|     |
|-----|
|     |  |
| [X] | ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 |

|          |
|----------|
|          |  |
| [ ] | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 |

|                                          |
|------------------------------------------|
|                                          |  |
| Nevada                                   | 87-0448736 |
| (State or other jurisdiction             | (IRS Employer |
| of incorporation or organization)        | Identification No.) |
|                                     |   |
| 2425 South Yukon, Tulsa, Oklahoma        | 74107 |
| (Address of principal executive offices) | (Zip Code) |

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|                                  |
|----------------------------------|
|                                  |  |
| Large accelerated filer [ ] | Accelerated filer [X] |
| Non-accelerated filer [ ]   | Smaller reporting company [ ] |

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|    |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|----|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 1) | Uncheck on the cover page the section that states “Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant's knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.” as the definitive proxy statement incorporated by reference in Part III of the Original Filing will include disclosure of delinquent filers. |

|    |                                                                                                                                                                                                         |
|----|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| 2) | Update the Representatives section in Part I, Item 1 of the Original Filing to state that we utilize approximately 82 independent manufacturer representatives’ organizations having 113 offices. |

|    |                                                                                                                                                 |
|----|-------------------------------------------------------------------------------------------------------------------------------------------------|
| 3) | Update the Employees section in Part I, Item 1 of the Original Filing to state that as of March 1, 2014, we employed 1,431 permanent employees. |

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|                   |
|-------------------|
|                   |  |  |  |  |
| (b) Exhibit Index |   |   |   |   |
|              |   |   |   |   |
| Exhibit Number    | Exhibit Description |
| 31.1 +            | Certification of CEO |
| 31.2 +            | Certification of CFO |
| 32.1 +            | Section 1350 Certification - CEO |
| 32.2 +            | Section 1350 Certification - CFO |
|              |   |   |   |   |
| + Filed herewith  |   |   |   |   |

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|        |
|--------|
|        |  |  |  |
|   |   | AAON, INC. |
|   |   |   |   |
| Dated: | March 27, 2014 | By:  | /s/ Norman H. Asbjornson  |
|   |   |   | Norman H. Asbjornson, President |