COF: 8-K company filing

8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 September 1, 2026 Date of Report (Date of earliest event reported) CAPITAL ONE FINANCIAL CORPORATION (Exact name of registrant as specified in its charter) Delaware 001-13300 54-1719854 (State or other jurisdiction of incorporation) (Commission File Number) (IRS Employer Identification No.) 1680 Capital One Drive , McLean , Virginia 22102 (Address of principal executive offices) (Zip Code) Registrant’s telephone number, including area code: (703) 720-1000 (Not applicable) (Former name or former address, if changed since last report) Check the appropriate box below if the Form 8-K filing 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 (par value $.01 per share) COF New York Stock Exchange Depositary Shares, Each Representing a 1/40th Interest in a Share of Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series I COF PRI New York Stock Exchange Depositary Shares, Each Representing a 1/40th Interest in a Share of Fixed Rate Non-Cumulative Perpetual Preferred Stock, S