One of the UK market’s biggest corporate splits in years is about to happen, with GSK (GSK) demerging its consumer healthcare business called Haleon. The latter should become a FTSE 100 company and give investors exposure to some of the best-known brands in toothpaste, painkillers and more.

This article will give you the essential details on Haleon and its prospects. But if you’re still unsure what to do, it’s worth looking back in history at what happens when a company splits into two. More importantly--, the demerged business rather than the original parent is often the more interesting one from an investment perspective.

Demergers happen for various reasons, such as a company under pressure from investors to realise hidden value, or a change in strategy which leads to a tighter focus on a particular area.

A study in 2003 by the Krannert School of Management found that subsidiaries spun out of companies outperformed their former parent by more than 20% over the first three years following the demerger; with most of the excess returns within the first 12 months of trading.

Demerged companies often perform better as standalone entities because management has more freedom to drive strategy rather than having to conform to a parent’s demands. This entrepreneurial spirit helps to drive earnings and the share price.

Once separated from the parent, many investors will look at a demerged company and get excited about its prospects, perhaps having failed to realise what was under the bonnet when previously part of a bigger group.

There is also a psychological benefit of being invested in a business undertaking a demerger. Suddenly you’ll have two different companies in your portfolio when you only paid for one.

That can work both ways – some people think they’ve suddenly got something for nothing, so are happy to be patient with the stock to see what returns it might generate.

Others see it as a freebie and immediately sell, which is why the share price can be volatile in the early days of being a demerged company.

Anglo American (AAL) has form when it comes to demergers. Packaging group Mondi (MNDI) was spun out of the miner in 2007 and has since done very well on the stock market.

Last year Anglo American undertook another demerger, spinning off its coal assets as Thungela Resources (TGA), whose share price has since increased more than seven-fold in value. At the time of the split, very few people thought it would be a success because coal was so out of favour.

Indivior (INDV) has nearly tripled in price since being separated from Reckitt (RKT) in 2014; and South32 (S32) is worth more than twice as much as when it was spun out of BHP (BHP) in 2015.

Demergers don’t always deliver positive returns as investors holding Wickes (WIX) since its split from Travis Perkins (TPK) have found out.

With Haleon, it’s important to note that Pfizer (PFE:NYSE) owns a 32% stake which creates an ‘overhang’, namely something that could act as a drag on the share price until the partner sells this stake, which it intends to do. Despite such an issue, demergers generally look like interesting places to make money.

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