Shareholders as of 31 March 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 | 279,245,441 | 7.00% |
| 5. | Bangkok Life Assurance Public Company Limited | 139,904,800 | 3.51% |
| 6. | Mr. Min Tienworn | 74,506,700 | 1.87% |
| 7. | AIA Company Limited-EQDP-D Fund 1 | 65,742,100 | 1.65% |
| 8. | South East Asia UK (Type C) Nominees Limited | 42,362,100 | 1.06% |
| 9. | Mr.Paisan Chartpithuk | 32,000,000 | 0.80% |
| 10. | The Bank of New York (Nominees) Limited | 27,165,300 | 0.68% |
| 11. | State Street Bank and Trust Company | 26,573,607 | 0.67% |
| 12. | The Bank of New York (Nominees) Limited | 21,165,200 | 0.53% |
| 13. | Others | 733,857,352 | 18.39% |