2026 UIM F4 World Championship: Driver Guide
Profiles of every driver on the 2026 entry list. Updated throughout the season.
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Adam Wrenkler is one of the most experienced active F4 racers in the field. The son of veteran offshore racers Thomas and Annika, he won the UIM GT15 World Championship in Finland in 2017 before progressing to F4. His 2025 season ended with championship bronze – 54 points after finishing third at the decisive Viverone round, where he also set the pace in qualifying before William Leithe-Martinsen stole pole position.
For 2026 he has joined Black Pharaoh Team, the Sudanese-backed outfit that ran Norwegian driver William Martinsen to two race wins in 2025 before Martinsen and sports director Frode Sundsdal departed. Wrenkler also raced at the 24 Heures Motonautiques de Normandie in May, sharing Boat 38 with Hilmer Wiberg, Benjamin Berti and Maverick Grolet.
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#8
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William Leithe-Martinsen was the standout newcomer of the 2025 season. In his first full international campaign he won the F4 European Championship and took two race victories. A DNF in Race 3 at Viverone cost him a genuine world title challenge; he finished fourth with 45 points despite having winning pace throughout the year. He goes into 2026 as a title contender with one complete season of world championship experience behind him.
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Driver Stats
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Background
Lithuanian F4 competitor based in Kaunas. Went through the UIM youth training programme in her home city and now races in the F4 World Championship. Also serves as a coach for the Lithuanian Motorboat Academy, co-leading international Formula Future training camps – including the first UAE edition at Fujairah in February 2026 alongside Matas Kvizikevičius. She and Paulius Stainys raced together at the 24 Heures Motonautiques de Normandie in April 2026 for Akvashelf Racing alongside Latvian crew. |
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Jean Baptiste-Thomas came within two points of the 2025 UIM F4 world title – one of the closest championship finales in the series’ recent history. He went into the Viverone decider level on points with Slakteris after winning Race 3, the first Grand Prix victory of his 25-year career. When he lost power in the final race as the lake conditions worsened, Slakteris drove past and took the title. Thomas finished runner-up with 63 points. He returns in 2026 hungry for a title that came within a mechanical failure of being his.
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UAE entry in the 2026 UIM F4 World Championship. Profile to be updated. |
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Driver Stats
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Background
UAE entry in the 2026 UIM F4 World Championship. Profile to be updated. |
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#22
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Hungary’s most prominent F4 presence and one of the series’ established competitors. At the 2025 Viverone finale he claimed second place in Race 2 behind Leithe-Martinsen, his strongest world championship result to date. He returns in 2026 as one of the longer-serving drivers on the grid.
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#27
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Finnish entry in the 2026 UIM F4 World Championship. Profile to be updated. |
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Swedish entry in the 2026 UIM F4 World Championship. Profile to be updated. |
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Belgian entry in the 2026 UIM F4 World Championship. Also raced at the 24 Heures Motonautiques de Normandie in May 2026, sharing Boat 38 (Monsnauteam) alongside Maverick Grolet, Hilmer Wiberg and Adam Wrenkler. Profile to be updated. |
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Driver Stats
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Background
Lithuanian home starter at Klaipeda. Raced at the 24 Heures Motonautiques de Normandie alongside Nida Kilinskaitė, Toms Smilskalns and Niklavs Rimeicans for Akvashelf Racing. Also co-leads Formula Future training camps through the Lithuanian Motorboat Academy. Profile to be updated. |
: OLIVER MARTIN –>
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#45
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Finnish entry in the 2026 UIM F4 World Championship. Profile to be updated. |
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#47
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Finnish entry in the 2026 UIM F4 World Championship. Profile to be updated. |
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Latvian entry in the 2026 UIM F4 World Championship. Profile to be updated. |
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Latvian entry racing for RIGA Powerboat Racing, the same team that carried brother Nils Slakteris to the 2025 UIM F4 World Championship. Nils stepped up to F2 for 2026, leaving the #51 number with Ardis in F4. Profile to be updated. |
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#64
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Slovak entry in the 2026 UIM F4 World Championship. Profile to be updated. |
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Driver Stats
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Background
Finnish entry in the 2026 UIM F4 World Championship. Profile to be updated. |
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Driver Stats
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Background
Latvian entry in the 2026 UIM F4 World Championship. Also raced at the 24 Heures Motonautiques de Normandie for Akvashelf Racing alongside Toms Smilskalns, Nida Kilinskaitė and Paulius Stainys. Profile to be updated. |