Company: CIO
Filing Date: 2025-05-16
Form Type: S-8
Source: 0001193125-25-121681
Chunk: 0

Company: City Office REIT, Inc.
Filing Date: 2025-05-16
Form: S-8
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As filed with the Securities and Exchange Commission on May 16, 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 City Office REIT, Inc. (Exact name of registrant as specified in its charter)

| Maryland                        |     | 98-1141883         |
| (State or other jurisdiction of 
 incorporation or organization)  |     | -I.R.S. Employer   
 Identification No. |

666 Burrard Street, Suite 3210 Vancouver, British Columbia V6C 2X8 (Address of Principal Executive Offices) Equity Incentive Plan (Full Title of the Plan) Anthony Maretic Chief Financial Officer City Office REIT, Inc. 666 Burrard Street Suite 3210 Vancouver, British Columbia V6C 2X8 Tel: (604) 806-3366 (Name, Address and Telephone Number, Including Area Code, of Agent For Service) Copy to: James V. Davidson, Esq. Hogan Lovells US LLP 609 Main Street Suite 4200 Houston, Texas 77002 Telephone: (713) 632-1478 Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-acceleratedfiler, a smaller reporting company, or an emerging growth company. See definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2of the Exchange Act.

| 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. ☐

EXPLANATORY NOTE This registration statement on Form S-8(the “Registration Statement”) is filed by City Office REIT, Inc. (the “Registrant”) relating to 2,000,000 shares of the Registrant’s common stock