X0306 4 2016-10-24 0001591763 Enable Midstream Partners, LP ENBL 0001502945 ArcLight Capital Partners, LLC 200 CLARENDON STREET 55TH FLOOR BOSTON MA 02117 true 0001441290 ArcLight Capital Holdings, LLC 200 CLARENDON STREET 55TH FLOOR BOSTON MA 02117 true 0001605222 Bronco Midstream Infrastructure, LLC 200 CLARENDON STREET 55TH FLOOR BOSTON MA 02117 true 0001605216 Enogex Holdings LLC 200 CLARENDON STREET 55TH FLOOR BOSTON MA 02117 true 0001399007 ArcLight Energy Partners Fund IV LP 200 CLARENDON STREET 55TH FLOOR BOSTON MA 02117 true 0001502553 ARCLIGHT ENERGY PARTNERS FUND V, L.P. 200 CLARENDON STREET 55TH FLOOR BOSTON MA 02117 true 0001605221 Bronco Midstream Partners, L.P. 200 CLARENDON STREET 55TH FLOOOR BOSTON MA 02117 true 0001405456 Revers Daniel R 200 CLARENDON STREET 55TH FLOOR BOSTON MA 02117 true Common Units representing limited partners interests 2016-10-24 4 S 0 24683 15.1 D 45863429 I See Footnotes Common Units representing limited partners interests 2016-10-25 4 S 0 12224 15.07 D 45851205 I See Footnotes This Form 4 is filed jointly by ArcLight Capital Partners, LLC ("ArcLight Capital Partners"), ArcLight Capital Holdings, LLC, ArcLight Energy Partners Fund V, L.P. ("Fund V"), ArcLight Energy Partners Fund IV, L.P. ("Fund IV"), Bronco Midstream Partners, L.P. ("Bronco Midstream"), Bronco Midstream Infrastructure, LLC ("Bronco Infrastructure") and Enogex Holdings LLC ("Enogex Holdings") and collectively with the foregoing and their respective general partners and subsidiaries "ArcLight"). ArcLight Capital Partners has ultimate voting and investment control over the securities reported herein. Due to certain voting rights granted to Mr. Revers as a member of ArcLight Capital Partners' investment committee, Mr. Revers may be deemed to indirectly beneficially own the units attributable to ArcLight Capital Partners, LLC, but disclaims any such ownership except to the extent of his pecuniary interest therein. The Common Units are held directly by Bronco Infrastructure and Enogex. ArcLight Capital Partners is the investment advisor for, and ArcLight Capital Holdings, LLC is the managing member of the general partner of each of Fund IV, Fund V and Bronco Midstream. Bronco Infrastructure is an indirect wholly-owned subsidiary of Enogex. The price reported in Column 4 is a weighted average price. These Common Units were sold in multiple transactions at prices ranging from $15.00 to $15.37, inclusive. The reporting person undertakes to provide to Enable Midstream Partners, LP, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of Common Units sold at each separate price within the ranges set forth in footnotes (3) and (4) to this Form 4. The price reported in Column 4 is a weighted average price. These Common Units were sold in multiple transactions at prices ranging from $15.00 to $15.34, inclusive. ARCLIGHT CAPITAL PARTNERS, LLC By: /s/ Daniel R. Revers Daniel R. Revers, Managing Partner 2016-10-26 ARCLIGHT CAPITAL HOLDINGS, LLC By: /s/ Daniel R. Revers Daniel R. Revers, Manager 2016-10-26 BRONCO MIDSTREAM INFRASTRUCTURE, LLC By: /s/ Daniel R. Revers Daniel R. Revers, President 2016-10-26 ENOGEX HOLDINGS LLC By: /s/ Daniel R. Revers Daniel R. Revers, President 2016-10-26 ARCLIGHT ENERGY FUND IV, L.P. By: ArcLight PEF GP IV, LLC, its general partner By: ArcLight Capital Holdings, LLC, its manager By: /s/ Daniel R. Revers Daniel R. Revers, Managing Partner 2016-10-26 ARCLIGHT ENERGY FUND V, L.P. By: ArcLight PEF GP V, LLC, its general partner By: ArcLight Capital Holdings, LLC, its manager By: /s/ Daniel R. Revers Daniel R. Revers, Managing Partner 2016-10-26 BRONCO MIDSTREAM PARTNERS, L.P. By: ArcLight Bronco Partners GP, LLC, its general partner By: /s/ Daniel R. Revers Daniel R. Revers, President 2016-10-26 /s/ Daniel R. Revers Daniel R. Revers 2016-10-26