| SIRTI TELCO INFRASTRUCTURES S.P.A. | MI | 12492310961 | 596.420 | 21.063 |
| NSN ITALIA S.P.A. | MI | 05679490960 | 313.769 | 24.005 |
| MICOPERI S.P.A. | RA | 01350750392 | 300.923 | 92.242 |
| DANIELI AUTOMATION S.P.A. | UD | 00162990303 | 245.785 | 30.154 |
| STRACCIARI S.P.A. | BO | 00474870375 | 234.294 | 6.311 |
| TELEBIT S.P.A. | TV | 01144610936 | 215.502 | 7.104 |
| SIRTI DIGITAL SOLUTIONS S.P.A. | MI | 12492300962 | 212.549 | 19.488 |
| WARTSILA ITALIA S.P.A. | TS | 00917620320 | 193.538 | 68.607 |
| AERO SERVICE TECHNOLOGIES ITALY S.R.L. | MS | 01398820454 | 179.572 | 8.085 |
| ATITECH S.P.A. | NA | 05981720633 | 168.646 | 17.085 |
| BELRON ITALIA S.P.A. | MI | 02728000122 | 162.067 | 13.459 |
| ROLLS-ROYCE SOLUTIONS ITALIA S.R.L. | SP | 10705010154 | 156.231 | 7.749 |
| COMAS - COSTRUZIONI MACCHINE SPECIALI S.P.A. | TV | 00200400265 | 155.954 | 9.932 |
| MARESCA & FIORENTINO S.P.A. | BO | 00310940374 | 122.856 | 2.797 |
| CONSORZIO STABILE PROMETEO S.P.A. | FG | 03052560715 | 120.756 | 1.512 |
| OFFICINE MECCANICHE NAVALI E FONDERIE SAN GIORGIO DEL PORTO S.P.A. | GE | 00348160102 | 119.385 | 5.397 |
| MER MEC STE S.R.L. | GE | 11420250968 | 118.311 | 12.807 |
| SOLETO S.P.A. | MI | 10640540158 | 116.920 | 10.474 |
| TOMBOLINI MOTOR COMPANY S.P.A. | MC | 00387980444 | 112.355 | 3.558 |
| ILLUMINA ITALY S.R.L. | MI | 06814140965 | 111.030 | 4.782 |
| CONTEC S.P.A. | FI | 08461361217 | 104.697 | 11.681 |
| TERMOKIMIK CORPORATION IMPIANTI E PROCEDIMENTI INDUSTRIALI S.P.A. | MI | 00753810159 | 100.178 | 1.338 |
| C.Z. HOLDING S.R.L. | MO | 02732390360 | 93.802 | 21.403 |
| ORIENTE S.P.A. | TE | 01023280678 | 93.267 | 2.461 |
| CASCIOLI S.P.A. | TE | 00855510673 | 91.737 | 2.874 |
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