Shareholders as of December 31, 2016
| No. | List of Shareholders |
Number of Shares |
Shareholding (%) |
| 1. | Mitsui Water Holdings (Thailand) Company Limited | 1,036,500,000 | 25.97 |
| 2. | Bangkok Expressway Public Company Limited | 776,096,900 | 19.45 |
| 3. | H. Karnchang Public Company Limited | 774,077,400 | 19.40 |
| 4. | Thai NVDR Company Limited | 158,797,144 | 3.98 |
| 5. | Bangkok Life Assurance Public Company Limited | 146,036,600 | 3.66 |
| 6. | Mr. Min Tieanworn | 70,000,000 | 1.75 |
| 7. | AIA Company Limited- AIA D-PLUS | 48,349,100 | 1.21 |
| 8. | UOB KAY HIAN PRIVATE LIMITED | 38,000,000 | 0.95 |
| 9. | AIA Company Limited-APEX | 33,939,000 | 0.85 |
| 10. | Mr. Paisarn Chartpitak | 31,400,000 | 0.78 |
| 11. | CIMB-PRINCIPAL ENERGY AND PETROCHEMICAL INDEX FUND | 30,164,000 | 0.75 |
| 12. | Thanachart Prime Low Beta Fund | 28,055,800 | 0.70 |
| 13. | Dhipaya Insurance Public Company Limited | 25,749,400 | 0.64 |
| 14. | STATE STREET BANK EUROPE LIMITED | 21,558,324 | 0.54 |
| 15. | THE BANK OF NEW YORK (NOMINEES) LIMITED A/C 5100 | 21,439,900 | 0.53 |
| 16. | HSBC (SINGAPORE) NOMINEES PTE LTD | 20,397,300 | 0.51 |
| 17. | HSBC (SINGAPORE) NOMINEES PTE LTD | 20,376,650 | 0.51 |