[united]

According to Wikipedia he has a few other minor assets as well:
http://en.wikipedia.org/wiki/Al-Waleed_bin_Talal

Al-Walid now owns the yacht Kingdom 5KR, which is the 85.9-meter (282-foot) yacht originally built as the "Nabila" for Saudi billionaire, Adnan Khashoggi. She subsequently posed as the Flying Saucer, the yacht of James Bond villain Largo in the film Never Say Never Again. The yacht was later sold to Donald Trump, who renamed it Trump Princess. Al-Walid bought the yacht after Trump's second bankruptcy.[7]

He has ordered a new yacht currently known as the New Kingdom 5KR which will be about 170 meters (557 feet) long and will cost $500+ million. The yacht is rendered by Lindsay Designs and is expected to be delivered in 2009.[8]
He owns 300 cars and has been rumored to own a diamond-covered Mercedes SL600 worth an estimated $4.8 million. This, however, is a popular hoax email that has been circulating the internet since 2006 in different forms.[9]
At the 2007 Dubai Airshow, Airbus confirmed that Al-Walid, already owner of a Boeing 747 jet converted to private use, had ordered an Airbus A380, the world's largest passenger aircraft. Outfitted for private use, the aircraft is to be delivered in 2010.[10][11] This has been noted in the 2009 Guiness World Records as the largest private jet in the world.
Al-Waleed and his children live in a $100 million sand-colored palace whose 317 rooms are adorned with 1,500 tons of Italian marble, silk oriental carpets, gold-plated faucets and 250 TV sets. It has four kitchens, for Arabic, Continental and Asian cuisines, and a fifth just for dishing up desserts, run by chefs who can feed 2,000 people on an hour's notice. Their royal highnesses can swim in a lagoon-shaped pool, or catch a film in the 45-seat basement cinema.