Shareholders as of 31 March 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 | 194,085,924 | 4.86% |
| 5. | Bangkok Life Assurance Public Company Limited | 139,904,800 | 3.51% |
| 6. | Mr. Min Tienworn | 88,000,000 | 2.21% |
| 7. | AIA Company Limited-EQDP-D Fund 1 | 65,742,100 | 1.65% |
| 8. | Mr. Paisan Chartpithuk | 42,000,000 | 1.05% |
| 9. | South East Asia UK (Type C) Nominees Limited | 41,320,120 | 1.04% |
| 10. | Bank of Ayudhya Public Company Limited | 27,894,200 | 0.70% |
| 11. | Dhipaya Insurance Public Company Limited | 24,360,700 | 0.61% |
| 12. | State Street Europe Limited | 23,271,249 | 0.58% |
| 13. | Others | 795,943,507 | 19.95% |