Graduation to Main Market Offers No Guarantee of Gains for Smaller Companies

Shore Capital has cautioned that a move from AIM to the Main Market provides no automatic share price uplift for smaller companies, as recent performance data reveals a more nuanced picture of the benefits typically associated with graduating to London’s premier exchange.

The broker’s latest monthly markets note for April 2026 highlights that UK equities, particularly smaller capitalisation stocks, remain significantly undervalued relative to global peers. This valuation gap persists despite ongoing macroeconomic uncertainties stemming from Middle East conflict that continue to cloud the near-term outlook for both growth and inflation.

AIM delivered the strongest performance among UK indices during April, advancing 10.7 per cent and outpacing both the FTSE Small Cap and FTSE 250. All UK indices have maintained double-digit positive returns over the trailing 12-month period, with the FTSE 100 climbing 22.2 per cent and AIM rising 15 per cent.

The broker’s analysis examined 13 companies that have transitioned from AIM to the Main Market since January 2025. The findings revealed that share prices declined an average of 5.2 per cent during the period between announcement of the intended move and the first day of trading on the new market. This initial underperformance is likely attributable to selling by inheritance tax-focused funds following the news.

From the effective date of the market change through to the end of April, however, average performance turned positive at 2.1 per cent. Shore Capital concluded that the quality of the underlying business matters considerably more than the choice of listing venue.

On the macroeconomic front, Shore Capital sees greater downside than upside risk to UK growth in 2026. The ongoing Middle East conflict compounds existing headwinds from two consecutive budgets that have weighed on business confidence, alongside the persistent drag from tariffs implemented by the Trump administration on global trade flows.

The broker expects interest rates to remain on hold at 3.75 per cent in the near term. The Bank of England’s Monetary Policy Committee voted 8-1 to maintain the current rate at its April meeting, with one member advocating for an increase. Shore Capital believes rate cuts are more probable than further rises once the trajectory of oil prices becomes clearer.

Mergers and acquisitions activity remains robust, with the broker counting 10 new transactions in April alone. Bid premiums ranged from 8 per cent to 157 per cent during the month. Targets included Intertek, Treatt, Deltic Energy and AnimalCare. Shore Capital views this sustained deal flow as the clearest evidence that UK companies remain cheap by historical and international standards.

The broker characterises UK smaller companies as unloved, undervalued and under-owned, with ongoing corporate activity continuing to underscore the persistent valuation gap.

Gilt yields peaked at approximately 5.1 per cent in April before easing moderately. Shore Capital anticipates yields will drift lower in the months ahead, a development it regards as a potential tailwind for equity markets.