Public vs Private Companies In the UK: Key Differences

If you’re building a startup or growing a small business, choosing the right company structure can feel like one of those “big, adult” decisions you’re supposed to get right from day one.

And when you start Googling the difference between public and private companies, it’s easy to end up in a rabbit hole of jargon about stock markets, disclosures and “listing requirements” that doesn’t feel relevant when you’re just trying to hire your first team member or raise a seed round.

The good news is: for most small businesses in the UK, the choice isn’t as complicated as it first looks. But the differences between a private company and a public company do matter - especially if you’re planning to raise money, bring in new shareholders, or scale fast.

Below, we break down public vs private companies in plain English, with a practical focus on what this means for founders and growing businesses.

What Do We Mean By “Public vs Private” In The UK?

In the UK, “public vs private” usually refers to two different legal types of company:

• Private limited company (often “Ltd”) - typically used by startups and SMEs.
• Public limited company (a “PLC”) - often used by larger businesses that want to raise capital from the public, including via stock market listing.

These are both incorporated under the Companies Act 2006, but they’re built for very different stages of growth and very different fundraising goals.

It’s also worth clearing up a common misunderstanding: a company can be “public” in the sense that its information is publicly searchable on Companies House, but that doesn’t make it a public limited company. Many private companies still have publicly available filings.

So, when people search “private vs public”, they’re usually asking:

• Do I want a normal private limited company (Ltd) structure?
• Or do I need a PLC structure because I’m planning to offer shares to the public (often as part of a listing)?

Private Limited Company (Ltd): The Usual Starting Point For Startups

If you’re early-stage - validating your idea, launching a product, hiring a small team, and raising funds privately - a private limited company is the structure most founders choose.

In a private company, shares are generally held by founders, employees (sometimes), angel investors and/or venture investors - but shares aren’t offered to the public at large.

Why Most Startups Choose A Private Ltd

• Limited liability - the company is a separate legal entity, which can reduce personal risk for shareholders (subject to exceptions and how you operate).
• Familiar to investors - most UK angel and VC investment is made into private companies.
• More control over ownership - it’s easier to restrict share transfers and manage who can become a shareholder.
• Lower cost and complexity compared to PLC structures.

If you’re at the stage of incorporating, you’d usually start by register a company and then tailor the internal documents so they match how you actually want the business to run (not just the default templates).

What “Private” Means In Practice

Being “private” doesn’t mean your business is secret - it mainly means your shares aren’t freely offered to the public.

Most private companies also:

• have fewer ongoing governance requirements than PLCs
• can make many decisions through shareholder resolutions without the same level of market scrutiny
• have more flexibility around how they structure investment and shareholder rights

Public Limited Company (PLC): When “Public” Actually Matters

A public limited company (PLC) is usually designed for businesses that are much further along - often with significant revenues, larger teams, and a clear plan to raise money at scale.

A PLC can offer shares to the public, and it’s the structure typically used if you’re looking to list on a stock exchange (though listing is a separate layer of regulation on top of being a PLC).

Why A PLC Is Usually Not A “Day One” Choice

For most startups, forming a PLC early is a bit like buying a double-decker bus for your first driving lesson. It’s not that it’s impossible - it’s just rarely the most efficient move.

PLCs typically involve:

• higher administrative burden
• more formal governance expectations
• greater transparency and reporting demands
• a higher bar for capital structure and ongoing compliance (especially if listed)

They also come with some specific legal requirements that don’t apply to private companies. For example, a PLC must have a minimum allotted share capital of £50,000 (or the euro equivalent), and before it can start trading or exercising borrowing powers it will generally need to meet paid-up capital requirements and obtain a trading certificate.

If you’re thinking about going public eventually, it’s usually more realistic to build as a private company first, then convert later once your business is ready.

Public vs Private: The Key Differences That Matter For Small Businesses

Let’s get practical. When founders compare public vs private companies, these are the differences that tend to impact day-to-day decision-making, fundraising and long-term planning.

1) Shareholders And How Shares Can Be Transferred

Private company: Typically restricts share transfers (for example, requiring board approval or giving existing shareholders first refusal). This is a big deal for startups because it helps you keep control of the cap table and avoid unexpected shareholders.

Public company: A PLC can be set up to facilitate wider share ownership and (in many cases) easier transfers, but “free transferability” isn’t automatic - the rules still depend on the company’s Articles of Association and, if the company is listed, the relevant market rules and settlement systems. In practice, listed shares are generally much more liquid than private company shares, which is often the commercial driver for going public.

If you’re raising money privately, you’ll often document shareholder rights and transfer rules in a Shareholders Agreement, alongside your company’s constitutional documents.

2) Fundraising Options (And Investor Expectations)

Private company: You can raise money from founders, angels, VCs and private funds. You’ll usually issue shares to a small group of known investors, often with negotiated rights (like preference shares, anti-dilution, or board seats).

Public company: A PLC can raise money from a wider pool of investors and, if listed, may access public markets for larger capital raises. But it’s a major step up in complexity, regulation and scrutiny.

For private fundraising, a properly documented investment round usually involves (at a minimum) clear subscription terms - commonly set out in a Share Subscription Agreement - and it’s often negotiated off the back of a Term Sheet so everyone is aligned before the heavy documents are finalised.

3) Governance And Decision-Making

Private company: Governance can be simpler and more tailored, particularly while you’re founder-led. You still need to follow company law and your internal rules, but you can usually keep things lean (without cutting corners).

Public company: Governance tends to be more formal. Some PLC requirements apply even without a listing (for example, a PLC must have at least two directors and a qualified company secretary). If the company is listed, there are often additional expectations around independent directors, committees, disclosures, and how decisions are communicated to shareholders and the market.

Even in a private company, it’s smart to treat governance as part of your “scale-ready” foundations. For example, keeping clean board records and meeting minutes can make fundraising, due diligence and major decisions much smoother later.

4) Reporting, Transparency And Public Scrutiny

Private company: You’ll still file accounts and confirmation statements with Companies House, and certain information is publicly available. But you usually have more privacy and less public scrutiny compared to listed businesses.

Public company: Being a PLC can involve higher stakeholder expectations, and if listed the level of transparency increases significantly (financial reporting, market announcements, insider information controls, and more). The biggest jump in “public scrutiny” typically comes from being listed, not simply from being a PLC.

If your business plan involves sensitive IP, early-stage pivots, or confidential commercial arrangements, you’ll typically find a private structure easier to manage while you grow.

5) Legal Setup And Ongoing Costs

Private company: Lower costs to set up and operate, with more flexibility. Most founders can incorporate quickly, then invest in getting the right documents in place once the business model and ownership plan are clear.

Public company: Higher professional costs and more ongoing compliance. If you’re also pursuing a listing, you’ll usually need extensive advisory support (legal, financial, regulatory) and a business that can handle those overheads.

One thing that’s true across both: your company’s constitution matters. Your Articles of Association help set the rules for things like share rights, director powers and decision-making - and for startups, the “standard” template often needs tailoring to match investment terms and founder protections.

Which Structure Should You Choose If You’re A Startup Or SME?

For most readers weighing up public vs private companies, the real question is: “What structure supports my growth goals without creating unnecessary admin right now?”

Here’s a practical way to think about it.

A Private Ltd Is Usually Right If You Want To…

• launch quickly and keep compliance manageable
• raise money privately from angels or VCs
• protect founder control (at least in the early stages)
• offer equity incentives to employees (where appropriate)
• stay flexible while the business evolves

A PLC Might Make Sense If You Want To…

• raise significant capital from a wide pool of investors
• work towards an IPO or other public market strategy
• build a structure designed for share liquidity and large-scale ownership
• signal maturity and scale to the market (and can support the compliance load)

If you’re unsure, you don’t need to guess. The “right” answer depends on your funding model, your growth timeline, and how you want control and risk allocated between founders, investors and directors.

Can You Switch From Private To Public Later (And What Should You Plan For Now)?

Yes - a business can typically re-register from a private company to a PLC later.

For many startups, that’s the most sensible path:

• Start private while you validate the business and raise early rounds.
• Build strong governance and clean records as you scale.
• Convert to a PLC when the business (and your capital strategy) genuinely needs it.

Even if a PLC is years away, what you do now can either make that future transition easier or much harder.

What To Put In Place Early So You’re “Investor Ready”

When you’re building your legal foundations, the goal is to avoid messy cap tables, unclear decision-making, and documents that don’t match what you’ve promised to investors or advisors.

Key steps usually include:

• Clear ownership and share structure (including what happens when someone leaves).
• Properly documented investment rounds (rather than informal agreements in email chains).
• Decision-making processes that are followed in practice, not just in theory.
• Clean execution of important documents (especially where deeds are used).

On that last point, execution errors are more common than you’d think - and they can cause real headaches during due diligence. Getting comfortable with executing contracts and deeds properly can save a lot of back-and-forth later.

A Quick Note On “Public” Fundraising And Marketing

One area founders can accidentally trip up is promoting investment opportunities too broadly. If you’re raising money privately, you’ll want to be careful about how you describe and market the opportunity, who you approach, and what you publish publicly.

In the UK, many investment offers and marketing materials can fall under the financial promotions regime, and there may be restrictions on who you can communicate them to and how (with different rules depending on the audience and the structure of the offer). This is a complex area and getting it wrong can create regulatory risk, so it’s worth getting tailored advice before you “go loud” with a fundraising campaign.

Key Takeaways

• In the UK, “public vs private” usually means PLC vs private Ltd - and most startups begin as private limited companies.
• A private Ltd is generally more flexible, lower-cost, and better suited to founder-led businesses raising money from angels and VCs.
• A PLC is typically for later-stage businesses that want to raise capital from the public and/or pursue a listing - with higher compliance and governance demands (including minimum share capital and trading certificate requirements).
• The biggest practical differences between public and private companies include share transfer rules (often driven by articles and listing status), fundraising pathways, governance formality, and transparency requirements.
• Even if you plan to “go public” one day, you can usually start private and convert later - but clean legal documents and good governance now make that future transition far easier.
• To protect your business as it grows, key documents like your Articles of Association and Shareholders Agreement should be tailored to your ownership and funding plans (not left as generic templates).

If you’d like help choosing the right structure or setting up your company for investment (without overcomplicating things), you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.