The largest FTSE 100 stock just fell 8%! Should investors buy?

The biggest FTSE 100 stock by market capitalisation fell 8% in yesterday’s trading. Could this be a buying opportunity for investors?

| More on:

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.

Young Black woman looking concerned while in front of her laptop

Image source: Getty Images

When investing, your capital is at risk. The value of your investments can go down as well as up and you may get back less than you put in.

Read More

The content of this article is provided for information purposes only and is not intended to be, nor does it constitute, any form of personal advice. Investments in a currency other than sterling are exposed to currency exchange risk. Currency exchange rates are constantly changing, which may affect the value of the investment in sterling terms. You could lose money in sterling even if the stock price rises in the currency of origin. Stocks listed on overseas exchanges may be subject to additional dealing and exchange rate charges, and may have other tax implications, and may not provide the same, or any, regulatory protection as in the UK.

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.

When FTSE 100 stocks suddenly plummet in value, it often pays to take notice. Sudden downward movements in share prices can sometimes be good opportunities to enter positions at a bargain level. However, there’s always a risk that aggressive selling can continue.

With a market cap of £166.1bn, AstraZeneca (LSE:AZN) is the Footsie’s largest constituent. In the wake of disappointing lung cancer drug trial results, shares in the biotech giant went into a tailspin on Monday.

So, could today be an opportune moment for investors to add the stock to their portfolios? Or does recent news mean this is a company to avoid? Here’s my take.

A tarnished trial

Clinical trials can have a considerable impact on the share prices of pharmaceutical companies. Since patent protection for medications only lasts for 20 years, these firms rely heavily on bringing new drugs to market for future revenue.

In that context, AstraZeneca saw almost £14bn wiped off its valuation after releasing the phase III trial results for its new lung cancer drug, datopotamab deruxtecan. Although the study showed the medicine could delay the progression of cancer for longer than current chemotherapy, it didn’t show conclusive evidence that patients would live longer.

In addition, the drug caused some side-effects leading to lung scarring. Most of these incidents were ‘low grade’, but the company also found there were some ‘grade 5’ events — essentially, deaths.

Concerns about the drug’s efficacy and safety have knocked investor confidence in AstraZeneca, dashing some hopes that the medicine could produce £8bn in sales. Lung cancer is the second-most common cancer worldwide. There are plenty of healthcare firms in the race to develop a blockbuster treatment for the condition.

However, there’s an argument the stock has been oversold on a single news event. The study is ongoing and it’s difficult to reach a definitive judgment on the drug’s prospects until further analysis has been conducted.

Business fundamentals

There’s more to AstraZeneca’s business than a single drug. The company has a large moat and focuses on a wide range of therapy areas, including respiratory diseases, inflammation, cardiovascular and metabolic diseases, and oncology too. It has 178 projects in its pipeline.

The firm continues to make progress in key jurisdictions. Its Q1 performance in emerging markets was particularly strong and the company is solidifying its competitive advantage in the enormous Chinese market.

Plus, AstraZeneca’s flagship breast cancer drug Enhertu has already been approved for treatment in multiple countries. But it may have even more potential thanks to recent compelling results showing its effectiveness in shrinking other tumours.

A FTSE 100 stock to buy?

If investors are considering adding AstraZeneca shares to their portfolios, now could be a good time to do further research. The stock’s already showing signs of a recovery in this morning’s trading as investors digest the latest news.

After all, there’s considerable potential in the company’s pipeline, despite one disappointing trial.

That said, it’s not a cheap stock. With a price-to-earnings ratio of 44.7, AstraZeneca can’t afford too many underwhelming trials before investors start to question whether it’s overpriced.

Regarding my own portfolio, I already have a position in the company and I’m holding my shares. If there’s further downwards movement, I’ll consider buying some more.

Should you invest, the value of your investment may rise or fall and your capital is at risk. Before investing, your individual circumstances should be assessed. Consider taking independent financial advice.

Charlie Carman has positions in AstraZeneca Plc. The Motley Fool UK has no position in any of the shares mentioned. 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

Investing Articles

Can Rolls-Royce shares keep on soaring in 2025?

2024 so far has been another blockbuster year for Rolls-Royce shares. Our writer thinks the share could still move higher.…

Read more »

Mindful young woman breathing out with closed eyes, calming down in stressful situation, working on computer in modern kitchen.
Investing Articles

Here’s the worst thing to do in a stock market crash (it isn’t selling)

When the stock market falls sharply – as it does from time to time – selling is often a bad…

Read more »

New year resolutions 2025 on desk. 2025 resolutions list with notebook, coffee cup on table.
Investing Articles

My top 2 growth shares to consider buying in 2025

For investors looking for top growth shares to buy in the New Year, I reckon this pair are well worth…

Read more »

Investing Articles

3 massive UK shares that could relocate their listing in 2025

I've identified three UK companies that may consider moving their share listing abroad next year. What does this mean for…

Read more »

Young Asian woman with head in hands at her desk
Investing Articles

2 common mistakes investors make with dividend shares

Stephen Wright outlines two common mistakes to avoid when considering dividend shares. One is about building wealth, the other is…

Read more »

Investing Articles

Here’s how I’ll learn from Warren Buffett to try to boost my 2025 investment returns

Thinking about Warren Buffett helps reassure me about my long-term investing approach. But I definitely need to learn some more.

Read more »

Businessman use electronic pen writing rising colorful graph from 2023 to 2024 year of business planning and stock investment growth concept.
Investing Articles

Here are the best (and worst) S&P 500 sectors of 2024

While the S&P 500 has done well as a whole, some sectors have fared better than others. Stephen Wright is…

Read more »

Investing Articles

2 FTSE 100 stocks I think could be takeover targets in 2025

If the UK stock market gets moving in 2025, I wonder if the FTSE 100 might offer a few tasty…

Read more »