Y Combinator portfolio in London

The most prolific seed accelerator in the world, batch class twice a year. Filtered to companies headquartered in London.

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Built from a search like: “Y Combinator-backed companies in London”

Ranked by current headcount across Y Combinator-backed companies in London. Refreshed daily.

1
Monzo· London, England, United Kingdom
Time is money. Make the most out of both with Monzo. Britain's favourite bank.
- Secondary
- 5.8k employees
- Founded 2015
2
Prolific· Greater London, England, United Kingdom
Prolific is a technology company building the biggest pool of quality human data in the world—and the ultimate platform to access it.Over 35,000 AI developers, researchers, and organizations use Prolific to gather data from real, engaged participants—with a new study launched every 2 minutes.Prolific has been ranked among the fastest-growing businesses in the Financial Times 1000 in 2025 & 2024 and the Deloitte Technology Fast 50 in 2023.
- Series A
- 1.4k employees
- Founded 2014
3
Bright Network· London, England, United Kingdom
Welcome to Bright Network. We help the world’s best companies find the talent they need to grow their businesses faster and give the brightest graduates access to the best possible career opportunities.Our mission is to provide better matchmaking between employers and graduates. By combining rich data, technology and analytics with our knowledge and insights, we create highly targeted and personalised experiences, interactions and opportunities to connect students and their future employers. Our goal is to be inclusive and consultative. We strive to help our clients find the amazing talent they need - and to make sure our members discover, and fulfil, their potential. We're lucky to work with a host of remarkable companies, from the blue chip and established to SMEs and start-ups. Our clients include Nestlé, KPMG, Goldman Sachs, PwC, P&G, Bain & Company, Teach First, Deloitte, Clifford Chance, M&S, Berenberg and Slaughter and May.Through our diverse network of 1,000,000+ members we can help you compete for the talent you need to grow your business. To find out more about our unique network and how we can help you meet bright talent, visit https://employers.brightnetwork.co.uk/
- Seed
- 1k employees
- Founded 2013
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4
GoCardless· Greater London, England, United Kingdom
Welcome to the new era of payments. Collect one-off, automated, or recurring payments – directly from your customer's bank account to yours. Putting an end to late payments, chasing customers, stress, and expensive fees. It's just cash, flowing from one account to another. Join 100,000 businesses of all sizes, worldwide, who trust us to power their payments.
- Series G
- 847 employees
- Founded 2011
5
LemFi· London, England, United Kingdom
We’re building the go-to financial app for the Global South - enabling our customers to spend, save, send, and grow their wealth, all in one place. Moving countries shouldn’t mean losing access to fair and affordable financial services, yet millions still face barriers to sending money, saving securely, or accessing credit when it matters most. That’s why our app brings together international transfers, multi-currency accounts, savings, and financial tools designed for life wherever you call home.With over 2 million customers globally, we empower people to support their families, build financial stability, and stay connected from anywhere in the world.For support enquiries, please contact support@lemfi.com
- Corporate
- 458 employees
- Founded 2020

6
Verto· London, England, United Kingdom
Verto is a global B2B payments solution that helps businesses send money to anyone, anywhere. Using a purposefully built tech infrastructure and payment rails, you can instantly send and receive money in over 200 countries. Today, Verto helps 1000+ customers from startups, SMEs to large corporate companies convert millions of dollars per year.Using our liquidity and price discovery marketplace solution, new customers can convert between 49 currencies, open bank account or wallets in seconds and make payments on a single platform.
- Grant
- 264 employees
- Founded 2017
7
Headstart (Defunct)· London, England, United Kingdom
Potential is hard to pin down. It's even harder when you’re dealing with 100’s of roles and 1000’s of applications.By supercharging candidate screening, we make it easier for recruiters to identify potential and hire the best candidates, regardless of their background.That last part is important. We’re passionate about making hiring fairer for all. Our platform assesses every candidate equally and removes unconscious bias from the recruitment process.Together we can make hiring faster for companies, fairer for candidates, and better for society as a whole.
- Seed
- 223 employees
- Founded 2015
8
Aspora· London, England, United Kingdom
At Aspora, we're building financial bridges that connect the global diaspora - starting with India, the Philippines and beyond - to home.Trusted by 1 Million+ users worldwide for seamless money transfers home at Google rates.No hidden fees, no surprises - just transparent financial services designed for global citizens living away from home.
- Series B
- 219 employees
- Founded 2022
9
Anima· London, England, United Kingdom
The next generation care enablement platform - with everything care teams need to resolve caseload quickly and safely.
- Series A
- 210 employees
- Founded 2021
10
Fleek· London, England, United Kingdom
A marketplace for wholesale second-hand fashion - connecting retailers with vintage wholesalers around the world.
- Series B
- 186 employees
- Founded 2021

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Y Combinator portfolio companies in London

Y Combinator’s London portfolio is one of the most active recruiting pools in the market. The list above ranks Y Combinator-backed companies headquartered in London by current headcount, drawn from public LinkedIn and Crunchbase records. With 98 matching companies in Refolk’s index, you can see exactly where the Y Combinator thesis has landed locally.

Y Combinator companies in London tend to attract a specific type of operator - a founder or early hire bought into both the firm’s thesis and the city’s ecosystem. That makes the engineers and designers at these companies particularly valuable signals.

Refolk lets you reach this pool. Ask for “Y Combinator companies in London hiring founding engineers” or “founders of Y Combinator-backed companies in London who left in the last year” and Refolk returns a ranked shortlist with evidence behind each match.

How this list is built

Refolk pulled companies whose disclosed Crunchbase investor list includes Y Combinator and whose HQ is in London, ranked them by current employee count, and kept those with at least 5 employees. The list refreshes once a day.

Last refreshed: Wed, 05 Aug 2026 14:03:24 GMT

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How is this ranking built?

The list draws on the public company graph - headcount and growth signals, funding history, and recency. The criteria chips at the top show exactly which filters produced it, and the methodology section explains the ranking.

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The underlying index updates continuously and this page re-renders at least daily. Last refreshed: Wed, 05 Aug 2026 14:03:24 GMT.

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