MCX held 10 per cent stake in DGCX when it began operations in 2005 and later reduced it to 5 per cent.
"The stake of MCX in DGCX, got diluted from 5 per cent to 3.4 per cent of the paid capital of DGCX in July 2013 due to a rights issue by DGCX," the bourse said in a filing to the BSE.
Except for the change in the shareholding percentage of MCX, there has been no other change for the exchange, it said.
MCX is promoted by Jignesh Shah's Financial Technologies India Ltd (FTIL), which currently holds 39 per cent DGCX. FTIL is a co-promoter in Dubai-based bourse.
The shares of MCX rose by 4.58 per cent to Rs 399.9 a piece on the BSE at 1300 hours.