- Aapo
- Aatos
- Aavagen
- Aava Mobile
- Aava Ohjelmistot
- Aavi Technologies
- Aavu
- Abacus Diagnostica
- Abomics
- About Her App
- Absentus
- Absolute-North
- Acament
- Acoustic Extra Freezing
- Action-Reaction Games
- Action Squad Studios
- ADA Drive
- Adamant Health
- Adaptio.io
- Adaptos
- Add Inspiration
- AddNow
- AddSearch
- Adesante
- Aditux / Red Solution
- adlearning
- AdminLabs
- Adusso
- Advacam
- Advisus
- aecmaster
- Aeromon
- Aetlan
- Agileday
- Agilefant
- Ahkera Smart Tech
- Ai2Ai
- AIATELLA
- Aibidia
- AIContentfy
- Aida
- Aidon
- Aid One
- Aiforia Technologies
- AI IO
- Aikumo
- Aila
- Ainak
- Aina Wireless
- aino.ar
- Airawise
- Aircohol
- Air Dice
- AirFaas
- Airmodus
- Airpay
- Aitofit
- Aiven
- Aivo Health
- Aiwo Digital
- AJR Solutions
- Alberga Brewing Company
- Albertine
- Albert Welding
- Alfons Education
- Algorithmiq
- Alinor
- Almondella
- Almost Human
- Alpakka Media
- AlphaSense
- Altal
- Altonova
- Altum Technologies
- Alula Energy
- Alvar Pet
- Alvidio
- Amandan Healthcare
- Ambio
- Ambronite
- Amistech Games
- Amped
- amplaffy
- Ample
- Ampliconyx
- Amplifiles
- Ampner
- Analyse²
- Anders Innovations
- Anicare
- Aniway
- Annie Advisor
- AnttiPatterns
- Anyhau
- APE Payment
- Apiable
- Apifonica
- Aplagon
- AppFollow
- AppGyver
- Applixure
- Apprien
- Appstylist
- Apukuski
- Aqsens Health
- Aqsens (New ID: 2817656-9)
- Aquaminerals
- Arador Innovations
- Arbitron Mobile
- Arctic Farming
- Arctic Security
- Arctic Warriors
- Ardilla
- Arilyn
- Arkkeo
- Artific Intelligence
- Artome
- Asema
- A.S.Helsingö
- Asimos
- Askel Healthcare
- AskKauko
- Asqella
- Assetti
- Assure
- Astalo Games
- Aste Finland
- Asuntoarvio.fi
- Athlos
- Attractive.ai
- Audicin
- Audiodraft
- Audiomimi
- AudioSauan
- audiospace.io
- Augmented Climbing Wall
- Augumenta
- Auntie
- Aurealis Pharma
- Aurelia Turbines
- Aurora Propulsion Technologies
- automate.video
- Autoprod
- Autori
- Avanto Technologies
- Aves Netsec
- awake.ai
- Axel Technologies
- Axinoss
- Axitare
- AXO Games