Table of Contents

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-K/A

Amendment No. 1

For the fiscal year ended December 31, 2014

or

For the transition period from N/A to N/A

Commission file number: 1-10140

CVB FINANCIAL CORP.

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (909) 980-4030

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

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

None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  x    No  ¨

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes  ¨    No  x

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No  ¨

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.    x

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).    Yes  ¨    No  x

As of June 30, 2014, the aggregate market value of the common stock held by non-affiliates of the registrant was approximately $1,567,800,268.

Number of shares of common stock of the registrant outstanding as of February 17, 2015: 106,031,416.

Table of Contents

TABLE OF CONTENTS

1

Table of Contents

EXPLANATORY NOTE

This Amendment No. 1 on Form 10-K/A (“Form 10-K/A”) to our Annual Report on Form 10-K for the year ended December 31, 2014, initially filed with the Securities and Exchange Commission on March 2, 2015 (the “Original Filing”), is being filed for the sole purpose of correcting a typographical error in Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters of Part III of the Original Filing. Within the table in Item 12, the Number of Securities Remaining Available for Future Issuance Under Equity Compensation Plans was inadvertently reported as 10,821,822, when the correct number is 1,021,822. Except as stated above, this Form 10-K/A does not reflect events occurring after the Original Filing and does not modify or update in any way the disclosures contained in the Original Filing. Accordingly, this Form 10-K/A should be read in conjunction with the Original Filing.

As required by Rule 12b-15 under the Securities Exchange Act of 1934, as amended, new certifications by our principal executive officer and principal financial officer are filed as exhibits to this Form 10-K/A.

The corrected Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters table is included below:

1

Table of Contents

The following table summarizes information as of December 31, 2014 relating to our equity compensation plans pursuant to which grants of options, restricted stock, or other rights to acquire shares may be granted from time to time.

Equity Compensation Plan Information

Information concerning security ownership of certain beneficial owners and management is incorporated by reference from the sections entitled “Stock Ownership” of our definitive Proxy Statement to be filed pursuant to Regulation 14A within 120 days after the end of the last fiscal year.

2

Table of Contents

Reference is made to the Index to Financial Statements at page 86 of the Original Filing for a list of financial statements filed as part of the Annual Report on Form 10-K.

Exhibits

See Index to Exhibits of this Form 10-K/A.

3

Table of Contents

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized, on the 11th day of March 2015.

4

Table of Contents

INDEX TO EXHIBITS

5

Table of Contents

6

Table of Contents

7