Lam Achieves ISO 14001 Environmental Management System Registration
May 20, 2003

Lam Achieves ISO 14001 Environmental Management System Registration FREMONT, Calif., May 19, 2003-Lam Research Corporation (Nasdaq: LRCX) today announced achieving ISO (International Organization for Standardization) 14001 certification for its environmental management system (EMS) from the National Standards Authority of Ireland (NSAI).

The certification identifies Lam as one of a select group of semiconductor equipment companies whose environmental practices are in compliance with the standard. Lam obtained ISO 14001 certification following a thorough review of its environmental program and practices by the NSAI, one of several independent accrediting organizations. The Company is also registered for ISO 9001:2001, the standard for quality management systems.

"NSAI's validation of our EMS program with this certification informs our customers and the community that Lam upholds the highest standards of responsible business behavior," said Steve Newberry, Lam's president and chief operating officer. "This registration serves as yet another benchmark for our customers and business associates to use in evaluating Lam's commitment to corporate responsibility and sound business practices."

The ISO 14001 international standard was established in 1996 to provide third-party validation of a company's environmental management system to ensure a defined structure for organizations and their partners for managing environmental issues. ISO, a non-governmental organization established in 1947, is a worldwide federation of national standards bodies from more than 140 countries.

This press release is based on current conditions and information. Those conditions are subject to change, and Lam's operations are subject to changes in condition, significance, value and effect as well as other risks detailed in documents filed with the Securities and Exchange Commission, including specifically the reports on Form 10-K for the year ended June 30, 2002, and the Form 10-Q for the quarter ended March 30, 2003, which could cause actual results to vary from expectations. The Company undertakes no obligation to update the information or statements made in this press release.

Lam Research Corporation is a leading supplier of wafer fabrication equipment and services to the world's semiconductor industry. Lam's common stock trades on the Nasdaq National Market under the symbol LRCX. The Company's World Wide Web address is