The Sunbeam name was first registered in 1888 by John Marston, a Wolverhampton industrialist who had built his business through tinplate manufacturing and then pedal cycling. Sunbeam motor car manufacture began in 1901 with experimental vehicles, and by 1905 the motor business was separated from Marston's cycle interests into the newly incorporated Sunbeam Motor Car Company Limited.
Breton car designer Louis Coatalen joined Sunbeam from Hillman in 1909 and became chief designer. He reorganized production to bring almost all components in-house, improving quality and consistency. By 1911 Sunbeam was building 853 cars a year and was regarded as a substantial manufacturer. In June 1920, French company Darracq acquired Sunbeam, and following Darracq's acquisition of London manufacturer Clement-Talbot in 1919, the three businesses were combined under the holding company S.T.D. Motors Limited, with the initials representing Sunbeam, Talbot, and Darracq. Each brand retained its separate identity — Sunbeam cars continued to be built at Moorfield Works, Wolverhampton.
Sunbeam's production cars were known for quality engineering. The company at its height in the 1920s employed 3,500 staff at its 50-acre Moorfield works. Its most successful models by volume were the 16 hp (known as the 16.9) and the 20 hp (known as the 20.9), both introduced in 1926. The 20.9, with a 3-litre engine producing 70 bhp, was capable of 70 mph and represented the core of Sunbeam's commercial range. A 3-litre Super Sports model, Sunbeam's direct answer to the Bentley, was produced between 1926 and 1930 and became the first production twin-cam car in the world after it finished second at Le Mans in 1925.
Coatalen's enthusiasm for motor racing drew Sunbeam into serious Grand Prix competition. In 1921, the team ran a straight-eight twin-cam car influenced by designer Ernest Henry, a technically sophisticated machine that went on to win the 1922 Tourist Trophy in the hands of Jean Chassagne. Different 2-litre twin-cam cars designed by Henry were entered for the 1922 French Grand Prix.
Henry Segrave drove for Sunbeam from 1921 onwards and became the team's most celebrated Grand Prix driver. He won the 1923 French Grand Prix and the 1924 Spanish Grand Prix in Sunbeam machinery, marking the high point of the company's competitive racing career. The cost of sustaining this Grand Prix programme proved unsustainable, and in 1924 Sunbeam was unable to repay the money borrowed over a decade to fund it. A receiver was appointed, though S.T.D. Motors continued to operate the business.
Sunbeam's other major racing arena was the pursuit of the world land speed record. Coatalen built a purpose-designed V12 racer using an 18.3-litre engine that combined elements of the Sunbeam Manitou and Sunbeam Arab aero engine designs. This car, the Sunbeam 350HP, established three land speed records; the first was achieved by Kenelm Lee Guinness at Brooklands in 1922 at 133.75 mph. Malcolm Campbell subsequently purchased the car, renamed it Blue Bird, and drove it to 146.16 mph at Pendine Sands in September 1924, then 150.76 mph the following year.
In 1926, Segrave captured the record again in a new 4-litre V12 Sunbeam. Coatalen then constructed the genuinely enormous Sunbeam 1000HP, powered by two 450-horsepower Matabele aero engines. On March 29, 1927, the car achieved 203.792 mph at Daytona, becoming the first car to exceed 200 mph. That car is now at the National Motor Museum at Beaulieu.
During the First World War, Sunbeam manufactured aero engines and built 647 aircraft to the designs of other manufacturers, including Short Bombers, Short 310s, and Avro 504 trainers. The company's aero engine range included the V12 Sunbeam Cossack at 320 hp and the V12 Sunbeam Sikh at 800 hp, though several designs suffered reliability problems. The V8 Sunbeam Arab, ordered in quantity from 1917, was troubled by vibration and saw only limited service.
Sunbeam did not recover from the Depression era. Financial difficulties deepened and in October 1934 a receiver was appointed. Sunbeam was subsequently purchased by the Rootes brothers, who chose not to resume production of the existing car range. Trolleybus production, under the Sunbeam Commercial Vehicles subsidiary, continued after the sale and ultimately passed to Guy Motors in 1948, with Sunbeam trolleybuses being built until 1964.
The Sunbeam name was kept alive under successive owners as a marque and eventually a model name, appearing on Rootes, Chrysler, and PSA-badged vehicles until the Talbot Sunbeam was discontinued in 1981.