Home Depot bought SRS Distribution — the subsidiary that’s acquiring GMS — last year for $18.25 billion, in the largest acquisition in its history. Texas-based SRS sells supplies to professionals in the landscaping, roofing and pool businesses and it has bought up many other smaller suppliers as it’s grown.

The retailer’s SRS subsidiary will initiate a cash tender offer to acquire all GMS common stock for $110 per share.

Home Depot said one of its business units was buying building-products distributor GMS for some $4.3 billion, prevailing in a bidding war and showing just how seriously the home-improvement chain is about winning the market for professional contractors at a time the do-it-yourself market is tough going.