Shareholders as of 30 September 2021
| No. | List of Shareholders | Number of Shares | Shareholding (%) |
|---|---|---|---|
| 1. | Mitsui Water Holdings (Thailand) Company Limited | 1,036,500,000 | 25.98% |
| 2. | CH. Karnchang Public Company Limited | 774,077,400 | 19.40% |
| 3. | Bangkok Expressway and Metro Public Company Limited | 736,900,000 | 18.47% |
| 4. | Thai NVDR | 205,800,838 | 5.16% |
| 5. | Bangkok Life Assurance Public Company Limited | 122,174,200 | 3.06% |
| 6. | Mr. Min Tienworn | 90,000,000 | 2.26% |
| 7. | South East Asia UK (Type C) Nominees Limited | 44,401,800 | 1.11% |
| 8. | Mr. Paisan Chartpithuk | 43,000,000 | 1.08% |
| 9. | Bank of Ayudhya Public Company Limited | 28,754,200 | 0.72% |
| 10. | State Street Europe Limited | 25,336,371 | 0.63% |
| 11. | Dhipaya Insurance Public Company Limited | 24,360,700 | 0.61% |
| 12. | South East Life Insurance Public Company Limited | 20,316,000 | 0.51% |
| 13. | Others | 838,378,491 | 21.01% |