Company: CIO
Filing Date: 2025-08-15
Form Type: DEFA14A
Source: 0001193125-25-181889
Chunk: 5

Company: City Office REIT, Inc.
Filing Date: 2025-08-15
Form: DEFA14A
Chunk 5
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 10-Kunder the heading “Risk Factors” and in the Company’s subsequent reports filed with the SEC, many of which are beyond the Company’s control. Should one or more of these risks or uncertainties materialize, or should any of the Company’s assumptions prove to be incorrect, the Company’s actual results may vary in material respects from what it may have expressed or implied by these forward-lookingstatements. The Company cautions that you should not place undue reliance on any of its forward-looking statements. Any forward-looking statement made by the Company in this Current Report speaks only as of the date of this Current Report. Factors or events that could cause the Company’s actual results to differ may emerge from time to time, and it is not possible for the Company to predict all of them. The Company does not guarantee that the assumptions underlying such forward-looking statements contained in this press release are free from errors. The Company undertakes no obligation to publicly update any forward-looking statement, whether as a result of new information, future developments or otherwise, except as may be required by applicable securities laws.

| Item 9.01 | Financial Statements and Exhibits. |

| 99.1 
 99.2 |     | Unaudited Pro Forma Consolidated Balance Sheet as of June 30, 2025                                        
 Unaudited Pro Forma Consolidated Statement of Operations for the Six Months Ended June 30, 2025           
 Unaudited Pro Forma Consolidated Statement of Comprehensive Income for the Six Months Ended June 30, 2025 
 Unaudited Pro Forma Consolidated Statement of Operations for the Year Ended December 31, 2024             
 Unaudited Pro Forma Consolidated Statement of Comprehensive Income for the Year Ended December 31, 2024   
 Notes to Unaudited Pro Forma Consolidated Financial Statements                                            
 Press Release, dated August 15, 2025, issued by City Office REIT, Inc.                                    |
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| 104  |     | Cover Page Interactive Data File (embedded within the Inline XBRL Document).                              |

SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

| Date: August 15, 2025 |     | By: |     | CITY OFFICE REIT, INC.                                    
 /s/ Anthony Maretic                                       |
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