June 2026 marked ten years since the UK voted to leave the European Union. The anniversary passed quietly compared to the chaos of the vote itself, but the numbers that have emerged tell a story that anyone holding UK investments needs to pay attention to.
Roughly $160 billion has flowed out of UK equity funds since the referendum, according to Morningstar’s “The Brexit Decade” analysis. That’s not a blip. It represents a structural change in how global capital views British markets. Let’s take a closer look at what a decade of hard data actually reveals.
Where the Money Went
The headline figures make for uncomfortable reading in London. The FTSE 100 has gained around 62% since the referendum, which works out to a compounded annual growth rate of just under 5%. On its own, that doesn’t sound terrible. But it pales next to the S&P 500’s 253% gain over the same period, an annualised return of roughly 13.4%.
The gap isn’t only transatlantic. Within Europe, the German DAX returned 151% and the Euro STOXX 50 gained 109%. Continental markets, which many expected to suffer alongside Britain during the divorce, have comfortably outpaced London.
And then there’s the currency story. On the eve of the referendum, one pound bought €1.31. Today, it buys roughly €1.15. That 12% loss of purchasing power against the euro hits particularly hard for British investors with European expenses or property, and for the expat community that moves money between the two currencies regularly.
Why UK Stocks Fell Out of Favour
Morningstar’s research makes an important distinction. Brexit didn’t cause the UK market’s problems from scratch. It accelerated trends that were already in motion.
Before 2016, UK equities were already losing ground. Domestic pension funds had been reducing their British holdings for years. The London market was heavy on banks, oil companies and miners, and light on the technology stocks that drove global returns through the 2010s. Brexit arrived at a moment of existing weakness and made everything worse.
The change in investor behaviour has been dramatic. In the most equity-heavy category of sterling-denominated funds, UK allocations have dropped from 40% to just 18%. That freed-up capital went overwhelmingly into US stocks. The UK’s weight in the MSCI All Country World Index has roughly halved over the past two decades, falling from nearly 10% to around 4%. For a market that once punched well above its weight in global portfolios, the decline has been steep.
On the industry side, around 380 UK equity fund strategies have closed since 2016, against just over 200 launches. Active managers like Columbia Threadneedle, Jupiter and Liontrust have taken the heaviest outflows, while passive providers like Vanguard and iShares have captured most of the remaining demand.
A Quiet Turnaround Since 2022
The story has taken a turn in recent years. Since 2022, UK equities have actually outperformed US and global markets, according to Morningstar. The reasons are unglamorous but solid: exposure to value sectors like energy and financials, steady dividend income, and the fact that higher interest rates have made the qualities London excels at (cash generation, yield, low valuations) more attractive than they were during the growth-stock era.
The FTSE 100 still trades at a 30% to 35% price-to-earnings discount compared to US equities. Record levels of mergers and acquisitions activity and share buybacks suggest that corporate insiders and foreign buyers can see value where public fund managers have remained cautious.
How UK Holdings Fit Into a Broader Portfolio
For investors who still hold British stocks, one of the key questions coming out of the Brexit decade is whether their UK allocations still make sense alongside the rest of their portfolio. A concentrated position in a market that has underperformed for a decade can quietly unbalance a portfolio’s risk profile, even if the underlying companies remain sound.
Many UK investors have already moved capital into global indices, and a growing number have increased their European exposure. In 2025, inflows into European equity funds reversed years of outflows, with investors drawn by cheaper valuations and diversification away from a US market that looked increasingly expensive. That trend has continued into 2026.
Coordination between investments and broader financial decisions, the kind of work that UK financial planning experts handle day to day, will be especially relevant for anyone whose portfolio was built before 2016 and hasn’t been reviewed since. The discount on UK stocks may well turn out to be an opportunity, but only if it’s part of a plan that accounts for where the rest of an investor’s money is going.
What the Discount Means Now
The big debate among analysts is whether UK equities represent a value trap or a genuine bargain. Morningstar’s own view is cautiously positive. The pessimism embedded in current valuations may have overshot, and several countries written off during the eurozone crisis of the 2010s, including Greece, Spain and Ireland, have since outperformed the global benchmark over five years.
Others are more measured. JP Morgan’s Mislav Matejka has argued that British stocks tend to do well when investors turn bearish on everything else, given the FTSE 100’s defensive profile. He expects the UK index to gain 5% to 10% in 2026 but doesn’t hold an overweight position, on the basis that the UK lacks a clear growth catalyst comparable to those appearing in Germany or China.
The honest answer is that nobody knows yet. What the data does show is that the UK market has spent a decade getting cheaper relative to nearly every comparable market, and that the reasons for the discount are well understood. Whether those reasons have been priced in too aggressively is the question that will define UK equity returns over the next several years.
Ten Years of Data, No Simple Answers
A decade is long enough to separate noise from signal. The signal from the Brexit decade is clear: capital left the UK in enormous volumes, the market fell behind its peers, and sterling lost ground against most major currencies. But the more recent data complicates the picture. UK stocks have outperformed since 2022, valuations look cheap by almost any historical standard, and corporate activity suggests confidence that public markets haven’t yet reflected.
For anyone with UK holdings, whether held directly or through a pension, the practical question is what to do about it. Ignoring it isn’t a strategy, but neither is selling at the bottom of a decade-long sentiment cycle. The tenth anniversary of the Brexit vote is a useful prompt to look at the numbers clearly and make decisions based on what the data says, not on how the headlines feel.
The value of your investments and the income from them may go down as well as up, and you could get back less than you invested. Past performance should not be seen as an indication of future performance.
