In 1858 Thomas Strong leased the Horsefair Brewery in the Hampshire market town of Romsey, along with 22 tied public houses. In 1883 Thomas purchased the brewery outright and renamed it Strong & Co.
The company pursued a policy of acquiring breweries and licensed and tied pubs in Hampshire and the surrounding counties, and became incorporated as a limited company in 1894.
In 1969 Strong & Co. Ltd. was purchased by Whitbread together with 940 pubs.
The brewery in Romsey ceased production in 1981. In the late 1980s a large part of the Romsey site was demolished and the buildings which remained were redeveloped for offices.