3 red flags when I’m looking for the best shares to buy now

From extreme ratios to high volatility, Jonathan Smith explains some of the things he avoids when looking for the best shares to buy now.

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.

When I’m looking for the best shares to buy now, I usually screen for them with positive criteria. What I mean by this is that I look for the good points in the companies I’m considering. For example, a firm that has grown profits year after year at a good pace would mean a tick on my checklist. On the other hand, I do also need to look for negative red flags. And here are some of the important ones that I keep an eye out for.

Extreme ratios

A good metric that can be used to find the best undervalued shares to buy now is the price-to-earnings ratio. This measures the proportion of earnings relative to the current share price. In theory, if the ratio is lower than average then it could suggest the share price is undervalued. 

A red flag here is if the P/E ratio is very low. In this case, it might not suggest an undervalued share worth snapping up. Rather, it could reflect a struggling business that I need to avoid.

For example, it might be low because investors are expecting profit to tank in the next report. With the pandemic still negatively impacting companies, this is something I need to watch out for.

Another red flag is a too-good-to-be-true dividend yield. This yield is a good metric to look at the income I’d receive from dividends. Yet I need to be careful in just using this number without any other checks.

A company could have a very attractive dividend yield and the reason for this might be sustainable. But it might not. For example, a falling share price would artificially boost the dividend yield. In the future, the dividend might be cut if the falling share price is due to a financially unstable business. So it actually wouldn’t be the best share to buy now.

A top share, but potentially high volatility

Something I need to look out for is the volatility of the best shares to buy now. A stock might be moving higher, with a lot of interest from investors. But if the volatility is very high, it could ring alarm bells for me. This is because the potential drawdowns in the share price could be high. On a day to day basis, I could see wild swings that might put me off. 

Volatility can be my friend at times. But before I choose to buy the share I’m considering, I need to make sure I’m happy with taking on the emotional rollercoaster of a volatile stock.

With all the three red flags I’ve mentioned, it’s important to note that they’re my opinion. There will be some shares with a low P/E ratio or a high dividend yield that I’ll stay away from. Another investor might be happy with the risks, and it could work out in their favour. Even with volatility, some investors see this as a green flag, not a red one! 

Views expressed 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

Here’s what I think investors in Nvidia stock can look forward to in 2026

Nvidia stock has delivered solid returns for investors in 2025. But it could head even higher in 2026, driven by…

Read more »

Investing Articles

Here are my top US stocks to consider buying in 2026

The US remains the most popular market for investors looking for stocks to buy. In a crowded market, where does…

Read more »

Investing Articles

£20,000 in excess savings? Here’s how to try and turn that into a second income in 2026

Stephen Wright outlines an opportunity for investors with £20,000 in excess cash to target a £1,450 a year second income…

Read more »

DIVIDEND YIELD text written on a notebook with chart
Investing Articles

Is a 9% yield from one of the UK’s most reliable dividend shares too good to be true?

Taylor Wimpey’s recent dividend record has been outstanding, but investors thinking of buying shares need to take a careful look…

Read more »

Snowing on Jubilee Gardens in London at dusk
Value Shares

Is it time to consider buying this FTSE 250 Christmas turkey?

With its share price falling by more than half since December 2024, James Beard considers the prospects for the worst-performing…

Read more »

A young black man makes the symbol of a peace sign with two fingers
Investing Articles

2 FTSE shares experts think will smash the market in 2026!

Discover some of the best-performing FTSE shares of 2025, and which ones expert analysts think will outperform in 2026 and…

Read more »

Close-up image depicting a woman in her 70s taking British bank notes from her colourful leather wallet.
Investing Articles

Every pound I invested in this FTSE 100 growth stock last year is now worth £3

Mark Hartley is astounded by the growth of one under-the-radar FTSE stock that’s up 200%. But looking ahead, he has…

Read more »

Tabletop model of a bear sat on desk in front of monitors showing stock charts
Investing Articles

Is the S&P 500 heading for a stock market crash?

The S&P 500's surged by double digits yet again in 2025, but can this momentum continue in 2026, or are…

Read more »