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Sifted 100: UK & Ireland (2025)
Welcome to the second annual Sifted 100: UK & Ireland Leaderboard, which ranks the region’s 100 fastest-growing startups by revenue growth.
Together, these 100 companies have raised £10.5bn in funding, generated £5.38bn in revenue over the past three financial years and now employ around 19,000 people across the UK and Ireland. Notably, £3.3bn of that revenue was generated in the most recent year alone, underscoring just how quickly these startups are scaling.
To be eligible, startups had to be private, independent and headquartered in the UK or Ireland, with the majority of revenue generated from proprietary technology. Companies must have been founded in or after 2010, and have at least three years of revenue data (from 2021–2023, 2022–2024 or 2023–2025), covering accounting periods of at least 26 weeks. Revenue had to be at least £42k in the base year and £420k in the most recent year.
Companies were required to submit signed documentation to verify any financial data not publicly available. Some opted to keep parts of this information confidential.
Read the accompanying research report, featuring interviews with several founders, here. Our ranking of the 125 investors with at least two companies on the leaderboard can be viewed here.
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