The nine men are charged with manipulating the Egyptian Stock Exchange, al-Masry al-Youm reported.
The South Cairo Criminal Court decided on the adjournment to allow time for experts to determine the profit Gamal Mubarak made by selling Egypt's al-Watany Bank.
Gamal, his brother Alaa and seven other Egyptian businessmen are accused of gaining more than $328 million from the sale.
Assistant Prosecutor Adel al-Saeed said the defendants made a profit by manipulating the stock exchange.
They are accused of concealing their identities during bank share dealings through cluster companies and closed investment funds in Cyprus and the British Isles, and transferring their profits abroad.
2014: NFL Cheerleaders [PHOTOS]
U.N. investigator: prosecute North Korea