IPOs Explained by Robert Kovacs at Northern Index: What UK Investors Need to Know Before a Company Goes Public

Few events generate as much excitement in financial markets as an Initial Public Offering, explains Robert Kovacs at NorthernIndex.com. The prospect of getting in early on a company before it lists on a major exchange has captured the imagination of retail and institutional investors alike, from the dot-com boom of the late 1990s to more recent listings in the technology and renewable energy sectors. Yet for all the headlines and hype, IPOs remain one of the most misunderstood instruments in the investing world.

As an analyst who spends a considerable amount of time speaking with UK-based clients about market opportunities, I find that the same questions come up again and again: What exactly is an IPO? How is it priced? And, most importantly, is it actually a good idea to invest in one? This article aims to walk through the mechanics of an IPO from start to finish, and to offer a grounded, realistic perspective on the opportunities and risks involved.

What Is an IPO, Exactly?

An Initial Public Offering is the process through which a privately-owned company offers shares to the public for the first time, transitioning from private to public ownership. Before an IPO, a company’s shares are typically held by its founders, early employees, venture capital firms, and private equity investors. Going public allows the company to raise capital from a much broader pool of investors by listing its shares on a stock exchange, such as the London Stock Exchange, the New York Stock Exchange, or NASDAQ.

The motivations behind going public vary. Some companies pursue an IPO to raise funds for expansion, research and development, or paying down debt. Others do so to provide an exit route for early investors and founders, allowing them to realise the value they have built over years, sometimes decades. In some cases, going public is also a matter of prestige and visibility, as a listing can enhance a company’s credibility with customers, suppliers, and future business partners.

The Mechanics: How an IPO Actually Happens

The road to an IPO is long, tightly regulated, and involves several distinct stages.

1. Selecting underwriters. The company appoints one or more investment banks to act as underwriters. These banks are responsible for structuring the offering, conducting due diligence, and ultimately helping determine how many shares will be sold and at what price.
2. Regulatory filing. In the UK, a company seeking to list must publish a prospectus that has been approved by the Financial Conduct Authority (FCA), containing detailed information about the business, its financials, its risks, and its management team. In the US, the equivalent process involves filing an S-1 registration statement with the Securities and Exchange Commission (SEC).
3. The roadshow. Company executives, together with the underwriters, present the business to institutional investors in a series of meetings known as a roadshow. The purpose is to generate interest and gauge demand, which in turn informs the pricing of the offering.
4. Pricing and allocation. Based on investor demand gathered during the roadshow, the underwriters and the company agree on a final offer price. Shares are then allocated, typically with institutional investors receiving the bulk of the allocation, though some IPOs do include a retail tranche.
5. The listing. On the day of listing, the shares begin trading on the open market. This is the moment most retail investors associate with an IPO, even though, as outlined above, a great deal has already happened behind the scenes.

Why IPO Shares Are Often Volatile in the Early Days

One of the defining characteristics of newly listed shares is volatility. It is not unusual to see a stock swing significantly in either direction within the first days or weeks of trading. There are several reasons for this.

First, price discovery is still taking place. Unlike an established public company with years of trading history, a newly listed business has no long-term chart for the market to reference. Investors are essentially forming a consensus on fair value in real time.

Second, there is often an imbalance between supply and demand immediately after listing. A relatively small proportion of total shares may be available to trade in the initial period, particularly where founders, employees, and early investors are subject to lock-up agreements that prevent them from selling for a set period, commonly 90 to 180 days. When those lock-ups expire, a fresh wave of shares can enter the market, sometimes putting downward pressure on the price.

Third, sentiment plays an outsized role. Media coverage, analyst commentary, and broader market conditions can all move a newly listed stock disproportionately compared with a more established company, simply because there is less of a track record to anchor expectations.

Common Misconceptions

There is a persistent belief that buying into an IPO guarantees a quick profit. The reality is considerably more nuanced. Academic research into IPO performance has long shown a mixed picture: while some listings do produce a “pop” on the first day of trading, a meaningful number of companies underperform the broader market in the months and years that follow their listing. The excitement of a new listing does not, on its own, translate into sound investment fundamentals.

Another common misconception is that retail investors have the same access as institutional investors. In most traditional IPO structures, retail participation is limited, and by the time an average investor can buy shares on the open market, the price may already reflect a significant premium over the original offer price.

Finally, many investors assume that a well-known brand name automatically makes for a sound investment. Brand recognition and business fundamentals are not the same thing. A company can have significant public awareness while still carrying a high valuation, thin profit margins, or an unproven business model.

What UK Investors Should Consider

For UK-based investors weighing whether to get involved with an IPO — whether through a direct allocation, a specialist IPO fund, or by trading the stock once it lists — a few principles are worth bearing in mind:

• Read the prospectus. It is dense, but it contains the clearest picture of the company’s financial health, risk factors, and use of proceeds.
• Understand the lock-up schedule. Knowing when insiders are free to sell can help explain future volatility.
• Assess the valuation, not just the story. A compelling narrative does not always align with a reasonable price-to-earnings or price-to-sales ratio relative to peers.
• Consider your time horizon. Short-term trading around a listing carries different risks than holding a position for the long term.
• Concentrating capital in a single new listing, however promising, increases exposure to company-specific risk.

A Final Word

IPOs will always occupy a unique place in financial markets. They represent a moment where a company steps from the private world into public accountability, and where investors are given the opportunity, and the responsibility, to assess a business on its own merits rather than relying solely on market hype. As with any investment decision, the companies that reward patient, informed investors tend to be those that were evaluated with the same rigour as any other listed business, rather than treated as a one-off event to be chased.

The value of investments can fall as well as rise, and past performance is not a reliable indicator of future results. This article is provided for general informational purposes and does not constitute investment advice or a personal recommendation.

About the Author

Robert Kovacs is a Market Analyst at Northern Index, where he covers equity markets, IPO activity, and broader macroeconomic trends for clients across the UK. With a background in financial markets analysis, Robert focuses on translating complex market events into clear, practical insight for both new and experienced investors.

About Northern Index

Northern Index provides clients with access to global financial markets, combined with research, analysis, and educational content designed to support informed decision-making. The Northern Index team is committed to helping traders and investors navigate market events — from major economic data releases to corporate listings — with clarity and confidence.

Disclaimer: This article is for informational purposes only and is not financial or investment advice. IPOs involve risks, and share prices can rise or fall. Investors should conduct their own research and consider seeking professional financial advice.