Company: HCKT
Filing Date: 2025-08-06
Form Type: S-8
Source: 0001193125-25-174585
Chunk: 0

Company: HACKETT GROUP, INC.
Filing Date: 2025-08-06
Form: S-8
Chunk 0
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As filed with the Securities and Exchange Commission on August 6, 2025 Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 THE HACKETT GROUP, INC. (Exact name of registrant as specified in its charter)

| Florida                           |     | 65-0750100         |
| (State or other jurisdiction      
 of incorporation or organization) |     | -I.R.S. Employer   
 Identification No. |

1001 Brickell Bay Drive Suite 3000 Miami, Florida 33131 (305) 375-8005 (Address of principal executive offices) The Hackett Group, Inc. 1998 Stock Option and Incentive Plan (Amended and Restated as of February 13, 2025) (Full title of the plan) Frank A. Zomerfeld, Esq. Executive Vice President, General Counsel and Secretary 1001 Brickell Bay Drive Suite 3000 Miami, Florida 33131 (305) 375-8005 (Name, address and telephone number, including area code, of agent for service) Copies to: John B. Beckman Hogan Lovells US L.L.P. 555 Thirteenth Street, N.W. Washington, DC 20004 (202) 637-5600 Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer,a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 ofthe Exchange Act. (Check one):

| Large accelerated filer |     | ☐ |     | Accelerated filer         |     | ☒ |
| Non-accelerated filer   |     | ☐ |     | Smaller reporting company |     | ☐ |
| Emerging growth company |     | ☐ |     |                           |     |   |

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. ☐

PART I

EXPLANATORY STATEMENT

This Registration
Statement on Form