Cairo ( CNN ) -- Two sons of ousted Egyptian president Hosni Mubarak stood trial Monday in a Cairo criminal court on charges of insider stock trading , with prosecutors alleging they acquired millions illegally by using insider information about a bank sale . Gamal and Alaa Mubarak allegedly gained the money through the 2007 sale of the Al Watany Bank of Egypt . They stood trial with seven others , including the deputy chief executives of the bank . Prosecutors told the court the defendants conspired to acquire illegal funds and 80 % of the bank 's shares . Gamal Mubarak illegally made nearly 500 million Egyptian pounds , or about $ 82 million , from the bank sale , prosecutors said . His brother , Alaa , used insider information about the bank to gain 12 million Egyptian pounds , or about $ 1.9 million , authorities allege . The two `` purposely withheld vital information on the sale of the bank from other share traders to implement their crime and violated the principles of transparency and equality between traders , '' according to a statement from prosecutors . They are further accused of selling their shares to strategic partners at EFG Hermes . Yasser El-Malawny and Hassan Heikal , EFG Hermes joint chief executive officers , are among the other defendants in the case . Following Monday 's proceedings , the trial was adjourned until September 8 . The court denied a request by the Mubaraks ' attorneys that they be released on bail . The attorneys had pointed out that the other seven defendants were freed on bail , but not allowed to travel . The travel ban remains in place , the court ruled . All nine of the defendants , including the Mubaraks , deny the charges . Gamal Mubarak told the judge there was `` no basis whatsoever to these accusations . '' `` Unfortunately , these are all lies , '' Alaa Mubarak said . `` None of this happened . '' Gamal and Alaa Mubarak have been imprisoned since spring 2011 . They were acquitted of corruption charges in another case last month . EFG Hermes is one of the Middle East 's most prominent investment companies , with branches in nine Arab countries . Hermes released a statement last May saying its two executives acted properly in the acquisition of the Al Watany bank . The National Bank of Kuwait took a nearly 100 % stake in the bank in November 2007 . `` The two chief executive officers had no personal interest , gain or any dealings or trading in the shares of the Al Watany Bank of Egypt , '' Hermes said , adding that the company has taken the necessary legal actions to defend them . The bank 's deputy chief executives are also accused of gaining `` concealed '' percentages and conducting dealings without informing the stock market authority publicly , which is against the laws of the Egyptian Central Bank and the stock market . Gamal and Alaa Mubarak offered last month to pay a 2 billion-pound ( $ 330 million ) fine in reconciliation , but prosecutors denied the request , according to Adel Al-Saeed , a spokesman for the general prosecutor . The prosecutor `` insisted they plead guilty first , and all the defendants must also join them in this reconciliation effort , '' he told CNN . `` Only one other defendant offered to pay . '' Hosni Mubarak , who led Egypt for more than 30 years , was ousted by the Arab Spring protests last year and was found guilty of charges relating to the killings of hundreds of anti-government demonstrators during the revolution . The 84-year-old is reportedly in declining health and was moved to a military hospital last month .
Gamal and Alaa Mubarak are accused of insider trading . Prosecutors say they profited illegally from a 2007 bank sale . The court refused a request to release the two on bail . Comment: