Going Public: What UK SMEs Need To Know About Public Companies

If your business is growing fast, you’ve probably heard people talk about “going public” as the next big step.

But what is a public company in the UK, and what does it mean for a small or medium-sized business that’s used to moving quickly and keeping things private?

Becoming a public company can unlock major opportunities (more capital, bigger profile, improved credibility), but it also comes with a very different level of legal, financial and governance responsibility.

In this guide, we’ll break down what a public company is, how it differs from a private company, and what UK SMEs should think about before taking any serious steps towards an IPO or public listing.

What Is A Public Company In The UK?

In everyday business conversation, people often use “public company” to mean a company whose shares are traded on a stock exchange (for example, after an IPO).

In UK company law, it’s closely linked to whether your company is a public limited company (PLC) (a specific legal company type) and whether it can offer shares to the public. In practice, the ability to make a public offer is also constrained by UK financial services laws (for example, when a prospectus is required and who can approve it), so it’s not simply a matter of “choosing” to sell shares to the public.

Public Limited Company (PLC) In Plain English

A PLC is a type of limited company designed to raise capital from a wider investor base and, in many cases, to support a listing. A PLC structure can make it possible to offer shares more broadly, but public offers and listings come with extra legal and regulatory steps.

In contrast, most UK SMEs operate as a private limited company (often “Ltd”), where shares are held privately by founders, early investors and sometimes employees.

It’s also worth noting that there are legal prerequisites to re-register as a PLC, including (among other things):

• a minimum allotted share capital of £50,000;
• at least 25% of the nominal value of shares allotted (and the whole of any share premium) paid up;
• at least two directors; and
• a company secretary (a PLC must have one).

Those are only part of the picture, but they’re common “early blockers” for SMEs exploring a PLC pathway.

Public Company vs Listed Company

It’s important not to mix up these terms:

• Public company (PLC): a legal company type under UK law.
• Listed/traded company: a company whose shares are admitted to trading on a market or trading venue (for example, the Main Market or AIM) and which must comply with additional rules (for example, disclosure and ongoing reporting obligations).

A company can be a PLC without being listed, and “listing” (or being traded) can involve different rulebooks depending on the venue. For most SMEs, when people talk about “becoming a public company”, they’re usually talking about an IPO and admission to trading, where the compliance burden becomes very real.

Why It Matters For SMEs

If you’re running a small business, it can be tempting to treat going public as just another funding option. But it’s much bigger than that.

Going public changes how you make decisions, how you report performance, how you handle risk, and how accountable you are - not just to your founders, but to external shareholders, regulators and the market.

Why Would An SME Consider Going Public?

Going public isn’t the right move for most SMEs - and that’s not a bad thing. For many businesses, private fundraising, reinvesting profits, or strategic partnerships are a better fit.

But for some businesses, becoming a public company can be a genuine growth strategy.

Common Reasons SMEs Consider Becoming A Public Company

• Raising significant capital to expand operations, enter new markets, or invest in R&D.
• Providing liquidity for founders and early investors (meaning they can sell some shares, subject to rules and lock-ins).
• Increasing credibility with customers, suppliers and commercial partners.
• Using shares as “currency” for acquisitions and growth deals.
• Building an employee equity story that’s easier to value (though it comes with added complexity).

A Quick Reality Check: Going Public Isn’t Just “Fundraising”

A public listing is not simply a bigger version of a private capital raise.

You’ll usually need:

• more mature internal systems (finance, reporting, governance);
• a business model that can handle ongoing scrutiny; and
• a willingness to share information publicly that you previously kept confidential.

If your competitive advantage relies heavily on secrecy (for example, sensitive pricing models, supplier arrangements, or a “stealth” product strategy), you’ll need to think carefully about whether public company life fits your strategy.

Public Company vs Private Company: Key Differences SMEs Should Understand

If you currently run an Ltd, the shift to a public company mindset can be bigger than the legal paperwork.

Here are the differences that most impact SMEs day-to-day.

1) Ownership And Control Gets More Complex

With a private company, ownership is usually concentrated among a relatively small group (founders, angel investors, maybe a fund).

With a public company, ownership can become more dispersed - and with that comes:

• greater pressure to satisfy shareholder expectations;
• more scrutiny of director decisions; and
• potential activism or voting blocs (depending on your shareholder base).

This is one reason it’s crucial to get your internal governance aligned early - including reviewing your Company Constitution and making sure your share rights and decision-making rules match your growth plans.

2) Reporting And Disclosure Requirements Increase

Private companies have reporting obligations (for example, annual accounts and confirmation statements), but listed/traded companies are typically held to much higher standards and timetables.

Depending on where and how you list, you may need to comply with additional ongoing obligations around:

• financial reporting and market announcements;
• disclosure of price-sensitive information;
• related party transactions;
• director dealings and internal controls.

This isn’t just “more admin” - it can affect how you handle contracts, negotiations and even product announcements.

3) Governance Expectations Are Higher

When you become (or move towards) a public company, governance becomes less informal and more structured.

For SMEs used to fast decisions over Slack or in founder meetings, the adjustment can feel uncomfortable at first. But good governance is also what helps you scale safely and stay investable.

4) You’ll Spend More On Advisors And Compliance

Becoming a public company is not a “one-off cost”. It’s an ongoing operating model.

Common ongoing costs include professional support across legal, accounting, tax, company secretarial, and regulatory compliance - plus time and resource costs internally.

This doesn’t mean you shouldn’t do it. It just means you should go in with open eyes and a realistic plan.

What Does It Take To Go Public? A Practical UK Roadmap

The exact path will depend on your business, your sector, and which market you want to list on. But most SMEs move through a similar set of phases.

Think of this as the “big picture” checklist.

1) Sanity Check Your Structure And Share Capital

Before you can seriously pursue becoming a public company, you need to confirm your current structure is fit for purpose.

That may involve:

• reviewing existing share classes (ordinary shares, preference shares, growth shares, etc.);
• checking shareholder consents and veto rights; and
• cleaning up anything that could spook investors (for example, unclear IP ownership or disputed equity).

It may also involve planning for the PLC minimum capital and “paid up” requirements (if you’re moving towards PLC status), and making sure your capital structure won’t create friction with institutional investors later.

If you’re still early-stage, getting the fundamentals right at the beginning can save a lot of pain later - including making sure you’ve properly set up and maintained your company from day one (for example, if you’re still working through how to Register A Company or you’ve outgrown your initial structure).

2) Get Investment-Ready (Not Just Pitch-Ready)

Public markets and institutional investors will expect consistency, clarity and evidence.

That usually means tightening up:

• financial records and forecasting;
• key commercial contracts (customers, suppliers, partners);
• employment arrangements, especially senior leadership incentives; and
• ownership of key assets like IP and data.

If you’re hiring to scale, it’s also worth making sure your Employment Contract approach is consistent and properly protects the business - because investors will often scrutinise people risk more than founders expect.

3) Due Diligence: Assume Everything Will Be Examined

“Due diligence” is the process where lawyers and other advisors review your company to identify risks and confirm the business is what it says it is.

For SMEs, due diligence often highlights issues like:

• missing or informal contracts (especially with key suppliers or contractors);
• unclear IP ownership (especially if early work was done by freelancers);
• data protection gaps (common for online businesses);
• non-compliance with sector-specific rules; and
• shareholder arrangements that block future fundraising.

If you collect customer data, marketing data, or employee data, privacy compliance is a must-have. A clear Privacy Policy and good internal data practices help reduce risk and improve trust.

4) Decide On Your Fundraising And Listing Strategy

There’s a big difference between:

• raising another private round; and
• raising capital through a public offer and/or admission to trading.

At IPO stage, you’ll also need to consider the legal and regulatory mechanics (for example, whether a prospectus is required and approved, what ongoing disclosure regime applies, and how your timetable works with advisers and the chosen market).

Even if you’re not listing tomorrow, you may still need to set your fundraising documents up in a way that doesn’t accidentally create problems later.

At this stage, it’s common to formalise the commercial deal terms early through a Term Sheet, and then move into binding investment documentation, such as a Share Subscription Agreement.

If you’re planning a larger capital raise, aligning expectations early with a structured Fundraising Term Sheet can save a lot of renegotiation later.

5) Prepare For Ongoing Public Company Life

This is the part that often gets underestimated.

Going public means you’ll need systems and habits for:

• timely reporting and governance;
• documenting key decisions properly;
• handling conflicts of interest; and
• communicating with investors and the market carefully.

In other words: it’s not just about getting listed - it’s about staying compliant and credible after the listing excitement wears off.

Legal Documents And Governance You’ll Need Before You Go Public

If you’re considering becoming a public company, your legal foundations matter more than ever.

The market will expect your documents to be consistent, enforceable and aligned with your growth strategy - not stitched together from generic templates.

Shareholder Arrangements: Align Everyone Before The Pressure Hits

SMEs often have shareholders who joined at different times, on different terms. That can be fine while things are calm - but it can get messy when you’re moving towards a public company pathway.

A solid Shareholders Agreement can help set clear rules around:

• how decisions get made (including reserved matters);
• share transfers and exits;
• drag-along and tag-along rights; and
• what happens if a founder leaves or relationships break down.

If you’re heading towards a future public company structure, it’s especially important to understand which rights are market-standard and which ones could deter later investors.

Articles Of Association: Your Rulebook Needs To Match Your Growth

Your articles of association are essentially your company’s internal rulebook.

Many SMEs set them once at incorporation and never look again. But if you’re thinking about becoming a public company (or even raising significant investment), you should review whether your Company Constitution matches your current reality.

This can include issues like:

• different share classes and voting rights;
• board appointment and removal rules;
• dividend mechanics; and
• share transfer restrictions (which may need to change as you approach a listing).

Board And Decision-Making Documents

As you scale, you’ll want better documentation around:

• board meetings and resolutions;
• delegations of authority;
• conflicts of interest procedures; and
• committee structures (common in larger companies).

This might feel “corporate”, but it’s often what prevents disputes and keeps your directors protected when the stakes are higher.

Employment And Incentives

Public company readiness isn’t just about shareholders - it’s also about your people.

As you grow, your team and leadership arrangements should be consistent, compliant, and clearly documented. This typically includes:

• well-drafted Employment Contract terms for key hires;
• confidentiality and IP protection clauses;
• clear bonus/commission structures; and
• equity incentives that don’t create unmanageable obligations later.

Data Protection And Digital Compliance

If you’re a tech-led SME (or you collect personal data through your website, platform, or marketing), privacy compliance becomes even more important when you’re under market scrutiny.

Having a clear Privacy Policy is one part of it - but you should also make sure your actual practices match what you say you do (for example, data security, lawful marketing, and retention policies).

Important Note: Public Company Decisions Are Not “One-Size-Fits-All”

The best public company pathway (and the best legal structure) will depend on your goals, sector, ownership profile and growth plan.

That’s why it’s worth getting tailored legal advice early - ideally before you start making promises to investors or building timelines around a potential listing.

Key Takeaways

• A UK “public company” is commonly associated with a PLC and the ability to raise capital from a wider investor base, often alongside admission to trading.
• PLC status has legal prerequisites (including minimum share capital and paid-up requirements), and public offers/listings typically involve additional regulatory steps.
• For SMEs, going public can unlock capital and credibility, but it also creates ongoing obligations around reporting, governance and disclosure.
• The shift from private to public company life affects control, decision-making, and how you manage commercial risk day-to-day.
• Before going public, it’s crucial to get investment-ready: clean up your contracts, ownership (especially IP), compliance, and internal governance.
• Your legal documents need to support growth - including your articles of association, shareholder arrangements, and investment documents.
• Public company planning is not a DIY project; getting the structure right early can prevent expensive delays and disputes later.

General information only: This article is for general information and doesn’t constitute legal, financial, accounting or tax advice. Always get professional advice tailored to your business before taking steps towards a PLC, IPO or listing.

If you’d like help getting your business ready for investment or mapping out the legal steps towards becoming a public company, you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.