Is the GSK share price the biggest value trap in the FTSE 100?

GlaxoSmithKline (LON:GSK) is up a third in 15 months. But is this rally sustainable?

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.

GlaxoSmithKline (LSE: GSK) shareholders have been well rewarded over the past year. Including distributions to investors, the stock is up 13% over the past 12 months and by nearly a third over the past 15 months. That’s compared to a gain of just 5% for the FTSE 100.

The big question: Is this performance sustainable, or is the stock set for a substantial near-term decline?

Improving outlook

I believe the primary reason why the GSK share price has outperformed over the past 12 months is thanks to the actions taken by its new CEO, Emma Walmsley.

After taking over the business last year, Walmsley hasn’t been idle. She’s negotiated a massive deal to merge the company’s consumer healthcare business with Pfizer and inked two multi-billion dollar oncology deals. These include GSK’s $5.1bn acquisition of Tesaro and its pipeline of cancer treatments, as well as a $4.2bn payout to Merck.

These deals attracted some criticism at the time, but they’re already starting to pay off. Last week, GSK announced Zejula, a drug acquired in the Tesaro deal, has demonstrated its effectiveness in stopping the spread of ovarian cancer when taken after a patient has undergone chemotherapy.

Tests have also revealed the treatment could potentially have an even bigger market than initially expected as Zejula also proved to be effective regardless of whether cancer patients possessed a particular genetic mutation. This is excellent news for both GSK and ovarian cancer patients.

Consumer healthcare 

As well as boosting the company’s oncology business, Walmsley is also presiding over the merger of GSK and Pfizer’s consumer health businesses. When complete, the joint venture will have combined sales of approximately £9.8bn.

GSK will have a majority controlling equity interest of 68% and Pfizer will have an equity interest of 32%. There’s mounting speculation the partners will spin off the joint venture into an independent business when the merger is complete. This could unlock billions of dollars in value from the GSK share price.

GSK’s seems to be firing on all cylinders, and City analysts are expecting the company to report strong earnings growth this year. They’ve pencilled in earnings per share growth of 24% for the year, which puts the stock on a forward P/E of 14.9.

This may look expensive, but it’s in line with the GSK’s international peers, which are trading at a multiple of around 14.3 times forward earnings. The stock also supports a dividend yield of 4.8%.

The bottom line

So overall, even those shares in GSK have smashed the broader market over the past 15 months, it doesn’t look as if the stock is overvalued at current levels. Management’s growth initiatives are starting to pay off, and the joint venture with Pfizer could be a massive catalyst for the stock at some point during the next few years.

Considering all of the above, I think the shares still look attractive as an investment at current levels and could continue to outperform if GSK’s pipeline continues to generate results.

Rupert Hargreaves owns no share mentioned. The Motley Fool UK owns shares of and 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

Long-term vs short-term investing concept on a staircase
Investing Articles

As the stock market goes crazy, here’s a FTSE 250 share I’m thinking about buying

The stock market has officially gone haywire, with the FTSE 100 entering correction territory today. Here's what I've got my…

Read more »

Three signposts pointing in different directions, with 'Buy' 'Sell' and 'Hold' on
Investing Articles

Load up on cheap shares now – or wait to see whether they get even cheaper?

As the market fluctuates, some shares may suddenly look cheap. How an investor acts in such moments can affect their…

Read more »

Close-up of British bank notes
Investing Articles

Is this a once-in-a-decade opportunity to target a second income?

Looking to make a large second income from UK dividend shares? Now might be the opportunity you've been waiting for,…

Read more »

Front view of a young couple walking down terraced Street in Whitley Bay in the north-east of England they are heading into the town centre and deciding which shops to go to they are also holding hands and carrying bags over their shoulders.
Investing Articles

What on earth is going on with Barratt Redrow shares?

Barratt Redrow shares are the FTSE 100's biggest faller over the last month. What has been going on with the…

Read more »

Close-up of British bank notes
Investing Articles

This UK penny stock is tipped to double by City analysts!

What should we do when a favourite penny stock falls due to short-term pressures? Consider buying for the long term,…

Read more »

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

£390 of income a week from a £20k Stocks and Shares ISA? Here’s how!

Christopher Ruane explains how someone with a £20k Stocks and Shares ISA and long-term timeframe could target hundreds of pounds…

Read more »

Abstract 3d arrows with rocket
Investing Articles

Up 25% YTD! Is this red-hot penny stock still ‘cheap’?

This penny stock has been on fire in 2026. Ken Hall takes a closer look at the investment story behind…

Read more »

Man smiling and working on laptop
Investing Articles

Stock market correction? A passive income opportunity!

Looking to turbocharge your passive income? The stock market correction could be a once-in-a-decade chance to do just that, says…

Read more »