Form 8-A12B CAPITAL ONE FINANCIAL

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 8-A

FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES

PURSUANT TO SECTION 12(b) OR 12(g) OF

THE SECURITIES EXCHANGE ACT OF 1934

Capital One Financial Corporation

(Exact name of registrant as specified in its charter)

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

If this form relates to the registration of a class of securities pursuant to Section 12(b) of the Exchange Act and is effective pursuant to General Instruction A.(c) or (e), check the following box. ☒

If this form relates to the registration of a class of securities pursuant to Section 12(g) of the Exchange Act and is effective pursuant to General Instruction A.(d) or (e), check the following box. ☐

If this form relates to the registration of a class of securities concurrently with a Regulation A offering, check the following box. ☐

Securities Act registration statement or Regulation A offering statement file number to which this form relates:

333-277813

(if applicable)

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

None

(Title of Class)

INFORMATION REQUIRED IN REGISTRATION STATEMENT

Item 1. Description of Registrant’s Securities to be Registered.

The securities to be registered hereby are €750,000,000 aggregate principal amount of 4.326% Fixed-to-Floating Rate Senior Notes due 2032 (the “2032 Fixed-to-Floating Rate Notes”) and €750,000,000 aggregate principal amount of 4.832% Fixed-to-Floating Rate Senior Notes due 2037 (the “2037 Fixed-to-Floating Rate Notes” and, together with the 2032 Fixed-to-Floating Rate Notes, the “Notes”) of Capital One Financial Corporation (the “Company”). The descriptions set forth under the section “Description of the Notes” in the prospectus supplement dated September 9, 2026, as filed with the Securities and Exchange Commission (the “Commission”) on September 10, 2026 pursuant to Rule 424(b) under the Securities Act of 1933, as amended, to the prospectus (the “Base Prospectus”) included in the Company’s automatic shelf registration statement on Form S-3 (No. 333-277813), as filed with the Commission on March 11, 2024, and the descriptions set forth under the section “Description of Debt Securities” of the Base Prospectus are incorporated herein by reference.

Item 2. Exhibits.

The following exhibits are filed as a part of this Registration Statement:

SIGNATURE

Pursuant to the requirements of Section 12 of the Securities Exchange Act of 1934, the registrant has duly caused this registration statement to be signed on its behalf by the undersigned, thereto duly authorized.