As of March 13, 2023, 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-Instrument Company Limited 257,227,140 19.72
2. Mr. Tawat Ungsuprasert and spouse 48,539,238 3.72
3. Mr. Apinan Hosaengchai 40,615,100 3.11
4. Mr. Bunchat Ployjirachai 37,744,300 2.89
5. Miss Monthana Janetumnugul 34,481,978 2.64
6. Miss Pimuma Janetumnugul 33,403,550 2.56
7. Miss Parinnee Janetumnugul 29,601,578 2.27
8. Mr. Satja Janetumnugul and spouse 22,734,592 1.74
9. Mr. Napon Janetumnugul 21,400,000 1.64
10. Miss Methanee Sukontharak 20,500,000 1.57