Fred Alger, an investment-management firm that also had offices in the North tower, lost a collection of photographs by trendy artists such as Cindy Sherman and Hiroshi Sugimoto.

ECONOMIST: Art insurance

Alwaleed was involved in building another Kingdom Tower in Riyadh, where his Kingdom Holding Co. offices are headquartered.

FORBES: Saudi Prince Alwaleed To Build World's Tallest Tower With Binladen Group

Cantor, which occupied offices at the top of the WTC's north tower, was the most seriously affected of the businesses housed in the twin towers.

BBC: Cantor sued over twin towers rent