- Sabio
- Saehan
- Sagem
- Sager Midern
- Sampo
- Samsung
- Sanyo
- Sapphire
- Sceptre
- Seanix
- Sega
- Seiko
- Sendo
- Sensory Science
- Sequent Systems
- ServerWorks
- SGI Memory
- Shamrock
- Sharp
- Shuttle
- Siemens Nixdorf
- Sigma
- Sima
- SiPix
- Skywell
- SMal
- SMT
- Snap Appliance
- Soltek
- SONICblue
- Sono Computer
- Sony Memory
- SOTEC
- Sound Vision
- Sowah
- SOYO
- Spacelabs Medical
- Spica
- Spring Circle
- Spyrus
- Stargate
- Suk Jung
- SUMA
- Sun Memory
- Sunflower
- Sunrace
- Sunrex
- SuperGrace
- Supermate
- SuperMicro
- SuperPower
- SuperTek
- Survivalink
- Swan
- Sybercom
- Syntax
- Sys Technology
- Systemax
