As of April 29, 2022, the list of top ten shareholders including related persons as specified in Section 258 of the Securities Act B.E. 2535 is as follows:

Names of Shareholders Number of shares %
1. Petro-Instruments Corp. Ltd. 257,227,140 19.72
2. Mr. Tawat Ungsuprasert and Spouse 48,539,238 3.72
3. Mr. Apinan Horsangchai 45,600,000 3.50
4. Ms. Montana Janetumnugul 34,481,978 2.64
5. Ms. Pimuma Janetumnugul 30,642,850 2.35
6. Ms. Prinnee Janetumnugul 29,601,578 2.27
7. Thai NVDR Company Limited 28,767,397 2.20
8. Mr. Satja Janetumnugul and Spouse 22,734,592 1.74
9. Ms. Matanee Sukontarug 20,500,000 1.57
10. Mr. Krit Jaroonsrirat 16,800,000 1.29