Startups in the fintech sector make up more than a third of entries in Sifted’s 2025 leaderboard of the UK and Ireland’s fastest-growing startups.
The ranking compiles the top 100 startups with the highest percentage revenue growth over the past three financial years by compound annual growth rate (CAGR) — the mean annual growth rate over a period of two years.
And while B2B SaaS company Vertice knocked SME fintech Allica Bank from the top spot, fintech is the most populous vertical on the ranking with 40 entries — up from 31 in last year’s ranking. By comparison, there are 24 B2B SaaS startups in the leaderboard, 13 healthtech startups and 12 consumer startups.
The highest-ranking fintech on the list is Monument Bank, a London-based challenger bank focusing on the “mass affluent” — individuals with $100k to $1m in assets — with a CAGR of 494.27%. Other fintechs in the top 20 include financial crime compliance startup Flagright, neolender Abound and CFO tech stack startup m3ter.
Last year’s fastest-growing startup Allica Bank is number 20 on the list with a CAGR of 290.25%.
Startups were only eligible if they were founded in or after 2010, could provide at least three years of revenue data and were private and independent. Companies were required to submit signed documentation to verify any financial data not publicly available.
Here are the top 10 fastest-growing fintechs in the UK and Ireland, according to the latest Sifted leaderboard.
1\ Monument Bank — 494.27% CAGR
Launch year: 2017
HQ: London
Employees: 113
Monument Bank is a challenger bank geared towards the “mass affluent” offering savings accounts, wealth-tracking tools and curated lifestyle experiences to members. The company reported £12.1m in revenue in annual results dated the year end of 2024 but isn’t yet profitable.
2\ Flagright — 347.21% CAGR
Launch year: 2021
HQ: London
Employees: 20
Flagright is a compliance fintech providing “AI-native” anti-money laundering solutions and risk management tools. It has raised £5.9m in total funding from Y Combinator, Moonfire and Frontline Ventures.
3\ Abound — 331.48% CAGR
Launch year: 2020
HQ: London
Employees: 85
Abound offers flexible lending solutions to consumers. It’s raised over £1.6bn in funding and is profitable as of annual results dated February 2025.
4\ M3ter — 304.54% CAGR
Launch year: 2020
HQ: London
Employees: 56
M3ter provides usage-based billing for B2B software programs used by mid-size to large companies such as customer relationship management and enterprise resource planning platforms. It’s raised over £22m in funding from investors including Union Square Ventures, Kindred Capital and Insight Partners.
5\ StrideUp — 302.39% CAGR
Launch year: 2017
HQ: London
Employees: 25
StrideUp is a digital lending fintech offering Shariah-compliant home-buying products. The Islamic finance specialist startup reported £8.4m in revenue for the financial year of 2024 and isn’t currently profitable.
6\ Zodia Custody — 300.38% CAGR
Launch year: 2020
HQ: London
Employees: 126
Crypto company Zodia Custody provides digital asset custody solutions for institutional clients such as asset manager 21Shares and ETP provider Invesco. It has seven offices across the world and has raised over £94m in funding.
7\ Bondaval — 299.85% CAGR
Launch year: 2020
HQ: London
Employees: 35
B2B fintech Bondaval provides insurance products for the credit market. It’s raised £27m in total from investors such as Octopus Ventures and Dawn Capital.
8\ Allica Bank — 290.25% CAGR
Launch year: 2019
HQ: London
Employees: 416
Allica Bank is a challenger bank catering to the small and medium enterprise (SME) market. The neobank, which was last year’s fastest-growing company in the UK and Ireland, is profitable and reported £191m in revenue in annual results ending December 2023.
9\ Carmoola — 277.46% CAGR
Launch year: 2020
HQ: London
Employees: 34
Carmoola is focused on the car financing market. It’s raised over £250m in funding from investors including QED and NatWest.
10\ 3AI — 256.22% CAGR
Launch year: 2018
HQ: London
Employees: 7
3AI is a data and analytics fintech focused on building artificial intelligence technologies for investment professionals. The company has raised £2.3m in funding and is currently profitable.
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