UK defense stocks rise on spending boost as borrowing pressure clouds outlook

UK defense stocks rise on spending boost as borrowing pressure clouds outlook
UK defense shares rally

Fresh UK defense spending plans are pushing aerospace and military shares higher, extending a sector rally that has been driven by stronger European and NATO outlays over recent years. The latest package adds £15 billion over four years, but investors are also weighing whether fiscal strains and higher borrowing costs could limit how far the gains run.

Highlights

  • UK announces an extra £15 billion in defense spending over four years, raising annual spending to £79.1 billion by 2029 or 2.7% of GDP.
  • FTSE 350 Aerospace & Defense index rises almost 5% since Tuesday, with Babcock, BAE Systems, and Chemring outperforming on expectations of benefiting from new contracts.
  • UK gilt yields rise across all maturities as investors doubt government assurances on funding, with S&P Global Ratings flagging rising fiscal strains from higher defense outlays.

Defense plan lifts sector expectations

As reported by CNBC, outgoing Prime Minister Keir Starmer this week announces an extra £15 billion in defense spending over the next four years under the UK’s Defence Investment Plan, lifting annual spending to £79.1 billion by 2029, or 2.7% of GDP.

The plan is intended to strengthen the UK’s military capability, nuclear deterrent and industrial capacity, while also supporting greater investment in cybersecurity, drones and AI. The latest increase in planned spending lifts the FTSE 350 Aerospace & Defense index by almost 5% since Tuesday’s market open in London, with Babcock, BAE Systems and Chemring among the stronger performers.

The move offers a fresh tailwind for a sector whose multi-year rally had recently begun to lose momentum amid concerns that European defense spending plans could weaken. BAE Systems Chief Executive Charles Woodburn welcomes the announcement, saying it provides clarity for industry and a clear strategic direction for the armed forces.

AJ Bell head of markets Dan Coatsworth says the key question is how long the latest rally lasts, noting that investors had grown tired of repeated promises of higher defense budgets. He says many stocks already price in a stronger earnings pipeline, with valuations looking stretched in parts of the sector, and adds that investors are still waiting for more detail on which companies ultimately benefit from the additional government outlay.

Fiscal strains weigh on market reaction

UK defense shares have posted strong gains over the past five years as military budgets rise. The FTSE 350 Aerospace & Defense index is up about 540% over that period, compared with a 120% return for the Dow Jones U.S. Select Aerospace & Defense Index, reflecting a sharp increase in defense spending across Europe and among NATO allies.

Saxo UK Investor Strategist Neil Wilson identifies BAE Systems as a likely beneficiary because the plan includes £8.6 billion over four years for Tempest, the sixth-generation fighter jet programme for which BAE Systems is responsible for overall aircraft design and flight systems. He also says Chemring, which specialises in sensors, electronic warfare and counter-drone technology, stands to emerge in a stronger position.

At the same time, Wilson warns that debt markets are likely to punish additional borrowing, especially after Starmer rules out war bonds. S&P Global Ratings also highlights that higher defense spending could exacerbate existing fiscal strains and pressure sovereign ratings, and says the UK is among the countries whose defense ambitions are constrained by elevated public debt.

The pressure is already visible in government debt markets. The UK, which faces higher borrowing costs than its G7 peers, sees gilt yields move higher across all maturities on Wednesday despite assurances that the extra defense spending will be funded through cuts in other departments.

Our earlier coverage of the UK’s Defence Investment Plan focused on the political and practical gaps behind the headline rearmament push. We noted that disputes over funding versus reform and persistent procurement constraints can leave capability improvements lagging the spending targets, while also creating added pressure on already-stretched public finances.

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