GSK shares plummet 20%! What’s going on here?

GSK shares fell on Monday morning on the back of a demerger and a consolidation. So maybe this represents a buying opportunity?

The content of this article was relevant at the time of publishing. Circumstances change continuously and caution should therefore be exercised when relying upon any content contained within this article.

You’re reading a free article with opinions that may differ from The Motley Fool’s Premium Investing Services. Become a Motley Fool member today to get instant access to our top analyst recommendations, in-depth research, investing resources, and more. Learn More.

Young female analyst working at her desk in the office

Image source: Getty Images

GlaxoSmithKline (LSE:GSK) shares were the FTSE 100‘s biggest faller on Monday morning. The stock fell following its long-planned demerger and the listing of Haleon (LSE:HLN), with the consumer healthcare spin-off becoming one of Europe’s largest listing in more than a decade.

So why is the share price falling, and does this represent an opportunity for me to buy?

Why is the share price falling?

GSK stock fell after the London-based multinational pharmaceutical and biotech firm’s demerger went live. Investors who had stock in Glaxo will now receive shares in the consumer healthcare company.

Haleon, which is now the largest consumer healthcare business in the world, opened with a share price of 330p, giving it a market value of about £31bn. Is it poised to join the FTSE 100, qualifying it in terms of market-cap by some distance.

As such, GSK shares should be falling by an equivalent value with shareholders reimbursed by the award on Haleon shares. Glaxo is currently down 343p. But with Haleon shares worth 330p, the fall is roughly cancelled out by the Haleon listing.

However, Glaxo has decided to complicate matters for everyone involved by also undertaking a consolidation. The thing is, nobody knows exactly what this consolidation is going to look like. It will take place after close of trading on Monday, returning the share price to roughly the same as before the demerger.

Therefore, valuing GSK shares is quite difficult right now.

Demerger benefits

The demerger has been touted as an opportunity for Glaxo to push forward after a sustained period of underperformance. For years, GSK has operated as a pharmaceutical company with a huge consumer healthcare business trading in a fast-moving retail segment that is largely reliant on marketing everyday products to customers.

Pharmaceuticals is very different. The industry requires years of research and trials before a product is finally brought to market. At which point it is sold not to regular consumers, but to governments and healthcare trusts.

As such, the two businesses are not necessarily well aligned.

The demerger should allow GSK to focus on vaccine and drug development. However, the failure of the firm to make its own Covid-19 vaccine during the pandemic is perhaps a reflection of its underperformance in recent years.

Would I buy GSK shares?

I’d buy Glaxo shares at the current price ahead of what will hopefully be a new era of prosperity for the pharma giant.

There are several reasons for this. Firstly, the demerger has clear benefits for both businesses. But secondly, I’m fairly bullish on pharmaceuticals over the long run. With ageing populations in the West, there is increasing need to invest in lifesaving medicines. It’s all about the prolonging the period of healthy lives.

Moreover, for sometime, GSK has also been undervalued verses its peers although the Haleon spin-off and consolidation makes valuation a little difficult right now. It also boasts a healthy dividend yield around 4.2%.

Supply chain issues and inflation pushing up costs are certainly issues to contend with, but I’m still bullish for a GSK renaissance.

James Fox has no positioned in any of the shares mentioned. The Motley Fool UK has recommended GlaxoSmithKline. 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.

More on Investing Articles

Young mixed-race couple sat on the beach looking out over the sea
Investing Articles

Looking for a £750 monthly passive income? Here’s how much it takes

The idea of buying dividend shares for their passive income potential can sound promising. How might the nuts and bolts…

Read more »

Calendar showing the date of 5th April on desk in a house
Investing Articles

£20,000 in this ISA portfolio would generate £1,400 in passive income

Ben McPoland presents a ready-made Stocks and Shares ISA portfolio containing five UK names that as a group currently yield…

Read more »

Person holding magnifying glass over important document, reading the small print
Investing Articles

The most underrated stock in the FTSE 100?

Nobody seems to like the FTSE 100’s water utilities. But could Severn Trent be the biggest opportunity that investors aren’t…

Read more »

a couple embrace in front of their new home
Investing Articles

£1,000 now buys 1,075 Taylor Wimpey shares. Worth it for the 8% dividend yield?

There’s a massive dividend yield on offer from his well-known UK housebuilder right now. But what are the risks for…

Read more »

Night Takeoff Of The American Space Shuttle
Investing Articles

Want to invest in SpaceX, Revolut, and TikTok? Consider buying this FTSE 100 stock

Ben McPoland thinks this FTSE 100 investment trust is a top stock to consider buying to gain exposure to the…

Read more »

Calendar showing the date of 5th April on desk in a house
Investing Articles

Here’s my Stocks and Shares ISA plan for 2026/27

Stephen Wright has a clear plan when it comes to investing in his Stocks and Shares ISA. But do the…

Read more »

Two elderly people relaxing in the summer sunshine Box Hill near Dorking Surrey England
Investing Articles

Where to look for safety in today’s stock market?

Stephen Wright has been looking for safety in a specific place in today’s stock market. And Warren Buffett’s firm has…

Read more »

Young black colleagues high-fiving each other at work
Investing Articles

This 5-share ISA could deliver an amazing second income of £762 a month

As the world’s stock markets plunge, many yields are rising. James Beard looks at five shares that could generate an…

Read more »