Picking shares can be tricky...

BUYING individual shares is a hazardous business, writes John Stepek, executive editor of MoneyWeek magazine, in this article from his free Money Morning email.

That's why we have diversified portfolios, and that's why the majority of investors hold the lion's share of their equities in funds of some sort, rather than holding individual companies.

It's also why I try to avoid tipping individual stocks – however convinced you are of a stock's merits, you can never be sure that something won't go wrong.

And so it has proved with my pre-Christmas share tip. In our 20 December issue of MoneyWeek, I suggested buying high-street stalwart Marks & Spencer (M&S), perhaps bolstered by the success of my 2018 tip, Next.

I shouldn't have got cocky – mid-January, M&S promptly issued a Christmas trading update that sent its share price down by more than 10%.

The group managed to grow like-for-like sales, but a poor performance from its clothing business saw disappointed investors sell out.

I'll admit that I was in two minds about the original tip. I've slagged M&S off on several occasions over the years. My overall view – that it's a complacent business that has been riding on the back of its undeserved "national treasure" status for years, if not decades, hasn't changed dramatically.

I even described it as being "not a terribly good company" and one "with a long history of disappointing". So I can't argue that this latest failure comes out of the blue. It's clear that both the wider market and I had grown far too optimistic on the pace of its latest turnaround.

So what's the story now?

I can't say I'm pleased to have tipped a stock that has fallen by the best part of 15% in less than a month. That said, I'm going to give it the benefit of the doubt for now.

Firstly, I think the fall mostly reflects the fact that investors had got their hopes up for a faster pace of change.

Secondly, as I also pointed out in the original tip, if M&S's recovery really can't get any momentum behind it, then there's surely scope for an activist investor to start pressing the board to split the group. With M&S's deal with online grocery specialist Ocado coming to fruition this year, the shedding or shrinking of the troubled clothing and homeware units might be the best turnaround plan of all.

It's a useful reminder that buying shares in troubled companies in the hope that they can turn themselves around is always a tricky business. If you'd rather stick to companies with more solid foundations, then turn to MoneyWeek stories such Stephen Connolly's recent analysis, where he picks ten of his favourite high-quality European stocks that could be well placed to catch up with their more highly-valued peers in the US this year.

Elsewhere in the magazine already this year, Max King has looked at three of the biggest investment themes in the UK's commercial property market right now. Student housing, healthcare premises, and self-storage are all booming, and for good reason – but have valuations been driven too high? Read his verdict with a MoneyWeek subscription.

And for the truly adventurous investor, David Stevenson has looked at a new exchange-traded fund (ETF) that enables investors to gain access to one of the most intriguing and controversial sectors around right now – the cannabis industry. That industry has already been through one boom and bust, but I'm quite sure that there will be plenty more ups and downs to come. Not unlike the rather less exotic M&S.