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 12, 2017	J	93,509	A	—	—	Common Units	104,225	7,280,867	I
Series A-2 Convertible Preferred Units^F4,F3	—	May 12, 2017	J	40,062	A	—	—	Common Units	44,653	3,119,346	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 1:1146 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") received on a quarterly basis as payment-in-kind in lieu of cash distributions on the Series A-2 Units owned on the distribution record date. The Series A-2 Units have no expiration date and are convertible into Common Units at a conversion ratio of 1:1146 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 Magnolia, also owns approximately 90% of the ownership interest in HPIP. HPIP and Magnolia Holdings own respectively, approximately 78% and approximately 22% of American Midstream GP, LLC, (the "General Partner"), the general partner of the Issuer. 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.