After hitting an all-time high of 1,586p at the start of the month (August 2026), Rolls-Royce (LSE: RR.) shares have largely been trading sideways. 

I’ve been following the spectacular turnaround with enthusiasm, keen to understand the workings behind this once-in-a-decade event.

Recent results showed operating profit of £2.5bn, up 46% in H1 2026, along with a 24% rise in free cash flow to £2bn. Just those numbers alone are mindboggling, and highlight how far the business has come since the pandemic.

But with the stock having already priced in much of the optimism, can it keep going? I’ve identified three things that I believe must happen before further growth is realised.

Three pillars of growth

First and foremost is, of course, valuation. Currently sky-high, it needs to settle at a level that earnings can justify. Right now, analyst consensus puts the forward price-to-earnings (P/E) ratio around 35, which is high for any UK company.

If earnings don’t grow fast enough to reduce that multiple, the share price will struggle to gain — even if profits rise. I expect the company will continue to deliver strong results, but expectations must align with reality to keep investors happy.

Second, small modular reactors (SMRs) have become a key selling point for Rolls, but they must prove their worth beyond just talk. They’ve been sold as a flexible way to provide low-carbon power for everything from national grids to energy-hungry data centres, which sounds promising. 

But the technology still needs real-world deployment, regulatory approval, and credible funding before turning a profit. If traditional nuclear or alternative low-carbon options remain preferable, all this SMR hype could deliver nothing but debt. That would flip the script and turn the growth narrative into a balance sheet disaster.

Third, the way the price is trending can’t be ignored. The shares have been slowly readjusting towards a more horizontal trajectory, and there seems to be a key support area around 1,440p on many charts. If the price slices below that level on heavy volume, the story is likely to shift to ‘overbought’ rather than ‘parabolic growth’.

Even with no fundamental reason to turn bearish, momentum traders might still head for the exits, putting pressure on longer-term holders.

So what are experts saying?

Optimism wins the day

Major brokers still lean majority bullish:

• Berenberg recently lifted its target price to 1,900p, implying more than 20% upside from recent levels.

• Jefferies is close behind with a 1,870p target, while JPMorgan sits at 1,800p.

• Citigroup is more cautious, rating the shares Neutral with a 1,647p target.

That puts consensus at around 1,690p – almost 10% higher than today. If the three factors mentioned above have positive outcomes, it could even beat that. But even if not, it’s still a stock that deserves a closer look.

The bottom line

In my opinion, Rolls-Royce now sits at something of a crossroads. The past few years have delivered a dramatic improvement in profits and cash generation, but a lot of that progress is already reflected in the price.

If valuation stabilises, SMRs build traction, and the share price holds above key support, the rally could continue. But for now, the question remains: is this the end of the rally, or just another pause in a much longer journey?

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Mark Hartley does not hold any positions in the companies mentioned.