolia, HPIP and the General Partner, but disclaim beneficial ownership except to the extent of their respective pecuniary interests therein.