"Last week we had taken them into custody. We are interrogating them," DCP South Dr S D Sharanappa told PTI.
Those arrested are Vikram Investment Company owner Raghavendra Sreenath and agents Sutram Suresh (former journalist), Narasimhamurthy, K C Nagaraj and Prahlad, he said.
Asked about reports in a section of media metioning names of some high-profile celebrities among those who had been duped, the DCP declined to comment, saying interrogation was on.
Sharanappa said a case was registered against the firm and the five persons on a complaint by one of the investors P R Balaji, who owns an incense sticks company, that they had cheated him,
The complainant alleged that the agents assured him guaranteed profits in commodity trading, but did not honour it.
Raghavendra set up the compay and appointed a few men including Suresh as agents promising them good money, police said.