Top Series A companies in the United Kingdom

Companies that have closed a Series A — product-market fit confirmed and scaling. Filtered to companies headquartered in the United Kingdom.

Built from a search like: “Top Series A companies in the United Kingdom”

Ranked by current headcount across Series A companies headquartered in the United Kingdom. Refreshed daily.

1
Asda· Leeds, England, United Kingdom
- Series A
- 51.3k employees
- Founded 1949
2
Sky· Isleworth, England, United Kingdom
- Series A
- 35.3k employees
- Founded 1989
3
Google DeepMind· London, England, United Kingdom
- Series A
- 8.3k employees
- Founded 2010
4
Zenith· London, England, United Kingdom
- Series A
- 5.4k employees
- Founded 1988
5
Mind· Stratford, England, United Kingdom
- Series A
- 3.3k employees
- Founded 1946
6
Jellyfish· London, England, United Kingdom
- Series A
- 2.3k employees
- Founded 2005
7
We Are Social· London, England, United Kingdom
- Series A
- 1.9k employees
- Founded 2008
8
The Times and Sunday Times· London, England, United Kingdom
- Series A
- 1.6k employees
- Founded 2020
9
Influencer· London, England, United Kingdom
- Series A
- 1.3k employees
- Founded 2015
10
SMS· Glasgow, Scotland, United Kingdom
- Series A
- 1.2k employees
- Founded 1995
11
Zenith Vehicles· Leeds, England, United Kingdom
- Series A
- 1.1k employees
- Founded 1989
12
Prolific· Greater London, England, United Kingdom
- Series A
- 987 employees
- Founded 2014
13
Tutorful· Sheffield, England, United Kingdom
- Series A
- 979 employees
- Founded 2015
14
Koru Kids· London, England, United Kingdom
- Series A
- 734 employees
- Founded 2017
15
Eagle Eye· London, England, United Kingdom
- Series A
- 668 employees
- Founded 2003
16
The Smart Cube· London, England, United Kingdom
- Series A
- 650 employees
- Founded 2003
17
eMed Healthcare UK· London, England, United Kingdom
- Series A
- 594 employees
- Founded 2013
18
Word360· Birmingham, England, United Kingdom
- Series A
- 576 employees
- Founded 1991
19
Hydrogen Group· London, England, United Kingdom
- Series A
- 554 employees
- Founded 1997
20
PIB Insurance Brokers· London, England, United Kingdom
- Series A
- 543 employees
- Founded 2014
21
proSapient· London, England, United Kingdom
- Series A
- 510 employees
- Founded 2017
22
nShift· London, England, United Kingdom
- Series A
- 435 employees
- Founded 2021
23
Ben· London, England, United Kingdom
- Series A
- 409 employees
- Founded 2019
24
InterGen· Edinburgh, Scotland, United Kingdom
- Series A
- 385 employees
- Founded 1995
25
R3· London, England, United Kingdom
- Series A
- 379 employees
- Founded 2015

Find engineers at Series A companies in the United Kingdom

Series A companies in the United Kingdom are some of the fastest-moving employers in the market. The list above ranks the largest Series A-stage companies headquartered in the United Kingdom by current headcount, drawn from public LinkedIn and Crunchbase records. With 1,025 matching companies in our index, the density of senior engineers, designers, and founders is unusually high.

At Series A, teams tend to be small, ambitious, and on the hunt for senior talent. The companies on this list are good signals for where the the United Kingdomtalent market is heating up — and for which engineers and founders are about to become tomorrow’s operators.

Refolk converts this list into a live search. Ask for “founders of Series A companies in the United Kingdom” or “senior engineers at Series A companies in the United Kingdom hiring” and Refolk returns a ranked shortlist with evidence behind each match.

How this list is built

Refolk pulled Series A companies headquartered in the United Kingdom from public LinkedIn and Crunchbase records, ranked them by current employee count, and kept those with at least 5 employees. The list refreshes once a day.

Last refreshed: Thu, 07 May 2026 06:54:16 GMT

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Find engineers at Series A companies in the United Kingdom

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