7) Tamim bin Hamad Al Thani, Emir of Qatar – $2 Billion

Tamim bin Hamad is the youngest reigning monarch in the world. He became the Emir of Qatar after his father abdicated the throne in 2013. He heads the Qatar Investment Authority board of investors. The fund has invested billions in businesses in the UK. He holds large stakes in Sainsbury’s Barclay’s Bank and Harrods. His fund also owns a share of the Shard, Europe’s tallest building.