• America First Tax Exempt Investors, L.P.*

• Blueknight Energy Partners, L.P.

• Dorchester Minerals, L.P.

• Energy Transfer Partners, L.P.

• Enterprise Products Partners, L.P.

• Ferrellgas Partners, L.P.

• Kinder Morgan Energy Partners, L.P.

• Magellan Midstream Partners, L.P.

• Martin Midstream Partners, L.P.

• Exterran Partners, L.P.

• NuStar Energy, L.P.

• ONEOK Partners, L.P.

• Plains All American Pipeline, L.P.

• Terra Nitrogen Company, L.P.

* Headquartered in state