Share your opinion and earn yourself a free Motley Fool premium report!

We are looking for Fools to join a 75 minute online independent market research forum on 15th / 16th December.

To find out more and express your interest please click here

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

Portrait of pensive bearded senior looking on screen of laptop sitting at table with coffee cup.
Investing Articles

From hero to zero: are Lloyds shares a ticking time-bomb after a 70% gain in 2025?

In 2025, Lloyds shares have produced around 10 years’ worth of average stock market gains. Could they be heading for…

Read more »

Young female business analyst looking at a graph chart while working from home
Investing Articles

Which stock market is best: the UK or US? Here’s how British investors can benefit regardless

Stock market diversification helps spread risk and capitalise on growth and income. Mark Hartley considers the options for British investors.

Read more »

Exterior of BT Group head office - One Braham, London
Investing Articles

Will the epic BT share price surge 77% in 2026?

BT's share price is tipped to rise next year. Discover what could drive the FTSE stock higher -- and what…

Read more »

Friends at the bay near the village of Diabaig on the side of Loch Torridon in Wester Ross, Scotland. They are taking a break from their bike ride to relax and chat. They are laughing together.
Investing Articles

I asked ChatGPT for 5 world-class UK stocks for a retirement portfolio. Here’s what it gave me

Searching for top-quality UK stocks for a retirement portfolio? Here are some names that the world's most popular generative AI…

Read more »

Happy male couple looking at a laptop screen together
Investing Articles

I just asked ChatGPT a really stupid question about FTSE 100 stocks and it said…

Harvey Jones insulted artificial intelligence by asking it a very basic question about which FTSE 100 stocks to buy and…

Read more »

Road trip. Father and son travelling together by car
Growth Shares

The share price of my favourite FTSE 100 growth stock can’t stop falling. Time to buy?

Paul Summers loves the near-monopoly this FTSE 100 company enjoys. But he's also concerned its shares have tumbled over 20%…

Read more »

UK coloured flags waving above large crowd on a stadium sport match.
Dividend Shares

Shock news: over 1 year, the FTSE 100 is beating the S&P 500!

For most of the last 15 years, the US S&P 500 index has thrashed the UK's FTSE 100. However, this…

Read more »

Aerial shot showing an aircraft shadow flying over an idyllic beach
Investing Articles

Why are investors flooding into IAG shares this week?

In the last week, investors have been snapping up IAG shares like there's no tomorrow. What could have sparked the…

Read more »