| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:10.11 | 2026 Mallards Winter LC Invitational | 2026-01-30 |
| 100m Backstroke | 1:06.60 | 2025 Alex Baumann Invitational | 2025-11-21 |
| 100m Breaststroke | 1:13.91 | 2026 Mallards Winter LC Invitational | 2026-01-30 |
| 100m Breaststroke | 1:12.07 | RHAC Fall Classic 2025 | 2025-10-24 |
| 100m Butterfly | 1:10.78 | 2025 Age Group International LC | 2025-06-05 |
| 100m Butterfly | 1:05.10 | 2025 Alan Swanston Classic | 2025-12-05 |
| 100m Freestyle | 57.41 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 100m Freestyle | 56.69 | 2025 Alan Swanston Classic | 2025-12-05 |
| 200m Backstroke | 2:35.30 | 2025 Central Region Div 1 LC Championships | 2025-06-20 |
| 200m Backstroke | 2:26.46 | 2025 RHAC Summer League | 2025-07-18 |
| 200m Breaststroke | 2:44.87 | 2026 Mallards Winter LC Invitational | 2026-01-30 |
| 200m Breaststroke | 2:44.42 | RHAC Fall Classic 2025 | 2025-10-24 |
| 200m Butterfly | 2:38.60 | RHAC Fall Classic 2025 | 2025-10-24 |
| 200m Freestyle | 2:18.59 | 2025 Age Group International LC | 2025-06-05 |
| 200m Freestyle | 2:03.93 | 2025 MSSAC Open | 2025-12-19 |
| 200m IM | 2:35.52 | 2025 Age Group International LC | 2025-06-05 |
| 200m IM | 2:19.99 | 2025 Alan Swanston Classic | 2025-12-05 |
| 400m Freestyle | 4:51.74 | 2025 Central Region Div 1 LC Championships | 2025-06-20 |
| 400m Freestyle | 4:31.56 | RHAC Fall Classic 2025 | 2025-10-24 |
| 400m IM | 5:02.67 | 2026 Central Region Div 1 SC Championships | 2026-02-06 |
| 50m Backstroke | 32.36 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 50m Backstroke | 30.84 | 2025 Alex Baumann Invitational | 2025-11-21 |
| 50m Breaststroke | 33.05 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 50m Breaststroke | 32.47 | 2025 Alan Swanston Classic | 2025-12-05 |
| 50m Butterfly | 28.65 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 50m Butterfly | 28.89 | MAC Fall Fest Invitational | 2025-10-18 |
| 50m Freestyle | 26.09 | 2026 Ontario Age Groups - MPAC | 2026-03-05 |
| 50m Freestyle | 25.60 | 2025 Alan Swanston Classic | 2025-12-05 |
| 800m Freestyle | 10:11.72 | 2025 Central Region Div 1 LC Championships | 2025-06-20 |
| 800m Freestyle | 9:14.63 | 2025 MSSAC Open | 2025-12-19 |
Parkhomenko, Oscar's top personal bests include 100m Backstroke (1:10.11), 100m Backstroke (1:06.60), 100m Breaststroke (1:13.91), 100m Breaststroke (1:12.07), 100m Butterfly (1:10.78).
Parkhomenko, Oscar swims for Aurora Ducks Swimming Club.
Parkhomenko, Oscar has competed in 13 meets.