The suspects were produced before the ATC under stringent security on Saturday afternoon.
The directors of FCS Rana Shahid, Muhammad Khan Chachar and Kamran Abbasi are accused of serving a female member of a political party and involved in corruption worth tens of millions of rupees.
Meanwhile, two more suspects Muhammad Naeem and Junaid alias K-2 were also given under custody of Pakistan Rangers for 90 days.
Naeem and Junaid are accused of involvement in target killing, extortion demanding and other serious crimes.
They were also said to be affiliated with another political party of Karachi.