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| Date | Meet | Equipment | Squat (kg) | Bench (kg) | Deadlift (kg) | Total (kg) | DOTS |
|---|---|---|---|---|---|---|---|
| 2018-11-24 | European Classic Powerlifting Championships | Raw | 165 | 112.5 | 212.5 | 490 | 385.01 |
| 2019-06-04 | World Classic Powerlifting Championships | Raw | 160 | 120 | — | — | — |
| 2019-10-20 | Belgisch Kampioenschap - Championnats de Belgique - Bench Press - Classic | Raw | — | 120 | — | — | 87.26 |
| 2019-11-29 | European Classic Powerlifting Championships | Raw | 180 | 132.5 | 240 | 552.5 | 434.37 |
| 2021-06-13 | Vriendschappelijke Wedstrijd HNS/KKL/GG16 | Single-ply | 210 | 165 | 260 | 635 | 457.92 |
| 2021-08-03 | European Open Juniors & Sub-Juniors Powerlifting Championships | Single-ply | 217.5 | 170 | 260 | 647.5 | 470.22 |
| 2021-09-03 | Western European Powerlifting Championships | Single-ply | 220 | 175 | 265 | 660 | 478.62 |
| 2021-10-31 | Highway to Hell - Benefietwedstrijd tvv De Cliniclowns | Raw | 180 | 145 | 260 | 585 | 406.41 |
| 2021-12-03 | European Classic Powerlifting Championships | Raw | 180 | 135 | 255 | 570 | 412.66 |
| 2022-05-03 | European Powerlifting Championships | Single-ply | — | 165 | 272.5 | — | — |
| 2022-06-25 | Belgisch Club Kampioenschap - Championnats de Belgique des Clubs - Powerlifting | Single-ply | 255 | 200 | 275 | 730 | 499.37 |
| 2022-08-27 | World Junior Equipped Powerlifting Championships | Single-ply | 245 | 185 | 265 | 695 | 470.47 |
| 2022-12-17 | Benelux Open Powerlifting Tournament | Single-ply | 215 | 175 | 270 | 660 | 468.96 |
| 2023-05-02 | European Equipped Powerlifting Championships | Single-ply | — | 185 | 280 | — | — |
| 2023-08-24 | World Junior and Sub-Junior Equipped Championships | Single-ply | 245 | 207.5 | 292.5 | 745 | 504.45 |
| 2023-12-10 | Belgisch Kampioenschap - Championnats de Belgique - Bench Press: Classic & Equipped - Powerlifting: Equipped | Single-ply | 260 | 205 | 260 | 725 | 516.64 |
| 2024-01-07 | Grand Prix de Beauvais | Raw | 202.5 | 147.5 | 285 | 635 | 462.38 |
| 2024-03-12 | European Open Classic Powerlifting Championships | Raw | 175 | 152.5 | 285 | 612.5 | 443.24 |
| 2024-05-07 | European Open Junior and Sub-Junior Equipped Powerlifting Championships | Single-ply | 260 | 190 | 285 | 735 | 533.86 |
| 2024-08-28 | World Junior and Sub-Juniors Powerlifting Championships | Single-ply | 240 | 202.5 | 297.5 | 740 | 535.97 |
| 2025-05-02 | European Equipped Open & Juniors Powerlifting Championship | Single-ply | 255 | 200 | 272.5 | 727.5 | 528.04 |
| 2025-11-10 | World Open Equipped Powerlifting Championships | Single-ply | 245 | 212.5 | 282.5 | 740 | 535.74 |
Grégory Ostyn's career best to date is 745 kg, set in 2023 at age 22. Their total grew 255 kg over 4.7 years between their first meet and that mark (~53.7 kg/year).
Career-best meet: World Junior and Sub-Junior Equipped Championships · IPF
vs Single-ply · 74 kg class · open · Belgium · drug-tested
vs Single-ply · 74 kg class · open · drug-tested
vs Single-ply · 83 kg class · junior · drug-tested