As Rolls-Royce shares hit another all-time high, am I missing out for the wrong reason?

Christopher Ruane reflects, as Rolls-Royce shares continue to reach impressive highs, whether he ought to put his doubts aside and invest.

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Rolls-Royce's Pearl 10X engine series

Image source: Rolls-Royce plc

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Has it been a bad week for shareholders in Rolls-Royce (LSE: RR), watching the share’s bull run come crashing to an end? Not a bit of it! In fact, this week saw Rolls-Royce shares hit yet another all-time high, something that has happened repeatedly so far this year.

I think the share could potentially go even higher from here.

I have been sitting on the sidelines since I sold my Rolls-Royce shares at a much lower price than their current level. So should I reassess my logic and consider adding the aeronautical engineer back into my portfolio?

Ignoring the momentum

While I have missed out on the recent share price action, I am not fearful of missing out. I buy or sell shares based on what potential value I think they offer me at their current price, not based on what lots of other people are doing.

So while Rolls-Royce shares have had great momentum of late, that can change in an instant. Momentum can work negatively, as well as positively.

Therefore, if I buy a share it is not simply because of its current momentum – I base my decisions on what I see as the underlying fundamentals of the business concerned.

Here’s why I sold

At one point, obviously, I liked the underlying investment case for Rolls-Royce shares. In fact, I still do. After all, it operates in a market with high barriers to entry. It has considerable competitive advantages, including its proprietary engine technology, large installed base of engines and very well-regarded brand.

Those, combined with current management’s aggressive goal-setting and proven ability so far to deliver on those targets, are all attractive to me. They also make me think that, if things keep going well, the Rolls-Royce share price may potentially move up even higher from its recent all-time highs.

Why, then, did I sell? While I continued to like the underlying investment case (and still do), I thought the valuation had become unattractive. Specifically, I do not think it properly accounts for the risk of a sudden, unforeseen collapse in civil aviation demand badly hurting demand for engine sales and maintenance.

Was I wrong?

So far, that has not happened. Meanwhile, Rolls-Royce shares have gone from strength to strength.

If I had hung onto my shares, I would have made a lot more than I did. Even if I bought some today and that risk did not come to pass, I think I could potentially still do well.

So was I wrong to sell? Hindsight is a wonderful thing, of course, but I think my risk analysis was logical. Just because a risk has not come to pass does not mean it was not (or is not) still a risk. Indeed, that is precisely what makes a risk a risk – that element of the unknown.

That risk remains today and I do not think the current Rolls-Royce share price offers me sufficient margin of safety to mitigate it. So I will not be investing.

C Ruane has no position in any of the shares mentioned. The Motley Fool UK has recommended Rolls-Royce Plc. Views expressed on the companies mentioned in this article are those of the writer and therefore may differ from the official recommendations we make in our subscription services such as Share Advisor, Hidden Winners and Pro. Here at The Motley Fool we believe that considering a diverse range of insights makes us better investors.

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