The FTSE 250 Hit A Record Because Its Companies Are Being Bought

The FTSE 250 has spent August making headlines for the right-sounding reason and the wrong actual one. On 12 August 2026 the mid-cap index touched an intraday high of 24,966.77, finally clearing the peak it set in 2021. It closed at 24,718.82 on Friday 21 August, up 210.16 points on the day. After four years of being the index nobody wanted, mid-cap Britain is at a record.

Here is my claim, and I do not think it is a small one: this record is not a recovery signal. It is a supply signal. The FTSE 250 is rising in large part because its constituents are being removed from it — bought by private equity and trade acquirers, or shrunk by buybacks — while almost nothing arrives to replace them. The index is going up because the market is getting smaller. Those are not the same thing, and confusing them will cost UK investors more than a bad quarter.

An index level is a price, not a verdict

The FTSE 250 is usually treated as a proxy for the domestic British economy, in a way the internationally-earning FTSE 100 is not. On that reading, a record high says something cheerful about UK growth. But an index level is just the price at which the marginal buyer and the marginal seller cleared. It tells you who was buying, not why everyone else should feel good.

In 2026 the marginal buyer of British mid-caps has increasingly not been a fund manager. It has been someone bidding for the whole company. Peel Hunt calculated in July 2026 that announced takeover bids for London-listed companies had reached roughly £60bn for the year, against £2.2bn of combined market value from new arrivals on the exchange — a ratio of about 27 to 1. There were seven listings in the first half of 2026, raising £577.2m between them.

Set that against the outflow. Calastone's data show UK investors pulled a net £1.61bn from equity funds in July 2026 alone, £948m of it from UK-focused funds, taking the twelve-month run rate to a record £13.9bn. Since June 2020, £52.6bn has left UK-focused equity funds, with only four individual months of net inflow in that whole span. July 2026 was the fifth-worst month on Calastone's eleven-year record.

The numbers that do not fit the recovery story

If a record high in the domestic index reflected a domestic upturn, you would expect the rest of the UK data to be pulling in roughly the same direction. It is not.

• Headline CPI rose to 2.9% year-on-year in July 2026, up from 2.6% in June, reported by the ONS on 19 August. Core CPI held at 2.6%, a touch above the 2.5% consensus. Gas prices recorded their sharpest rise since 2022 after the energy price cap went up 13% at the start of July.
• Retail sales volumes fell 0.5% in July 2026, the first monthly decline since April, with non-food volumes down 1.3% and clothing down 2.7% month on month. Online retail sales values fell 3.9% against June.
• The 10-year gilt yield sat at around 5.05% after the inflation release, with traders still assigning real probability to a Bank of England rate rise before year end rather than a cut.

So: a squeezed consumer, an inflation rate moving the wrong way on energy, and a borrowing cost near five percent. That is not the macro backdrop that normally produces a record in the index most exposed to it. Something other than domestic optimism is doing the work.

What is actually doing the work

The biggest deals this summer make the mechanism visible even though they sit in the FTSE 100 rather than the 250. On 27 July 2026 DCC Energy agreed a £5.75bn takeover by KKR and Energy Capital Partners at £65.25 a share in cash — a 36% premium to its twelve-month volume-weighted average price to 28 April 2026. On 6 August 2026 easyJet's board accepted £7.15 a share in cash from Apollo Global Management, valuing it at about £5.7bn, after Castlelake withdrew with a final proposal of £6.90.

Neither of those is a FTSE 250 company, and I am not going to pretend otherwise. But they establish the price at which the whole of listed Britain is being marked, and the same buyers work their way steadily down the market-cap scale, where the FTSE 250 lives and where the deal sizes are small enough for far more bidders to participate. Foreign-led offers for UK targets have passed $197bn year to date, the highest since records began in 1980, with total offers above $231bn, up 210% on the prior year.

The structural evidence is starker still. London's primary listings have fallen from more than 1,400 in December 2010 to 913 by March 2026. The exchange has recorded more delistings than new listings every year since 2022. Take-privates accounted for roughly 20% of realised UK private equity deal value in the first half of 2026.

When a bid lands at a 30% or 40% premium, the target reprices instantly, its peers reprice in sympathy, and the index rises. Then the company leaves. The index keeps the gain and loses the constituent. Repeat that thirty times and you have a chart that looks like a bull market and a market that is one-tenth smaller.

The bull case, stated fairly

The strongest argument against me runs like this: the bids are not a symptom of decline, they are the mechanism of the re-rating. Sophisticated buyers with their own capital have concluded UK mid-caps are mispriced. Prices rise to reflect that. Domestic investors, seeing the premiums being paid, eventually stop selling and start buying. The M&A wave is the spark; the flows follow.

That is a serious argument and it is half right. The bids genuinely are information — you cannot pay a 36% premium in cash thirty times over and claim the market was correctly valued. Where I part company is on the second half. The flows have not followed. They have kept going the other way, at an accelerating rate, through the very months the index was setting records. A re-rating that the domestic investor base declines to participate in is not a re-rating. It is a handover.

Why being paid a premium is not the same as winning

This is the part that gets missed, and it is the reason I think the record high is bad news rather than good. A takeover premium feels like a victory on the day of the announcement. Over a decade it is frequently a wealth transfer.

Consider what a UK mid-cap fund actually experiences. Its holding is bid for at a 35% premium to a price that was itself depressed by four years of forced selling. It receives cash. It then has to redeploy that cash into a shrinking opportunity set — 913 primary listings and falling — or hand it back to unitholders who are already redeeming. The premium is measured against the wrong benchmark. The right benchmark is what that business would have been worth to a patient public shareholder over ten years, and on that measure a third above a distressed price is not obviously generous.

Meanwhile the buyer takes the asset, the operating leverage, and any subsequent re-rating entirely private. The public market gets a one-off cheque and a smaller future. That is why I read 24,966.77 as a symptom rather than a milestone.

What would break the bid wave

The uncomfortable corollary of my argument is that it is testable in a fairly brutal way: if the index is being levitated by deal flow, it stalls when deal flow stalls. Two things stop it. Sterling strength, which raises the dollar cost of British assets for the American funds doing most of the buying. And the cost of leverage — with 10-year gilts near 5.05% and credit spreads tied to the same global bond pressure that unsettled markets this week, the arithmetic on a leveraged take-private gets harder every basis point.

If both move against acquirers in the autumn, we will find out very quickly how much of this record was fundamental and how much was flow. My expectation is that the answer is unflattering.

What would change my mind

I would abandon this view on clear evidence, and I want to be specific about what that evidence is.

First, flows. If Calastone and the broader flow data show UK-focused equity funds turning net positive and staying there for two consecutive quarters, then the domestic buyer has returned and my central claim collapses. One good month is noise; six is a trend.

Second, issuance. If new listings begin to replace what is being removed — proceeds running in the billions per half rather than £577.2m — then the shrinkage stops and the index level starts to mean what people think it means again.

Third, breadth without bids. If the FTSE 250 advances meaningfully in a quarter with no significant takeover announcements, the rally has a source other than the one I have described, and I should say so.

Until at least two of those three are true, I will read every new record in the mid-cap index the same way: as the price Britain is charging to be taken off the market, quoted in points rather than pounds.