The investigation was ordered by the Corporate Affairs Ministry in April last year following huge public outcry over the scam that duped hundreds of gullible investors by running fraudulent money-pooling schemes in the garb of chit funds.
Sources said the probe agency is now expected to submit its final report to the Ministry in June.
At the time of ordering the probe, SFIO was expected to submit its final report in December 2013. The agency had given its interim report to the Ministry in September last year.
According to sources, SFIO is also co-ordinating with capital market regulator Securities and Exchange Board of India (Sebi) with regard to the case. The latter is also looking into various entities that have raised money from the public by way of illicit investment schemes, they added.
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More than 60 companies, most of them from the eastern states of the country, that are believed to have cheated the public of their money are being probed by SFIO.
SFIO, in its interim report, had said that companies under the scanner indulged in serious financial mismanagement besides siphoning off the funds by their promoters, who exploited regulatory gaps.
"There has been proliferation of innovative financial products in the market due to technological advancement and extensive use of the internet to market such products to investors," it had said.
Generally state governments are the appropriate authorities for regulations of such 'chit fund' companies under the Chit Funds Act 1982.
An Inter-Ministerial Group has also been set up to ensure better regulatory co-ordination in dealing with the menace.