According to an ED order, the agency has seized movable and immovable properties of the firm M/s N K Proteins in Mumbai, Noida, Ahmedabad and Palanpur in Gujarat under the criminal provisions of the Prevention of Money Laundering Act (PMLA).
"The total value of the seized assets is Rs 18.1 crore," the order said.
The central probe agency's Mumbai unit had registered a criminal FIR in this case in October last year to probe money laundering instances in the Rs 5,600 crore scam.
It has so far attached assets to the tune of over Rs 500 crore of the defaulting firms and is conducting a parallel probe in this case alongside the Mumbai Police and other investigative agencies.
The National Spot Exchange Limited's payment troubles started after it was ordered by regulator Forward Markets Commission (FMC) in July last year to suspend spot trade in most of its contracts due to suspected trading violations.
The exchange could not settle the outstanding trades, sparking investigations by the police and regulators to find out whether the exchange had defrauded traders by not enforcing rules requiring sufficient collateral to be set aside.