We have some exciting news to share! The Motley Fool UK has now become The Twelfth Magpie -- an independent, UK-owned company, led by our long-serving UK management team — Mark Rogers, Chris Nials and Heather Adlington. In practical terms, it’s the same team you know, now fully focused on serving our UK readers and members.

Just as importantly, our approach remains unchanged: long-term, jargon-free, and on your side. This site is our new home, and there will be extra tweaks made across the coming few days as we settle in. So if anything looks a little off, please bear with us!

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.

This is the FTSE 100’s worst-performing share over a year. I’m happy to own it!

This popular stock is the FTSE 100’s worst-performing share over 12 months. It’s crashed by a sixth (16.6%). Why do I keep buying it? Here’s the answer!

A GlaxoSmithKline scientist uses a microscope

Image: GlaxoSmithKline

You’re reading a free article with opinions that may differ from The Twelfth Magpie’s Premium Investing Services. Become a member today to get instant access to our top analyst recommendations, in-depth research, investing resources, and more. Learn more, and get a free 'Best Buy Now' stock!.

The past year has been pretty good for the FTSE 100 index. As I write, the Footsie stands at 6,919.88 points. On 14 April 2020, it closed at 5,791.30, hit by surging Covid-19 infections. Thus, the index is up almost 1130 points in 12 months — almost a fifth (19.5%). Of course, as a broad market index, the FTSE 100 tells us nothing about individual share successes and failures. Alas, my largest shareholding is the FTSE 100’s worst performer over the past year.

The FTSE 100 rebounds

As panic over Covid-19 gripped markets, global stock prices collapsed last spring. By 23 March, the FTSE 100 had plunged to a closing low of 4,993.89. However, thanks to massive monetary support from central banks and fiscal support from governments, optimism soon returned. Share prices soared, with this confidence continuing into this year. In 2021, the Footsie has already added almost 460 points (7.1%).

Should you buy Rolls Royce shares today?

Before you decide, please take a moment to review this report first. Despite ongoing uncertainties from US tariffs to global conflicts, Mark Rogers and his team believe many UK shares still trade at substantial discounts, offering savvy investors plenty of potential opportunities to learn about.

That’s why this could be an ideal time to secure this valuable research – Mark’s analysts have scoured the markets to reveal 5 of his favourite long-term ‘Buys’. Please, don’t make any big decisions before seeing them.

Over the past year, there have been huge variances in share performances within the FTSE 100. Good news: of the 101 stocks in the Footsie, no fewer than 89 have risen in value over 12 months. These uplifts range from a tiny 0.1% to an impressive 138.6%. Eight of these winning stocks have doubled or better since 14 April 2020. The average gain among these 89 winners is a tidy 45.5% (more than double the 19.5% gain of the wider index).

This is the Footsie’s biggest loser

At the other end of the scale lie 11 losers: the FTSE 100 shares that lost value over the past year. These losses range from just 0.5% to 16.6%, with the average loss coming to 7.4%. But these 11 losers include some real heavyweights, including a global bank, two giant oil companies, and a major pharmaceutical firm. Now for the bad news: shareholders of GlaxoSmithKline (LSE: GSK) own the FTSE 100’s worst-performing share over the past 12 months. I count myself among their number, as GSK is my biggest individual shareholding. Am I annoyed that the GSK share price has fallen by a sixth in a year? Yes! Am I rushing to sell? No! Here’s why.

I think the GSK share price is too cheap

As a young investor in the 1980s/90s, I would often make snap decisions, many of which backfired. After 35 years, I know to take stock before making considered decisions. So, why aren’t I selling the FTSE 100’s biggest loser today? Because I believe these shares to be undervalued and hence due a future re-rating. Also, having fallen over 30% from their 2020 peak (1,857p on 24 January 2020), I don’t see much more downside.

At the current share price of 1,295p, GSK shares trade on a price-to-earnings ratio of 11.26 with an earnings yield of 8.9%. But GSK is the world’s largest vaccine maker by revenue, so its 2020 earnings were depressed by routine vaccination programmes being abandoned during the pandemic. As Covid-19 recedes, these earnings should recover. Meanwhile, the steady 80p-per-share yearly cash payout equates to a dividend yield of 6.2% (almost double that of the wider FTSE 100).

GSK is undergoing rapid change and I do see some risks. It plans to split into two separate businesses in 2022 (BioPharma and Consumer Healthcare), which might hurt earnings. Also, the dividend is set to fall, which is bad news for income investors. And history suggests such radical corporate restructuring can have mixed results, often leading to worse returns. Nevertheless, while GSK’s stock trades at a big discount to the wider FTSE 100, I’ll keep buying more shares by reinvesting my juicy dividends.

Cliffdarcy owns shares of GlaxoSmithKline. 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

Black woman using smartphone at home, watching stock charts.
Investing Articles

The stock market game you’re actually playing (and why you might be losing)

Our writer recounts a painful experience of making a rash stock market decision based on emotions, not logic – and…

Read more »

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

Why is EasyJet stock suddenly a takeover target for US investors?

Andrew Mackie looks at easyjet shares jumping on US takeover talk — but is this a genuine re-rating or just…

Read more »

Young Black woman looking concerned while in front of her laptop
Investing Articles

Have investors got BT shares all wrong?

BT shares spiked during the 1990s telecom boom, then struggled for two decades. Harvey Jones says it's the future that…

Read more »

BUY AND HOLD spelled in letters on top of a pile of books. Alongside is a piggy bank in glasses. Buy and hold is a popular long term stock and shares strategy.
Investing Articles

Looking for buying opportunities in June? Here’s 1 to consider from my Stocks and Shares ISA

The conflict in Iran is making one of the investments in Stephen Wright’s Stocks and Shares ISA volatile. But could…

Read more »

Row of blue European Union flags in Brussels.
Investing Articles

After crashing 13.7% today, is Wise now a stock market bargain at 805p?

Wise was one of the biggest fallers on the UK stock market today. What on earth is going on with…

Read more »

Road 2025 to 2032 new year direction concept
Investing Articles

At 8% is this eye-popping FTSE 100 dividend yield simply too good to be true?

The dividend yield is to die for, but the share price is lacking in life. Harvey Jones examines whether this…

Read more »

The flag of the United States of America flying in front of the Capitol building
Investing Articles

UK investors are piling into this legendary S&P 500 growth stock while it’s down 50%

This US growth stock fell from $240 to $80 amid AI disruption fears. And investors are now aggressively buying it…

Read more »

Abstract 3d arrows with rocket
Investing Articles

£19,469 invested in BAE Systems shares 6 months ago is now worth…

BAE Systems shares have been charging higher of late. Is now the time to consider buying or is this top…

Read more »