- Pureon AG
- PuroGusto
- PUTZMUNTER & Co.
- Puzzle ITC GmbH
- PVsyst SA
- PW WaferTec GmbH
- PwC
- PX Services SA
- PXL Vision
- PZ Personalberatung Zürich
- PZM AG
- PZM Psychiatriezentrum Münsingen AG
- Q_PERIOR AG
- Q.C.M. quality control management AG
- Q11 AG
- QLOCKTWO Swiss GmbH
- QoQa Services SA
- Quali-Night AG
- Qualibroker AG
- Qualibroker AG / IBC Insurance Broking and Consulting AG
- Qualibroker Romandie SA
- QUALICOAT
- Qualinsur
- QUALIPET AG
- Qualis AG
- Qualiservice GmbH
- Qualitas AG
- Qualitätsmanagement
- Qualitech AG
- Quality Control NDT SA
- Quality Personal Service Zürich AG
- Quality1 AG
- QualiVision AG
- Quant Service GmbH
- Quantica Capital AG
- Quantum Group AG
- Quantum Leben AG
- Quantuvia AG
- Quartzteq GmbH
- Quest Executive Search
- QUESTEL
- Quickline AG
- Quickmail AG
- Quooker Schweiz AG
- QUORUM SOFTWARE SA
- Quotient
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