Houston-based Vaalco Energy announced on 16 September that it was seeking a listing on the main market of the London Stock Exchange to complement its existing New York Stock Exchange listing. Its shares are expected to start trading in London on 26 September. Vaalco operates the producing Etame Marin Block in Gabon and has a stake in Block P in Equatorial Guinea. A number of US-based companies have sought London listings to access the market’s expertise in understanding the African oil industry. Africa Oil Corporation opened a London office earlier this month.