Top IPO companies in London
Public companies and recent post-IPO follow-on raises. Filtered to companies headquartered in London.
Hiring from these companies? Find the people who work there.
Change the role to whoever you are hiring, or narrow the list below. 500 free credits on sign-up, no card needed.
Ranked by current headcount across IPO companies headquartered in London. Refreshed monthly.
- 1HSBC· South Quay, Canary Wharf, All Saints, Mudchute, West India Quay, Heron Quays, Westferry, Millwall, Limehouse, East India Dock Road, Coldharbour, London Arena, Island Gardens, Poplar, East India, Blackwall, Cubitt Town, England, United Kingdom
Our purpose is to open up a world of opportunity for our customers, investors and employees.We're one of the world’s largest banking and financial services organisations, serving about 41 million customers worldwide, from individual savers and investors to some of the world’s biggest companies and governments.Our network covers 56 countries and territories, and we’re here to use our unique expertise, capabilities, breadth and perspectives to help our customers capture opportunities.HSBC is listed on the London, Hong Kong, New York, and Bermuda stock exchanges.To view our social media terms and conditions please visit the following webpage: https://www.hsbc.com/terms-and-conditions
- Post-IPO debt
- 198.6k employees
- 2G4S· London, England, United Kingdom
G4S is a leading security and facility services company that provides proactive security services and cutting-edge smart technology to deliver tailored, integrated security solutions that allow clients to focus on their core business. Through a global workforce of approximately 800,000 people, we leverage best practices in communities all over the world. With revenues at approximately $20 billion, we are supported by efficient processes and systems that can only come with scale to help deliver our promise locally: keeping people safe so our communities can thrive. For more information on G4S, visit www.g4s.com.
- Post-IPO equity
- 118.2k employees
- Founded 1901
- 3Aon· London, England, United Kingdom
We exist to shape decisions for the better — to protect and enrich the lives of people around the world. Through actionable analytic insight, globally integrated Risk Capital and Human Capital expertise, and locally relevant solutions, our colleagues provide clients in over 120 countries with the clarity and confidence to make better risk and people decisions that help protect and grow their businesses.
- Post-IPO debt
- 94.7k employees
- Founded 1979
- Live search
This list is a starting point
I can run a natural-language search across LinkedIn, GitHub, and the open web. Fire one of these, or edit the box up top to match exactly who you're after.
500 free credits on sign-up, no card needed.
- 4GSK· London, England, United Kingdom
We are uniting science, technology and talent to get ahead of disease together.Our community guidelines: https://gsk.to/socialmedia
- Post-IPO debt
- 91.5k employees
- Founded 1929
- 5bp· London, England, United Kingdom
Check out our commenting guidelines 👉 bp.com/CommentsGuide
- Post-IPO equity
- 81.2k employees
- Founded 1909
Find engineers at IPO companies in London
IPO companies in London are some of the fastest-moving employers in the market. The list above ranks the largest IPO-stage companies headquartered in London by current headcount, drawn from public LinkedIn and Crunchbase records. With 257 matching companies in Refolk’s index, the density of senior engineers, designers, and founders is unusually high.
At IPO, teams tend to be small, ambitious, and on the hunt for senior talent. The companies on this list are good signals for where the London talent 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 IPO companies in London” or “senior engineers at IPO companies in London hiring” and Refolk returns a ranked shortlist with evidence behind each match.
How this list is built
Last refreshed: Mon, 26 Oct 2026 15:27:57 GMT
Need an even more specific search?
Refolk runs natural-language searches across LinkedIn, GitHub, and the open web. Try one of these:
500 free credits on sign-up, no card needed.
Related lists
- Series A in London
- Series B in London
- Seed in London
- IPO in the United States
- Seed in San Francisco
- Series A in San Francisco
- Series B in San Francisco
- Series C in San Francisco
See all company lists.
Or zoom out
Common questions
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.
How fresh is the data?
The underlying index updates continuously and this ranking is rebuilt monthly. Last refreshed: Mon, 26 Oct 2026 15:27:57 GMT. For a list built against the index as it stands today, sign up and run the search live.
Can I get the full list of 257 companies?
Yes. This page shows the top of the ranking; sign up and I'll run the search live for the complete, current list. You start with 500 free credits, no card required.
Can I find the people inside these companies?
Yes. Ask in plain English - for example "engineering leaders at these companies who joined in the last year" - and I return the specific people, with context on each.
Try it on the search you came here for
Stop building boolean strings. Just describe the person.
Type one sentence. I plan the search, read GitHub, public LinkedIn and Crunchbase records, and the open web as it is right now, and hand back a ranked list with the reason next to every name.
01Describe them
One plain sentence. Role, city, stack, stage, whatever matters to you.
02I read the web live
GitHub, public LinkedIn and Crunchbase records, the open web. Not a database that went stale last quarter.
03You read the shortlist
Ranked, with the reasoning under every name. Open a profile, ask a follow-up, narrow it down.
- Staff backend engineers in NYC who shipped Rust in production
- Series A fintechs in SF under 50 people, growing headcount this year
- Maintainers of fast-growing Rust web frameworks on GitHub
- No boolean, no filters, no seat to buy. One box.
- Read at search time, so a profile updated yesterday counts today.
- Every step visible as it runs, every name with its reason.
500 free credits on sign-up. No card, no demo call. See real searches.