| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:13.02 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
| 100m Breaststroke | 1:22.73 | June Performance Meet 2025 | 2025-06-06 |
| 100m Breaststroke | 1:18.01 | Gus Ryder Memorial Cup 2025 | 2025-11-07 |
| 100m Butterfly | 1:16.53 | June Performance Meet 2025 | 2025-06-06 |
| 100m Butterfly | 1:11.26 | 2026 Steve Kingston Memorial | 2026-03-06 |
| 100m Freestyle | 1:02.59 | 2025 Central Region Div 2 LC Championships | 2025-06-13 |
| 100m Freestyle | 1:00.70 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
| 200m Breaststroke | 3:12.16 | June Performance Meet 2025 | 2025-06-06 |
| 200m Breaststroke | 3:02.27 | Border City Invitational 2025 | 2025-12-05 |
| 200m Freestyle | 2:21.94 | 2025 Central Region Div 2 LC Championships | 2025-06-13 |
| 200m Freestyle | 2:17.45 | Border City Invitational 2025 | 2025-12-05 |
| 200m IM | 2:42.50 | 2025 Central Region Div 2 LC Championships | 2025-06-13 |
| 200m IM | 2:34.58 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
| 400m Freestyle | 5:02.36 | Border City Invitational 2025 | 2025-12-05 |
| 400m IM | 5:32.79 | 2026 Steve Kingston Memorial | 2026-03-06 |
| 50m Backstroke | 34.15 | 2025 Downtown Sprint Meet | 2025-10-25 |
| 50m Breaststroke | 36.69 | June Performance Meet 2025 | 2025-06-06 |
| 50m Breaststroke | 35.38 | 2026 Steve Kingston Memorial | 2026-03-06 |
| 50m Butterfly | 32.93 | June Performance Meet 2025 | 2025-06-06 |
| 50m Butterfly | 30.85 | 2026 Steve Kingston Memorial | 2026-03-06 |
| 50m Freestyle | 29.11 | 2025 Central Region Div 2 LC Championships | 2025-06-13 |
| 50m Freestyle | 27.96 | Border City Invitational 2025 | 2025-12-05 |
Siemiatycki, Oliver's top personal bests include 100m Backstroke (1:13.02), 100m Breaststroke (1:22.73), 100m Breaststroke (1:18.01), 100m Butterfly (1:16.53), 100m Butterfly (1:11.26).
Siemiatycki, Oliver swims for Toronto Swim Club.
Siemiatycki, Oliver has competed in 9 meets.