X0306 4 2016-12-01 0 0001513965 American Midstream Partners, LP AMID 0001502553 ARCLIGHT ENERGY PARTNERS FUND V, L.P. C/O ARCLIGHT CAPITAL PARTNERS, LLC 200 CLARENDON STREET, 55TH FLOOR BOSTON MA 02117 1 0 1 1 SEE REMARKS 0001673060 Magnolia Infrastructure Holdings, LLC C/O ARCLIGHT CAPITAL PARTNERS, LLC 200 CLARENDON STREET, 55TH FLOOR BOSTON MA 02117 1 0 1 0 0001638285 Magnolia Infrastructure Partners, LLC C/O ARCLIGHT CAPITAL PARTNERS, LLC 200 CLARENDON STREET, 55TH FLOOR BOSTON MA 02117 1 0 1 0 0001575227 High Point Infrastructure Partners, LLC C/O ARCLIGHT CAPITAL PARTNERS, LLC 200 CLARENDON STREET, 55TH FLOOR BOSTON MA 02117 1 0 1 0 0001441290 ArcLight Capital Holdings, LLC C/O ARCLIGHT CAPITAL PARTNERS, LLC 200 CLARENDON STREET, 55TH FLOOR BOSTON MA 02117 1 0 1 0 0001502945 ArcLight Capital Partners, LLC 200 CLARENDON STREET, 55TH FLOOR BOSTON MA 02117 1 0 1 0 0001405456 Revers Daniel R C/O ARCLIGHT CAPITAL PARTNERS, LLC 200 CLARENDON STREET, 55TH FLOOR BOSTON MA 02117 1 0 1 0 0001526603 American Midstream GP, LLC ATTENTION: REGINA GREGORY 2103 CITYWEST BLVD. | BLDG. 4 - 7TH FLO HOUSTON TX 77042 1 0 1 0 Common Units (Limited Partner Interests) 2016-12-01 4 P 0 626304 14.32 A 4224284 I See Footnote Common units were purchased from AIM Midstream Holdings, LLC by Busbar II, LLC ("Busbar"), a direct, wholly owned subsidiary of ArcLight Energy Partners Fund V, L.P. ("Fund V"). Does not include (i) 7,075,922 Series A-1 Convertible Preferred Units (the "Series A-1 Units") held directly by High Point Infrastructure Partners, LLC ("HPIP"), which do not have an expiration date and are convertible in whole or in part on an approximate 1.0992:1 basis into common units at any time after January 1, 2014, (ii) 3,031,542 Series A-2 Convertible Preferred Units held by Magnolia (as defined below), which do not have an expiration date and are convertible in whole or in part on an approximate 1.0992:1 basis into common units at any time, (iii) 8,792,205 Series C Convertible Preferred Units (the "Series C Units") held directly by Magnolia Infrastructure Holdings, LLC ("Magnolia Holdings"), which do not have an expiration date and are convertible in whole or in part on an approximate 1:1.0007 basis into common units at any time and (iv) 2,333,333 Series D Convertible Preferred Units (the "Series D Units") (Continued from Footnote 2) held directly by Magnolia Holdings and are convertible in whole or in part on one-for-one basis, subject to anti-dilution and certain other adjustments, into common units at any time after June 30, 2017. On or prior to June 30, 2017, subject to certain restrictions, the Issuer may exercise the right to require Magnolia Holdings to sell, assign and transfer all or a portion of the then outstanding Series D Units. Busbar directly owns 2,255,754 common units out of the 4,224,284 common units reflected in Column 5. Magnolia Infrastructure Partners, LLC, an indirect, wholly owned subsidiary of Fund V ("Magnolia"), directly owns 618,921 common units out of the 4,224,284 common units reflected in Column 5. American Midstream GP, LLC (the "General Partner") directly owns 1,349,609 common units out of the 4,224,284 common units reflected in Column 5. 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 and Magnolia Holdings, which owns Magnolia. Fund V through indirectly controlled subsidiaries, owns approximately 90% of the ownership interest in HPIP, which in turn owns 95% of 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 Busbar, Magnolia Holdings, Magnolia, HPIP and the General Partner, but disclaim beneficial ownership except to the extent of their respective pecuniary interests therein. /s/ Daniel R. Revers, MAGNOLIA INFRASTRUCTURE PARTNERS, LLC, By: Daniel R. Revers, President 2016-12-05 /s/ Daniel R. Revers, MAGNOLIA INFRASTRUCTURE HOLDINGS, LLC, By: Daniel R. Revers, President 2016-12-05 /s/ Daniel R. Revers, HIGH POINT INFRASTRUCTURE PARTNERS, LLC, By: Daniel R. Revers, President 2016-12-05 /s/ Regina Gregory, AMERICAN MIDSTREAM GP, LLC, By: Regina Gregory, Senior Vice President 2016-12-05 /s/ Daniel R. Revers, ARCLIGHT CAPITAL HOLDINGS, LLC, By: Daniel R. Revers, Managing Partner 2016-12-05 /s/ Daniel R. Revers, ARCLIGHT CAPITAL PARTNERS, LLC, By: Daniel R. Revers, Managing Partner 2016-12-05 /s/ Daniel R. Revers, ARCLIGHT ENERGY PARTNERS FUND V, L.P., By: ArcLight PEF GP V, LLC, its General Partner, By: ArcLight Capital Holdings, LLC, its Manager, By: Daniel R. Revers, Managing Partner 2016-12-05 /s/ Daniel R. Revers 2016-12-05