Reacting to the move, shares of Crompton Greaves declined 7.77 per cent to Rs 155.40 at the BSE.
On the NSE, the scrip was down 7.71 per cent to Rs 155.55.
The two private equity firms will then make an open offer for additional shares to gain ownership of the consumer unit of Avantha Group -- Crompton Greaves Consumer Electricals (CGCEL) -- which will be listed on the National Stock Exchange and the BSE.
In February this year, Crompton Greaves' Board had approved full demerger of its consumer products business, saying that shareholding of CGCEL, upon completion of the demerger, will mirror the shareholding of Crompton Greaves.