Rock-it Natural Stone, Inc. (Big Hill #2)

Solid Rock Stone, Inc. (Calhoun Mine)

Cullum Equipment Services, Inc. (Hanson Mountain Quarry)

APAC-Central, Inc. (Muskogee Sand Plant)

APAC-Central, Inc. (Oologah Facility)

APAC-Central, Inc. (Vinita Quarry)

CP Materials, LLC

Dolese Bros. Co. (Roosevelt Quarry)

Unimin Corp. (Roff Plant)

TXI Operations, LP (Mill Creek Quarry)

Yote Stone (Yote #1)

Rock-it Natural Stone (Tamaha #1)

HSG Acquisition Compay, LLC (Coweta Plant #10)

Muskogee Sand Co., Inc.

J.R.'s Sand/John Vestle

Cargill, Inc.

Dolese Bros. Co. (White Eagle Sand Plant)