Company: HCKT
Filing Date: 2025-11-05
Form Type: SC TO-I
Source: 0001193125-25-267274
Chunk: 4

Company: HACKETT GROUP, INC.
Filing Date: 2025-11-05
Form: SC TO-I
Chunk 4
---
 to the Company’s Form 8-K dated September 16, 2024). |
| (g)     |     | Not applicable.                                                                                                                                     |
| (h)     |     | Not applicable.                                                                                                                                     |
| 107     |     | Calculation of Filing Fee Table.                                                                                                                    |

| ITEM 13. | INFORMATION REQUIRED BY SCHEDULE 13E-3 |

Not applicable. 6

SIGNATURES After due inquiry and to the best of my knowledge and belief, I certify that the information set forth in this Schedule TO is true, complete and correct.

| Dated: November 5, 2025 |     | The Hackett Group, Inc. 
 By:                     |     | /s/ Ted A. Fernandez                              |
|:------------------------|:----|:------------------------|:----|:--------------------------------------------------|
|                         |     | Name:                   |     | Ted A. Fernandez                                  |
|                         |     | Title:                  |     | Chief Executive Officer and Chairman of the Board |

7