is a Japanese racing driver who last competed for TF Sport in the LMGT3 class of the European Le Mans Series.

Career Early beginnings and National Japanese F3 title (2004–2015) Koizumi made his car-racing debut in 2004, racing in the Honda Integra Kanto Series, where he took a best result of second in the second round. The following year, he switched to Super Taikyu, racing in the ST-3 class for Tomei Sports alongside Akira Yoshitomi. Finishing sixth in class on debut at Sendai, Koizumi took his best result of the season at the following round at Suzuka despite incurring a ten-second penalty. Having completed four of the eight races in the Super Taikyu schedule, Koizumi and Tomei Sports finished 11th in the ST-3 standings. During 2005, Koizumi also raced in the Suzuka 1000 km for Gaikoku-ya Advan Porsche in the GT300 class. On his GT300 debut, Koizumi finished third in class and sixth overall.

After racing in Formula Toyota in 2006, Koizumi returned to GT300 competition in 2007 by joining Team Gaikokuya in Super GT. Koizumi competed in Super GT on a near-full-time basis until 2011, during which he scored a best result of seventh at the 2010 Pokka GT Summer Special. After concentrating on Japanese Formula 3, Koizumi returned to Super GT in 2015, joining apr alongside Yuki Iwasaki. Completing his first full season in Super GT competition with apr, Koizumi took two 13th-place results as best finishes across the eight-race season in both the season-opener at Okayama and Suzuka.

Returning to single-seaters in 2009, Koizumi joined CMS Motor Sports Project in the National class of the Japanese Formula 3 Championship. Following two seasons with CMS, Koizumi switched to Hanashima Racing, with whom he'd clinch the National class title in 2014 after winning eight of the 15 races. During his five-year tenure in F3, Koizumi also won the 2013 3 Hours of Fuji as he made a one-off appearance in the LMP2 class of the Asian Le Mans Series for KCMG.

Return to racing and international debut (2022–)

Following a seven-year hiatus, Koizumi returned to racing in 2022, joinning ABSSA Motorsport in GT World Challenge Asia alongside Keita Sawa. Taking a best result of fourth in race one at the season-ending Okayama round, the pair ended the season 12th overall and eighth in the Pro-Am standings. At the end of 2022, Koizumi joined AF Corse to make his debut at the final round of the Michelin Le Mans Cup in the GT3 class alongside Kei Cozzolino. The duo started third and held off Jan Magnussen in the closing stages to win on debut.

Returning to AF Corse for 2023, Koizumi raced in the Michelin Le Mans Cup on a full-time basis, alongside Kei Cozzolino marking his first season outside of Japan. The pair finished third in the season-opening round at Barcelona, before winning the penultimate round of the season in Aragón and finishing runner-up in the standings to Racing Spirit of Léman. During 2023, Koizumi also made his WEC debut, racing in at the penultimate round of the season at Fuji alongside Simon Mann and Kei Cozzolino. Qualifying fifth but later getting his time deleted on debut, Koizumi finished his first WEC race in 12th.

In 2024, Koizumi joined TF Sport to make his full-time WEC debut in the LMGT3 class alongside Daniel Juncadella and Sébastien Baud. At Losail, Koizumi qualified 11th, and despite a drive-through penalty for Juncadella for violating track limits later in the race, was able to finish tenth to take his first points in the series. At the penultimate round of the season at Fuji, Koizumi advanced to hyperpole and qualified seventh in LMGT3. In the race, Koizumi ran sixth before his race was ended after his car didn't start following a pit stop. In the final race of the season in Bahrain, Koizumi took his maiden WEC podium by finishing third, which helped him finish 14th in the driver's standings.

Koizumi remained with TF Sport for 2025, albeit switching to the European Le Mans Series, alongside Rui Andrade and Charlie Eastwood. In their first season together, the trio won at Imola and Algarve, as well as standing on the podium at Silverstone, en route to the LMGT3 title at season's end.

Racing record Racing career summary SeasonSeriesTeamRacesWinsPolesF/LapsPodiumsPointsPosition 2004Integra Kanto Series ?? ?? ?? ?? 1 ?? ??2005Super Taikyu – ST-3Tomei Sports 4 0 0 0 1 26‡ 11th‡Suzuka 1000 km – GT300Gaikoku-ya Advan Porsche 1 0 0 0 1 N/A 3rd 2006Formula ToyotaBomex Casval FT 8 0 0 0 0 0 13th2007Super GT – GT300Team Gaikokuya 4 0 0 0 00NCArktech Motorsports 3 0 0 0 0 2008Super GT – GT300Arktech Motorsports 8 0 0 0 0 3 30th2009Super GT – GT300Tomei Sports 7 0 0 0 0 0 NCJapanese Formula 3 Championship – NationalCMS Motor Sports Project 8 0 0 0 0 1 11th2010Super GT – GT300LMP Motorsport 7 0 0 0 0 10 15thJapanese Formula 3 Championship – NationalCMS Motor Sports Project 6 0 0 0 0 0 14th2011Super GT – GT300Team Taisan 5 0 0 0 0 4 19thJapanese Formula 3 Championship – NationalHanashima Racing 3 0 0 0 0 1 9th 2012Japanese Formula 3 Championship – NationalHanashima Racing 15 0 0 0 1 23 6th2013Asian Le Mans Series – LMP2KCMG 1 1 0 0 1 25 8thJapanese Formula 3 Championship – NationalHanashima Racing 15 0 0 0 8 503rd 2014Japanese Formula 3 Championship – NationalHanashima Racing 15 8 6 8 12 1241st 2015Super GT – GT300apr 8 0 0 0 0 0 NC2022GT World Challenge Asia – GT3 Pro-AmABSSA Motorsport 8 0 0 0 1 61 8thSuper Taikyu – ST-XMP Racing 1 0 0 0 0 35‡ 8th‡Le Mans Cup – GT3AF Corse 1 1 0 0 1 25 11th2023Le Mans Cup – GT3AF Corse 7 1 0 0 2 772ndFIA World Endurance Championship – LMGTE Am 1 0 0 0 0 0 31st 2024FIA World Endurance Championship – LMGT3TF Sport 8 0 0 0 1 37 14th 2025 European Le Mans Series – LMGT3 TF Sport 6 2 1 0 3 781stSources: ‡ Team standings

Complete Super GT results (key) (Races in bold indicate pole position) (Races in italics indicate fastest lap) Year Team Car Class 1 2 3 4 5 6 7 8 9 DC Pts2007 Team Gaikokuya Porsche 996 GT3-RSGT300SUZOKAFUJSEPSUGSUZNC0 Arktech Motorsports Porsche 986 BoxsterMOTAUTFUJ 2008 Arktech Motorsports Porsche 986 Boxster GT300SUZOKAFUJSEPSUGSUZMOTAUTFUJ 30th 3 2009 Tomei Sports Porsche 996 GT3-RSR GT300OKASUZFUJSEPSUGSUZFUJ AUTMOT 14th 12 2010 LMP Motorsport Ferrari F430 GT300SUZOKAFUJSEPSUGSUZFUJMOT 15th 10 2011 Team Taisan Cinecitta Ferrari F430 GT300OKAFUJ SEPSUGSUZFUJ AUTMOT 19th 4 2015 apr Nissan GT-R GT3 GT300OKAFSWCHAFSWSUZSUGAUTTRM NC 0

Complete Japanese Formula 3 results (key) (Races in bold indicate pole position) (Races in italics indicate fastest lap) Year Team Engine Class 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 DC Pts 2009 CMS Motor Sports Project Toyota N FUJ1 FUJ2 OKA17 OKA26 SUZ18 SUZ2Ret FUJ1 FUJ2 SUZ18 SUZ27 MOT1 MOT2 AUT17 AUT28 SUG1 SUG2 11th 1 2010 N SUZ114 SUZ215 MOT1 MOT2 FUJ1 FUJ2 FUJ115 FUJ215 MOT115 MOT2Ret OKA1 OKA2 SUG1 SUG2 AUT1 AUT2 14th 0 2011Hanashima Racing N SUZ1 SUZ2 FUJ1 FUJ2 FUJ3 FUJ1 FUJ2 MOT1 MOT2 OKA1 OKA2 SUZ1 SUZ2 SUG1 SUG2 SUG3 9th 1 2012 N SUZ1Ret SUZ211 MOT112 MOT212 FUJ111 FUJ28 MOT112 MOT211 OKA112 OKA211 SUG111 SUG211 SUG310 FUJ112 FUJ210 6th 23 2013 N SUZ1Ret SUZ29 MOT110 MOT210 MOT310 OKA110 OKA2DNS FUJ19 FUJ28 MOT1Ret MOT29 SUG17 SUG28 FUJ19 FUJ283rd50 2014 N SUZ110 SUZ211 MOT110 MOT29 MOT311 OKA19 OKA28 FUJ1110 FUJ127 MOT18 MOT210 SUG1NC SUG211 FUJ219 FUJ2210 1st 124

Complete Asian Le Mans Series results (key) (Races in bold indicate pole position) (Races in italics indicate fastest lap) +YearTeamClassCarEngine1234Pos.Points 2013 KCMG LMP2 Morgan LMP2 Nissan VK45DE 4.5 L V8 INJ FUJ ZHU SEP8th25 * Season still in progress.

Complete GT World Challenge Asia results (key) (Races in bold indicate pole position) (Races in italics indicate fastest lap) Year Team Car Class 1 2 3 4 5 6 7 8 9 10 DC Points 2022 ABSSA Motorsport McLaren 720S GT3 GT3 Pro-Am BUR1 BUR2 FSW1 FSW2 SUZ1 SUZ2 SUG1 SUG2 OKA1 OKA2 8th 61

Complete Le Mans Cup results (key) (Races in bold indicate pole position; results in italics indicate fastest lap) Year Entrant Class Chassis 1 2 3 4 5 6 7 Rank Points 2022 AF Corse GT3 Ferrari 488 GT3 Evo 2020 LEC IMO LMS1 LMS2 MNZ SPA ALG 11th 25 2023 AF Corse GT3 Ferrari 296 GT3 CAT LMS1 LMS2 LEC ARA SPA ALG2nd77

Complete FIA World Endurance Championship results (key) (Races in bold indicate pole position; races in italics indicate fastest lap) Year Entrant Class Car Engine 1 2 3 4 5 6 7 8 Rank Points 2023 AF Corse LMGTE Am Ferrari 488 GTE Evo Ferrari F154CB 3.9 L Turbo V8 SEB PRT SPA LMS MNZ FUJ BHR 31th 0 2024 TF Sport LMGT3 Chevrolet Corvette Z06 GT3.R Chevrolet LT6.R 5.5 L V8 QAT IMO SPA LMS SÃO COA FUJ BHR 14th 37

Complete 24 Hours of Le Mans results Year Team Co-Drivers Car Class Laps 2024 TF Sport Sébastien Baud Daniel Juncadella Chevrolet Corvette Z06 GT3.R LMGT3 278 38th 11thSource:

Complete European Le Mans Series results (key) (Races in bold indicate pole position; results in italics indicate fastest lap) Year Entrant Class Chassis Engine 1 2 3 4 5 6 Rank Points 2025 TF Sport LMGT3 Chevrolet Corvette Z06 GT3.R Chevrolet LT6.R 5.5 L V8 CAT LEC IMO SPA SIL ALG 1st 78 * Season still in progress.

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