Rocket List 2021

50 of the fastest-growing companies in London to accelerate your career in 2021. Vetted by investors & technology leaders. We include curated insight into why they're great places to work.

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LANDING THE ROCKET LIST

How we choose companies

We feature startups in moments of truly exponential growth. We set criteria and pick companies based on 1) impressive fundraising 2) disruptive missions 3) exploding headcounts

Our expert panel

The Rocket List was personally vetted by a group of individuals who nurture and fund technology companies

Holly Bennett

Head of Ecosystem & Portfolio Development at Accel

Sia Houchangnia

Partner at Seedcamp

Saul Klein

Co-founder and Partner at LocalGlobe

Gerard Grech

CEO of Tech Nation

Irina Haivas

Partner at Atomico

Anne Glover

Chief Executive and Co-founder of Amadeus Capital Partners

The Rocket List

Year

2021

Region

UK

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Cloud infrastructure and APIs for realtime data delivery

Data

Data

£112m

-27%

0 jobs

Accurx

Patient communication for healthcare professionals

Health and Beauty

Health and Beauty

£36m

30%

Bark

Marketplace for service professionals

Productivity

Productivity

Unknown

44%

0 jobs

Beacon

Supply Chain Visibility Platform

Travel and Transportation

Travel and Transportation

£49m

63%

0 jobs

Behavox

AI insights to safeguard & enhance businesses

Finance

Finance

£134m

-9%

Blink

Enterprise app that empowers frontline workers

Legal/HR

Legal/HR

£36m

4%

Capdesk from Carta

Equity management platform

Finance

Finance

£10m

56%

0 jobs

Cazoo

Transforming the car buying and selling experience across the UK.

Travel and Transportation

Travel and Transportation

£436m

-42%

0 jobs

Checkout.com

Payment services to power performance

Finance

Finance

£1366m

10%

0 jobs

Cleo AI

AI personal finance assistant

Finance

Finance

£103m

24%

Codat

Universal API for small business data

Finance

Finance

£127m

96%

0 jobs

Credit Kudos

Using financial behaviour to measure creditworthiness

Finance

Finance

£9m

15%

0 jobs

Cutover

Collaborative automation platform

Software

Software

£41m

-9%

Duffel

API toolkit for selling flights online

Travel and Transportation

Travel and Transportation

£42m

-31%

Eigen Technologies

AI document intelligence platform

Artificial Intelligence

Artificial Intelligence

£58m

-23%

0 jobs

Elvie

Pioneering smarter technology for women

Hardware

Hardware

£120m

-23%

0 jobs

Farewill

Wills, probate, and cremation service

Finance

Finance

£29m

-2%

0 jobs

Fidel API

Financial infrastructure platform

Finance

Finance

£64m

-40%

0 jobs

Form3

Payment technology platform

Finance

Finance

£207m

17%

Mission

To become the world's most trusted provider of payment technology.

Fintech
B2B
Payments
SaaS

12M Employee Growth
17%

Leadership

Mike Walters (Co-Founder & CEO)

Mike initially served as the company's CPO after co-founding it in 2016, moving into the role of CEO in 2023. Previously, he was a Product Director of Global Payment Acceptance at Barclaycard. Before that, he spent 10 years at Barclays in various Director roles and as Head of Corproate Payuments.

David Scola (CPO & US Chief Executive)

Prior to joining Form3 in 2022, David was the Head of North America/Chief Executive of America, UK and Ireland at SWIFT. He also spent nearly 7 years at Barclays as a Managing Director, Global head of Bank Coverage (Corp Banking) and Global Head of Financial Institutions (Barclays Corporate) and 7 years at Deutsche Bank as a Managing Director.

Benyam Hagos (CFO)

Prior to joining Form3 in 2023, Benyam was a VP, European Finance Director and COO of Europe and Middle East at Nium. He also served as the CFO at Ixaris and as a Director, UK Controller at Mastercard.

Mark Fieldhouse (CRO)

Prior to joining Form3 in 2025, Mark was a Strategic Advisor at GAINZ.AI and Future Resilience forum. He was also the VP and GM, Americas and EMEA at Rescale and GM, EMEA at NS1.

Total funding - £207.2m

Last 2 fundraises

Sep 2021

£119.5m

SERIES C

Sep 2024

£44.8m

SERIES C

This company has top investors

Last 2 fundraises


20212022202320242025£119.5m£44.8m

Our take on Form3

Freddie headshot
Freddie
Company Specialist

Form3 provides a complete end-to-end Payments-as-a-Service for financial institutions and regulated fintechs. It allows businesses to offer direct payment services via a simple interface, modernising their payment technology to make it more reliable and secure.

People expect their user experience with financial transactions to be fast and secure. Modern businesses require money to be transmitted instantly, securely, and with the promise of being available worldwide in real time. Form3 has capitalised on this modern demand, offering a comprehensive but straightforward service which gives customers greater control of their payments.

The company's partnerships have been a strong part of its growth strategy, with its technology used by major enterprise including GOldman Sachs, Nationwide and Clarency. Recently, Nationwide Building Society has made a further strategic investment in Form3, alongside a debt facility from BlackRock, supporting the company's path to profitability and continued US expansion.

Form3 has also delivered some new solutions, such as Verification of Payee for European payments provider Mollie, helping clients meet evolving regulatory requirements while strengthening fraud prevention and operational resilience. Backed by leading financial institutions and reporting record performance in 2025, Form3 is sharpening its focus on scaling its cloud-native payments platform across the US and Europe.

Form3 is hiring for 4 jobs!

Freetrade

Commission-free, self-directed investment platform

Finance

Finance

Unknown

71%

0 jobs

Goodlord

End-to-end lettings platform

Real Estate

Real Estate

£53m

11%

0 jobs

Gousto

Recipe boxes delivered to your door

Consumer

Consumer

£282m

35%

Harbr Data

Data commerce platform

Data

Data

£43m

22%

0 jobs

Hopin

Event platform provider that connects communities through virtual, hybrid, and in-person events

Media

Media

£763m

-36%

0 jobs

Impala

Platform connecting hotel software providers with hotel inventory and services

Consumer

Consumer

£25m

36%

0 jobs

Infogrid

AI for sustainable buildings

Artificial Intelligence

Artificial Intelligence

£89m

215%

0 jobs

Kheiron Medical

AI enhanced cancer detection tools for radiologists

Health and Beauty

Health and Beauty

£26m

-14%

0 jobs

LabGenius Therapeutics

Human and machine intelligence for next-gen therapeutic antibodies

Health and Beauty

Health and Beauty

£58m

4%

0 jobs

Lingumi

Smart tutoring platform for kids ages 2-7

Education

Education

£6m

-21%

0 jobs

Marshmallow

We’re building a huge technology company that helps make moving country easier.

Finance

Finance

£156m

27%

0 jobs

Moneybox

Saving and investing app

Finance

Finance

£158m

35%

0 jobs

Multiverse

Upskilling platform for AI and tech adoption

Artificial Intelligence

Artificial Intelligence

£361m

96%

Onfido

Automated identity verification

Artificial Intelligence

Artificial Intelligence

£163m

-13%

0 jobs

Paddle

Payments, tax, and subscriptions solution for SaaS

Finance

Finance

£218m

-3%

0 jobs

Primer

We are a unified payments infrastructure

Finance

Finance

£75m

-23%

0 jobs

Privitar

Solving data privacy challenges for enterprises

Security

Security

£111m

-9%

0 jobs

Prolific

Research participant sourcing & management

Artificial Intelligence

Artificial Intelligence

£25m

28%

0 jobs

Qatalog

Enterprise Intelligence platform

Artificial Intelligence

Artificial Intelligence

£19m

31%

0 jobs

Revolut

Comprehensive financial services platform

Finance

Finance

£2776m

78%

0 jobs

SeedLegals

One-stop platform for legals for startups

Legal/HR

Legal/HR

£4m

-11%

0 jobs

Sensat

Visualisation for infrastructure projects

Artificial Intelligence

Artificial Intelligence

£43m

6%

Snyk

Developer security platform

Artificial Intelligence

Artificial Intelligence

£1187m

-21%

0 jobs

Streetbees

Consumer intelligence platform

Data

Data

£46m

-11%

0 jobs

Thought Machine

Cloud native banking platform

Finance

Finance

£463m

22%

Tiney

Digital marketplace for childcare

Education

Education

£16m

9%

0 jobs

Trint

Transcription software

Artificial Intelligence

Artificial Intelligence

£9m

-5%

0 jobs

TrueLayer

A payments network built for growth

Finance

Finance

£241m

100%

0 jobs

Unmind

Workplace mental health platform

Health and Beauty

Health and Beauty

£74m

39%

0 jobs

Wagestream

Bringing employees financial freedom

Finance

Finance

£164m

50%

0 jobs

Yapily

Secure API for banks

Finance

Finance

£52m

102%

0 jobs

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