| # | Company name | Role | # of projects |
|---|---|---|---|
| 1 | K & H Excavating | Construction company | 1 |
| 2 | K.B.A Ashdod Ltd. | Construction company | 6 |
| 3 | K.M. Knight Construction Co. | Construction company | 2 |
| 4 | Kabuki Construction Co.,Ltd. | Construction company | 2 |
| 5 | Kadean Construction Company | Construction company | 7 |
| 6 | Kagata Corporation | Construction company | 3 |
| 7 | Kaiser-Ducett | Construction company | 2 |
| 8 | Kajima Construction Europe (UK) Ltd. | Construction company | 0 |
| 9 | Kajima Corporation | Construction company | 677 |
| 10 | KAJITA Corporation | Construction company | 2 |
| 11 | Kalash Mordehai Development & Construction Ltd. | Construction company | 1 |
| 12 | Kallas Engenharia | Construction company | 23 |
| 13 | Kalmar Construction Ltd. | Construction company | 1 |
| 14 | Kalnozols celtnieciba | Construction company | 5 |
| 15 | Kalpana Struct-Con Pvt. Ltd. | Construction company | 4 |
| 16 | Kalpataru Construction Pvt. Ltd. | Construction company | 85 |
| 17 | Kamito Gumi | Construction company | 1 |
| 18 | Kamskaya Dolina | Construction company | 38 |
| 19 | Kanakia Group | Construction company | 40 |
| 20 | Kanayama General Constructor | Construction company | 1 |