Company: CVBF
Filing Date: 2025-08-04
Form Type: 8-K/A
Source: 0001193125-25-172715
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Company: CVB FINANCIAL CORP
Filing Date: 2025-08-04
Form: 8-K/A
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A (Amendment No. 1) Current Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 23, 2025 CVB FINANCIAL CORP. (Exact name of registrant as specified in its charter)

| California                                                     |     | 000-10140               |     | 95-3629339                             |
| (State or other jurisdiction of incorporation or organization) |     | -Commission file number |     | -I.R.S. employer identification number |

| 701 North Haven Avenue, Ontario, California |     |     91764 |
| (Address of principal executive offices)    |     | -Zip Code |

Registrant’s telephone number, including area code: (909) 980-4030 Not Applicable (Former name or former address, if changed since last report) Check the appropriate box below if the Form 8-Kfiling is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (See General Instruction A.2. below):

| ☐ | Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) |

| ☐ | Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) |

| ☐ | Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) |

| ☐ | Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) |

Securities registered pursuant to Section 12(b) of the Act:

| Title of each class        |     | Trading   
 Symbol(s) |     | Name of each exchange        
 on which registered          |
| Common Stock, No Par Value |     | CVBF      |     | The Nasdaq Stock Market, LLC |

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2of the Securities Exchange Act of 1934 (§240.12b-2of this chapter). Emerging growth