Shareholders as of 30 December 2020
| 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 | 234,211,818 | 5.87% |
| 5. | Bangkok Life Assurance Public Company Limited | 139,904,800 | 3.51% |
| 6. | Mr. Min Tienworn | 82,000,000 | 2.06% |
| 7. | AIA Company Limited-EQDP-D Fund 1 | 65,742,100 | 1.65% |
| 8. | South East Asia UK (Type C) Nominees Limited | 41,775,513 | 1.05% |
| 9. | Mr.Paisan Chartpithuk | 35,000,000 | 0.88% |
| 10. | Dhipaya Insurance Public Company Limited | 24,360,700 | 0.61% |
| 11. | State Street Europe Limited | 22,376,045 | 0.56% |
| 12. | Southeast Life Insurance Public Company Limited | 21,112,800 | 0.53% |
| 13. | Others | 776,038,824 | 19.45% |