David J. Butters

Grant Prideco, Inc. is engaged in drill pipe manufacturing. The firm provides engineered connections and premium tubular products that are used in oilfield exploration and development operations. The company was founded in April 2000 and is headquartered in Houston, TX.

ACOL Tankers Ltd. owns and operates crude oil tankers. The private company is based in Athens, Greece.

A subsidiary of Lehman Brothers Holdings, Inc., Lehman Brothers, Inc. is a broker/dealer headquartered in New York City. They provide global equity and fixed research. The equity research department covers more than 100 sectors. They use a fundamental, quantitative, strategic and tactical research approach. In addition to these Lehman has also developed special products, such as 10 uncommon values and 10 uncommon eurovalues.

Weatherford International Ltd. provides equipment and services to the oil and natural gas exploration and production industry. The company was founded in 1972 and is headquartered in Geneva, Switzerland.

GulfMark Offshore, Inc. engages in the provision of marine transportation services to the energy industry through a fleet of offshore support vessels serving major offshore energy markets in the world. It operates its business through the following segments: North Sea, Southeast Asia, and the Americas. Its services include platform supply, anchor handling, towing, marine construction support, and crewboats. The company was founded by Hy Bird in July 1958 and is headquartered in Houston, TX.

Weatherford International, Inc. manufactures drill pipes and oil field equipment. Its products include cavity pumps, reciprocating rod lift systems and gas lift, electric submersible pumps, and hydraulic lift systems. The company was founded in 1972 and is headquartered in Houston, TX.

Navigator Gas Transport Plc owned and operated liquefied petroleum gas carriers. Its services included case studies, newbuild and terminal projects. The company was founded in 2000 and was headquartered in Douglas, Isle of Man.