| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:11.16 | GMAC Dash for Cash | 2025-12-05 |
| 100m Breaststroke | 1:14.23 | Western Region Short Course Championships | 2026-02-12 |
| 100m Butterfly | 1:15.28 | LAC - Nothers Fall Invitational | 2025-11-21 |
| 100m Freestyle | 1:01.13 | Western Region Short Course Championships | 2026-02-12 |
| 100m IM | 1:10.74 | GMAC Dash for Cash | 2025-12-05 |
| 200m Backstroke | 2:34.33 | Western Region Short Course Championships | 2026-02-12 |
| 200m Breaststroke | 2:42.64 | Western Region Short Course Championships | 2026-02-12 |
| 200m Freestyle | 2:15.80 | Western Region Short Course Championships | 2026-02-12 |
| 200m IM | 2:44.28 | GMAC Rocks the Blocks | 2025-10-25 |
| 400m Freestyle | 4:50.27 | Western Region Short Course Championships | 2026-02-12 |
| 400m IM | 5:38.63 | LAC - Nothers Fall Invitational | 2025-11-21 |
| 50m Backstroke | 32.67 | LAC - Nothers Fall Invitational | 2025-11-21 |
| 50m Breaststroke | 34.94 | Western Region Short Course Championships | 2026-02-12 |
| 50m Butterfly | 32.23 | BAC SC Fall Invitational | 2025-11-07 |
| 50m Freestyle | 28.74 | LAC - Nothers Fall Invitational | 2025-11-21 |
| 800m Freestyle | 10:32.05 | LAC - Nothers Fall Invitational | 2025-11-21 |
O'Neil, Jack's top personal bests include 100m Backstroke (1:11.16), 100m Breaststroke (1:14.23), 100m Butterfly (1:15.28), 100m Freestyle (1:01.13), 100m IM (1:10.74).
O'Neil, Jack swims for Guelph Marlin Aquatic Club.
O'Neil, Jack has competed in 8 meets.