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.

Constellation Energy Partners LLC

CVR Partners, LP

DCP Midstream Partners, LP

Dorchester Minerals, L.P.

El Paso Pipeline Partners, L.P.

Enbridge Energy Partners, L.P.

Enterprise Products Partners L.P.

EV Energy Partners, L.P.

Exterran Partners, L.P.

Ferrellgas Partners, L.P.*

Genesis Energy, L.P.

Kinder Morgan Energy Partners, L.P.

Linn Energy, LLC

Magellan Midstream Partners, L.P.

Martin Midstream Partners L.P.

Mid-Con Energy Partners, LP

Natural Resource Partners L.P.

NGL Energy Partners LP

NuStar Energy L.P.

ONEOK Partners, L.P.

Plains All American Pipeline, L.P.

Regency Energy Partners LP

Rose Rock Midstream, L.P.

StoneMor Partners, L.P.

Targa Resources Partners LP

Western Gas Partners, L.P.

Williams Partners, L.P.

W.P. Carey & Co. LLC