Taiheiyo Cement's US subsidiary CalPortland agreed to buy Vulcan Materials' California ready-mix concrete operations for $712 million in cash. The deal covers 41 ready-mix plants and two cement terminals, which had about $524 million in 2024 sales. The deal CalPortland bought the operations as an asset purchase, paid in cash. The plants are in the San Francisco Bay Area and San Diego. When the deal was announced on October 28, 2025, closing was expected by December 2025. It took until June 8, 2026, after an antitrust review, when both sides said the transaction was complete. Strategy Taiheiyo said the purchase gives CalPortland a presence in Northern California, where it had not operated, and strengthens its base in Southern California. It linked the deal to its 2024-2026 medium-term plan to grow the U.S. business and strengthen its supply chain, and pointed to demand from AI data centers, power infrastructure and housing. Taiheiyo's U.S. business dates to 1990, when it bought California Portland Cement, now CalPortland. In March 2022 it agreed to buy a California cement plant and related assets for $250 million. Antitrust review In May 2026 the Justice Department's Antitrust Division and the California attorney general filed a complaint in federal court in Washington, D.C., saying the deal would make the two companies one of the largest ready-mix suppliers in San Diego County, with a combined share above 50%. A proposed settlement filed with the complaint requires Taiheiyo and CalPortland to sell plants in Escondido and Oceanside, lease rights at a Lakeside plant, 15 ready-mix trucks and related permits and records. The named buyer is Holliday Rock Co., or another buyer the government approves. The settlement was published in the Federal Register for a 60-day public comment period, and it still needs court approval. The seller For Vulcan the sale ends its California ready-mix business. In the same June 8 announcement it said it had bought Brannan Sand & Gravel's southern Colorado and Dallas-Fort Worth operations, including a rail-served quarry in Lamar, Colorado, which it described as fitting its aggregates-led growth strategy. Rock Products noted that the exit leaves Vulcan's ready-mix presence essentially limited to Virginia.
