- SGS Aargau GmbH
- SGV Holding
- SH POWER
- ShAir AG
- Shankai Sports
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- Shell (Switzerland) AG
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- Shine Communication Sàrl
- Shinsen AG
- Shiptec
- Shiso Burger
- SHL Medical AG
- SHL Schweizerische Hotelfachschule Luzern
- Shoppi Tivoli Management AG
- SHS Haustechnik AG
- SI Group-Switzerland GmbH
- SIA
- SIB Swiss Institute of Bioinformatics
- SIBATEC AG
- SIBIRGroup AG
- SIC invent AG
- SICK AG
- SICK System Engineering AG
- SICPA
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- Sidley Austin LLP
- Sidroga AG
- SIE SA - Service intercommunal des énergies
- Sieber Cassina + Partner AG
- Sieber Solutions AG
- Sieber Transport AG
- Sieber Transport Pratteln AG
- Sieber Transports Villeneuve SA
- SIEGE
- Siegfried AG
- Siegwerk Switzerland AG
- Siemens
- Siemens Healthineers International AG
- Siemens Mobility
- Siemens Schweiz AG
- Siemens Smart Infrastructure
- Sievert AG
- SIG
- SIG allCap AG
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