Old‑Economy Tilt: Energy, Banks and Miners in the FTSE 100

Scroll through the FTSE 100’s sector breakdown, and it reads like a roll call of the last economic cycle: banks, oil majors, miners, consumer staples, and defence. In 2026, that old-economy tilt is not just a stereotype — it is what drives the index’s day-to-day behaviour.

Siblis Research’s sector data show that as of the end of 2024, financials held about 23.1% of the FTSE 100, consumer staples 17.8%, healthcare 11.2%, energy 10.8% and materials 7.4%. Technology, by contrast, accounted for just 1.1% of the index, with communications barely 2.8%. A separate FTSE sector breakdown puts energy at roughly 15% and financials at around 18%, naming Shell, BP, HSBC and Barclays among the key drivers of index performance.

This mix means commodity and rate cycles do much of the heavy lifting. A January 2026 piece mapping the “bull case” for the FTSE notes that energy’s 10.75% weighting gives the index outsized sensitivity to oil and gas prices, while industrials—which include defence and aerospace names—stand at about 14.45% and have been major beneficiaries of heightened geopolitical risk. Another analysis from the same month points out that mining, aerospace and finance together powered over 70% of the FTSE 100’s 2025 gains and argues that miners like Glencore and Rio Tinto remain at the centre of the index’s growth story as 2026 begins.

Rate policy feeds into this via bank margins and discount rates. Higher UK and global yields have supported interest income for lenders, while at the same time depressing valuations for long‑duration assets like growth stocks — a trade that naturally favours the FTSE’s value‑tilted, cash‑flow‑heavy sectors. On the commodity side, energy and materials names have gained from renewed volatility in oil and metals linked to Middle East conflict and supply disruptions, again amplifying the link between global macro shocks and FTSE performance.

The result is an index that, in 2026, behaves more like a geared play on global commodities, bank balance sheets and defensive consumer brands than on technology or domestic UK growth. For investors, that makes the FTSE 100 a structurally different exposure from US benchmarks: less about AI and software multiples, more about dividends, balance‑sheet strength and where we are in the commodity and rate cycle.