Sharp, Roberts & Company was an engineering, machine and locomotive manufacturing firm formed by Thomas Sharp and Richard Roberts. The original company, Sharp Roberts, was founded in 1822. The company intially had its premises at Globe Works, Faulkner Street, Manchester before moving to Atlas Works in Great Bridgewater Street, Manchester. In spite of the products from the firm being known as "Sharps" or Sharpies it is Roberts who provided the dominant engineering skills. The first locomotive was constructed for the Liverpool & Manchester Railway, a 2-2-0: No. 32 Experiment. Three similar locomotives were constructed for the Dublin & Kingstown Railway. These early products suffered from steam leakage from the vertical cylinders and these were subsequently abandoned. In the new design the cylinders were placed under the smokebox and the 2-2-2 type was adopted with outside frames with additional inside bearings for the driving axle, and a combined dome and safety valve fitted near the chimney. Ten of this type were supplied to the Grand Junction Railway in 1837. 600 of this type were made between 1837 and 1857 and were supplied to France, Italy, Germany, Belgium, Holland, Russia and Spain. In 1843 Roberts left the firm and it became Sharp Bros.

In 1843 Richard Roberts left Sharp, Roberts & Company, and the company became known as Sharp Bros. In 1852 John Sharp who was the senior partner retired & Charles Patrick Stewart took over. The name of the company was consequently changed to Sharp Stewart & Company.

In 1811 the firm Sharp, Greenleaves & Co had premises in New York Street with a Warehouse at Oxford Street Wharf in Manchester. c.1822 the Sharp offered Richard Roberts a partnership and the firm became Sharp, Roberts & Company, Engineers, Globe Works, Faulkner Street. In 1825 Roberts invented the self-acting spinning mule, and by 1833 the company's first locomotive was built for the Liverpool and Manchester Railway. In 1843 Richard Roberts left and the firm became Sharp Bros. In 1852 John Sharp who was the senior partner of Sharp Bros. retired and Charles Patrick Stewart took over. The name of the company was consequently changed to Sharp, Stewart & Company, becoming a limited company in 1864. Throughout the 1850’s – 1880’s, Sharp Stewart made locomotives, but also continued to make machines, tools and carry out foundry work. The company soon needed bigger premises as orders for locomotives increased significantly and the lease on their Atlas works site in Manchester was due to expire. By 1887 the Clyde Locomotive Company was for sale and Sharp Stewart decided to move its business to Glasgow where wages and rates were lower than in Manchester and where they would also have access to sidings and docks at the site of the Clyde Locomotive Works. Walter Neilson sold the Clyde Locomotive Company to Sharp Stewart who renamed the works the Atlas Works after their old premises in Manchester. The move to Glasgow was completed by 1888 and within a short period of time, work in Glasgow began to exceed production levels Sharp Stewart had been achieving in Manchester. Orders for locomotives came in from all over the world, predominately from Asia, South Africa & South America, as well as the domestic market and industry. When the company became part of the North British Locomotive Company in 1903, Sharp Stewart & Co Ltd employed 2000 people and was producing on average 150 locomotives per year. By this time Sharp, Stewart had produced over 5000 locomotives. The works retained the name Atlas Works at amalgamation.

The company was founded by Walter Neilson in 1884 after leaving Neilson & Co. The Clyde Locomotive Works was established at Springburn, Glasgow, across the railway line from Neilson & Co’s Hyde Park Works. The company was not a success (completing only 23 locomotives) and was taken over by Sharp Stewart & Company in 1887.