Taizo Son (孫泰蔵 손태장, born September 29, 1972) is a Japanese businessman. He is CEO of Mistletoe, a company that he founded in 2013, and chairman of mobile gaming company GungHo, which he founded in 2002. The company's market value in 2013 was $10.4 billion and this has made him a billionaire. He is the youngest brother of SoftBank magnate Masayoshi Son.