Key Takeaways
- Asset manager Aberdeen has rejoined the FTSE 100 index alongside tech stock Computacenter and wealth manager Investec.
- Berkeley Group, Rightmove and Mondi have dropped out of the benchmark index.
- The reshuffle also sees significant investment trust movement, with Seraphim Space rising to the FTSE 250 for the first time.
Asset manager Aberdeen ABDN has reentered the FTSE 100 after almost three years away from the top-flight index. The latest quarterly changes to the UK index were confirmed by index owner FTSE Russell after the market close on June 3 and will come into effect on June 22.
The promotion for the Scottish fund manager comes almost two years after Jason Windsor took over as CEO and a year after the firm rebranded from Abrdn.
Aberdeen’s recent growth has been driven by platform business Interactive Investor, which Aberdeen bought for £1.5 billion in 2022. The purchase allowed the asset manager to diversify its business, which is now made up of the platform, advisor and asset management divisions.
Interactive Investor reported record net inflows of £3 billion in the first quarter of 2026, while customers grew 14%.
Aberdeen dropped out of the FTSE 100 in September 2023, having previously returned to the index in 2022. The asset manager has nine funds with a Morningstar Medalist Rating of Gold.
Aberdeen will be joined in the FTSE 100 by wealth manager Investec INVP. The promotion ends a 15-year stint in the FTSE 250 following its relegation from the FTSE 100 in 2011. Investec shares are up 12.3% since the start of 2026.
Meanwhile, the housing sector slump has taken its toll on share prices in the sector, with housebuilder Berkeley Group BKG and property portal Rightmove RMV both set for relegation from the FTSE 100.
Berkeley Group shares have fallen 13.6% so far this year amid a wider selloff in the sector since the outbreak of the Iran war. Housebuilders sold off on fears of the war’s impact on UK inflation, mortgage rates, affordability, and consumer confidence.
Packaging group Mondi MNDI will also drop out of the index after its shares fell by a fifth so far in 2026.
The FTSE 100 Gets a Tech Stock Boost
IT infrastructure stock Computacenter’s CCC promotion into the index gives the FTSE 100 further exposure to the global AI supply chain.
Computacenter builds and manages IT hardware for clients at scale, which has allowed the company to benefit from the buildout of data centers, particularly in the US.
AI demand has sent the company’s shares surging to all-time highs, rising over 55% in the last six months.
UK Investment Trusts Leaving and Joining the FTSE 250
As markets gear up for the mega-IPO of SpaceX in the US, UK-listed investment trust Seraphim Space SSIT has been capitalizing on the excitement surrounding space technology.
Seraphim Space, which floated in 2021, invests in early and growth-stage businesses linked to space technology.
Despite not having direct exposure to SpaceX, a share price rise of over 160% in the last 12 months has seen the investment trust enter the FTSE 250 for the first time.
Meanwhile, investment trusts Impax Environmental Markets IEM, Chrysalis Investments CHRY and JPMorgan India Growth and Income JIGI are set to drop out of the mid-cap index after a challenging period of performance.
The Impax trust leaves the FTSE 250 after its battle with activist hedge fund Saba Capital Management, which ended in the board proposing an exit tender offer to shareholders in April.
Chrysalis investors have voted to wind down the investment trust, which held unlisted fintech stocks like Starling bank, with assets being sold off over a three-year period.
Why the FTSE 100 Reshuffle Matters
These index changes offer an insight into which sectors are in and out of favor, and which companies are on the up or struggling in the big league. It’s purely down to changes in market value.
Index provider FTSE Russell changes the constituents of its indexes every quarter to reflect the valuations of Britain’s biggest companies. Which companies move in and out of the FTSE 100 is based on their total market capitalization at the end of the specified trading day.
To avoid the same borderline companies dropping out and back in every reshuffle, a company must be in the top 90 by market cap to be promoted. Likewise, to be demoted, the firm has to be below the 110th biggest company by size.
Index changes also matter from an ETF and index fund flow point of view: FTSE 100, 250 and All Share trackers have to adjust to changes whenever they’re made.
Asset managers also have to buy and sell stocks to make sure they match the benchmark. And as the FTSE 100 is generally more liquid than other indexes, inclusion in an index tends to boost flows into a particular stock. As more money moves into passive funds, index changes become more significant over time.
