| Item | Obligations |
|---|---|
| THE BOEING COMPANY | $9.1B |
| BATTELLE MEMORIAL INSTITUTE | $1.5B |
| BECHTEL NATIONAL, INC. | $1.1B |
| HANFORD TANK WASTE OPERATIONS & CLOSURE, LLC | $787M |
| CENTRAL PLATEAU CLEANUP COMPANY, LLC | $454M |
| FLATIRON-AECON JOINT VENTURE | $320M |
| KIEWIT-ALBERICI SIOP MACC AJV | $290M |
| WHITING-TURNER CONTRACTING COMPANY, THE | $219M |
| AMAZON WEB SERVICES, INC. | $202M |
| PACMED CLINICS | $180M |
THE BOEING COMPANY led all contractors in Washington with $9.1B, 49.2% of the state total.