The US Securities and Exchange Commission (SEC) said commissioner Kathleen Casey will leave the regulator having completed her five-year term on 5 June.
“I feel fortunate to have served on the commission during such a critical time and alongside such talented, hardworking and dedicated professionals,” Casey said in a statement.
Casey recently announced her support for US companies to be allowed to report under IFRS and called for the country to move towards IFRS adoption.
Casey was one of the five commissioners appointed to the regulator by the previous President, George Bush.
The nominations committee is still currently considering who will take over her Republican seat at the SEC but someone is expected to be announced in the coming months.