The employers which feature in these records include multi-site companies, nationalised industries and public sector employers. This series also includes records relating to employers' associations, national industrial councils (subsequently renamed national advisory councils and sometimes known as combine committees) established by ASTMS to provide a focus for members in particular industries (e.g. railways) and multi-site companies (e.g. Rolls Royce). Subject files relating to industries as a whole are also included.
Whilst the bulk of files pre-dating 1967 are those of the Association of Supervisory Staffs, Executives and Technicians (ASSET) a few originated in the offices of the Association of Scientific Workers (ASW).
This series is arranged alphabeticallly by name of company.