CERTIFICATIONS
EX-99.CERT
I, Jonathan S. Thomas, certify that:
| 1. | I have reviewed this report on Form N-CSR of American Century Mutual Funds, Inc.; | |
| 2. | Based on my knowledge, this report does not contain any untrue statement of a material fact or | |
| omit to state a material fact necessary to make the statements made, in light of the circumstances | ||
| under which such statements were made, not misleading with respect to the period covered by | ||
| this report; | ||
| 3. | Based on my knowledge, the financial statements, and other financial information included in this | |
| report, fairly present in all material respects the financial condition, results of operations, changes | ||
| in net assets, and cash flows (if the financial statements are required to include a statement of | ||
| cash flows) of the registrant as of, and for, the periods presented in this report; | ||
| 4. | The registrant's other certifying officer and I are responsible for establishing and maintaining | |
| disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company | ||
| Act of 1940) and internal control over financial reporting (as defined in Rule 30a-3(d) under the | ||
| Investment Company Act of 1940) for the registrant and have: | ||
| (a) | Designed such disclosure controls and procedures, or caused such disclosure controls and | |
| procedures to be designed under our supervision, to ensure that material information | ||
| relating to the registrant, including its consolidated subsidiaries, is made known to us by | ||
| others within those entities, particularly during the period in which this report is being | ||
| prepared; | ||
| (b) | Designed such internal control over financial reporting, or caused such internal control | |
| over financial reporting to be designed under our supervision, to provide reasonable | ||
| assurance regarding the reliability of financial reporting and the preparation of financial | ||
| statements for external purposes in accordance with generally accepted accounting | ||
| principles; | ||
| (c) | Evaluated the effectiveness of the registrant's disclosure controls and procedures and | |
| presented in this report our conclusions about the effectiveness of the disclosure controls | ||
| and procedures, as of a date within 90 days prior to the filing date of this report based on | ||
| such evaluation; and | ||
| (d) | Disclosed in this report any change in the registrant's internal control over financial | |
| reporting that occurred during the second fiscal quarter of the period covered by this | ||
| report that has materially affected, or is reasonably likely to materially affect, the | ||
| registrant's internal control over financial reporting; and | ||
| 5. | The registrant's other certifying officer and I have disclosed to the registrant's auditors and the | |
| audit committee of the registrant's board of directors (or persons performing the equivalent | ||
| functions): | ||
| (a) | All significant deficiencies and material weaknesses in the design or operation of internal | |
| control over financial reporting which are reasonably likely to adversely affect the | ||
| registrant's ability to record, process, summarize, and report financial information; and | ||
| (b) | Any fraud, whether or not material, that involves management or other employees who | |
| have a significant role in the registrant's internal control over financial reporting. |
| Date: | December 30, 2009 |
| /s/ Jonathan S. Thomas |
| Jonathan S. Thomas |
| President |
| (principal executive officer) |
I, Robert J. Leach, certify that:
| 1. | I have reviewed this report on Form N-CSR of American Century Mutual Funds, Inc.; | |
| 2. | Based on my knowledge, this report does not contain any untrue statement of a material fact or | |
| omit to state a material fact necessary to make the statements made, in light of the circumstances | ||
| under which such statements were made, not misleading with respect to the period covered by | ||
| this report; | ||
| 3. | Based on my knowledge, the financial statements, and other financial information included in this | |
| report, fairly present in all material respects the financial condition, results of operations, changes | ||
| in net assets, and cash flows (if the financial statements are required to include a statement of | ||
| cash flows) of the registrant as of, and for, the periods presented in this report; | ||
| 4. | The registrant's other certifying officer and I are responsible for establishing and maintaining | |
| disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company | ||
| Act of 1940) and internal control over financial reporting (as defined in Rule 30a-3(d) under the | ||
| Investment Company Act of 1940) for the registrant and have: | ||
| (a) | Designed such disclosure controls and procedures, or caused such disclosure controls and | |
| procedures to be designed under our supervision, to ensure that material information | ||
| relating to the registrant, including its consolidated subsidiaries, is made known to us by | ||
| others within those entities, particularly during the period in which this report is being | ||
| prepared; | ||
| (b) | Designed such internal control over financial reporting, or caused such internal control | |
| over financial reporting to be designed under our supervision, to provide reasonable | ||
| assurance regarding the reliability of financial reporting and the preparation of financial | ||
| statements for external purposes in accordance with generally accepted accounting | ||
| principles; | ||
| (c) | Evaluated the effectiveness of the registrant's disclosure controls and procedures and | |
| presented in this report our conclusions about the effectiveness of the disclosure controls | ||
| and procedures, as of a date within 90 days prior to the filing date of this report based on | ||
| such evaluation; and | ||
| (d) | Disclosed in this report any change in the registrant's internal control over financial | |
| reporting that occurred during the second fiscal quarter of the period covered by this | ||
| report that has materially affected, or is reasonably likely to materially affect, the | ||
| registrant's internal control over financial reporting; and | ||
| 5. | The registrant's other certifying officer and I have disclosed to the registrant's auditors and the | |
| audit committee of the registrant's board of directors (or persons performing the equivalent | ||
| functions): | ||
| (a) | All significant deficiencies and material weaknesses in the design or operation of internal | |
| control over financial reporting which are reasonably likely to adversely affect the | ||
| registrant's ability to record, process, summarize, and report financial information; and | ||
| (b) | Any fraud, whether or not material, that involves management or other employees who | |
| have a significant role in the registrant's internal control over financial reporting. |
| Date: | December 30, 2009 |
| /s/ Robert J. Leach |
| Robert J. Leach |
| Vice President, Treasurer, and |
| Chief Financial Officer |
| (principal financial officer) |