UK IPOs: A Strategic Reset for Major Shareholders

An initial public offering (IPO) offers significant advantages for companies and their investors. It provides access to deep and diversified pools of capital, enhances liquidity over time, increases the company’s profile and, for many shareholders, represents the most effective route for realising value at scale.

For major shareholders, an IPO is more than a one-off transaction: it is a strategic reset.

The transition from private to public ownership fundamentally alters how shareholder control is exercised, how value is realised and how risk is managed. Control shifts away from privately negotiated contractual rights to governance led by an independent board and market expectations. Shareholders’ ability to realise their investment becomes staged rather than immediate. And regulatory exposure expands from a standalone transaction risk to a continuing condition.

These dynamics are coming into sharper focus in today’s market. The UK IPO market showed signs of recovery in 2025 and, with recent regulatory reform and increasing pressure on shareholders to access capital and realise investments, the appetite for listings is expected to remain strong in 2026 and into 2027.

This client alert explores how major shareholders — such as private equity sponsors, sovereign wealth funds and institutional investors — should approach a UK IPO on the Main Market of the London Stock Exchange. In our experience, three issues consistently determine outcomes: control, returns and risk. Understanding how these themes interact with each other is critical to shareholders navigating the IPO process effectively and maximising value over the life of an investment.

The IPO Life Cycle

From a shareholder perspective, a UK IPO is best viewed as a multiphase process rather than a standalone event.

• Phase 1 (Preparation). The preparatory phase begins at least six to 12 months prior to listing. Here, the company is focused on pre-IPO corporate restructuring and governance, which may include planning to implement a reorganisation of its share capital into a single class for IPO, the insertion of a new holding company and the redemption and/or refinancing existing debt. This phase typically involves aligning with advisers on public market valuation and a recalibration of governance arrangements, including how the board is constituted and reporting is enhanced, in anticipation of public company governance requirements.
• Phase 2 (Execution). The execution phase involves detailed due diligence, preparation of the prospectus and extensive investor engagement in the months leading up to listing. It is during this stage that key legal and commercial terms are negotiated and agreed, including lockup arrangements, underwriting terms and, where relevant, a relationship agreement between the company and its controlling shareholder(s).
• Phase 3 (Pricing and Listing). The pricing and listing phase happens next and involves bookbuilding, final pricing decisions and allocation of shares to investors. The company’s shares are listed and admitted to trading on the London Stock Exchange.
• Phase 4 (Post IPO). The post-IPO phase continues after listing. Major shareholders remain subject to lockup restrictions for a period of time, start to navigate continuing regulatory obligations and, where relevant, execute sell-downs in the public market after the expiry of lockups.

The Transition From Private to Public Ownership

1. Control

An IPO fundamentally alters the legal basis on which control is exercised. In a private company, shareholders rely on contractual protections detailed in shareholders’ agreements, including consent rights over key decisions, board appointment rights and enhanced information access. These arrangements provide a high degree of certainty and influence.

These contractual mechanisms are significantly diluted or fall away completely once a company goes public. While most shareholders’ agreements anticipate all eventualities for a full exit via a sale process, the IPO exit provisions are often less prescribed and so need to be agreed before the IPO is launched.

Governance shifts to a framework based on public company corporate governance requirements, such as having a majority independent board. Independent directors play a central role, and decision-making becomes subject to broader shareholder dynamics and market scrutiny. That said, major shareholders can retain board seats post-IPO if their shareholding is significant enough.

This transition is more pronounced if a shareholder (and any person with whom they are acting in concert) holds 30% or more of the voting rights. While recent reforms have relaxed the requirements on such controlling shareholders, certain constraints remain, such as the obligation for the company to operate its business independently from its controlling shareholder, and to ensure that voting to elect (and re-elect) the independent directors is approved by the independent shareholders. There is no longer a requirement for a relationship agreement between the company and its controlling shareholder(s), but our expectation is that such agreements will continue to be used.

The nature of control changes fundamentally on listing; it becomes less a matter of contractual rights and more a function of influence exercised through shareholding and engagement with the board.

2. Returns

A second defining feature of an IPO is the ability for shareholders to realise returns. While the IPO is often viewed as a one-off exit event which gives access to immediate liquidity, in practice a sell-down happens over time.

Major shareholders are usually subject to contractual lockup restrictions — commonly between six and 12 months following listing — to avoid market overhang and a decline in the company’s share price due to an excess supply of shares. Investors also want the reassurance that the company’s major shareholders have continued interest in the company. These factors limit the ability of major shareholders to sell shortly after IPO and take advantage of any share price increase.

The legal and regulatory framework reinforces these practical constraints. Share dealing disclosure obligations and restrictions imposed by the UK Market Abuse Regulation impact the ability of major shareholders to trade, particularly if they are in possession of inside information. As a result, the timing of disposals is not purely a commercial decision and must be coordinated with compliance considerations, as well as any contractual framework agreed at IPO.

IPO pricing sits at the centre of this dynamic. While there is a natural incentive to maximise proceeds at the point of listing, IPO valuations are usually at a discount to that of a private sale and public market investor demand may be subject to more variables. For this reason and those explained above, major shareholders often sell down over time to increase their average returns. Subsequent sell-downs must be executed carefully taking into account market conditions and investor appetite.

Returns are also affected by dilution at the time of the IPO and beyond. The issuance of new shares, the expansion of employee share schemes and future capital raises all impact the economic position of existing shareholders.

For major shareholders, value is not necessarily realised at IPO. Instead, it is realised over time through a sequence of exits, with pricing, timing, market conditions and regulatory constraints all playing a critical role.

3. Risk

The transition to a listed environment increases the legal and regulatory exposure of major shareholders, which continues beyond the IPO.

Major shareholders and their nominee directors may incur liability in connection with the prospectus and the offering. This exposure includes potential liability for untrue or misleading statements or omissions. While the nature and extent of any liability will depend on the shareholder’s role, the risk is typically managed through a detailed legal due diligence and verification process and carefully drafted disclaimers.

Following listing, regulatory obligations become an ongoing feature of ownership. Shareholders must comply with disclosure requirements in respect of significant shareholdings and are subject to restrictions on dealing when in possession of inside information. These obligations are underpinned by the UK Market Abuse Regulation and the Disclosure Guidance and Transparency Rules, which impose a stringent regime governing the control and use of inside information and market conduct, as well as a framework for disclosing share dealings and shareholdings by directors and significant shareholders. For major shareholders, this typically necessitates robust internal controls, including information barriers, clearing procedures and ongoing monitoring of shareholding positions.

In parallel, the UK Takeover Code (the Code) introduces a distinct and often underappreciated set of restraints on shareholdings and transaction strategy. The most significant of these is the mandatory offer threshold, under which any person (together with their concert parties) acquiring shares carrying 30% or more of the voting rights in a UK publicly traded company is required to make an offer for the entire company. The Code also contains provisions restricting share acquisitions over 30%. These rules limit flexibility on stake-building and are highly relevant for any shareholders considering increasing their position post-IPO.

Equally important are the concert party rules in the Code, under which the holdings of persons acting together pursuant to an agreement or understanding are aggregated for the purposes of the Code. For major shareholders, these rules can result in unintended consequences and, as a result, consortium or co-investor arrangements, governance rights and even informal coordination requires careful analysis.

Taken as a whole, the Code does not simply regulate public M&A transactions. It also shapes ownership strategy in a listed environment by constraining the ability to increase stakes, influences how shareholders structure their shareholdings and requires an assessment of how future transactions may be executed.

Beyond formal legal obligations, participation in the public markets introduces a broader layer of reputational and governance scrutiny. Shareholder actions are subject to scrutiny from proxy advisers, activists and other stakeholders, particularly in relation to governance and ESG. For sovereign wealth funds and other high-profile investors, these considerations can be particularly relevant.

The consequence is that an IPO transfers the regulatory risk of a company into an ongoing condition, requiring close coordination across legal, compliance and investment functions.

Key Strategic Decisions for a Major Shareholder

Against this backdrop, an IPO requires major shareholders to take a series of important strategic decisions at an early stage in the process, many of which will shape outcomes well beyond listing:

• Ownership. A central consideration is the appropriate level of ownership, including the form and extent of governance, to retain post-IPO. Shareholders must decide whether the benefits of retaining a larger stake — principally greater influence and exposure to future upside — outweigh the constraints associated with owning such a stake in a public company.
• Value. Closely linked to this is the question of liquidity strategy and exit timing. Shareholders must determine how much value to realise at listing compared to what is deferred to subsequent sell-downs. This determination requires careful consideration of investor demand and company performance. Shareholders must assess whether to sell-down at IPO based on the headline valuation or to hold and take advantage of a potentially better price in the secondary market.
• Obligations. Shareholders must consider the extent to which they are prepared for the post-IPO regulatory environment. Such preparation includes understanding the legal requirements — such as ongoing disclosure obligations and market abuse restrictions — and ensuring that appropriate internal systems and procedures are in place to manage these requirements. Meeting these obligations often requires coordination across legal, compliance and investment teams.

Major shareholders should give early and careful consideration to these decisions to ensure a successful outcome to any IPO.

Final Thoughts

An IPO should be understood not as a single transaction but as a strategic reset of a shareholder’s investment.

For major shareholders, there are three key changes. First, control shifts from contractual rights to a more nuanced form of influence. Second, returns are realised over time and not all at once. Third, risk becomes continuous and requires robust systems and proactive management.

The distinction between a successful and an unsuccessful IPO for a major shareholder is determined by how effectively they navigate these changes over the full lifecycle of public ownership.