Until the attacks, Cantor had handled about a quarter of the daily transactions in the multitrillion-dollar treasury security market. Cantor Fitzgerald has since rebuilt its infrastructure, partly by the efforts of its London office, and it now has its headquarters in Midtown Manhattan. The company's effort to regain its footing was the subject of Tom Barbash's 2003 book "On Top of the World: Cantor Fitzgerald, Howard Lutnick, and 9/11: A Story of Loss and Renewal" as well as a 2012 documentary, "Out of the Clear Blue Sky".