EXHIBIT 99.906CERT
Certification Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
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In connection with the shareholder report of American Century Mutual Funds,
Inc. (the "Registrant") on Form N-CSR for the period ending April 30, 2004 (the
"Report"), we, the undersigned, certify, pursuant to Section 906 of the
Sarbanes-Oxley Act of 2002, that:
(1) The Report fully complies with the requirements of Section 15(d) of
the Securities Exchange Act of 1934; and
(2) The information contained in the Report fairly presents, in all
material respects, the financial condition and results of operations
of the Registrant.
Dated: June 21, 2004
/s/ William M. Lyons
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William M. Lyons
President
(chief executive officer)
/s/ Maryanne L. Roepke
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Maryanne L. Roepke
Sr. Vice President, Treasurer, and
Chief Accounting Officer
(chief financial officer)
American Century Ultra Fund - I Class (TWUIX)
Filed: 30 Jun 04, 12:00am