• AllianceBernstein Holding L.P.

• American Midstream Partners, LP *

• AmeriGas Partners, L.P.

• Atlas Energy, L.P.

• Blueknight Energy Partners, L.P.

• Compass Diversified Holdings

• Compressco Partners, L.P.

• Copano Energy, LLC

• DCP Midstream Partners, LP*

• Dorchester Minerals, L.P.

• El Paso Pipeline Partners, L.P.

• Energy Transfer Partners, L.P.

• Enterprise Products Partners L.P.

• EV Energy Partners, L.P.

• Exterran Partners, L.P.

• Ferrellgas Partners, L.P.

• Inergy, L.P.

• Kinder Morgan Energy Partners, L.P.

• Legacy Reserves LP

• Linn Energy, LLC

• Magellan Midstream Partners, L.P.

• MarkWest Energy Partners, L.P.*

• Natural Resource Partners, L.P.

• NuStar Energy L.P.

• ONEOK Partners, L.P.

• Plains All American Pipeline, L.P.

• Regency Energy Partners LP

• Rhino Resource Partners LP

• Rose Rock Midstream, L.P.

• StoneMor Partners, L.P.

• Suburban Propane Partners, L.P.

• Tesoro Logistics LP

• Transmontaigne Partners, L.P.*

• Western Gas Partners, LP

• Williams Partners L.P.

• W.P. Carey & Co. LLC

* Headquartered in state