How to Find Startups in the UK (Practical Guide)

The UK is one of the easiest startup markets in the world to prospect into, and most people selling into it never realise why. It is not that British founders are approachable — they are among the most heavily prospected people on earth. It is that the UK company register is free, public and detailed enough to answer the question every other market makes you guess at: how new is this company, who runs it, and is it a real trading business or a shell?

Three things work together: the register as a discovery filter, accelerator portfolios as curated lists, and funding announcements as a timing signal. Then qualification, and how to write to a UK founder without being deleted in two seconds.

Companies House: the register nobody outside the UK uses properly

Companies House is the UK government's registrar of companies. Every limited company registered in the UK has a public record there, and searching it is free. If you sell into UK startups and have never opened it, you have been prospecting with one eye closed.

What a company record generally carries:

• Company name and company number — the number is permanent; names change, numbers do not. Use it as your database key.
• Incorporation date — when the company legally came into existence. The most valuable field on the page for anyone hunting startups.
• Registered office address — the official address for legal correspondence, not necessarily where anyone works.
• SIC codes — Standard Industrial Classification, a numeric industry classification the company selects for itself. Roughly the UK equivalent of NAICS.
• Directors and officers — named individuals with role, appointment date, nationality, and month and year of birth (the full date is not shown publicly). Named humans, not info@.
• Filing history — a dated list of everything filed: accounts, confirmation statements, officer and address changes, charges.
• Confirmation statement — an annual filing confirming the company's details are current. The "we still exist, here is our current information" filing.
• Accounts — small companies file abbreviated versions, so you rarely get revenue. But what they file, and whether they file on time, tells you plenty.
• People with significant control — those holding meaningful ownership or control. Often how you spot who really owns the thing.

Companies House also publishes machine-readable data and a developer interface. Check the official documentation for current limits and fees rather than trusting any blog post on the subject; what matters strategically is that the data is open and structured.

Incorporation date is your "is this a startup" filter

In most markets "find me startups" is a fuzzy request; you guess from website design or whether the team page looks young. In the UK you just ask the register: companies incorporated in the last three years. That one filter does most of the work. Layer SIC codes on top — software publishing, computer programming, information service activities and other professional, scientific and technical activities are where most tech startups classify themselves — and you have a targeted universe rather than a scrape.

1. Incorporation window. Zero to eighteen months for pre-seed hunting, one to four years for companies with traction, four to eight for scale-ups. Genuinely different buyers; more below.
2. SIC code group. Two or three matching your buyer. Not twenty — you will drown in consultancies.
3. Status: active. Drop dissolved companies and companies in liquidation immediately.
4. Filing pattern. Recent confirmation statement? Dormant accounts?

Reading the signals: what filings actually tell you

This is where the register stops being a list and becomes intelligence.

A dormant company. Filing dormant accounts declares no significant accounting transactions in the period. Not trading — somebody registered a name and parked it, to protect a brand or because a plan never happened. Noise in a prospect list.

Micro-entity accounts. The smallest reporting category. The company is genuinely tiny — fine if you sell to pre-seed founders, fatal if your product needs a department to buy it. Either way it is information: there is no procurement process here.

A registered office at an accountant or formation agent. Enormous numbers of UK companies use their accountant's address or a formation service as their registered office, and that address says nothing about where the team sits. Filter geography on registered addresses alone and you will "find" thousands of startups in a handful of buildings that are just mailrooms. Cross-check against the website, job ads or the founder's professional profile.

A director with fifty other directorships. Directors' records are searchable across companies. Dozens of active appointments usually means a professional director or an accountant acting for clients — not a founder you can sell to. Conversely, two directors appointed on the incorporation date with no other appointments is almost certainly a genuine founding team.

Late filings and overdue confirmation statements. A company drifting past deadlines is often a company nobody is minding. Sometimes it is just chaos at a busy startup — but combine late filings with a website unchanged for two years and you have found a corpse.

Charges, name changes, address changes. Registered charges against company assets indicate secured lending — somebody underwrote them. A recent name change often marks a pivot or rebrand; a move from a home address to a real office suggests growth. All three are specific conversation openers.

One honest caveat: the register records what companies file, not what is true. Directors' details go stale, addresses are frequently service addresses, and SIC codes are self-selected and often lazily chosen. Treat it as a strong first filter, not a verified business database.

Accelerator and incubator portfolios: lists someone else pre-qualified

The register gives you volume. Accelerator portfolios give you quality, because somebody with money already filtered them. A portfolio page lists companies that passed a competitive selection, took capital, have a minimum viable team and are actively building — a better qualification bar than most paid databases apply.

• Techstars — runs UK programmes and publishes portfolio companies with cohort and year.
• Seedcamp — long-running London seed investor with a large published portfolio, weighted to European software.
• Entrepreneur First — backs individuals before they have a company and helps them form teams. A stream of very young, very technical companies: ideal for pre-seed selling, useless if you need budget.
• University spinout programmes — the technology transfer arms of major research universities, spinning out deep tech and life sciences. Cambridge and Oxford are obvious, but almost every research-intensive UK university has one.
• Regional accelerators and innovation hubs — every major UK city has publicly funded or corporate-backed programmes in fintech, health tech, net zero, advanced manufacturing. Less picked over than the London names, which makes them more valuable.

Work a portfolio properly: pull the company list, then take each name back to Companies House for incorporation date, directors and filing status. The portfolio says the company was selected; the register says whether it is still alive and who to write to. That merge — a curated list enriched with registry data — is what good prospecting looks like, and it is exactly what a tool like JustLeadIt automates when you would rather not do it by hand.

Funding announcements: the highest-intent window in B2B

If you take one thing from this guide, take this: a company that has just announced a round is, briefly, the most buyable company in your market.

• There is money — and more importantly it is new money with no existing claims on it.
• There is a mandate to spend it. Nobody raises to sit on cash. They raised against a plan with hiring, product and go-to-market commitments, and the board expects movement.
• The plan is not yet a contract. Two months later the agency is chosen, the recruiter retained, the platform bought. In week three the decisions are still open.
• Attention is high. Founders are actively looking for suppliers because problems are arriving faster than they can hire for them.

Announcements surface in UK and European tech press, on the company's own site and social accounts, through the lead investor, and often from the founder personally before any of those. There is also a registry echo — an allotment of shares filing typically follows an equity round, so the register can confirm a raise happened even when nobody wrote about it.

Build a running list rather than reacting ad hoc. Weekly rhythm: collect the UK rounds announced that week, filter to your segment, enrich with register data, write within two weeks. Speed is the whole strategy — an announcement is worth ten times more in week one than in month three. And do not only chase big rounds: a small pre-seed is a founder personally choosing every supplier and answering their own email, while a large Series B is a procurement process.

Geography: the UK is not one market

London dominates by volume but is several markets. The City and Canary Wharf anchor fintech and insurtech; Shoreditch and east London hold consumer and general software; King's Cross has a heavy AI and data concentration; health tech clusters to the west and around major hospital trusts. "London" is nearly useless as a filter. "Seed-stage fintech in London" is a segment.

Cambridge is deep tech — semiconductors, AI research, life sciences, scientific instruments — often founded by researchers, slower to revenue, buying technical services rather than growth marketing. Oxford is spinout territory: therapeutics, quantum, materials, with patient capital and long cycles. Manchester has a real scene in media, e-commerce and enterprise software at lower cost than London. Edinburgh and the wider Scottish scene are strong in fintech, data science and space technology. Bristol concentrates in semiconductors, robotics and climate tech. Also worth a list: Leeds, Birmingham, Cardiff, Belfast, Newcastle and Brighton — all less saturated with outreach than London, and they reply more.

Segment by stage, because stages are different buyers

Pre-seed and seed. Two to fifteen people. The founder is the buyer, the user and the person paying the invoice. No procurement, no legal review, no security questionnaire, decisions in days. They buy from people they trust and things they can start using immediately. Price-sensitive in absolute terms but not obsessed — their real constraint is time.

Series A. Fifteen to sixty people, hiring its first functional leaders, budget ownership drifting away from the founder. The messiest stage to sell into: you must guess whether the founder or the new function head owns the decision, and they are often renegotiating that between themselves.

Series B and beyond. Sixty to several hundred, and there is a process now — security review, legal review, sometimes formal vendor onboarding. The founder is not your buyer and will not reply. Your buyer is a function head with a budget line and an internal case to make, so give them the material to sell you internally.

Pick one and build for it. A message that works on a pre-seed founder — short, direct, personal — reads as unprofessional to a Series B procurement contact. A message full of case studies and compliance is deleted instantly by a pre-seed founder.

Qualification: cutting the ones that waste your month

The quietly dead. Raised in a good year, never found the market, silent since. Website still up, everything frozen. Tells: last funding news two-plus years old, no recent filings or overdue ones, no job postings, founders' profiles showing a new employer. A company that stopped filing is a company that stopped.

The agency in a startup costume. A large share of "startups" are consultancies, dev shops or marketing agencies with product-shaped websites. They are not buying what you sell to startups — they are selling something similar to the same people. Tells: services-and-rates language, a client-logo section, hiring only billable roles, no product signup anywhere.

The empty UK entity. A UK limited company whose entire team is elsewhere — legal and very common, since the entity may exist for banking, credibility, contracting or investor structure. Tells: registered office at a formation agent, overseas-resident directors, no UK job postings, no UK phone number. Dead if you need a UK buyer; fine if you just want a company that buys in pounds.

The holding company. Groups register multiple entities, so you may be looking at a dormant subsidiary while the trading company sits elsewhere in the structure. The ownership and control information usually untangles it.

A workable rule: before sending anything, spend ninety seconds confirming the company is trading, the person is still there, and the thing you are about to reference is current. If you cannot confirm all three, do not send.

How to actually reach UK founders

UK founders — especially anyone who has announced a round — receive an absurd volume of outreach: dozens of messages a day, most machine-generated, most opening with false familiarity. Their default is delete. You are not competing against other good emails; you are competing against a reflex.

• Short. Under a hundred words. If it needs scrolling it is gone; length itself reads as "this was not written for me".
• One specific, verifiable observation. Not "I saw you raised" — everyone says that. Rather: you announced a Series A in March and you are hiring three backend engineers in Manchester. Checkable, and visibly thirty seconds of real work.
• One thing you do, in plain words. No leveraging, no unlocking. Say what you make and who it is for.
• One easy question. "Worth a quick call?" — not "please book thirty minutes via my calendar link".
• No corporate voice. Britain has low tolerance for hard-sell register. Overclaiming, artificial urgency and superlatives read as unserious; understatement lands better than enthusiasm.
• Two follow-ups, then stop. A week or more apart, something new each time, then genuinely leave them alone.

If you are selling from outside the UK — a development studio, a design team, a recruiter, a SaaS product — three additions. Lead with the specific capability and the evidence, not with your location. If your working day genuinely overlaps the UK one, say so plainly and early, because an asynchronous supplier is a real fear for a small team. And never open with price. "We are cheaper" is the worst possible opener for a company that has just raised money: they did not raise in order to spend less, they raised to move faster, and they are afraid cheap means slow, unreliable and a management burden. Price is a closing argument, never an opening one.

A note on UK rules

General information, not legal advice. The UK operates a GDPR-equivalent data protection regime alongside PECR, the rules covering electronic marketing. In practice, business-to-business email to corporate subscribers is treated more permissively than marketing to individual consumers, which is why cold B2B email remains normal and widespread in the UK.

That is not an absence of obligations. You are still expected to be transparent about who you are and where the contact details came from, to provide a working opt-out and honour it promptly, and to handle personal data responsibly for a limited purpose. Sole traders and some partnerships are treated differently from limited companies. If you are running real volume into the UK, have the specifics reviewed by someone qualified rather than relying on a blog post — including this one.

Putting it together

1. Define the segment precisely. Stage, sector, city cluster, size. "UK startups" is not a segment.
2. Build the base list from the register. Incorporation window plus SIC codes plus active status.
3. Add the curated layer. Accelerator and university spinout portfolios matching your segment.
4. Add the timing layer. A weekly sweep of UK funding announcements.
5. Enrich and qualify. Directors, filing status, website, hiring. Kill the dormant, the dead, the agencies and the empty entities.
6. Write short and specific to a named director. One observation, one offer, one question. Two follow-ups, then out.
7. Prioritise by recency of the money. All else equal, contact the company that raised three weeks ago before the one that raised last year.

None of this requires expensive data. The register is public, the portfolios are published, the funding news is public. Automate the collection and spend the time you save on the part that decides the outcome: writing something a founder actually wants to answer.