Series A AI companies in London
Companies building AI products, foundation models, and applied ML platforms. Filtered to Series A-stage companies headquartered in London.
- StageSeries A
- IndustryAI
- HQLondon
- Matches32
Built from a search like: “Top Series A AI companies in London”
Ranked by current headcount across Series A AI companies in London. Refreshed daily.
- 1Google DeepMind· London, England, United Kingdom
- Series A
- 8.3k employees
- Founded 2010
- 2Isomorphic Labs· London, England, United Kingdom
- Series A
- 348 employees
- Founded 2021
- 3Stylus· London, England, United Kingdom
- Series A
- 256 employees
- Founded 2010
- 4EyeBio· London, England, United Kingdom
- Series A
- 95 employees
- Founded 2021
- 5National Cancer Research Institute (NCRI)· London, England, United Kingdom
- Series A
- 78 employees
- Founded 2001
- 6IMU Biosciences· London, England, United Kingdom
- Series A
- 76 employees
- Founded 2019
- 7Verdiva Bio· London, England, United Kingdom
- Series A
- 73 employees
- Founded 2024
- 8Alchemab Therapeutics Ltd· London, England, United Kingdom
- Series A
- 62 employees
- Founded 2019
- 9Purespring Therapeutics· London, England, United Kingdom
- Series A
- 59 employees
- Founded 2020
- 10Engitix Therapeutics· London, England, United Kingdom
- Series A
- 58 employees
- Founded 2016
- 11Amber Therapeutics· London, England, United Kingdom
- Series A
- 56 employees
- Founded 2021
- 12Portal Biotech· London, England, United Kingdom
- Series A
- 56 employees
- Founded 2021
- 13Bulbshare· London, England, United Kingdom
- Series A
- 52 employees
- Founded 1991
- 14Mytos· London, England, United Kingdom
- Series A
- 48 employees
- Founded 2016
- 15Peptone· London, England, United Kingdom
- Series A
- 45 employees
- Founded 2018
- 16Shellworks· Greater London, England, United Kingdom
- Series A
- 43 employees
- Founded 2019
- 17Myricx Bio· London, England, United Kingdom
- Series A
- 32 employees
- Founded 2019
- 18Baseimmune· London, England, United Kingdom
- Series A
- 29 employees
- Founded 2019
- 19Multus· London, England, United Kingdom
- Series A
- 27 employees
- Founded 2020
- 20Eleusis· London, England, United Kingdom
- Series A
- 26 employees
- Founded 2013
- 21Huq Industries· London, England, United Kingdom
- Series A
- 25 employees
- Founded 2014
- 22Hyris· London, England, United Kingdom
- Series A
- 24 employees
- Founded 2014
- 23Centauri Therapeutics Limited· London, England, United Kingdom
- Series A
- 23 employees
- Founded 2015
- 24Leucid Bio· London, England, United Kingdom
- Series A
- 23 employees
- Founded 2014
- 25Kesmalea Therapeutics· London, England, United Kingdom
- Series A
- 21 employees
- Founded 2020
Find engineers at Series A AI companies in London
Searching for “engineers at top Series A AI companies in London” surfaces this slice of the market. The list above ranks AI companies headquartered in London whose latest disclosed round is Series A, by current headcount, drawn from public LinkedIn and Crunchbase records. With 32 matching companies in our index, this is a tight read on where the AI talent in London is heating up.
Three filters at once narrows the field hard. The companies that survive all three — Series A, AI, in London — are usually the most targeted recruiting pool a hiring manager can ask for. Senior engineers, founding designers, and product leads here are about to become AI’s next operators and angel investors.
Refolk converts this list into a live search. Ask for “senior engineers at Series A AI companies in London hiring” or “founders of Series A AI companies in London who left in the last year” and Refolk returns a ranked shortlist with the evidence behind each match.
How this list is built
Last refreshed: Thu, 07 May 2026 06:36:54 GMT
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