Form 485BPOS - Post-effective amendment [Rule 485(b)]:
SEC Accession No. 0000100334-26-000005
Filing Date
2026-02-27
Accepted
2026-02-27 10:37:59
Documents
34
Effectiveness Date
2026-03-01

Document Format Files

Seq Description Document Type Size
1 485BPOS ck0000100334-20260227.htm   iXBRL 485BPOS 6206930
2 EX-99.J AUDITORS CONSENT acmf2026ex99jdtauditorscon.htm EX-99.J 2281
8 GRAPHIC ck0000100334-20260227_g1.jpg GRAPHIC 12555
9 GRAPHIC ck0000100334-20260227_g2.jpg GRAPHIC 71384
10 GRAPHIC ck0000100334-20260227_g3.jpg GRAPHIC 73621
11 GRAPHIC ck0000100334-20260227_g4.jpg GRAPHIC 72586
12 GRAPHIC ck0000100334-20260227_g5.jpg GRAPHIC 74725
13 GRAPHIC ck0000100334-20260227_g6.jpg GRAPHIC 73651
14 GRAPHIC ck0000100334-20260227_g7.jpg GRAPHIC 73241
15 GRAPHIC ck0000100334-20260227_g8.jpg GRAPHIC 75490
16 GRAPHIC newacilogo.jpg GRAPHIC 12555
  Complete submission text file 0000100334-26-000005.txt   10802225

Data Files

Seq Description Document Type Size
3 XBRL TAXONOMY EXTENSION SCHEMA DOCUMENT ck0000100334-20260227.xsd EX-101.SCH 20993
4 XBRL TAXONOMY EXTENSION DEFINITION LINKBASE DOCUMENT ck0000100334-20260227_def.xml EX-101.DEF 43951
5 XBRL TAXONOMY EXTENSION LABEL LINKBASE DOCUMENT ck0000100334-20260227_lab.xml EX-101.LAB 84034
6 XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE DOCUMENT ck0000100334-20260227_pre.xml EX-101.PRE 151766
39 EXTRACTED XBRL INSTANCE DOCUMENT ck0000100334-20260227_htm.xml XML 724162

Series and Classes/Contracts Information:

Existing
  Status Name Ticker Symbol
CIK 0000100334      
Series S000006192   BALANCED FUND
Class/Contract C000017045   INVESTOR CLASS TWBIX
Class/Contract C000017047   I CLASS ABINX
Class/Contract C000189734   R5 CLASS ABGNX
  Status Name Ticker Symbol
CIK 0000100334      
Series S000006193   SMALL CAP GROWTH FUND
Class/Contract C000017048   I CLASS ANONX
Class/Contract C000017049   INVESTOR CLASS ANOIX
Class/Contract C000017050   A CLASS ANOAX
Class/Contract C000017052   C CLASS ANOCX
Class/Contract C000055516   R CLASS ANORX
Class/Contract C000131596   R6 CLASS ANODX
Class/Contract C000189735   R5 CLASS ANOGX
Class/Contract C000189736   Y CLASS ANOYX
Class/Contract C000212512   G Class ANOHX
  Status Name Ticker Symbol
CIK 0000100334      
Series S000006194   SELECT FUND
Class/Contract C000017053   INVESTOR CLASS TWCIX
Class/Contract C000017054   A CLASS TWCAX
Class/Contract C000017055   I CLASS TWSIX
Class/Contract C000017058   C CLASS ACSLX
Class/Contract C000017059   R CLASS ASERX
Class/Contract C000131597   R6 CLASS ASDEX
Class/Contract C000189737   R5 CLASS ASLGX
Class/Contract C000189738   Y CLASS ASLWX
Class/Contract C000247666   G Class ASLDX
  Status Name Ticker Symbol
CIK 0000100334      
Series S000006195   ULTRA FUND
Class/Contract C000017060   INVESTOR CLASS TWCUX
Class/Contract C000017061   A CLASS TWUAX
Class/Contract C000017062   I CLASS TWUIX
Class/Contract C000017063   C CLASS TWCCX
Class/Contract C000017064   R CLASS AULRX
Class/Contract C000131598   R6 CLASS AULDX
Class/Contract C000189739   R5 CLASS AULGX
Class/Contract C000189740   Y CLASS AULYX
Class/Contract C000214991   G Class AULNX
  Status Name Ticker Symbol
CIK 0000100334      
Series S000006203   LARGE CAP EQUITY FUND
Class/Contract C000017094   INVESTOR CLASS AFDIX
Class/Contract C000017095   I CLASS AFEIX
Class/Contract C000017096   A CLASS AFDAX
Class/Contract C000017098   C CLASS AFDCX
Class/Contract C000017099   R CLASS AFDRX
Class/Contract C000189741   R5 CLASS AFDGX
Class/Contract C000189742   Y CLASS AFYDX
Class/Contract C000212513   G Class AFEGX
Class/Contract C000212514   R6 Class AFEDX
  Status Name Ticker Symbol
CIK 0000100334      
Series S000006205   GROWTH FUND
Class/Contract C000017101   INVESTOR CLASS TWCGX
Class/Contract C000017102   A CLASS TCRAX
Class/Contract C000017103   I CLASS TWGIX
Class/Contract C000017105   R CLASS AGWRX
Class/Contract C000088050   C CLASS TWRCX
Class/Contract C000131599   R6 CLASS AGRDX
Class/Contract C000189743   R5 CLASS AGWUX
Class/Contract C000189744   Y CLASS AGYWX
Class/Contract C000236113   G Class ACIHX
  Status Name Ticker Symbol
CIK 0000100334      
Series S000006206   HERITAGE FUND
Class/Contract C000017106   INVESTOR CLASS TWHIX
Class/Contract C000017107   A CLASS ATHAX
Class/Contract C000017108   I CLASS ATHIX
Class/Contract C000017109   C CLASS AHGCX
Class/Contract C000055524   R CLASS ATHWX
Class/Contract C000129042   R6 CLASS ATHDX
Class/Contract C000189745   R5 CLASS ATHGX
Class/Contract C000189746   Y CLASS ATHYX
Class/Contract C000236114   G Class ACILX
Mailing Address 4500 MAIN STREET KANSAS CITY MO 64111
Business Address 4500 MAIN STREET KANSAS CITY MO 64111 816-531-5575
AMERICAN CENTURY MUTUAL FUNDS, INC. (Filer) CIK: 0000100334 (see all company filings)

EIN.: 446006315 | State of Incorp.: MD | Fiscal Year End: 1031
Type: 485BPOS | Act: 40 | File No.: 811-00816 | Film No.: 26693958

Mailing Address 4500 MAIN STREET KANSAS CITY MO 64111
Business Address 4500 MAIN STREET KANSAS CITY MO 64111 816-531-5575
AMERICAN CENTURY MUTUAL FUNDS, INC. (Filer) CIK: 0000100334 (see all company filings)

EIN.: 446006315 | State of Incorp.: MD | Fiscal Year End: 1031
Type: 485BPOS | Act: 33 | File No.: 002-14213 | Film No.: 26693957