Sir Richard Branson has halted talks over $1bn Saudi investment in Virgin space firms after the disappearance of Saudi journalist Jamal Khashoggi, BBC reports.
Sir Richard has also suspended directorships in two tourism projects.
Mr Khashoggi, a noted critic of the Saudi government, disappeared when visiting the Saudi consulate in Istanbul last week.
Turkish police have evidence that supports that Mr Khashoggi was killed, the Washington Post reported.
"What has reportedly happened in Turkey around the disappearance of journalist Jamal Khashoggi, if proved true, would clearly change the ability of any of us in the West to do business with the Saudi Government," Sir Richard said in a statement.
"We have asked for more information from the authorities in Saudi and to clarify their position in relation to Mr Khashoggi."