UK Backs Rolls-Royce to Build Britain's Small Modular Nuclear Reactors
A Rolls-Royce logo Philippe Oursel/Unsplash

Few FTSE 100 stocks have captured the investment imagination quite like Rolls-Royce. An investor who ploughed £5,000 into the aerospace and defence engineer on January 1, 2025, would now find their money has nearly doubled—their investment worth approximately £9,750 as the share price soared an extraordinary 95 per cent to 1150 pence per share.

Yet as the company begins 2026, a critical question confronts both loyal shareholders and would-be investors: is this one of the great industrial turnaround stories of our time, or has the market priced in more optimism than the business can realistically deliver?

The backdrop to Rolls-Royce's renaissance is genuinely impressive. Since Tufan Erginbilgic took the helm as chief executive in 2023, the company has undergone a transformation that rivals some of the most dramatic reversals in modern corporate history.

Operating profit surged 51 per cent in the first half of 2025 to £1.73 billion, with margins expanding to 19.1 per cent—the highest level in over a decade. Free cash flow climbed 37 per cent to £1.58 billion.

The company has raised full-year guidance multiple times, signalling management confidence and delivering on repeated promises to shareholders. Over a five-year horizon, Rolls-Royce shares have appreciated 934 per cent. The transformation is real.

Yet the valuation now trading on the market raises troubling questions. Rolls-Royce currently trades on a forward price-to-earnings ratio of between 36.8 and 40.7 times earnings, towering above the ten-year historical average of approximately 15 times.

This premium suggests that market participants have not merely discounted the company's current momentum—they have fully absorbed expectations of sustained excellence for years to come.

The Bull Case: Multiple Growth Drivers Still Firing Across All Divisions

The argument for higher prices rests on several legitimate pillars. Civil Aerospace, the company's largest division, is experiencing a genuine renaissance. Engine flying hours are recovering towards pre-pandemic levels, with widebody aircraft—the profitable bread-and-butter of Rolls-Royce's business—seeing particularly strong utilisation.

The international air transport association forecasts global air passenger numbers will rise 4.4 per cent in 2026, whilst cargo volumes are expected to climb 2.4 per cent. This sustained demand supports aftermarket revenues, which generate healthier margins than original equipment sales.​

The defence division presents a separate growth trajectory. Geopolitical tensions—from Middle Eastern volatility to strategic positioning in the Indo-Pacific—have prompted Governments across NATO members and allies to increase defence spending.

Rolls-Royce's defence contracts provide long-term revenue visibility and stable cash flows, insulating this division from the cyclical pressures affecting commercial aviation.​

Perhaps most intriguingly, the company's Small Modular Reactor (SMR) programme offers long-term optionality as countries transition away from fossil fuels. Industry forecasts suggest the global SMR market could reach $72.4 billion by 2033 and $295 billion by 2043, representing a 30 per cent compound annual growth rate.

Rolls-Royce recently achieved preferred supplier status with the UK government's civil nuclear programme, positioning it advantageously should this technology commercialise.​

One analyst—more bullish than the consensus—has even suggested Rolls-Royce shares could rise 31 per cent within a year, propelled by continued margin expansion and the company's evolution from a cyclical aerospace supplier into a predictable, cash-generative industrial champion.​

The Valuation Warning: When Expectations Leave Little Room For Reality

Yet beneath this surface optimism lurks a concerning dynamic. With the forward price-to-earnings ratio at over 38 times earnings, the market has essentially baked in perfection. Any stumble—missed guidance, slower-than-expected margin expansion, a surprise product issue, or an industry downturn—would likely trigger significant profit-taking.

Consider the broader economic context. Consumer spending remains under pressure across developed economies. Whilst the airline industry has proven remarkably robust, an unexpected recession or geopolitical shock could rapidly curtail business travel and reduce the utilisation rates upon which Rolls-Royce's aftermarket business depends.

The company's vulnerability to cyclical downturns, despite its improving operational resilience, remains real.​

Moreover, the consensus among City analysts paints a considerably more cautious picture than the recent share price movements suggest. The average twelve-month price target among analysts tracking the stock is £12.64 per share—implying less than 3 per cent upside from current levels.

Adding expected dividends, this suggests a meagre total shareholder return of approximately 4 per cent over the next year.​