| # | Company name | Role | # of projects |
|---|---|---|---|
| 581 | Bird Construction Company Ltd. | Construction company | 6 |
| 582 | Birdwell Finlayson | Construction company | 1 |
| 583 | Birmann | Construction company | 17 |
| 584 | BIS Bau und Installationsservice GmbH | Construction company | 1 |
| 585 | Biskon | Construction company | 1 |
| 586 | Bittencourt Empreendimentos | Construction company | 12 |
| 587 | Bitti S.A. | Construction company | 1 |
| 588 | Bituminous Roadways, Inc. | Construction company | 0 |
| 589 | Biwell Construction Company | Construction company | 0 |
| 590 | BKO Engenharia e Comércio | Construction company | 55 |
| 591 | Blaine Construction Corporation | Construction company | 5 |
| 592 | Bland Engineering Company | Construction company | 1 |
| 593 | Blenheim House Construction Ltd. | Construction company | 0 |
| 594 | Blokos Engenharia Ltda | Construction company | 33 |
| 595 | Blokus Engenharia LTDA | Construction company | 8 |
| 596 | Bloomfield Construction, Inc. | Construction company | 1 |
| 597 | Blosam Contractors | Construction company | 2 |
| 598 | Blues Simon Group SL | Construction company | 1 |
| 599 | BM van Houwelingen | Construction company | 1 |
| 600 | BMC Bahia Melhoramentos Construções e Empreendimentos Ltda | Construction company | 1 |