| CyNexo S.r.l. | |
| Cynoms Agritech | |
| Cyrillic S.r.l. | |
| Cyrius Consulting | |
| Cytosens | Milan |
| D e D Automazione Industriale | Milan |
| D-Orbit S.p.A. | |
| D.A.Tel S.n.c. | Florence |
| D.B.L. Di Benedetto Luigi & C. S.a.s. | Friuli-Venezia Giulia |
| D.B.R. S.r.l. | Vicenza |
| D.Electron S.r.l | |
| D1GIT | |
| D4RE | Milan |
| Dacuna Studio | Brescia |
| Daedalusxr | |
| Dagomedia S.r.l. | Ancona |
| Daimon Art S.n.C. | |
| Daisoft | Pesaro and Urbino |
| Dam Sistemi S.r.l. | Reggio Emilia |
| Damedia | Avellino |
| Daniele Martini | Pistoia |
| DaniSoft S.r.l. | Brescia |
| DAo Studio S.r.l. | |
| Darwin Computing | Turin |
| Data Appeal Company S.p.A. | |
| Data Job | Venice |
| Data Masters S.r.l. | |
| Data Proget S.r.l. | Arezzo |
| Data Recovery Service Italia | Milan |
| Data Rescue Italia | Milan |
| Data Science Milan | Milan |
| Datacode S.r.l. | Modena |
| Datacom | Livorno |
| Datadisc.it S.r.l. | Syracuse |
| Datagest S.r.l. | Pesaro and Urbino |
| Datagram Informatica Soc. Coop | Milan |
| Datalab S.r.l. | Padua |
| DataLabor.com | Parma |
| Datalogic | Bologna |
| Datamatic S.p.A. | Milan |
| DataMind S.r.l. | |
| Datarecovery S.r.l. | Rome |
| DataScienceLAB | |
| DataSecurity S.r.l.s. | Friuli-Venezia Giulia |
| DataSinc S.r.l. | |
| DataSoftware S.r.l. | Bari |
| Datasys Network S.r.l. | Milan |
| Datatex | Milan |
| Dataweb Service | Milan |
| Datawizard | Rome |