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FTSE 100: the UK flagship index post-Brexit

The FTSE 100 ("Footsie") groups the 100 largest caps of the London Stock Exchange. AstraZeneca, Shell, HSBC, Unilever, BP dominate. Value-heavy and internationally-exposed index (~70 % of revenue outside UK), correlated to oil and commodities.

Why the FTSE 100 isn't really "British"

The FTSE 100 has a unique characteristic among major indices: its companies are listed in London, but they generate revenue worldwide. About 70-75 % of total revenue of FTSE 100 companies comes from abroad. That's why the FTSE is often nicknamed "the global index listed in London".

FTSE 100 top 10 in April 2026 (approximate weights):

  1. AstraZeneca (AZN) — ~9 % — global pharma (oncology, cardio)
  2. Shell (SHEL) — ~8 % — oil and gas, integrated global
  3. HSBC Holdings (HSBA) — ~6 % — Asia-Europe commercial banking
  4. Unilever (ULVR) — ~5 % — consumer goods (Dove, Hellmann's, Magnum)
  5. GSK (GSK) — ~4 % — pharma + vaccines
  6. BP (BP.) — ~3.5 % — oil and gas, energy transition
  7. Diageo (DGE) — ~3 % — beverages (Johnnie Walker, Guinness, Smirnoff)
  8. British American Tobacco (BATS) — ~3 % — global tobacco
  9. Rio Tinto (RIO) — ~3 % — mining (iron, copper, lithium)
  10. National Grid (NG.) — ~2.5 % — electricity distribution UK + USA

Heavily-represented sectors: energy/oil (~12 %), financial (~16 %), consumer staples (~14 %), pharma (~13 %), mining (~5 %). Typically a "value" and "old economy" index — little tech (vs Nasdaq 100), lots of dividends (average yield ~3.5-4 %/year).

Post-Brexit performance: the 2024-2026 catch-up

Between 2016 (Brexit vote) and 2024, the FTSE 100 strongly underperformed other major indices. The S&P 500 gained ~150 % over this period, DAX ~70 %, CAC 40 ~80 %, but FTSE only ~30 %. Several reasons:

  1. Lack of tech — US tech mega-caps drove global performance 2018-2024. FTSE has barely any tech (just ARM before its delisting, and a few fintechs).
  1. Brexit uncertainty — between 2016 and 2020, trade uncertainty penalized UK valuations (forward P/E 12 vs 18 for S&P 500).
  1. Loss of EU financial passports — the City lost its European financial hub role to Paris, Frankfurt, Amsterdam (Euronext even surpassed LSE in market cap in 2020-2022).

Since late 2023, the narrative changed. The FTSE 100 rebounded significantly, hitting 9,000 points for the first time in March 2025. Rebound drivers:

  • Attractive dividends (~4 %/year average) in an environment where US rate cuts make "old economy" values attractive again
  • Pound weakness — when GBP falls, exporting UK companies (Unilever, AstraZeneca) mechanically benefit
  • Value/growth rotation — after 7 years of growth dominance, some managers rotated to value
  • Foreign M&A — several UK companies acquired at premium by US firms (Anglo American, ARM before its partial buyout)

20-year performance dividends included: ~6.5 %/year. Less than S&P 500 (~11 %) but more stable, with volatility of only ~14 %/year (vs 18 % for DAX).

How to invest in the FTSE 100 from France

Bad news: since Brexit, the FTSE 100 is no longer PEA-eligible (the PEA requires shares from the European Economic Area, and the UK exited in 2020). To invest in FTSE from France, you must go through a regular brokerage account (CTO) or life insurance with UC units.

Main options:

  1. FTSE 100 UCITS ETF — iShares Core FTSE 100 (ISF, CUKX) or Vanguard FTSE 100 (VUKE). Fees 0.07-0.09 %/year, among the cheapest market ETFs. Listed in London in GBP.
  1. FTSE 100 EUR ETF — most UCITS ETFs offer EUR share classes (VUKE EUR, ISF EUR) to avoid multi-currency accounts. Not real hedging, just automatic conversion.
  1. FTSE 100 EUR hedged ETF — iShares FTSE 100 EUR Hedged (EFTH). Neutralizes GBP/EUR risk, fees 0.15 %/year. Relevant if you expect a bearish pound (Brexit pessimist).
  1. Direct purchase of FTSE leaders — Shell, AstraZeneca, Unilever accessible from France via Trade Republic, Interactive Brokers, Saxo. Beware: UK dividends are subject to withholding tax (15-20 %), partially recoverable via form 5000-FR from HMRC. Complex.

French taxation: on regular brokerage, dividends + gains at 30 % flat tax. On life insurance, FTSE UC units qualify and benefit from classic AV advantages (€4,600/year exemption after 8 years).

When to buy? The FTSE 100 tends to shine in 2 environments: (1) global risk-off because its defensive companies and dividends attract funds; (2) strong dollar because the pound automatically depreciates, boosting export revenue. Conversely, in tech-dominated risk-on environments, the FTSE almost always underperforms.

Latest news on FTSE 100: the UK flagship index post-Brexit(15)

TotalEnergies Shares Fall on the Stock Market After Disappointing Q2 Results
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TotalEnergies Shares Fall on the Stock Market After Disappointing Q2 Results

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Rio Tinto Plummets in London Amid Pressure from Chinese Iron Ore
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Rio Tinto Plummets in London Amid Pressure from Chinese Iron Ore

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Babcock Launches a £200 Million Share Buyback

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The FTSE 100 rises despite soaring oil prices amid the Iran deal
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BP expects exceptional first-quarter results thanks to oil volatility
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BP expects exceptional first-quarter results thanks to oil volatility

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European stock markets open lower in the face of Middle East tensions
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European stock markets open lower in the face of Middle East tensions

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Frequently asked questions

FTSE 100 or S&P 500, which to choose?+
Honest answer over 20 years: S&P 500 wins clearly (11 %/year vs 6.5 %/year for FTSE 100). But FTSE is more defensive: less volatile, more dividends (~4 % vs ~1.5 %), less tech exposure. For a retired investor or someone wanting to limit drawdowns, FTSE can be a good compromise. For a young investor targeting growth, S&P 500 remains superior.
Why is FTSE 100 no longer PEA-eligible?+
The PEA requires shares from the European Economic Area (EEA) — EU + Norway + Liechtenstein + Iceland. With Brexit finalized in January 2020, the UK left the EEA. UK companies thus lost PEA eligibility. If you already held UK shares in your PEA before 2020, they stayed (grandfathering), but no new purchase is allowed.
What's the FTSE 100 dividend yield?+
Historically among the highest of major indices: 3.5-4 %/year average, sometimes 5 %+ in some years. Compared: S&P 500 ~1.5 %/year, CAC 40 ~3 %/year, DAX ~3 %/year (but TR so already included in the index). For income-oriented investors, this is the FTSE's main argument.
Will FTSE 100 underperform much longer?+
Hard to predict. The late 2023-2025 rebound shows mean reversion phases exist. Bullish drivers: persistent pound weakness, value rotation, continued foreign M&A. Bearish drivers: no UK tech growth relay (vs USA, India), foreign fund disinvestment, the City emptying out. Without major disruptive UK tech, structural ceiling possible.
Which FTSE 100 ETF to choose?+
For pure performance: iShares Core FTSE 100 (ISF, fees 0.07 %/year, ~£12B AUM, most liquid). For ultra-low fees: Vanguard VUKE (0.09 %/year). To hedge currency risk: iShares FTSE 100 EUR Hedged (EFTH, 0.15 %/year). For a UCITS wrapper compatible with life insurance, any of the three works.