One of the most important things investors can do is hold their hands up and admit their mistakes.
And Carillion(LSE: CLLN) was a howler for me. A few months ago I liked the look of forecast dividend yields of around 8.5% after the shares had lost a third of their value in two years. I was aware of the risks, but thought there was room for a dividend cut while still offering decent value.
I did not expect a complete suspension of the dividend. Or the resulting 66% share price fall to 65p.
But that's what happened after a profit warning on 10 July, with the dividend suspended to save £80m after a failure to meet half-year expectations, and now with the expectation of missing full-year forecasts. And chief executive Richard Howson has resigned.
There's going to be a provision of £845m hitting the books, and net borrowing is likely to climb to £695m. That's a fair old whack for a company with a market cap of just £293m, and it renders the now single-digit P/E multiples meaningless (even if they weren't based on pre-shock forecasts).
I'm not buying
The big question is whether Carillion is an oversold bargain now, or a rapidly descending cutting tool.
The news is actually not all bad, with some of the problem down to the timing of now-delayed Public Private Partnerships equity disposals. And the company is apparently progressing well on its cost-reduction strategy and has been winning some new contracts.
But the shock, combined with the seriousness of the firm's reaction and that scary debt level, leaves me feeling there could be worse to come before things improve.
A more attractive option
I'm going to stick my neck out now and say I like the look of another outsourcing firm, while hoping my favouring it does not sound another death knell. This time it's Aggreko(LSE: AGK), a company which provides rental power, temperature control and compressed air systems.
The firm's specialisation should, I reckon, provide a more defensive proposition than Carillion's more general construction services, with customers less likely to look to competitors or to do it themselves in the current challenging business environment.
Aggreko's share price has fallen, losing 66% since a peak in September 2012 -- but it has still easily beaten the FTSE 100 over 10 years, with a gain of 49% compared to just 19% for the index.
The share price slump follows four years of crumbling EPS, with a further 6% fall on the cards for 2017. But a 12% rise pencilled in for 2018 would drop the P/E to 13, with a 3% dividend yield.
Is the dividend at risk?
Net debt at December 2016 stood at £649m, but this is a much larger company with a market cap of £2.2bn and annual revenue of £1.5bn, and by that comparison I don't see a problem.
Forecasts for 2018 suggest a PEG ratio of 1.1, and while that's not low enough to look like a sure-fire hit with growth investors, I think it's actually quite attractive.
I also see Aggreko as being in the tail-end of its down spell and starting up the other side, while I fear that Carillion still has a deeper hole to dig. With sentiment poor, it could take time for an Aggreko share price recovery to happen, but I see a buying opportunity now.
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Alan Oscroft has no position in any shares mentioned. The Motley Fool UK has no position in any of the shares mentioned. 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.