SAN ANTONIO — C.H. Guenther & Son L.L.C. has acquired Mid South Baking Co., supplier of buns and English muffins to quick-service restaurants in the southern United States. Financial terms of the transaction were not disclosed.

Founded in 1978, Mid South provides buns and English muffins to 3,500 McDonald’s restaurants in 18 states. The company operates two baking plants, in Bryan, Texas, and Pelahatchie, Miss.

“C.H. Guenther’s culture, scale, product set and manufacturing expertise will allow Mid South to grow our reach and better serve our customers,” said Steve Warden, president of Mid South. “They are well-aligned with our emphasis on customer service and product quality, and we believe we can accomplish great things together.”

C.H. Guenther & Son, owned by Pritzker Private Capital, produces branded and private label food products. With the acquisition of Mid South, the company now employs more than 3,500 in 24 food manufacturing locations in the United States, Canada and Western Europe. The company’s roots date to 1851, when Carl H. Guenther built a flour mill near Fredericksburg, Texas. The business moved to San Antonio in 1859 and was renamed Pioneer Flour Mills in 1898. The original name was readopted in 1999. Following a period of rapid expansion in the 2000s, the business was acquired by the Pritzker Group in 2018.

“Steve and the rest of the Mid South team have an impressive track record of success building the company into the market-leading bakery it is today,” said Dale Tremblay, chief executive officer of C.H. Guenther. “They have been able to scale with their customers while maintaining the highest levels of service, quality and safety. We are thrilled to welcome Mid South to the C.H. Guenther family and look forward to working together to better serve our collective customers.”

The acquisition of Mid South is the third for C.H. Guenther in the past year. In January, the company acquired German bakery supplier Wback, and in 2018, C.H. Guenther acquired Cookietree Bakeries.