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YC companies in London

215 Y Combinator companies based in London, with team size, growth, open roles and funding.

Updated weekly, last on November 9, 2026. Roster from Y Combinator's public directory.

Hiring the mostlast 60 days
33 roles
Focal SystemsW16
  1. 2ARQ24
  2. 3Prolific19
See all 32
Fastest growingteam, 6 months
+220%
BalanceW26
  1. 2Hirebolt+100%
  2. 3Dayjob+91%
See all 55
Shrinkingteam, 12 months
−51%
MinimumS20
  1. 2Kular−43%
  2. 3Stacker−24%
See all 21
Raised the mostlast 12 months
$75M
Model MLW24
  1. 2Encord$60M
  2. 3LemFi$53M
See all 24
Companies
215
Active
169
Hiring, last 60 days
32
Open roles, 60 days
175
People on these teams
9,742
Showing 50 of 215 companies
CompanyBatchTeam6 mo12 moOpen rolesTotal raisedLast round
Making diverse, high-quality data easily available to anyone, anywhere
S191,580+14%+72%19$33.5MSeries A$32.3M, Jul 2023
We’re building the world’s bank payment network.
S11Acquired862+1%+2%0$529MSeries G$312M, Feb 2022
AI-powered Language Operations platform
W14Acquired655−1%−5%0$112MUndisclosed round$21M, Dec 2023
Fair, simple and accessible financial services
S21480+4%+15%2$86.8MCorporate round$53M, May 2026
The global financial platform for affluent consumers in the Americas.
S21277+49%+147%24
The AI for Financial Services.
W24263+49%+217%5$87.5MUndisclosed round$75M, Aug 2026
Cross-Border Payments and FX Simplified
W19258−3%+5%15$12.3MGrant$100K, Oct 2024
The data layer for physical AI
W21231+31%+75%3$110MSeries C$60M, Feb 2026
Single account to manage money across the world
W22224+1%+31%1$94.3MSeries B$53M, May 2025
Headstart uses Machine Learning to help companies decide on who to…
S17Acquired220−2%−2%0$16.6MSeed$5M, Sep 2019
A B2B marketplace for wholesale second hand fashion
W22203+8%+7%2$46MSeries B$25M, Jul 2026
Where Single Muslims meet
S17187+2%+10%2$10.9MSeries A$7M, Jan 2024
Vertical AI agents running B2B outbound on autopilot, with human SDRs
X25140+77%+724%0$6.2MSeed$6.2M, Sep 2025
Building the Operating System for B&M Retail using Deep Learning
W16131+3%+2%33$41.9MSeries B$25.9M, Nov 2021
All-in-one workspace for companies making regulated products
S20124+19%+57%YC
An online guide that tells talented graduates how to maximise the…
S15121+32%+78%0$120KYC investment$120K, Aug 2015
Rebuilding data in advertising to protect privacy
S14108−3% 1$105MSeries C$75M, Nov 2021
Growth through always‑on consumer understanding
S24103+54%+472%9$55.8MSeries A$50M, Sep 2026
Helping businesses in emerging markets make pay their international…
S23102+13%+67%YC$18MSeries A$18M, Feb 2025
AI-Native CPQ & Billing for Modern Pricing Models
S2383+9%+20%YC$4.5MSeed$4M, Sep 2025
Inventory management SaaS for Retail & Consumer brands
S2277−5%−13%0$21.2MSeries A$16.9M, Oct 2024
Compliance and back office workflows for Wealth Managers.
S2476+15%+49%1$17.7MSeries A$17.2M, Oct 2025
The online company that gets everyone offline
W1876−3%−16%0$81.4MSeries B$60M, Jun 2022
API for at-home health data
W2074+37%+72%5$18.6MSeries A$18M, Mar 2025
AI patent drafting, prosecution, litigation and more for legal teams.
S2372+33%+125%3$55MSeries B$40M, Dec 2025
The complete toolkit to sell travel.
S18660%+16%5$56.2MSeries B$30M, Oct 2019
On-Demand Electronics Manufacturing
W1266+14%+32%8$46.4MSeries A$28M, May 2026
Shopify for experiences
S1865+7%−2%1$59.6MSeries A$10M, Oct 2026
Trusted $€£ accounts abroad for people from unstable economies.
S2263+31%+57%YC$22MNon-equity support$18M, Sep 2026
Revolutionising the way travellers discover, plan and book a trip
W1563−3%−5%YC$120KYC investment$120K, Mar 2015
AI-Powered HRIS for high performing teams
W2161+13%+17%2$20MSeries A$15M, Oct 2022
Deliver on the Promise of Design
S1561 −21%0$1.4MSeed$1.2M, Jul 2016
RNA medicines for liver diseases
W2059−2%−8%0$39.8MSeries A$30M, Oct 2022
AI-Powered Infrastructure for Insurance & Healthcare
W2258−15%−15%YC$4.1MSeed$3M, Aug 2025
Essentials delivered in 30 minutes.
S20Acquired560%+2%0$5.1MYC investment$125K, Aug 2020
The design system layer for coding agents
S1956−5%−2%0$11.2MSeries A$10M, Aug 2021
Bits is a credit card designed to help people build credit
S2050+6% 1$258KYC investment$125K, Aug 2020
Robotic human cell manufacturing
S1849+7% 4$20.8MSeries A$19M, Nov 2023
Speed up non-coding tasks for engineering teams
W2048+4%+9%0$47.6MSeries B$30.1M, Sep 2024
Helping creators monetize
W1947+7%−8%0SeedJan 2022
Navigating patients to the right place, first time.
S2346+10%+28%5$3.9MSeed$3.4M, Jul 2024
Carbon markets platform and solutions
S2144−6%+2%0$16.6MSeries A$13.5M, Apr 2023
Create video by chatting to AI
S2242−9%−19%0
Fully Agentic SWE
W2340+8%+33%8$3.5MUndisclosed round$534K, Jan 2026
AI Customer Service Agents for trades and field services
S2339+50%+117%1$16.4MSeries A$12.9M, Jan 2026
AI based Customizable Subscription & Revenue Management Platform
W2239−11%−19%0$500KYC investment$500K, Mar 2022
The global mobile network for business.
S2237+16%+23%0$4.4MSeed$4.2M, Feb 2023
AI Document Understanding API
W21370%−3%0$23.3MUndisclosed round$7M, Mar 2023
Banking for businesses
W2137−7%−18%YC$3.9MSeed$3.8M, Jan 2022
Models that keep learning
W2336−10%−16%0$8MSeed$8M, May 2024

How this works

1. The roster

Every launched company in YC's public directory, with its batch, status, industry and location. New companies show up the week YC lists them.

2. The numbers

Each company is matched to Crustdata by its website. Crustdata adds team size and its change over 6 and 12 months, open roles from job postings, reported funding, and founders' past employers.

3. The lists

Hiring the most counts distinct roles posted in the last 60 days. Growth needs 10+ people today, shrinking 20+ a year ago, so tiny teams do not top the lists. Rebuilt every week.

Built with Crustdata. Get your own API key and build your own.

The numbers on this page come from three Crustdata API calls. Crustdata tags 5,000+ companies with Y Combinator as an investor; swap the filter for any investor, industry or headcount range and track your own list, with founders' work emails one call away.

  • Company search for team size, growth and funding
  • Job search with a count by company, for who is hiring and for what
  • A watch that re-runs the search weekly and sends only what changed
# 1. every company with Y Combinator as an investor
curl https://api.crustdata.com/company/search \
  -H "authorization: Bearer $CRUSTDATA_API_KEY" \
  -H "x-api-version: 2025-11-01" \
  -d '{
    "filters": { "field": "funding.investors",
                 "type": "in", "value": ["Y Combinator"] },
    "fields": ["basic_info.name",
      "headcount.total", "headcount.growth_percent",
      "funding.total_investment_usd"],
    "limit": 100
  }'

# 2. open listings per company, last 60 days (limit 0 = counts only)
curl https://api.crustdata.com/job/search \
  -H "authorization: Bearer $CRUSTDATA_API_KEY" \
  -H "x-api-version: 2025-11-01" \
  -d '{
  "filters": { "op": "and", "conditions": [
    { "field": "company.basic_info.company_id",
      "type": "in", "value": [...] },
    { "field": "metadata.date_added",
      "type": "=>", "value": "2026-08-24" } ]},
  "limit": 0,
  "aggregations": [{ "type": "group_by",
    "field": "company.basic_info.company_id", "agg": "count" }]
}'

# 3. the same company filter as a weekly watch: POST /watch/company/search

Questions about London YC companies

How many London YC companies are there?

215 Y Combinator companies are based in London; 169 are active.

Which London YC companies are hiring?

32 companies posted roles in the last 60 days, led by Focal Systems (33 roles), ARQ (24 roles) and Prolific (19 roles). 54 mark themselves as hiring on YC's directory.

Which London YC companies are growing fastest?

By team growth over 6 months (10+ people): Balance (+220%), Hirebolt (+100%) and Dayjob (+91%).

Which London YC companies raised the most?

Largest latest rounds in the last 12 months, after their YC batch: Model ML ($75M), Encord ($60M) and LemFi ($53M).

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