SECURITIES AND EXCHANGE COMMISSION

Form 8-K

CURRENT REPORT
PURSUANT TO SECTION 13 OR 15(d) OF THE
SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported):
May 6, 2004

Agere Systems Inc.

Delaware
(State or other jurisdiction of incorporation)

(610) 712-1000
(Registrant’s Telephone Number)

Table of Contents

Item 7. Financial Statements and Exhibits.

     Exhibit No. Description

Item 9. Regulation FD Disclosure.

Item 12. Results of Operations and Financial Condition.

     On May 6, 2004, Agere Systems will present the slides attached hereto as Exhibit 99.1 at the JP Morgan Technology and Telecom Conference.

     The presentation contains information about our financial performance, excluding gain or loss from the sale of, and income or loss from, discontinued operations; net restructuring and other charges; purchased in-process research and development charges related to acquisitions; amortization of goodwill and acquired intangible assets; net gain or loss from the sale of operating assets and cumulative effect of an accounting change. We believe that information presented on this basis, while not a substitute for financial information prepared in accordance with generally accepted accounting principles, will allow investors to more easily compare our financial performance on an operating basis in different fiscal periods.

SIGNATURE

     Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.