The FTSE 100 kept doing what it's done for most of 2026 this week: holding up near record levels while a specific sector, not the index broadly, did most of the actual moving. The blue-chip benchmark closed the trading week ended July 17 at 10,600.37, recovering from a mid-week dip tied to domestic GDP data and Middle East tensions, with defensive stocks and energy names providing the ballast. Then a political appointment gave defence stocks — already one of 2026's best-performing FTSE sectors — a fresh, specific catalyst.
The short version: FTSE 100 closed the week ended July 17 at 10,600.37, up from a mid-week dip tied to GDP data and Middle East tensions. This week's catalyst: John Healey's appointment as Chancellor of the Exchequer, read as reinforcing UK defence-spending commitments. BAE Systems +2.5%, Rolls-Royce +1.8%, Babcock +6%, with Chemring and QinetiQ also higher — extending a defence-sector rally that's been one of the FTSE's strongest 2026 themes.
A Chancellor appointment moved defence stocks more than economic data did
The specific trigger for this week's defence-stock rally was political rather than economic: John Healey's appointment as Chancellor of the Exchequer, after he quit as defence minister last month over a disagreement about military spending. Investors read the appointment as reinforcing the government's commitment to continued defence spending increases, and defence names rallied accordingly — BAE Systems rose 2.5%, Rolls-Royce gained 1.8%, and Babcock jumped 6%, with smaller defence names Chemring and QinetiQ also higher. It's a reminder that for a sector this policy-sensitive, a cabinet appointment can move share prices more in a single session than a full week of economic data releases.
The broader index: defensives and energy did the heavy lifting
Away from defence specifically, the FTSE 100's climb to 10,600.37 for the week ended July 17 leaned on a familiar 2026 pattern: defensive stocks and energy names holding the index up through a mid-week wobble tied to domestic GDP data and the same Middle East tensions affecting global oil prices. That pattern — old-economy sectors like banks, energy majors, and defence carrying the index rather than tech — has defined the FTSE's 2026 story more broadly, and continued into this week's defence-led gains.
Has the defence rally run too far?
It's a fair question after a year like this one. BAE Systems and Rolls-Royce have been among the FTSE 100's best performers of 2026, riding a genuine increase in UK government defence-spending commitments (Prime Minister Keir Starmer has committed to spending 3% of national income on defence during the next parliament, by 2034) layered on top of rising global tensions. Both stocks now trade well above the wider index's average valuation, which some analysts read as a sign the easiest re-rating — from a previously undervalued starting point — has largely already happened, even if the underlying spending story continues to support the sector.
| Stock | This week's move |
|---|---|
| BAE Systems | +2.5% |
| Rolls-Royce | +1.8% |
| Babcock | +6% |
| FTSE 100 (week ended Jul 17) | 10,600.37 |
What this means if you're investing through it
- Political appointments can move specific sectors sharply — a Chancellor's background in defence policy was enough to lift an entire sub-sector in a single session, independent of any broader economic news.
- A rising index doesn't mean broad-based strength — the FTSE's 2026 gains have concentrated in old-economy sectors like defence, energy, and banks, a different composition from the AI-driven rallies seen in the US and Japan.
- Valuation matters even in a strong sector — defence stocks trading above the index average after a big run is worth knowing before assuming the same pace of gains continues from here.