Bedrift A - Østerås
- AS Husaby
- Alpene AS
- Actinia AS
- Abaci AS
- Arnulf Eriksen
- Alltid Tjenester
- Airhist Risøy
- Airtime Solli
- Anita Skogen
- Aaron Kramer
- Anler Rudez
- Ask Norway
- Andersen Vipconsult
- Ask Norway
- Aamodt Eiendom A/S
- Anita Langgaard
- Arnet Consulting
- Alley Oop AS
- Apex Nova AS
- Alpha Properties AS
- Auset Invest AS
- Alexandra Chamorro AS
- Alfa Medical AS
- Axel Kleive
- Anne-Grethe Ottesen
- Advokatfirma Alexander Rukin
- Aibel Pensjonistforening Asker
- Adeco A Dalane
- Advokat Henning Lauridsen
- A.Sigurdardottir Audur Sigurdardottir
- Advokat Lind-Iversen
- Ark Østerås Senter
- Andresen Jes Georg
- Arkitekt Elias Mølnvik
- AniCura Dyreklinikk Østerås
- ABC Mojo Capital Holding AS
- Asker og Bærum Trekkspillorkester
- Alpha Omega Life Tsernisof
- Anne-Lise Arneberg Konsulenttjenester
- Aktiv Transport Daniel Constantin Gavril
- Anne Cecilies Interiørdesign Anne Cecilie Blakstad