- S3 Incorporated
- Sabritec
- Sage Laboratories, Inc.
- SAIA-Burgess
- Samtec
- Samsung
- Samsung
- Samsung Electro-Mechanics
- SanDisk Corporation
- Sanken Electric Co., Ltd.
- Sanyo Denki
- SaRonix
- Sawtek
- SB Electronics
- Scenix Semiconductor, Inc.
- Schaffner EMC
- Schott Corp.
- Schroff
- Schurter
- Sebring Systems, Inc.
- SEEQ
- SEI Electronics, Inc.
- Seiko Instruments
- Selco Products Co.
- SEMCO
- Semicoa
- Semiconductor Technology
- Semitron
- Semtech
- Sensitron Semiconductor
- Sensor Scientific, Inc.
- Sensory, Inc.
- Sentry Manufacturing
- Serpac Electronic Enclosures
- SGS-Thomson
- Shafer Magnetic Components
- Shallco
- Sharp Microelectronics
- Shindengen America, Inc.
- Shogyo International Corp.
- Siemens
- Siemens Matsushita Components
- Sierracin/Magnedyne
- Sigma Designs
- Sigma Electronics, Inc.
- Signal Processing Technologies (SPT)
- Signal Technology Corp.
- Silicon Integrated Systems Corp.
- Silicon Magic
- Silicon Motion, Inc.
- Silicon Storage Technology (SST)
- Silicon Systems
- Silonex, Inc.
- Silver Cloud Manufacturing Co.
- Simtek
- Sipex
- SiRF Technology, Inc.
- SIWARD International
- Skynet Electronic
- SL Waber
- Smart Modular Technologies, Inc.
- S-MOS Systems
- Solen, Inc.
- Solid Electric, Inc.
- Solid Solutions
- Solid State Advanced Controls (SSAC)
- Solid State Optronics, Inc. (SSO)
- Sony Semiconductors (in USA)
- Sorenson Lighted Controls (SoLiCo)
- Southco, Inc.
- Southern Electronics
- Space Electronics
- Specialty Electronics
- SpecTran Corp.
- Spectrol Electronics Corp.
- Spectrum Control
- Spellman High Voltage Electronics Corp.
- Spin Logic
- S.P.K. Electronics Co., Ltd.
- Sprague
- Stacoswitch
- Standard Microsystems Corp. (SMC)
- Standex Electronics
- Stanford Microdevices
- Stanley Electric Co., Ltd.
- State of the Art (SOTA)
- Steward
- Stewart Connector Systems
- StockCap
- Storm Products
- Sumida Electric Co.
- Summit Microelectronics, Inc.
- Sun Microelectronics
- Sunny-Emi
- Sunon
- Sun Opto, Inc.
- Supertex
- Surface Mountable Electronic Components, Inc. (SMEC)
- Surge Components, Inc.
- Svenska Grindmatriser AB
- Switchcraft/Raytheon
- Switching Systems International (SSI)
- Switch Wizard
- Symbios
- Synario
- Synergy
- Synergy Microwave Corp.
- Synopsys
