Financial Astrology of KLA-Tencor Corporation

FINANCIAL ASTROLOGY

First Trade Date for KLA-Tencor Corporation

Company Name	First Trade Date (yyyy-mm-dd)
KLA-Tencor Corporation	1980-10-08

Company Name	Symbol
KLA-Tencor Corporation	KLAC
History and Business of Company (this information may include date of incorporation)
KLA-Tencor Corporation ("KLA-Tencor") is the world's leading supplier of process control and yield management solutions for the semiconductor and related microelectronics industries. Our comprehensive portfolio of products, software, analysis, services and expertise is designed to help integrated circuit ("IC") manufacturers manage yield throughout the entire fabrication process--from research and development to final mass-production yield analysis. We offer a broad spectrum of products and services that are used by every major wafer, IC and photomask manufacturer in the world. These customers turn to us for inline wafer defect monitoring; reticle and photomask defect inspection; critical dimension ("CD") metrology; wafer overlay; film and surface measurement; and overall yield and fab-wide data analysis. These advanced products, coupled with our unique yield technology services, allow us to deliver the complete yield management solutions our customers need to accelerate their yield learning rates, reduce their yield excursion risks and adopt industry-leading yield management practices. KLA-Tencor was formed in April 1997 through the merger of KLA Instruments and Tencor Instruments, two long-time leaders in the semiconductor equipment industry, each with over 20 years of experience. KLA Instruments Corporation was incorporated in Delaware in 1975; Tencor Instruments was incorporated in California in 1976. Effective April 30, 1997, Tencor Instruments merged into a wholly owned subsidiary of KLA Instruments Corporation. Immediately following this merger, KLA Instruments changed its name to KLA-Tencor. Additional information about KLA-Tencor is available on our web site at www.kla-tencor.com. KLA-Tencor makes available free of charge on its web site its Annual Report on Form 10-K, its Quarterly Reports on Form 10-Q, its Current Reports on Form 8-K and amendments to those Reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, as soon as reasonably practicable after we electronically file them with or furnish them to the Securities and Exchange Commission ("SEC"). Information contained on our web site is not part of this Annual Report on Form 10-K or our other filings with the SEC.

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