The investment manager Amvescap PLC of London announced Thursday that Robert H. Graham has stepped down as vice chairman of the board of directors and retired.
Mr. Graham, 60, was a founder of AIM Investments, which was started in 1976 and merged with Invesco in 1997 to form Amvescap. He had been a director of Amvescap since 1997 and vice chairman of the board since 2001.
A spokesman would not say whether the company was seeking a successor. Amvescap had $465.1 billion of assets under management as of Feb. 28.
