Karen A. Twitchell

Trecora Resources engages in the manufacture and sale of petrochemical products and synthetic waxes and the provision of custom processing services. It operates through the Specialty Petrochemical and Specialty Waxes segments. The Specialty Petrochemical segment produces high purity hydrocarbons and other petroleum-based products including isopentane, normal pentane, isohexane, and hexane. The Specialty Waxes segment manufactures specialty polyethylene and poly alpha olefin waxes and provides custom processing services. The company was founded on May 4, 1967 and is headquartered in Sugar Land, TX.

Southdown, Inc. used to produce and market cement in the United States. The company operated in three business segments: cement, aggregates and concrete. The company operated 12 portland cement manufacturing plants, 11 quarrying sites and a network of 43 cement storage and distribution terminals located in California, Colorado, Florida, Kentucky, Ohio, Pennsylvania, Tennessee and Texas. The cement segment includes production, importation and distribution of portland and masonry cement

CMC Materials KMG Corp. engages in the production and distribution of specialty chemicals. It operates through the following segments: Electronic Chemicals and Performance Materials. The Electronic Chemicals segment sells wet process chemicals primarily to the semiconductor industry. The Performance Materials segment includes the pipeline performance and wood treating chemicals business platforms. The company was founded in 1992 and is headquartered Fort Worth, TX.

Lyondell Chemical Co. manufactures and distributes chemicals & plastics, produces fuel products, and refines heavy & high-sulfur crude oil. The company operates in four segments: Ethylene Co-Products and Derivatives, Propylene Oxide & Related Products, Refining, and Inorganic Chemicals. The company's products are used in the clothing, food packaging, household furnishings, automotive parts, construction, home-building materials, paints, and coating industries. The company was founded in 1985 and is headquartered in Houston, TX.

Equistar Chemicals LP produces chemicals. It offers polypropylene, ethylene, propylene and polyethylene, ethylene oxide, ethylene glycol, specialty polymers, and polymeric powder. The company was founded in December 1997 and is headquartered in Houston, TX.

Kraton Polymers LLC produces styrenic block copolymers. The company is headquartered in Houston, TX.

Kraton Corp. engages in the manufacture and marketing of styrenic block copolymers, specialty polymers, and other products primarily derived from pine wood pulping co-products. It operates through the Polymer and Chemical segment. The Polymer segment includes styrenic block copolymers and other engineered polymers business. The Chemical segment consists of pine-based specialty products business. The company was founded on February 28, 2001 and is headquartered in Houston, TX.