X0101 EFFECT 33 LIVE 2007-04-03 16:00:00

N-14

0000100334 AMERICAN CENTURY MUTUAL FUNDS, INC. 333-140907 0000100334 AMERICAN CENTURY MUTUAL FUNDS, INC. S000006192 BALANCED FUND C000017045 INVESTOR CLASS 0000100334 AMERICAN CENTURY MUTUAL FUNDS, INC. S000006192 BALANCED FUND C000017046 ADVISOR CLASS 0000100334 AMERICAN CENTURY MUTUAL FUNDS, INC. S000006194 SELECT FUND C000017054 ADVISOR CLASS 0000100334 AMERICAN CENTURY MUTUAL FUNDS, INC. S000006194 SELECT FUND C000017056 A CLASS 0000100334 AMERICAN CENTURY MUTUAL FUNDS, INC. S000006197 VISTA FUND C000017068 ADVISOR CLASS 0000100334 AMERICAN CENTURY MUTUAL FUNDS, INC. S000006197 VISTA FUND C000017070 C CLASS 0000100334 AMERICAN CENTURY MUTUAL FUNDS, INC. S000006205 GROWTH FUND C000017102 ADVISOR CLASS 0000100334 AMERICAN CENTURY MUTUAL FUNDS, INC. S000006205 GROWTH FUND C000017104 C CLASS