The Singapore government owns two investment companies, GIC Private Limited and Temasek Holdings, which manage Singapore's reserves. Both operate as commercial investment holding companies independently of the Singapore government, but Prime Minister Lee Hsien Loong and his wife Ho Ching serve as chairman and CEO of these corporations respectively. While GIC invests abroad, Temasek holds 31% of its portfolio in Singapore, holding majority stakes in several of the nation's largest companies, such as Singapore Airlines, SingTel, ST Engineering and MediaCorp. As of 2014, Temasek holds S$69 billion of assets in Singapore, accounting for 7% of the total capitalisation of Singapore-listed companies.