Thomas Grimshaw & Sons were hosiery manufacturers at 10 Church Street, Manchester. The company owned a cotton mill in Littleborough, Rochdale, called Sun Mill. According to the Lancashire Trade Directory of 1879, Grimshaws were producers of flannels, baize, blankets and dometts. By 1900 the company's premises were at 15 New Brown Street, Manchester and there seems to be no record of the business beyond this year.