Shareholders as of 30 June 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 | 278,269,420 | 6.97% |
| 5. | Bangkok Life Assurance Public Company Limited | 139,904,800 | 3.51% |
| 6. | Mr. Min Tienworn | 78,000,000 | 1.95% |
| 7. | AIA Company Limited-EQDP-D Fund 1 | 65,742,100 | 1.65% |
| 8. | South East Asia UK (Type C) Nominees Limited | 41,012,800 | 1.03% |
| 9. | Mr.Paisan Chartpithuk | 32,300,000 | 0.81% |
| 10. | State Street Europe Limited | 24,929,383 | 0.62% |
| 11. | BBHISL Nominees Limited | 20,391,500 | 0.51% |
| 12. | The Bank of New York (Nominees) Limited | 19,867,000 | 0.50% |
| 13. | Others | 742,105,597 | 18.60% |