The Silent Majority: Why Britain's Family Businesses Are the Overlooked Engine of AIM and the Main Market

London's capital markets have had more regulatory attention in the past two years than at any point since Big Bang. The Listing Rules have been rewritten. AIM has just undergone its most comprehensive rule change in thirty years. The Financial Conduct Authority (FCA) has stripped out IPO process friction that it now accepts served no purpose. PISCES has four approved operators and a growing transaction pipeline. Notwithstanding all of this activity, the conversation has been almost entirely about the plumbing. Very little has been said about the companies these reforms are supposed to help. 

Anyone who spends time working through shareholder registers on sub-£350 million market cap mandates will recognise the pattern. Founders who retain controlling stakes. Families whose trusts hold the largest blocks. Second-generation directors whose shareholdings arrived by inheritance rather than investment. The controlling shareholder is not a fund manager in Mayfair but a family in the Midlands, or a founder who still walks the factory floor, or a trust structure set up by a grandparent decades ago that now sits awkwardly across the company's public market obligations. 

These companies are the silent majority of the UK's growth markets and here is a gap between the advisory ecosystem that is supposed to support them and the reality of what they actually need that has been hiding in plain sight for years.

The structural gap 

Any Nomad, Sponsor or financial adviser who has tried to assemble the right legal team around a founder-led mandate will recognise the challenge. The problem is not the quality of the available lawyers. The problem is how law firms are organised. The large corporate practices that dominate London's ECM league tables are excellent at what they do, but their model is built around institutional issuers: companies whose shareholders are funds, whose governance is driven by proxy advisers, and whose capital markets activity follows a predictable rhythm of annual results, placings, and the occasional rights issue. 

When a founder-led or family-owned company arrives on their doorstep, those same firms face a structural difficulty. The corporate team knows how to run an IPO. The private client team, (if they have one) often in an entirely separate practice, knows how to advise on trust structures and inheritance tax planning. However, the two sit in different departments, on different floors, often in different buildings. They bill separately. They have different partners and they almost never work together on the same transaction, because the firm's systems are not designed for it. The intermediaries who refer these mandates know this, because they are the ones left trying to co-ordinate across teams that were never set up to collaborate. 

This matters because the issues that define an ownership-led listing are precisely the issues that fall between those two teams. Concert party analysis across family members, trusts, nominees, and connected vehicles is a Takeover Code question, but it cannot be answered properly without understanding the trust structures. Pre-IPO reorganisation of share capital requires corporate expertise, but the tax consequences for the founder and their family require private client input that most corporate teams do not have. Relationship agreements, lock-up carve-outs, PDMR notification obligations for family members who sit on the board, all of these are hybrid problems that demand integrated advice. 

The market has known this for years. What has changed is that the regulatory environment has finally caught up with the reality. 

A regulatory landscape that now recognises the founder 

On 5 August this year, two things happened on the same day that, taken together, represent a significant recalibration of the UK's growth company infrastructure. 

The London Stock Exchange published AIM Notice 64, confirming the most comprehensive reforms to the AIM Rules since the market's inception. Every major proposal from the June consultation was adopted, with overwhelming support across all responses. The reforms are now live. The FCA, on the same date, published Policy Statement PS26/16, removing the seven-day waiting period between prospectus publication and connected research during equity IPOs, and eliminating the unconnected analyst framework that had been in place since 2018. The FCA's own conclusion was frank: the 2018 rules had produced "no demonstrable benefits" while adding "market risk and costs for companies" and potentially placing the UK "at a competitive disadvantage compared with other jurisdictions." 

That co-ordinated signal matters. It tells the market that both the exchange operator and the regulator understand that the friction in the UK listing process has been too high, and that the companies most affected by that friction are precisely the growth-stage, founder-led businesses that the UK economy most needs to support. 

The AIM reforms in particular read as though they were drafted with the silent majority in mind. Special voting shares are now formally permitted on admission, allowing founders and pre-IPO investors to retain enhanced voting control with no mandatory sunset provisions. The working capital statement, which added cost and complexity that was disproportionate for smaller issuers, has been replaced by a disclosure-based regime. UK GAAP is now accepted for UK-incorporated companies, removing the unnecessary expense of IFRS compliance for businesses that do not need it. A new “Capital Access Window” has been created, allowing AIM companies to request a temporary suspension during a fundraise, giving boards breathing room to execute without the share price volatility that has long made mid-market equity raises unnecessarily stressful. On 30 September, Avacta Group, the AIM-listed biotech, became one of the first companies to deploy the Capital Access Window in practice, entering a voluntary trading pause to support a proposed equity fundraise. On the same morning, Ondine Biomedical did the same. The mechanism is already being used exactly as the LSE intended. 

Perhaps most telling is the governance reform. AIM companies are no longer required to adopt a named corporate governance code or report against it on a comply-or-explain basis. AIM Notice 64 was unusually candid about the reason: "the market feedback has been overwhelming that the current 'comply or explain' regime against a recognised code has become a 'comply only' regime and companies do not feel they have agency in practice to explain their approach to governance." That is a remarkable admission from the exchange. 

The PISCES dimension 

Alongside these structural reforms, the emergence of the PISCES framework has added a new layer to the landscape. The Private Intermittent Securities and Capital Exchange System now has four approved operators i.e. the LSE's own Private Securities Market, JP Jenkins, Asset Match, and Vestd and the transaction chronology of 2026 tells its own story. 

The first PSM transaction was completed by TPE in March, using Oxford Science Enterprises as the underlying asset. Wayve followed in July with an $85 million employee tender, the largest PISCES transaction to date and the first employee liquidity event on the platform. Moneybox ran a PISCES-enabled secondary share sale through Crowdcube in the same month, valuing the company at approximately £800 million. In August, Wadworth & Co, a 150-year-old independent brewer with a family and employee shareholder base, became the first company to trade on Asset Match's PISCES platform. 

The institutional interest is following. In September, City AM reported that JP Morgan is seeking approval to become a registered auction agent on the LSE's Private Securities Market, joining Bank of America and Rothschild as intermediaries positioning themselves to broker deals on the platform. When banks of that calibre start building infrastructure around a new market, it is no longer a pilot. 

However, it is the Wadworth transaction that should make the advisory community sit up. A family-owned brewer with no intention of pursuing an IPO, accessing regulated secondary liquidity through a periodic auction. That is not a venture capital exit story. That is a private company liquidity story, and it is exactly the kind of transaction that the silent majority of the market has been waiting for. The shareholders who need it most, long-serving employees, family members who want partial liquidity without selling the business, trust structures that need to rebalance,  have historically had no regulated route to achieve it. PISCES is beginning to change that, although the ecosystem is still young and the infrastructure around it, particularly on price discovery and disclosure, has genuine gaps that will need to be addressed. 

What this means in practice 

The question for founders, families, and their advisers is not whether the regulatory environment is moving in the right direction. It plainly is. The question is whether the advisory model they rely on is equipped to help them navigate it. 

A founder considering an AIM/Main market admission today faces a set of decisions that are qualitatively different from those facing an institutional issuer. The dual-class share structure question is now live and codified. The concert party analysis,  across family members, trusts, nominees, and connected vehicles, has become more, not less, complex, particularly in light of the Takeover Panel's current consultation on the definition of "acting in concert," which closes on 2 October and proposes amendments that directly affect how lock-up arrangements and voting agreements are assessed. The relationship agreement is now optional rather than mandatory for Main Market issuers with a controlling shareholder, which means getting it right is a matter of commercial judgement rather than regulatory box-ticking. The post-IPO phase, lock-up expiry, sell-down strategy, MAR compliance, wealth structuring, and eventually succession planning, requires the kind of integrated, long-term advisory relationship that most transaction-focused firms are not structured to provide. 

The law firms that will win these mandates are the ones that can advise across all of those dimensions as a single team, rather than handing the founder from one department to another as the transaction progresses. Having advised on transactions ranging from founder-led AIM /Main admissions to take-privates, and more recently on the first PISCES share sale, the team at Charles Russell Speechlys have seen first-hand how the complexity multiplies when ownership, trust structures, and public market obligations intersect. The integrated model is not a marketing proposition. It is the only way to avoid the gaps that catch people out. 

Looking ahead 

The silent majority is not going to remain silent for much longer. The regulatory reforms of 2026 have lowered the barriers to entry, increased the flexibility available to founder-led companies, and created new liquidity pathways that did not exist twelve months ago. The AIM market itself is actively competing for international issuers through the new Express Market route, Aimia Inc., listed in Toronto and on the Johannesburg Stock Exchange, commenced trading on AIM in September as one of the early beneficiaries. 

However, regulatory reform is a necessary condition, not a sufficient one. The companies that will benefit most are those whose advisers understand not just the capital markets rules but the ownership structures, the family dynamics, the trust arrangements, and the tax implications that sit behind them. That is the gap in the market which makes the current period a particularly interesting period to be practicing in. 

Next week, I will turn to the question that every founder and family board asks when they first contemplate going public: how do you open the company to the market without losing what made it worth building in the first place?