We have some exciting news to share! The Motley Fool UK has now become 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. We’ll be introducing a new name and brand over the coming weeks — we're very excited to share it with you and embark on this new chapter together!

What do low PEG ratios tell us about these FTSE 100 shares?

The PEG ratio is often overlooked by investors — maybe because it takes a little longer to work out than the P/E ratio. What does it say about these FTSE 100 shares?

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 black colleagues high-fiving each other at work

Image source: Getty Images

FTSE 100 shares are frequently described as cheap by analysts, and have been for a while. That’s often backed up by the price-to-earnings, the price-to-sales ratio, and the price-to-book ratio.

However, we shouldn’t invest because of a company’s performance last year. And we’re not investing just for the next 12 months. It’s about how a company will perform throughout the medium and long term.

PEG ratios

Thus, growth is central to the equation. That’s where the PEG ratio can help us. This metric provides a valuable tool for investors seeking to assess a company’s growth potential in relation to its current valuation.

The PEG ratio, or price/earnings-to-growth ratio, takes into account both the price-to-earnings (P/E) ratio and the expected earnings growth rate.

A PEG ratio of 1 is often considered indicative of fair value, suggesting that the stock’s price is in line with its anticipated growth.

Ratios below 1 may suggest that the stock is undervalued relative to its growth prospects, while ratios some distance above 1 may indicate potential overvaluation.

Nonetheless, this is just a rule of thumb and it’s often prudent to compare companies within the same sector. For example, the PEG ratio is often calculated using annualised growth rates over five years and some industries may see tailwinds further into the long run.

By incorporating expected earnings growth into the assessment, the PEG ratio offers a more comprehensive view than the P/E ratio alone. This is particularly relevant in industries or sectors where high-growth companies might justify higher valuations.

FTSE 100 shares with low PEGs

As noted above, it can pay to compare companies within the same industry. However, the below data provides us with an insight into some of the cheapest stocks on the index. This is just a handful of stocks with PEG ratios that looks pretty attractive.

PEG Forward
AstraZeneca 1.5
Burberry1.4
Hikma1.2
Lloyds0.5
Rolls-Royce0.5
Smith & Nephew1.4
FTSE 100 shares: PEG ratios

This PEG data can be used as the basis to make informed investment decisions. However, the PEG ratio does have one main drawback. That’s the fact it’s reliant on estimated future growth rates. These estimates are subjective and can vary among analysts, introducing a degree of uncertainty into the calculation.

However, the above data broadly reiterates widely-shared sentiment that companies like Lloyds and Rolls-Royce are undervalued. It also provides us with important data about stocks that are less frequently considered, including generics manufacturer Hikma.

AstraZeneca is another interesting company to see on this list. The pharma giant trades around 30 times earnings, but analysts anticipate this R&D-driven business to continue growing an impressive rate throughout the medium term.

It’s also possible that AstraZeneca, Hikma, and Smith & Nephew will continue growing strongly beyond the medium term. This is because there’s a broad understanding that ageing global populations will cause demand for new drugs, generic products, and medical devices, to surge.

As such, from my notes above, it’s clear that the PEG ratio is good starting point for assessing stocks and making informed investment decisions.

James Fox has positions in AstraZeneca Plc, Lloyds Banking Group Plc and Smith & Nephew Plc. The Motley Fool UK has recommended AstraZeneca Plc, Burberry Group Plc, Hikma Pharmaceuticals Plc, Lloyds Banking Group Plc, and Smith & Nephew Plc. 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

Passive income text with pin graph chart on business table
Investing Articles

Here’s how much to put in your ISA if you hope for passive income of £21,000

With a diversified portfolio of high quality shares and a disciplined investment mindset, Mark Hartley outlines his passive income strategy.

Read more »

Happy woman commuting on a train and checking her mobile phone while using headphones
Investing Articles

Here’s how someone could start buying shares for the price of a weekend break

Is it really possible to start buying shares for the cost of a quick getaway? Our writer explains how it…

Read more »

Bus waiting in front of the London Stock Exchange on a sunny day.
Investing Articles

2 top growth shares to consider on the London Stock Exchange

There are plenty of UK stocks to buy that have potential long runways of growth. Here, our writer highlights two…

Read more »

Smiling white woman holding iPhone with Airpods in ear
Investing Articles

£20k invested in a Stocks and Shares ISA this time last year is now worth…

What has 12 months meant for the value of a Stocks and Shares ISA? That depends on how it has…

Read more »

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

While everyone’s piling into AI infrastructure stocks like Micron and SanDisk, consider these out-of-favour Nasdaq 100 names

There’s very little interest in these Nasdaq-listed AI stocks right now despite the fact they’re generating impressive growth. Could this…

Read more »

Workers at Whiting refinery, US
Dividend Shares

Here’s why 2026 has been bumpy for the BP share price

The BP share price has had a good 2026, rising 24% so far. However, ever since the US attacked Iran…

Read more »

A beach at sunset where there is an inscription on the sand "Breathe Deeeply".
Investing Articles

How oil price volatility is impacting stock market sentiment — and how to prepare

As the Middle East crisis deepens, oil price shocks are sending ripples through global stock markets. Mark Hartley considers a…

Read more »

Man thinking about artificial intelligence investing algorithms
Investing Articles

Meet the £7 FTSE 250 tech stock that’s outperforming Nvidia, AMD and Micron in 2026

This FTSE 250 artificial intelligence stock has generated enormous returns in 2026 amid high demand for its products. Is it…

Read more »