Mark L. Edmunds

The Dow Chemical Co. engages in the manufacture and distribution of chemicals, plastics, industrial and agricultural products. It serves agriculture, automotive, building and construction, consumer, electronic materials, infrastructure, packaging, product finder and product safety industries. The company was founded by Herbert Henry Dow in 1897 and is headquartered in Midland, MI.

Union Carbide Corp. engages in the production of chemicals and polymers. The firm operates through the following geographical segments: United States, Asia Pacific and Rest of the World. Its products include polyethylene and polypropylene, ethylene glycol, isopropanol, ethyleneamines, biocides, surfactants, deicing and anti-icing fluids, amines, solution vinyl resins and polyethylene glycols. The company was founded on November 1, 1917 and is headquartered in Seadrift, TX.

CARBO Ceramics, Inc. is an oilfield services technology company. The firm manufactures and supplies ceramic proppant and resin-coated sand. It operates through the following segments: Oilfield and Industrial Technologies and Services; and Environmental Technologies and Services. The Oilfield and Industrial Technologies and Services segment manufactures and sells ceramic technology products and services, base ceramic proppant and frac sand for both the oilfield and industrial sectors. The Environmental Technologies and Services segment intends to protect operator?s assets and minimize environmental risks and lower lease operating expense. The company was founded in 1987 and is headquartered in Houston, TX.