| # | Company name | Role | # of projects |
|---|---|---|---|
| 61 | Carson-Mitchell, Inc. | Construction company | 4 |
| 62 | Carvalho Hosken | Construction company | 99 |
| 63 | Casa Construção | Construction company | 4 |
| 64 | Casa Grande Engenharia | Construction company | 6 |
| 65 | Casablanca Construtora | Construction company | 5 |
| 66 | Casamorada Engenharia | Construction company | 3 |
| 67 | Casbel Incorporações e Construções | Construction company | 2 |
| 68 | Cascade Olympia Construction Co. | Construction company | 1 |
| 69 | Casemiro Pereira Cotta | Construction company | 1 |
| 70 | Casey-Bertram Construction | Construction company | 1 |
| 71 | Casper Buberl | Construction company | 1 |
| 72 | Caspian Service Ltd. | Construction company | 22 |
| 73 | Castel & Fromaget | Construction company | 1 |
| 74 | Castelo Engenharia | Construction company | 9 |
| 75 | Castro Neves Construtora | Construction company | 4 |
| 76 | Castroveijo Construtora | Construction company | 1 |
| 77 | Catabas | Construction company | 9 |
| 78 | Catalfumo Construction and Development Inc. | Construction company | 34 |
| 79 | Catioca Construtora Ltda | Construction company | 3 |
| 80 | Caucaso Construtora | Construction company | 9 |