WASHINGTON, Aug 16: AMIS Holdings Inc., which makes integrated mixed signal semiconductor products for the automotive, medical and industrial markets, on Friday filed for a $517.5 million initial public stock offering.

The Pocatello, Idaho-based company filed a preliminary prospectus with the Securities and Exchange Commission but did not determine the size or estimate the price per share. Those details are expected in future filings.

Its products help digital control circuitry to interpret and manage light, heat, pressure, power and radio waves, which then can drive devices such as motor controllers, switches or various communications.

AMIS said its customers include Alcatel, Delphi Corp., General Electric Co., Guidant Corp., Hewlett-Packard Co., Johnson Controls Inc., Siemens AG and Texas Instruments Inc.

It has applied to list its shares on Nasdaq under the symbol “AMIS.”

Credit Suisse First Boston and Goldman, Sachs & Co., with the assistance of Lehman Brothers will handle the proposed IPO. Merrill Lynch & Co., UBS Investment Bank, SoundView Technology Group and US Bancorp Piper Jaffray were also listed as underwriters.

The proceeds from the IPO may be used for debt repayment and redeeming notes and preferred stock, according to the prospectus.

For the six months ended in June, the company posted a net loss of $5.5 million, compared with a loss of $3.6 million in the same period a year before.

Revenue was $211.2 million in the same six-month period in 2003, compared with $138.5 million in the same period in 2002, according to the SEC filing.—Reuters