Saudi Binladin Group, known as Binladin Group Global Holding Company since 2019, is a multinational construction conglomerate headquartered in Jeddah, Saudi Arabia. In 2011, the Saudi Binladin Group signed a US$1.23 billion contractual agreement to construct the tallest building in the world, Jeddah Tower in Jeddah. They are also party to a US$3.4 billion agreement to construct the Doha Metro located in Doha. The conglomerate comprises an estimated 537 companies. The group's founder was business magnate Muhammad bin Ladin. Muhammad bin Ladin is the father of Osama bin Laden—the founder and first leader of al-Qaeda—who was most known for planning the September 11 attacks in the United States in 2001.