CAPITAL ONE FINANCIAL CORP

The level and composition of our capital are determined by multiple factors, including our consolidated regulatory capital requirements as described in more detail below and internal risk-based capital assessments such as internal stress testing. The level and composition of our capital may also be influenced by rating agency guidelines, subsidiary capital requirements, business environment, conditions in the financial markets and assessments of potential future losses due to adverse changes in our business and market environments.

Capital Standards and Prompt Corrective Action

The Company and the Bank are subject to the regulatory capital requirements established by the Federal Reserve and the OCC, respectively (the “Basel III Capital Rules”). The Basel III Capital Rules implement certain capital requirements published by the Basel Committee on Banking Supervision (“Basel Committee”), along with certain provisions of the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010 (“Dodd-Frank Act”) and other capital provisions.

As a bank holding company (“BHC”) with total consolidated assets of at least $250 billion but less than $700 billion and not exceeding any of the applicable risk-based thresholds, the Company is a Category III institution under the Basel III Capital Rules.

The Bank, as a subsidiary of a Category III institution, is a Category III bank. Moreover, the Bank, as an insured depository institution, is subject to prompt corrective action (“PCA”) capital regulations.

Basel III and U.S. Capital Rules

Under the Basel III Capital Rules, we must maintain a minimum CET1 capital ratio of 4.5%, a Tier 1 capital ratio of 6.0% and a total capital ratio of 8.0%, in each case in relation to risk-weighted assets. In addition, we must maintain a minimum leverage ratio of 4.0% and a minimum supplementary leverage ratio of 3.0%. We are also subject to the capital conservation buffer requirement and countercyclical capital buffer requirement, each as described below. Our capital and leverage ratios are calculated based on the Basel III standardized approach framework.

We have elected to exclude certain elements of accumulated other comprehensive income (“AOCI”) from our regulatory capital as permitted for a Category III institution. For information on the recognition of AOCI in regulatory capital under the proposed changes to the Basel III Capital Rules, see “Part I—Item 1. Business—Supervision and Regulation—Prudential Regulation of Banking—Capital and Stress Testing Regulation—Basel III Finalization Proposal” in our 2024 Form 10-K.

Global systemically important banks (“G-SIBs”) that are based in the U.S. are subject to an additional CET1 capital requirement known as the “G-SIB Surcharge.” We are not a G-SIB based on the most recent available data and thus we are not subject to a G-SIB Surcharge.

Stress Capital Buffer Rule

The Basel III Capital Rules require banking institutions to maintain a capital conservation buffer, composed of CET1 capital, above the regulatory minimum ratios. Under the Federal Reserve’s final rule to implement the stress capital buffer requirement (“Stress Capital Buffer Rule”), the Company’s “standardized approach capital conservation buffer” includes its stress capital buffer requirement (as described below), any G-SIB Surcharge (which is not applicable to us) and the countercyclical capital buffer requirement (which is currently set at 0%). Any determination to increase the countercyclical capital buffer generally would be effective twelve months after the announcement of such an increase, unless the Federal Reserve sets an earlier effective date.

The Company’s stress capital buffer requirement is recalibrated every year based on the Company’s supervisory stress test results. In particular, the Company’s stress capital buffer requirement equals, subject to a floor of 2.5%, the sum of (i) the difference between the Company’s starting CET1 capital ratio and its lowest projected CET1 capital ratio under the severely adverse scenario of the Federal Reserve’s supervisory stress test plus (ii) the ratio of the Company’s projected four quarters of common stock dividends (for the fourth to seventh quarters of the planning horizon) to the projected risk-weighted assets for the quarter in which the Company’s projected CET1 capital ratio reaches its minimum under the supervisory stress test.

Based on the Company’s 2024 supervisory stress test results, the Company’s stress capital buffer requirement for the period beginning on October 1, 2024 through September 30, 2025 was 5.5%. Therefore, the Company’s minimum capital requirements

plus the standardized approach capital conservation buffer for CET1 capital, Tier 1 capital and total capital ratios under the stress capital buffer framework were 10.0%, 11.5% and 13.5%, respectively, for the period from October 1, 2024 through September 30, 2025.

Based on the Company’s 2025 supervisory stress test results, the Company’s final stress capital buffer requirement for the period beginning on October 1, 2025 through September 30, 2026 is 4.5%. Therefore, the Company’s minimum capital requirements plus the standardized approach capital conservation buffer for CET1 capital, Tier 1 capital and total capital ratios under the stress capital buffer framework are 9.0%, 10.5% and 12.5%, respectively, for the period from October 1, 2025 through September 30, 2026. For additional information regarding a proposed rulemaking to modify the stress capital buffer framework, including the recalibration and annual effective date of the stress capital buffer requirement, see “Part I—Item 2. MD&A—Supervision and Regulation” in our Q2 2025 Form 10-Q.

The Stress Capital Buffer Rule does not apply to the Bank. Pursuant to the OCC’s capital regulations, which are only applicable to the Bank, the capital conservation buffer for the Bank continues to be fixed at 2.5%. Therefore, the Bank’s minimum capital requirements plus its capital conservation buffer for CET1 capital, Tier 1 capital and total capital ratios are 7.0%, 8.5% and 10.5%, respectively.

If the Company or the Bank fails to maintain its capital ratios above the minimum capital requirements plus the applicable capital conservation buffers, it will face increasingly strict automatic limitations on capital distributions and discretionary bonus payments to certain executive officers.

As of September 30, 2025 and December 31, 2024, respectively, the Company and the Bank each exceeded the minimum capital requirements and the capital conservation buffer requirements applicable to them, and the Company and the Bank were each “well-capitalized.” The “well-capitalized” standards applicable to the Company are established in the Federal Reserve’s regulations, and the “well-capitalized” standards applicable to the Bank are established in the OCC’s PCA capital requirements.

Market Risk Rule

The “Market Risk Rule” supplements the Basel III Capital Rules by requiring institutions subject to the rule to adjust their risk-based capital ratios to reflect the market risk in their trading book. The Market Risk Rule generally applies to institutions with aggregate trading assets and liabilities equal to 10% or more of total assets or $1 billion or more. As of September 30, 2025, the Company and the Bank are subject to the Market Risk Rule. See “Market Risk Profile” below for additional information.

For the description of the regulatory capital rules to which we are subject, including recent proposed amendments to these rules under the Basel III Finalization Proposal, see “Part I—Item 1. Business—Supervision and Regulation” in our 2024 Form 10-K.