Exhibit 99.1

              AMIS Holdings, Inc. Updates Second Quarter Guidance;
           AMIS Reiterates Second Quarter Earnings Per Share Guidance

    Business Editors/Technology Editors

    POCATELLO, Idaho--(BUSINESS WIRE)--June 15, 2005--AMIS Holdings,
Inc. (Nasdaq:AMIS), parent company of AMI Semiconductor, a designer
and manufacturer of state-of-the-art integrated mixed-signal products
and structured digital products for the automotive, medical and
industrial sectors, today announced updated guidance for the second
quarter of 2005.
    "We believe second quarter revenue will come in at the high end of
our previous guidance of up two to four percent sequentially due to
strength in our target markets of automotive, medical and industrial,"
stated David Henry, senior vice president and chief financial officer,
who will be speaking today at AMI Semiconductor's analyst day in San
Francisco. "Gross margins are also expected to be at the high end of
our previous guidance of flat to up 50 basis points sequentially. We
also reiterate our previous guidance for pro forma earnings per share
of $0.12 to $0.14. We continue to evaluate a potential special tax
charge of approximately two cents per share which may result from a
revaluation of our US deferred tax assets."
    This information as well as additional information from the
analyst day meeting in San Francisco, including a web simulcast and
replay available until June 22, 2005, are available on the AMIS
Investor Relations Web site at http:www.amis.com/investor_relations.

    About AMI Semiconductor

    AMI Semiconductor (AMIS) is a leader in the design and manufacture
of silicon solutions for the real world. As a widely recognized
innovator in state-of-the-art integrated mixed-signal products,
mixed-signal foundry services and structured digital products, AMIS is
committed to providing customers with the optimal value, quickest
time-to-market semiconductor solutions. Offering unparalleled
manufacturing flexibility and dedication to customer service, AMI
Semiconductor operates globally with headquarters in Pocatello, Idaho,
European corporate offices in Oudenaarde, Belgium, and a network of
sales and design centers located in the key markets of the North
America, Europe and the Asia Pacific region.

    Forward-Looking Statements

    Statements in this press release other than statements of
historical fact are "forward-looking" statements within the meaning of
the Private Securities Litigation Reform Act of 1995. The Company's
future results could differ materially from the expectations discussed
herein. Factors that could cause or contribute to such differences
include general economic and political uncertainty, conditions in the
semiconductor industry, changes in the conditions affecting our target
markets, manufacturing underutilization, fluctuations in customer
demand, raw material costs, exchange rates, timing and success of new
products, competitive conditions in the semiconductor industry, risks
associated with international operations and the other risks and
uncertainties discussed in the Company's Form 10-K Annual Report for
the year ended Dec. 31, 2004, Form 10-Q Quarterly Reports and other
reports filed with the SEC. The Company does not intend to revise or
update any forward-looking statements to reflect events or
circumstances after the date of this press release.


    CONTACT: AMI Semiconductor, Pocatello
             Investor Relations Contact:
             Wade Olsen, 208-234-6045
             wade_olsen@amis.com
             or
             Media Relations Contact:
             Tamera Drake, 208-234-6890
             tamera_drake@amis.com