
According to reports, Delta Topco issued 90.7 million new shares in 2008, bringing its total shares to one billion. Sorrell and Brabeck are now believed to have a 0.3% stake in the company.
As private equity firm CVC bought Formula One for $2bn in 2006, Sorrell's stake is reported to be worth $6m. Sorrell and Brabeck, non-executive directors of Formula One, are said to have bought their shares for a "nominal price" of $27,000.
WPP declined to comment.