In the U.S., Grant Thornton delivers professional services through two specialized entities: Grant Thornton LLP, a licensed, certified public accounting (CPA) firm that provides audit and assurance services ― and Grant Thornton Advisors LLC (not a licensed CPA firm), which exclusively provides non-attest offerings, including tax and advisory services. Common engagements include but are not limited to co-sourced and outsourced internal audit, internal control assessments, enterprise risk management program assessments, tests of control design and operating effectiveness for Sarbanes-Oxley (SOX) and other compliance requirements, and helping clients design and implement internal controls.