| Altibox Danmark A/S | Central Denmark Region |
| AM Consulting | |
| AM Denmark A/S | Capital Region of Denmark |
| Amass Technologies ApS | |
| Amathor ApS | Capital Region of Denmark |
| Ambition A/S | |
| Ambu A/S | |
| Amero ApS | Central Denmark Region |
| Amplex Denmark ApS | Central Denmark Region |
| Analona Therapeutics | |
| Andertech A/S | |
| Ankiro ApS | Capital Region of Denmark |
| AnRes Clinical | |
| Antag Therapeutics | |
| Anycloud | |
| Anyday A/S | |
| Anyware Solutions ApS | Capital Region of Denmark |
| AP Pension | |
| Apento ApS | |
| Apex Virtual Entertainment ApS | |
| Applicators ApS | |
| Apport Systems A/S | |
| Approxima A/S | |
| APPS People A/S | |
| Appsbuyout | |
| Appsin ApS | |
| Appstract Consulting ApS | Capital Region of Denmark |
| Appvestor ApS | |
| Aps Data-know-how | |
| Arcedi Biotech ApS | |
| Archii ApS | Capital Region of Denmark |
| Arenalogic ApS | Region Zealand |
| Arkitektskolen Aarhus | |
| Arosii A/S | Central Denmark Region |
| Art of Web | |
| Artboost | |
| Artco | Central Denmark Region |
| Artcoustic USA | Capital Region of Denmark |
| Artventure | |
| Artwork Systems Nordic A/S | |
| Aryze (BVI) Ltd | |
| ASA Software ApS | |
| Ascendis Pharma A/S | |
| Ascio | Capital Region of Denmark |
| Asento ApS | |
| Asetek A/S | |
| AskCody | |
| ASMdata | Capital Region of Denmark |
| Asmussen Media | |
| aspnethotel.dk | North Jutland Region |