After its formation, OPAL had served many companies in various areas which are listed below. As a matter of business ethics, the names of the clients are not disclosed.

1. Motorcycle and Bicycle Manufacturing Company (human resources and re-structuring consultancy)
2. Food Processing Companies (head hunting, feasibility study, business plan, financial sourcing consultancy)
3. Holding Companies (human resources consultancy and head hunting, project preparation and feasibility study, strategic  management and planning training)
4. Financial Sector Companies including Banks (head hunting, feasibility study and business plan)
5. Foreign Trade Company (human resources consultancy and head hunting)
6. Automotive Companies (company evaluation, sector analysis and assesment)
7. Tire Manufacturing Company (general management and financial consultancy)
8. Textile Companies (head hunting)
9. Shoe Manufacturing Companies including Suppliers and Retailers (human resources consultancy general management, change management and franchising consultancy)
10. Chain of Hypermarkets (head hunting)
11. Holiday Village (general management and change management consultancy)
12. IT Company (research and establishment project)
13. Glassworks, Ceramics, Porcelain Manufacturing Companies (marketing management, general management consultancy and re-engineering)
14. Health Sector Companies (strategic planning, financial and administrative restructuring consultancy, company evaluation)
15. Building Materials Production Company (marketing management consultancy)
16. Publishing and Printing Company (general management and change management consultancy)
17. Internet Service Providing Company (human resources consultancy)
18. Market Research Company (head hunting)
19. Chain of Hypermarkets (acquisition oriented company evaluation)
20. Electronics Company (head hunting)
21. Education Foundation (head hunting)
22. White Goods Production Company (organization and general management consultancy)
23. Cosmetics Company (business plan consultancy)