| # | Company name | Role | # of projects |
|---|---|---|---|
| 581 | Blaine Construction Corporation | Construction company | 5 |
| 582 | Bland Engineering Company | Construction company | 1 |
| 583 | Blenheim House Construction Ltd. | Construction company | 0 |
| 584 | Blokos Engenharia Ltda | Construction company | 33 |
| 585 | Blokus Engenharia LTDA | Construction company | 8 |
| 586 | Bloomfield Construction, Inc. | Construction company | 1 |
| 587 | Blosam Contractors | Construction company | 2 |
| 588 | Blues Simon Group SL | Construction company | 1 |
| 589 | BM van Houwelingen | Construction company | 1 |
| 590 | BMC Bahia Melhoramentos Construções e Empreendimentos Ltda | Construction company | 1 |
| 591 | BMS Briloner Montage- und Schlüsselfertigbau GmbH | Construction company | 0 |
| 592 | BMV | Construction company | 2 |
| 593 | Boa Viagem 5 | Construction company | 2 |
| 594 | Boa Vista Construtora e Incorporadora Ltda. | Construction company | 5 |
| 595 | Boak & Sons, Inc. | Construction company | 1 |
| 596 | Böcker Industriebau GmbH | Construction company | 0 |
| 597 | Boetsch S.A. | Construction company | 25 |
| 598 | Boffo Construction Group Inc. | Construction company | 1 |
| 599 | Boh Brothers Construction Company | Construction company | 2 |
| 600 | BOKX woningbouw BV | Construction company | 2 |