A successful rider in Australia, he came to England and first rode for
Plymouth Devils in 2015. He was part of the Plymouth team that won the
Premier League Four-Team Championship, which was held on 23 and 24 July 2016, at the
East of England Arena. After two seasons, he rode for both
Peterborough Panthers and
Poole Pirates in 2017, helping Poole to win the Elite Shield. Jack Holder finished in sixth place at the
2017 Speedway Under-21 World Championship and 4th in the
Jason Crump Classic Cup - considered a warm-up for the Australian Senior Solo Championship. The Boxing Day event (2018) was held in front of more than 2,500 fans and he rode through to the B Final where he beat
Jye Etheridge, Mason Campton and
Erik Riss and went through to the A Final. However, he finished at the back, while the race was won by older brother
Chris Holder. In 2018, he helped
Somerset Rebels win the
KO Cup. In 2019, he started the season as number 1 for Poole Pirates but had a shaky start, and his friend and co-rider
Brady Kurtz asked fans to be patient while he settled in. “I am sure Jack’s copped enough off social media and everything. He doesn’t need me asking him about it as well. Everyone just needs to let him get on with it – he’s just a kid, let him race his bike!" In 2021 and 2022, he rode for the
Sheffield Tigers in the
SGB Premiership 2021 and
SGB Premiership 2022. He helped Sheffield win the 2022 League cup and reach the Play off final. Also in 2022, he competed in every round of the
2022 Speedway Grand Prix and scored 12 points at the British Grand Prix, he eventually finished in 12th place during the 2022
Speedway World Championship, after securing 67 points. He qualified for the
2023 Speedway Grand Prix by virtue of finishing 3rd in the
2023 Speedway Grand Prix Qualification. However, the highlight of his season was winning the
2022 Speedway of Nations for Australia with
Max Fricke. In December, he won his fifth successive
New South Wales Individual Speedway Championship. In January 2023, Holder won the
Australian Championship for the first time. In 2023, he was part of the Australian team that finished fourth in the
2023 Speedway World Cup final. He completed a career best finish of fourth in the
2023 Speedway Grand Prix but would have finished even higher had it not been for a hand injury suffered during the Swedish round, which forced him to sit out the Latvian round. On the domestic front he helped Sheffield win the 2023 league title After re-signing for Sheffield for 2024 he recorded the first Grand Prix win of his career, winning the opening round in Croatia. In 2024, he also helped Australia secure a silver medal at the
2024 Speedway of Nations in Manchester and won the
Knockout Cup with Sheffield. Also in 2024, he helped Lublin win the Ekstraliga during the
2024 Polish speedway season and won the NSW title for the sixth successive year. In 2025 he won a second Grand Prix and finished fifth in the
World Championship. He finished his season on a high, winning the
2025 Speedway of Nations (his second
World team championship). Holder won the
Australian title for the second time after claiming all four rounds. == Major results ==