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.

Here’s my golden rule when investing in penny stocks and 1 risky pick I like now

Ben McPoland outlines his thinking on investing in penny stocks and picks out one he likes despite it dropping nearly 20% in a month.

| More on:
British Pennies on a Pound Note

Image source: Getty Images

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.

I’m always on the hunt for high-quality growth and dividend shares to build out my wealth. My fishing pond is primarily the main FTSE index, where the larger and more established companies reside. In addition to this, though, I do like to snag the odd penny stock for the riskier side of my portfolio.

However, I have a rule for investing in these market-cap minnows, which I’ll get to shortly.

XXX

Why are they risky?

Firstly, it’s important to understand what people mean when they talk about penny stocks, as well as the positives and negatives of investing in them.

Penny stocks, sometimes referred to as penny shares, trade with a share price below £1. And these small firms also have a market cap below £100m.

Due to their small size, many are unprofitable and a fair few are even pre-revenue (they have nothing to sell yet). Without much money to invest in research and development and new products, most never leave the penny stock arena. So they generally offer a higher level of risk.

Unfortunately, due to the low float of shares, they’re also prone to pump-and-dump schemes. These are when someone buys a large amount of stock and hypes it up, before selling it for a profit after other investors have piled in and pushed up the price.

This year, RC365 displayed all the hallmarks of this hype cycle. The stock chart says it all.

My rule for investing

Given the risks then, my golden rule is a pretty simple one. I never invest more than 0.5% of the value of my portfolio in a single penny stock, no matter how much I like it.

So if I had a £100k portfolio, I’d only put a maximum of £500 into a penny share. And I never have more than a handful in my portfolio at any one time.

An example of a big winner

Having said all that, they can also offer a higher potential reward.

Ashtead, for example, was a penny stock 20 years ago. Now, it’s a £20bn FTSE 100 firm and the second largest equipment rental specialist in North America.

Obviously, Ashtead is a very rare case. But it does show what is possible.

So, which penny stock do I like the look of right now?

The risky pick

At 39p per share, I’m bullish on the long-term potential of SRT Marine Systems (LSE: SRT). This is a £76m market cap firm that sells technology to helps vessels and waterway authorities so they can understand what is happening.

Now, the risk has been heightened here because the firm recently reiterated that results would be heavily weighted to the second half of FY 2024. Investors were spooked by this and sold off the stock. If H2 comes in light, it could fall further.

Yet I think this presents an opportunity. The company is a global leader in martine surveillance, which is a growth area due to the global adoption of the automatic identification system (AIS). Like air traffic control, this is a tracking system that transmits a ship’s position, identity, course, and speed.

Meanwhile, the shares look cheap on a forward P/E ratio of just 10. That could prove to be a very lucrative entry point, and I’m considering adding it to my holding.

Ben McPoland has positions in Ashtead Group Plc and Srt Marine Systems 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

Friends and sisters exploring the outdoors together in Cornwall. They are standing with their arms around each other at the coast.
Investing Articles

£503 buys 14 shares in this FTSE 250 stock that returned 23.9% annually for the last 15 years

This FTSE 250 stock has averaged a huge return for 15 years. At today's price, £503 buys 14 shares. But…

Read more »

Black woman using loudspeaker to be heard
Investing Articles

£1,000 buys 25 shares in this FTSE 100 stock that’s returned 29.2% annually for the last 10 years

This FTSE 100 mining stock has returned close to 30% a year for a decade. At 3,995p, £1,000 buys 25…

Read more »

Female student sitting at the steps and using laptop
Investing Articles

Down 47%, is this growth stock finally worth buying in May?

With a £288m order book and a hidden pipeline of defence and nuclear contracts, is this growth stock now too…

Read more »

House models and one with REIT - standing for real estate investment trust - written on it.
Investing Articles

2 REITs yielding 7%+ to consider for passive income in 2026

A REIT backed by the NHS and another backed by Tesco and Sainsbury's with both yielding 7%+. Here's why I'm…

Read more »

Woman riding her old fashioned bicycle along the Beach Esplanade at Aberdeen, Scotland.
Investing Articles

Just 97 shares of this UK dividend stock generate £238 in passive income

A 5.7% yield, £238 in passive income from just 97 shares, and one of the most divisive dividend stocks on…

Read more »

ISA coins
Investing Articles

£10,000 in an ISA generates a second income of…

The London Stock Exchange is home to some of the world's most generous dividends. But how big a second income…

Read more »

Shot of a senior man drinking coffee and looking thoughtfully out of a window
Investing Articles

Expert recommendations: 2 top income stocks yielding 7%+!

With yields of 7.2% and 7.8% respectively, these two income stocks are catching the eyes of institutional analysts. Should investors…

Read more »

Illustration of flames over a black background
Investing Articles

3 top income-focused stocks to buy in May 2026, according to experts

Looking for a stock to buy for income in May 2026? Experts have flagged these three UK dividend shares as…

Read more »