| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:37.80 | 2026 Stingrays Annual Spring Break Invitational | 2026-03-06 |
| 100m Breaststroke | 1:58.38 | 2025 CRKW Eliminator-Invitational | 2025-11-29 |
| 100m Freestyle | 1:30.75 | 2026 Stingrays Annual Spring Break Invitational | 2026-03-06 |
| 100m IM | 1:44.49 | 2025 CRKW Eliminator-Invitational | 2025-11-29 |
| 200m Butterfly | 3:58.39 | NRST Spring Break Time Trial | 2026-03-13 |
| 200m Freestyle | 3:42.75 | Rubber Ducky #1 | 2025-11-02 |
| 200m IM | 4:03.54 | 12 & Under Jamboree | 2025-05-10 |
| 400m Freestyle | 6:50.53 | 2026 Stingrays Annual Spring Break Invitational | 2026-03-06 |
| 400m IM | 7:31.80 | NRST Spring Break Time Trial | 2026-03-13 |
| 50m Backstroke | 46.90 | 2026 Stingrays Annual Spring Break Invitational | 2026-03-06 |
| 50m Breaststroke | 52.09 | 2026 Stingrays Annual Spring Break Invitational | 2026-03-06 |
| 50m Butterfly | 50.35 | 2025 CRKW Eliminator-Invitational | 2025-11-29 |
| 50m Freestyle | 40.75 | 2026 Stingrays Annual Spring Break Invitational | 2026-03-06 |
Gregson, Olivia's top personal bests include 100m Backstroke (1:37.80), 100m Breaststroke (1:58.38), 100m Freestyle (1:30.75), 100m IM (1:44.49), 200m Butterfly (3:58.39).
Gregson, Olivia swims for Nanaimo Riptides Swim Team.
Gregson, Olivia has competed in 6 meets.