Rolls-Royce and SpaceX are two of the most closely watched stocks in global markets right now, though for very different reasons.
Rolls-Royce shares have delivered a staggering 1,276% return over the past five years, a performance that few stocks anywhere in the world can match.
That extraordinary run has slowed more recently, however, and investors are growing cautious as the valuation stretches to uncomfortable levels.
The group’s trailing price-to-earnings ratio now stands at 51.8, dwarfing the average FTSE 100 P/E of around 16 and raising legitimate questions about how much further the stock can realistically climb.
Despite those concerns, Rolls-Royce shares have still risen 25% in the past three months, buoyed by a strong set of half-year results released on 30 July.
Revenues beat expectations once again, rising 26% to £11.3bn, with the Civil Aerospace, Defence, and Power Systems divisions all contributing meaningfully to that growth.
The board raised its full-year guidance again, and chief executive Tufan Erginbilgiç has a track record of beating those targets, though the elevated valuation leaves little margin for error.
SpaceX’s journey since its IPO on 12 June has been considerably more turbulent, with shares rocketing from their $135 starting price before crashing 50% in dramatic fashion.
A recovery followed, with the stock jumping 15% on 7 August to close at $133, roughly back where it started, after second-quarter results showed revenues surging 92% year on year to $7.8bn.
The group’s quarterly loss narrowed sharply from $1bn a year earlier to $541m, while its Starlink connectivity business remains profitable and its AI segment posted revenues that tripled to $2.56bn.
Infrastructure investment within the AI division flew to $15.8bn, underscoring the enormous capital demands the business faces as it scales its most ambitious operations.
Both stocks are also exposed to broader macroeconomic and geopolitical forces, including developments in the Iran war, the interest rate outlook, and ongoing debate over whether artificial intelligence valuations have entered bubble territory.
Among the 16 analysts offering one-year price forecasts for Rolls-Royce, the consensus target sits at 1,701p for August 2027, implying a modest 10% gain from current levels.
That relatively restrained outlook appears to confirm the view that Rolls-Royce is beginning to top out after its extraordinary multi-year run, with limited upside remaining at today’s price.
The picture looks rather different for SpaceX, where 33 analysts have produced a consensus target of $225 for August 2027, representing a potential gain of 69% from current levels.
Those forecasts should be treated with caution given SpaceX’s sheer newness as a publicly traded company, and questions remain over what pre-IPO investors will do when their lock-in periods expire.
Nevertheless, for investors with an appetite for risk and room for additional technology exposure in their portfolios, SpaceX is beginning to look worth considering once again at these levels.
Rolls-Royce remains a remarkable business, but at its current valuation even the slightest operational stumble could be punished severely by a market that has already priced in considerable optimism.
Both stocks will continue to attract intense scrutiny throughout the remainder of 2026 and into 2027, as investors weigh growth potential against increasingly demanding entry prices.