Birmingham City shares have been suspended on the London stock exchange this morning.
Brady, 39, and the 59-year-old Sullivan were questioned and bailed by officers from City of London's economic crime unit, who raided the club's offices last month.
A short statement issued by the stock exchange's "Aim" index read: "At the request of the company trading on Aim for the under-mentioned securities has been temporarily suspended from 7.30am, pending an announcement." Shares in the company had been selling for 35.5p until the suspension announcement which came half an hour before the start of trading.