Contents:
- Semaphore Computer Systems Ltd
- SEMS
- SEN Electrics
- Senodata
- Senodean Ltd
- Serck Group
- Sfena Ordo Processeur
- SGL Homalite
- Shade
- Shannon Ltd
- I.P. Sharp Associates Ltd
- Shefra Graphics
- Siemens
- Sigma Electronic Systems Ltd
- Simplex Time Recorder Co (UK)
- Simplified Accounting Computers
- Singer Business Machines
- Sintrom Electronics Ltd