Arjuna Mahendran, a Singapore national of Sri Lankan origin, was accused in 2015 of passing sensitive information to his bond-dealer son-in-law to make millions in undue profits.
On Monday the Attorney General's department handed over documents amounting to 21,000 pages to the Ministry of Foreign Affairs and the Ministry of Defence of Sri Lanka to be lodged with Singapore.
Mahendran had been indicted in June for causing losses of more than US$11 million to the state. In March, Sri Lankan President Maithripala Sirisena said Singapore had not responded to his call in January to return Mahendran. Mahendran and his son-in-law are accused of manipulating bond auctions in 2015 and 2016. He was named a key suspect in the scam in February last year and fled. A damning presidential report into the scandal also accused Mahendran of insider trading and recommended the state recover its losses from the pair.