Which act requires financial service companies to provide a written privacy policy to customers?

The Gramm-Leach-Bliley Act is the legislation that mandates financial institutions to provide a written privacy policy to their customers. This act was enacted to ensure that consumers’ personal financial information is protected and that they are informed about how their data will be used and shared.

Under the provisions of the Gramm-Leach-Bliley Act, financial institutions must clearly disclose their privacy policies at the beginning of the customer relationship and annually thereafter. This requirement aims to promote transparency and give consumers a better understanding of the company's data practices, fostering trust in financial service providers.

In contrast, the National Banking Act primarily focuses on the regulation of national banks and their operations, while the Dodd-Frank Act deals with the overall reform of financial markets and consumer protection, and the Sarbanes-Oxley Act emphasizes corporate governance and financial disclosures rather than privacy policies.