Business services companies established in 1931

Air Service Training (AST) is an organisation in Perth, Scotland, that has been training engineers and pilots for airlines, maintenance organisations and the military since 1931. It is owned by Perth College UHI, with training taking place on the college campus and at Perth Airport, near Scone. In addition to holding a UKCAA Part 147 Approved Basic Training Approval AST Also holds Direct Foreign EASA Part 147 Basic Training Approval and Nepalese NCAR 147 Approval.

Affiliated Foods Midwest was a retailers' cooperative based in Norfolk, Nebraska, Elwood, Kansas and Kenosha, Wisconsin, serving the states of Oklahoma, Kansas, Colorado, Wyoming, Nebraska, Missouri, Illinois, Wisconsin, Iowa, South Dakota, North Dakota, Minnesota, Arizona, Arkansas, Kentucky and Michigan. It distributed Shurfine products, and was affiliated with IGA (supermarkets).

Alex Lee, Inc. is an American holding company headquartered in Hickory, North Carolina, United States. Alex Lee is ranked 139 on the list of largest privately held companies in the United States, as listed by Forbes. Alex Lee owns the Lowes Foods supermarket chain as well as Merchants Distributors, Inc., which supplies more than 600 stores located in nine states, mostly in the Southeast.

The Audit Bureau of Circulations (ABC) is a non-profit organisation owned and developed by the media industry. ABC delivers industry-agreed standards for media brand measurement of print publications, digital channels and events. The company also verifies data, processes and good practice to these and other industry-agreed standards (such as those set by JICWEBS).

EWOS or EWOS Group, was then one of the world's largest suppliers of feed and nutrition for farmed fish. Former EWOS companies operate in Canada, Chile, Norway, Scotland and Vietnam as part of Cargill Animal Nutrition, CAN.

Diploma plc is a British business supplying specialised technical products and services based in London, England. It is a constituent of the FTSE 100 Index.