U.S.-based oil and natural gas company Diamondback Energy Inc. has completed additional tack-on acquisitions in the Northern Midland Basin for $312.5 million.

The additional acquisitions bring Diamondback’s deal-making for the quarter to well over $10 billion worth of transactions.

Recently Diamondback Energy acquired Ajax Resources LLC, an E&P backed by Kelso & Co. with leasehold acreage in the Northern Midland Basin in a $1.25 billion cash-and-stock deal.

Later, the company followed up its Ajax deal with an agreement to buy U.S. oil and gas exploration and production company Energen Corp. in an all-stock transaction worth roughly $9.2 billion including debt.