NAICS Codes
| Codes listed under both the Anchorage headquarters and the Minot office: | |
| Industrial Building Construction | 236210 |
| Commercial & Institutional Building Construction | 236220 |
| Water & Sewer Line & Related Structures Construction | 237110 |
| Oil & Gas Pipeline & Related Structures Construction | 237120 |
| Power & Communication Line & Related Structures Construction | 237130 |
| Other Heavy and Civil Engineering Construction | 237990 |
| All Other Specialty Trade Contractors | 238990 |
| Pipeline Transportation of Crude Oil | 486110 |
| Marine Cargo Handling | 488320 |
| General Warehousing and Storage | 493110 |
| Cellular and Other Wireless Telecommunications | 517212 |
| Telecommunications Resellers | 517310 |
| Engineering Services | 541330 |
| Codes listed only under the Anchorage, Alaska office: | |
| Logging | 113310 |
| Support Activities for Forestry | 115310 |
| Satellite Telecommunications | 517410 |
| Testing Laboratories | 541380 |
| Administrative Management & General Management Consulting Services | 541611 |
| Facilities Support Services | 561210 |
| Remediation Services | 562910 |
| Codes listed only under the Minot, North Dakota office: | |
| Electrical Contractors | 238210 |
| Plumbing, Heating & Air-Conditioning Contractors | 238220 |
| Site Preparation Contractors | 238910 |
| Port & Harbor Operations | 488310 |
| Packing & Crating | 488991 |
| All Other Support Activities for Transportation | 488999 |
| Lessors of Other Real Estate Property | 531190 |