Cantor Fitzgerald and its affiliate BGC Partners are donating 100 per cent of their revenues from Wednesday's event to dozens of charities. Those include the Children's Health Fund, the Christopher and Dana Reeve Foundation, and the Alliance for Lupus Research.
Julianne Moore, Billy Crystal, Brooklyn Nets coach Jason Kidd and other celebrities joined Cantor brokers as they made transactions.
Cantor's charity day raised $12 million last year.
Cantor Fitzgerald suffered the greatest loss of any single company in the terror attacks. The firm's death toll represented two-thirds of its global workforce.