Citadel and Reddit Executives Expected at GameStop Hearing (The New York Times) Kenneth C. Griffin, the billionaire hedge fund manager, may be among the executives who testify at next week’s Congressional hearing about the recent madcap trading in shares of GameStop that bruised many big investors, a person with knowledge of the matter said. Mr. Griffin’s firm, Citadel, was a central player in the GameStop drama both because of its investments and the role of its sister company, Citadel Securities, as a market maker in stocks. It was asked to make an executive available for the Feb. 18 hearing scheduled by the House Financial Services Committee, this person said, but the company is still waiting to hear whether the committee will call Mr. Griffin or another executive.