Astro
- 01Cyberaton
- 11 Bit Studios
- 4 Fun Media
- 4Mass
- AB
- ABC Data
- Abm Solid
- ABPL
- ABS Investment
- AC
- ACAUTOGAZ
- Acrebit
- Action
- Adatex Deweloper
- Advertigo
- Aforti Holding
- Agora
- Agroliga Group PLC
- Agroton
- Ailleron
- Airway Medix
- Aiton Caldwell
- Alchemia
- Alior Bank
- Alma
- Altus
- Alumast
- Alumetal
- Ambra
- Amica
- AmRest
- Analizy Online
- Apator
- Aplisens
- APS
- AQT Water
- Aqua
- Archicom
- Arctic
- Arctic Paper
- Arcus
- Art Games Studio
- Artifex Mundi
- ArtP Capital
- Asbis
- Asseco Buisiness Solutions
- Asseco South Eastern Europe
- Astarta
- Astro
- Atal
- ATC-Cargo
- Atende
- Atlanta Poland
- Atlantis
- Atlas Estates
- ATM
- ATM Grupa
- Atrem
- Auto Partner
- Auxilia
- Avia Solutions Group
- AviaAm Leasing
- Awbud
- Aztec International
- Baltona
- Bank Handlowy
- Bank Millenium
- Bank Ochrony Środowiska
- BBI Development
- Będzin
- Benefit Systems
- Berg Holding
- Beskidzkie Biuro Inwestycyjne
- Beta COM
- Binary Helix
- Bio Planet
- Biomass Energy Project
- BioMaxima
- Biomed Lublin
- Bioton
- Bit Evil
- BizTech Konsulting
- Black Point
- Bloober Team
- BNP Paribas
- BoomBit
- Boruta-Zachem
- Boryszew
- BOŚ
- Bowim
- BPX
- Brand24
- Bras
- Braster
- BRIJU
- BSC Druk
- BTC Studios
- Budimex
- Bumech
- Bytom
