- 541611 – Administrative and General Management Consulting Services
- 541612 – Human Resources Consulting Services
- 541613 – Marketing Consulting Services
- 541618 – Other Marketing Consulting Services
- 541990 – All Other Professional, Scientific and Technical Services
- 541199 – All Other Legal Services
- 561110 – Office Administrative Services
- 561312 – Executive Search Services
- 561320 – Temporary Help Services
- 561410 – Document Preparation Services
- 561499 – All Other Business Support Services
- 561920 – Convention and Trade Show Organizers
- 611430 – Professional and Management Development Training
- 611710 – Education Support Services
