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):
April 27, 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, Pro Forma Financial Information and Exhibits

(c) Exhibits.

Item 12. Results of Operations and Financial Condition

     On April 27, 2004, Agere Systems issued a news release announcing its financial results for the quarter ended March 31, 2004. A copy of that news release is attached to this report as Exhibit 99.1.

     The news release contains information about our net income, 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 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.