What the FCA actually does for small-cap investors, and what it doesn’t

When most people think about investment regulation in the UK, they picture something comprehensive — a network of rules that catches bad actors, levels the playing field, and generally keeps things fair. The reality, particularly at the smaller end of the market, is considerably more complicated.

The Financial Conduct Authority (FCA) is the main regulatory body overseeing financial markets and firms in the UK. Its remit covers everything from high street banking to the conduct of listed companies, and it has real powers: it can fine firms, ban individuals from working in financial services, suspend trading in shares, and refer cases to the Crown Prosecution Service for criminal prosecution. On paper, it is a formidable institution. In practice, for investors in small-cap companies, particularly those listed on AIM (the Alternative Investment Market), the FCA’s presence is felt unevenly at best.

AIM itself is a relatively light-touch market. Unlike the Main Market of the London Stock Exchange, which falls directly under the FCA’s listing rules, AIM operates under its own rulebook — administered by the London Stock Exchange — and companies on AIM are not subject to the full weight of the UK Listing Rules that apply to larger companies. This is not an oversight. AIM was designed to be accessible, which means faster listing timelines, lower costs, and less regulatory friction. The trade-off is that investor protections are not as robust.

The cornerstone of the regulatory framework that does apply across both markets is MAR — the Market Abuse Regulation. Inherited from EU law and retained in UK domestic legislation after Brexit, MAR sets the rules around insider dealing and market manipulation. It prohibits trading on material non-public information, prohibits the deliberate spreading of false information to move share prices, and obliges companies to disclose inside information to the market as soon as they become aware of it. These are serious obligations, and breaches can carry criminal penalties.

In practice, enforcing MAR in the small-cap space is genuinely difficult. Insider trading is notoriously hard to prove because it requires demonstrating both that the trader possessed inside information and that they used it. Volume spikes ahead of company announcements — a pattern that any experienced small-cap investor has noticed more than once — rarely result in prosecutions. The FCA investigates, and occasionally fines individuals or firms, but successful prosecutions in the small-cap space are uncommon. That does not mean nothing is being done, but investors should not assume that unusual price movements before news always lead to consequences for those responsible.

One of the most useful tools available to small-cap investors is the Regulatory News Service, usually referred to simply as the RNS. This is the system through which AIM and Main Market companies are required to disclose material information to the market simultaneously, meaning no investor should receive price-sensitive news before any other. RNS announcements cover everything from trading updates and financial results to board changes, significant contract wins, and resource estimates. Getting into the habit of reading RNS announcements carefully is one of the practical skills that separates informed small-cap investors from those who rely on secondhand summaries.

Reading RNS announcements is not simply a matter of checking the headline. The language companies use matters, and experienced investors learn to notice when the framing of an announcement does not quite match its substance. An update described as “encouraging” that reveals flat revenues, or a trading statement that stresses milestones achieved while burying a cash raise, repays careful reading. The timing of announcements also carries information. Late Friday releases, published after market close when press coverage is minimal and most investors are not watching their screens, have historically been associated with news companies would rather not draw attention to. This is not a rule, but it is a pattern that has proven reliable often enough to be worth noting.

The Nominated Adviser, or Nomad, is another element of the regulatory architecture specific to AIM. Every AIM-listed company is required to retain a Nomad, a firm approved by the London Stock Exchange to act as a kind of regulatory guardian. The Nomad’s role is to ensure the company meets its AIM obligations, advise it on disclosure requirements, and vouch for its suitability to remain listed. When a company changes its Nomad, particularly at short notice or without explanation, it is a signal worth pausing over. Nomad firms protect their own reputations, and a departure can indicate that the adviser has become uncomfortable with the direction a company is taking.

Selective disclosure, the practice of sharing material information with certain investors or analysts before making it public, remains technically prohibited under MAR, and the FCA has taken action against it in a number of cases. However, the informal networks that characterise parts of the small-cap investment world mean it continues to occur. Information shared in private briefings, or in conversations at investor conferences, does not always reach every investor at the same time. Being aware that this dynamic exists is not a reason to avoid small-cap investing, but it is a reason to pay attention to unusual trading patterns and to view information that appears to have circulated ahead of an announcement with appropriate scepticism.

Understanding how regulation actually operates in the small-cap space leads to a practical conclusion: investors need to do more work, not less. The regulatory framework provides a floor, not a ceiling. It catches the most egregious conduct and sets basic disclosure standards, but it cannot substitute for careful reading of company announcements, attention to timing and language, and a clear-eyed view of what the rules require versus what they can realistically enforce.

This post is drawn from The Little Book of Small-Caps by Cameron Oliver. Republished with permission.

Small Caps is a series drawn from first-hand experience of UK and global small-cap markets, updated as each new chapter arrives.

Disclaimer: The value of investments can go down as well as up, and you may get back less than you invest. This article is for informational and educational purposes only and does not constitute financial advice. Always do your own research and consider seeking independent advice before making any investment decision.