AmeriGas Partners, L.P.

Atlas Pipeline Partners, L.P.

Blueknight Energy Partners, L.P.

Boardwalk Pipeline Partners, LP

Chesapeake Midstream Partners LP

Compressco Partners, L.P.

DCP Midstream Partners, LP

Dorchester Minerals, L.P.

El Paso Pipeline Partners, L.P.

Enbridge Energy Partners, L.P.

Energy Transfer Partners, L.P.

Enterprise Products Partners L.P.

Exterran Partners, L.P.

Ferrellgas Partners, L.P.

Genesis Energy, L.P.

Inergy, L.P.

Kinder Morgan Energy Partners, L.P.

Legacy Reserves, LP

Linn Energy, LLC

Magellan Midstream Partners, L.P.

Martin Midstream Partners L.P.

Natural Resource Partners L.P.

NuStar Energy L.P.

Plains All American Partners, L.P.

QR Energy, LP

Regency Energy Partners LP

Spectra Energy Partners, LP

StoneMor Partners, L.P.

Targa Resources Partners LP

TransMontaigne Partners, L.P.

Vanguard Natural Resources, LLC

W.P. Carey & Co. LLC