| Aracne S.r.l. | Campobasso |
| Arakne S.r.l. | Rome |
| Aram S.r.l. | Milan |
| Araneum Group S.r.l. | Rome |
| ARCA Dynamics | |
| Arcae S.r.l. | Bologna |
| Archas S.n.c. | Milan |
| Archibuzz S.r.l. | |
| Archimede Informatica | Rome |
| ArchiMedia S.r.l. | Rovigo |
| Archivist | Modena |
| Archynet S.r.l. | Turin |
| Arcturus S.a.s. | Turin |
| Ardea S.r.l. | Sondrio |
| AreaNetworking.it | Vicenza |
| Aredici S.r.l. | Bologna |
| Arema Security System S.r.l. | Parma |
| Ares2T S.r.l. | Rome |
| Aresys | Milan |
| Argo Business Solutions S.r.l. | |
| Argo Business Solutions S.r.l. | |
| Argo Elettronica S.r.l. | Modena |
| Argo Partners S.r.l. | |
| Argo Software S.r.l. | Ragusa |
| Argotec S.r.l. | |
| Aria Sensing S.r.l. | Brescia |
| Aries Tech | |
| Aristea International S.r.l. | |
| Arithmos S.r.l. | Verona |
| Arkage | |
| Arkomedia S.r.l. | |
| Armonia S.r.l. | |
| Armundia Group | |
| AroundMe | Turin |
| Arsenale Bioyards S.r.l. | |
| ARSinform | Milan |
| Artattack Group S.r.l. | |
| Artax S.r.l. | Bologna |
| Arte-Web.it | Bologna |
| Arteco S.p.A. | Ravenna |
| Artedas Italia S.r.l. | Turin |
| Artel S.r.l. | Parma |
| Artematika S.r.l.s. | Rome |
| Artificial Intelligence System Engineering | Rome |
| Artwork Web Agency Milano | |
| ArtyTech | Vicenza |
| Aruba S.p.A. | |
| Aryel | Milan |
| Aryma | |
| AS Web Agency S.r.l. | Padua |