Prime Minister Theresa May met the boss of Saudi Aramco earlier this year.
During a trip to Saudi Arabia in April, Mrs May held talks with chairman Khalid Al-Falih, who is also Saudi Arabia’s energy minister.
She was joined at the meeting by Xavier Rolet, chief executive of the London Stock Exchange.
The Financial Conduct Authority (FCA), the UK City watchdog, is currently consulting on whether to create a new category for sovereign-controlled companies who wish to list on the London Stock Exchange.
The proposal has prompted questions from both the Commons Treasury Select Committee and the Business, Energy and Industrial Strategy Committee over whether the FCA was politically influenced to alter the rules to help lure Saudi Aramco to London.