FTSE reshuffle points to UK leadership shift toward energy and travel

FTSE Russell’s September quarterly review is shaping up as a sector signal as much as an index event. Indicative screens point to easyJet and Ithaca Energy moving into the FTSE 100, while Entain and Persimmon are at risk of relegation after the index provider uses closing prices from 1 September and confirms changes after the close on 2 September.²

If confirmed, the reshuffle would tilt the UK blue-chip benchmark further toward travel and energy, while removing two companies more exposed to domestic consumer, regulatory and housing-cycle pressures. For passive investors, the decision matters because index-tracking funds typically have to buy promoted stocks and sell demoted names around implementation later in the month.¹

What the screens are showing

Market trackers cited ahead of the review expect easyJet to return to the FTSE 100 alongside North Sea producer Ithaca Energy.² The likely exits are Entain, owner of Ladbrokes and Coral, and housebuilder Persimmon, both of which have slipped toward the bottom of the blue-chip ranking by market capitalisation.³

The possible changes are not yet official. FTSE Russell’s methodology makes the 1 September close the decisive data point for the September review, with final announcements expected after the 2 September close.² That leaves a short window for investors to position around what is usually a rules-based but still market-moving event.

Aston Martin is also under pressure in the broader FTSE review process, with reports suggesting the carmaker faces possible FTSE 250 relegation rather than a FTSE 100 move.³ But for large-cap UK equity exposure, the more important signal is the likely swap of easyJet and Ithaca for Entain and Persimmon.

Why easyJet and Ithaca matter

easyJet’s expected promotion reflects the recovery in European travel demand and the airline’s improved market value after years of pandemic disruption, cost inflation and balance-sheet strain.¹ A return to the FTSE 100 would mark a symbolic rehabilitation for the carrier and increase the benchmark’s sensitivity to leisure travel, aviation costs and household spending on holidays.

Ithaca’s potential entry points in a different direction: energy. The company’s North Sea exposure would add another commodity-linked constituent to an index already heavily shaped by oil, gas, mining and global financials.² Reports ahead of the review have linked Ithaca’s rise to support from firmer energy prices and investor demand for cash-generative resource assets.³

Together, easyJet and Ithaca would make the FTSE 100 marginally more cyclical, but in different ways. Travel is tied to discretionary spending and capacity discipline; energy is tied to commodity prices, fiscal regimes and capital returns. Both have had stronger market momentum than the companies they may replace.

Why Entain and Persimmon are vulnerable

Entain’s expected relegation follows a difficult period for gambling shares. Reports have tied its market-cap decline to regulatory and tax pressure, including investor concern over possible higher gambling duties in the UK.⁴ European Gaming also noted Entain’s weekly share-price underperformance in late August and linked it directly to FTSE Russell relegation risk.⁷

The pressure on Persimmon is more macroeconomic. The housebuilder has been hit by weak housing demand, affordability constraints and higher financing costs. Skyline Wire reported that Persimmon faced FTSE 250 relegation after a steep share-price fall, highlighting the strain on the UK housing sector.⁹

That pairing is notable. Entain represents a domestically sensitive, politically exposed consumer sector; Persimmon represents the UK housing cycle. Their possible removal would reduce the FTSE 100’s exposure to two areas where investors have been reluctant to pay large-cap multiples in 2026.

Passive flows are the mechanical part

The index decision itself is binary, but the trading around it is not. Inclusion in the FTSE 100 can trigger buying from funds that replicate or benchmark against the index, while relegation can create forced selling by the same pool of investors.¹

That does not make the reshuffle a surprise. Index demotions are among the more visible market events because the inputs are largely observable: market capitalisation, ranking thresholds and review dates. iPredicta described FTSE 100 relegation as a highly priceable event because the outcome is rule-driven and resolved by an index provider.⁵

The practical question for investors is therefore not only whether easyJet, Ithaca, Entain and Persimmon move, but how much of that outcome is already reflected in prices. Stocks often move ahead of index confirmation, then see additional volume around the effective date as passive funds complete their rebalances.

The bigger message for UK equities

The expected reshuffle is a snapshot of where UK large-cap leadership has moved in 2026. Travel and energy have regained index relevance; gambling and housebuilding have lost it. That is not a full verdict on the companies’ long-term prospects, but it is a clear statement about relative market capitalisation at this point in the cycle.

For UK equity readers, the review is worth watching for three reasons. First, it affects near-term flows in the stocks concerned. Second, it changes the FTSE 100’s sector mix at the margin. Third, it underlines the market’s preference for companies with global, commodity or reopening-linked earnings over those facing domestic policy and housing headwinds.

The final list will come after the 2 September close. If the indicative screens are right, the FTSE 100’s next version will look slightly less like a proxy for UK housing and gambling, and slightly more like a benchmark for travel demand and energy cash flows.

FTSE reshuffle points to UK leadership shift toward energy and travel

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Source Material

What the screens are showing

Why easyJet and Ithaca matter

Why Entain and Persimmon are vulnerable

Passive flows are the mechanical part

The bigger message for UK equities

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