Acquisition Adds Approximately $12 Million of Annual Revenue

Installed Building Products, Inc. (the "Company" or "IBP") (NYSE:IBP), an industry-leading installer of insulation and complementary building products, today announced the acquisition of Diamond Energy Systems, Inc. ("DESI"). With headquarters in St. Joseph, MN, DESI specializes in mechanical insulation with the majority of its sales derived from retrofit work between industrial and commercial applications.

During the month of May through May 18, 2026, IBP repurchased approximately 240 thousand shares of its common stock at a total cost of $51.2 million, including commissions, under its existing stock repurchase program. At May 19, 2026, the Company has approximately $425 million available under this program.

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