The consumer watchdog has cleared Circle K's proposed acquisition of eight Texaco-branded service stations in Dublin and Meath.
Nine of the 13 Pelco-operated filling stations were originally included in the proposed transaction.
The Competition and Consumer Protection Commission gave the green light after Circle K agreed not to proceed with purchasing one of the service stations, located in Coolock.
As part of the deal, the forecourt retailer also agreed to divest its service station on Beaumont Road to another operator under a long-term lease arrangement.
An investigation by the CCPC found that while competition would not be substantially lessened in most areas as a result of the transaction, it said "potential issues could arise in certain parts of north Dublin."
"Circle K holds a large share in the retail sale of motor fuels in Artane and Coolock in north Dublin, far greater than any remaining supplier there. If the transaction went ahead as proposed, Circle K's share would increase significantly," the consumer watchdog added.
The CCPC said following the investigation and in light of the legally-binding commitments made by Circle K, it concluded that "the transaction will not result in a substantial lessening of competition."
An independent monitoring trustee will be appointed to ensure Circle K complies with the agreed commitments.
Circle K is the largest service station operator in the State, with over 400 premises across the country.
