- K2 LIFT
- K2 Systems GmbH
- K2 Systems s.r.l.
- K2 Wohnkonzepte
- K29
- K2arch
- K2LD Architects Pte Ltd
- K2S
- K2SA Controls + Lighting
- K3m architects
- K5
- K8 Radiatori
- KA Architecture
- KA ARQUITECTOS
- KA STUDIO
- kaa
- kaa studio
- Kaal Masten BV
- Kaamos
- KAAN Architecten
- KAARchitecture
- KAB Seating Limited
- Kaba AB
- kabala immobiliare
- Kabelschlepp Italia S.r.l.
- Kabeltec GmbH
- Kabelwerke Villingen GmbH
- kabu studio
- KABUSA DESIGN FACTORY
- KaCaMa Design Lab
- KACH
- KACO new energy Italia srl
- KAD3 srl
- Kadarik Tüür Arhitektid
- kadawittfeldarchitektur