Entain's FTSE 100 Exit Is Confirmed, and the Selling Starts on 18 September

FTSE Russell published the September review on 2 September and the indicative screen held. The Ladbrokes owner leaves the index it joined in June 2020, and tracker funds have a fixed date to sell.

• FTSE Russell confirmed on 2 September that Entain and Persimmon leave the FTSE 100 and enter the FTSE 250, with easyJet and Ithaca Energy promoted in their place
• The changes are implemented at the close of business on Friday 18 September and take effect from the start of trading on Monday 21 September
• The outcome matches the indicative screening we reported on 27 August, so the only new information is that it is now certain and dated
• Entain shares have weakened by around 30% since the start of the year despite a first-half performance that beat expectations, and the group has said it faces roughly £250 million from new UK gambling taxes
• The company joined the FTSE 100 in June 2020, so the demotion closes a six-year run on the London Stock Exchange's premium index

The Review Is Rules-Driven, and the Date Is the Point

FTSE Russell published the results of the September quarterly review of the FTSE UK Index Series on 2 September. Entain and Persimmon are deleted from the FTSE 100 and added to the FTSE 250. easyJet and Ithaca Energy move the other way. The FTSE 250 also adds Seraphim Space Investment Trust and loses Aston Martin Lagonda Global Holdings, GB Group and Volex alongside the two promotions.

The index provider describes these as the product of rules-driven, impartial quarterly reviews intended to keep the indexes representative. There is no editorial judgement in it, and no assessment of Entain's trading. A company falls out of the FTSE 100 when its market capitalisation drops below the threshold that protects an incumbent constituent, and Entain's has.

What the confirmation adds to what was already known is precision on timing. Implementation occurs at the close of business on Friday 18 September, with the changes effective from the start of trading on Monday 21 September. Funds benchmarked to the FTSE 100 must be out by that close, which concentrates mechanical selling into a known window rather than spreading it.

The backdrop is a share price down roughly 30% since the start of the year, which happened despite a first-half performance that beat expectations, and a stated exposure of about £250 million to new UK gambling taxes. Entain has spent the year restructuring, including a phased exit from central and eastern Europe.

A Dated, Forced Seller Is Information Other People Trade On

Index demotion is the rare corporate event where the size and deadline of the selling are public in advance. Every passive fund tracking the FTSE 100 must be out of Entain by the close on 18 September, and everybody else knows it. That asymmetry usually shows up as weakness into the rebalance and a partial recovery afterwards, as the forced flow clears and FTSE 250 trackers buy on the other side. None of it says anything about the business, which is exactly why the period between now and the 21st is a poor guide to how the market values Entain. The number worth watching is where the price settles in October, once the mechanical flow is finished and the only people holding are those who chose to.

The Demotion Is a Symptom of the Tax, Not of the Trading

The uncomfortable part for the sector is the sequence. Entain beat expectations in the first half and its shares still fell by about 30%, because the market is pricing a roughly £250 million annual tax burden and the doubling of Remote Gaming Duty from 21% to 40% that arrives in April. A company can be operationally sound and still lose a third of its value when the state reprices its economics, and index membership follows value rather than performance. This is the second British gambling story in a fortnight to turn on the same fiscal decision, after the betting shop closures that have run through the retail estate all year. The Treasury's revenue case for the duty rise assumes the taxed activity stays where it is. The market is quietly pricing something else.

Entain's exit was mechanical, forecast and now dated. What it measures is not the company's year but the cost of the policy environment it operates in.