3 UK Defence Stocks With Long Term Government Revenue In Focus

Simply Wall St · 1d ago

With Westminster now talking about higher defence spending in theory while delaying any firm path to 3% of GDP, UK aerospace and defence stocks suddenly sit in a grey zone where sentiment can swing fast. That uncertainty can create pricing gaps, both for potential winners and for stocks that investors may be overlooking. This article walks through three UK Defence and Aerospace Contractors from the screener that are closely exposed to this policy debate.

The three stocks covered below are just a sample from this theme, and the full screen surfaced 12 more UK Defence and Aerospace Contractors with equally compelling narratives that are not discussed in this article.

If you want to identify and analyze the wider set of UK defence and aerospace contractors that fit these quality filters, head straight to the UK Defence and Aerospace Contractors screener.

Costain Group (LSE:COST)

Costain Group is a UK infrastructure company that designs, builds and manages complex projects across transport, energy, water and defence, which links it directly to the UK Defence and Aerospace Contractors theme through its work on defence and nuclear programmes. It currently generates about £595 million from its Transportation segment and £468 million from Natural Resources, with all £1.1b of revenue earned in the UK. The company has a market cap of roughly £609 million, which puts it in the mid-cap bracket on the London market.

Costain Group provides exposure to UK defence-related spending without relying solely on pure-play weapons or avionics stocks. The company is focusing on higher-margin consultancy and digital solutions, underpinned by multi-year contracts in critical infrastructure, including defence, nuclear and regulated water projects. That mix, together with a P/E around the UK market average and improving net margins, is drawing interest from investors who want exposure to long-term government programmes. The flip side is its heavy reliance on UK public sector clients and external borrowing, plus recent insider selling, which could make some investors cautious about how it handles any future budget or credit shocks.

Costain Group’s pivot toward higher margin consultancy and digital work in long term government projects could be masking a bigger story. The 3 key rewards and 1 important warning sign might change how you weigh its reliance on UK public spending and recent insider selling

LSE:COST P/E Ratio as at Aug 2026
LSE:COST P/E Ratio as at Aug 2026

Senior (LSE:SNR)

Senior designs and manufactures high technology fluid conveyance and thermal management components for aerospace and defence OEMs, which places it squarely in this UK Defence and Aerospace Contractors theme as a supplier into key aircraft and military platforms. The business is split between Aerospace, which generated about £448.8 million of revenue, and Flexonics, which contributed around £310.8 million. Together these segments underline how much of Senior’s income is tied to aircraft, land vehicles and energy systems. With a market cap of roughly £1.2b, Senior sits in the larger mid cap bracket, which fits the screener’s tilt toward bigger, more established and lower risk contractors.

Investors looking at UK defence and aerospace spending often focus on the big primes, but Senior offers something different. The company is a £1.2b engineered components specialist with deep exposure to long running aircraft and defence programs such as C 130, P 8 and F 35, where management talks about meaningful production volumes and future aftermarket potential. At the same time, the recent half year loss and continued reliance on cyclical civil aerospace and land vehicle markets show that margin recovery is not guaranteed. If you are weighing that trade off between high quality programme exposure and execution risk, Senior is a stock where the headline story only scratches the surface.

Senior’s programme exposure and recent half year loss point to a story where recovery and risk are tightly linked. The analyst forecasts for Senior could show whether that mix of long running platforms and civil exposure is setting up a quiet inflection point that most investors have not fully joined the dots on yet.

LSE:SNR Earnings & Revenue History as at Aug 2026
LSE:SNR Earnings & Revenue History as at Aug 2026

Serco Group (LSE:SRP)

Serco Group runs outsourced public services for governments across defence, justice and immigration, health, citizen services and transport, which ties it into this UK Defence and Aerospace Contractors theme through long term defence support and military readiness work rather than hardware. It earns about £2.7b from the UK and Europe, £1.5b from North America, £606 million from Asia Pacific and £155 million from the Middle East, giving it a broad government customer base. The company is valued at roughly £2.5b, putting Serco Group firmly in the larger, more established end of this screener.

For investors watching UK outsourcing and defence support, Serco Group offers a mix of rising defence exposure, global diversification and active capital returns through dividends and a sizeable buyback. A large pipeline in defence, justice and migration helps underpin earnings, yet the heavy dependence on multi year government contracts and political sentiment around areas such as immigration and prisons keeps risk firmly on the table. If you are weighing up whether that trade off between contract visibility, modest margins and regulatory scrutiny is attractive, Serco Group is a stock where the headline numbers only tell part of the story.

Serco Group’s rising defence exposure and global contract base could be masking an underappreciated earnings engine. The analysis report for Serco Group lays out where that visibility might meet a less obvious pressure point hiding in plain sight.

LSE:SRP Earnings & Revenue History as at Aug 2026
LSE:SRP Earnings & Revenue History as at Aug 2026

Seeking Alternatives Beyond Defence Stocks?

Fresh ideas move first. By the time slow money reacts, early positions are already flying. Scan these curated themes before the crowd while it matters and get in early.

This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.