Top personal bests across all competitions
| # | Name | Team | Age | Time | Date |
|---|---|---|---|---|---|
| 1 | Cheuk, Ming Ho CPS · 18 | CPS | 18 | 3:50.53 | 2021-04-18 |
| 2 | Lai, King Wo |
| WTS |
| 18 |
| 3:56.71 |
| 2025-08-18 |
| 3 | Kwan, Nicholas TPS · 16 | TPS | 16 | 3:58.69 | 2024-07-15 |
| 4 | Lau, Chor Tik WTS · 16 | WTS | 16 | 3:59.90 | 2026-04-13 |
| 5 | Wang, Yi Shun CPS · 16 | CPS | 16 | 3:59.96 | 2024-11-18 |
| 6 | He, Shing Ip CPS · 17 | CPS | 17 | 4:00.27 | 2023-04-17 |
| 7 | Chen, Eric Q HIS · 16 | HIS | 16 | 4:00.79 | 2026-04-13 |
| 8 | So, Kwun Wa WDA · 17 | WDA | 17 | 4:01.69 | 2025-04-14 |
| 9 | Liao, Xian Hao Jonathan HJC · 17 | HJC | 17 | 4:01.95 | 2016-04-18 |
| 10 | Ip, Ali TPS · 16 | TPS | 16 | 4:02.43 | 2024-07-15 |
| 11 | Wong, Kaden Lok Fung HTA · 16 | HTA | 16 | 4:02.63 | 2025-08-18 |
| 12 | Chan, Chun Hei JHC · 20 | JHC | 20 | 4:03.97 | 2017-04-18 |
| 13 | Wong, Ming Hong HTA · 16 | HTA | 16 | 4:04.21 | 2017-04-18 |
| 14 | Lam, Chak Hang HVA · 17 | HVA | 17 | 4:05.06 | 2018-11-05 |
| 15 | Williams, Miles Jing SCA · 17 | SCA | 17 | 4:05.07 | 2015-01-09 |
| 16 | Tsang, Pak Kiu SYS · 15 | SYS | 15 | 4:05.12 | 2025-11-03 |
| 17 | Kwok, Chun Hei HTA · 17 | HTA | 17 | 4:05.14 | 2021-04-18 |
| 18 | Sun, Maokun WTS · 13 | WTS | 13 | 4:05.82 | 2025-08-18 |
| 19 | Chi, Oscar DLS · 18 | DLS | 18 | 4:06.27 | 2017-11-06 |
| 20 | Chan, Wai Ching Adrian HTA · 14 | HTA | 14 | 4:06.61 | 2024-11-18 |
| 21 | Zhu, Xiuping PSC · 16 | PSC | 16 | 4:06.64 | 2025-07-30 |
| 22 | Lo, Tsz Lam WTS · 18 | WTS | 18 | 4:06.66 | 2025-07-30 |
| 23 | Whittington, Peter Harry DLS · 17 | DLS | 17 | 4:07.13 | 2021-06-02 |
| 24 | Chan, James Gavin HVA · 18 | HVA | 18 | 4:07.30 | 2019-01-14 |
| 25 | Lim Nicholas, Owen Zhaoguang HIS · 16 | HIS | 16 | 4:07.46 | 2017-11-06 |