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Anyone researching Nexstim Plc (HEL:NXTMH) might want to consider the historical volatility of the share price. Volatility is considered to be a measure of risk in modern finance theory. Investors may think of volatility as falling into two main categories. The first category is company specific volatility. This can be dealt with by limiting your exposure to any particular stock. The other type, which cannot be diversified away, is the volatility of the entire market. Every stock in the market is exposed to this volatility, which is linked to the fact that stocks prices are correlated in an efficient market.

Some stocks mimic the volatility of the market quite closely, while others demonstrate muted, exagerrated or uncorrelated price movements. Some investors use beta as a measure of how much a certain stock is impacted by market risk (volatility). While we should keep in mind that Warren Buffett has cautioned that 'Volatility is far from synonymous with risk', beta is still a useful factor to consider. To make good use of it you must first know that the beta of the overall market is one. Any stock with a beta of greater than one is considered more volatile than the market, while those with a beta below one are either less volatile or poorly correlated with the market.

See our latest analysis for Nexstim

What does NXTMH's beta value mean to investors?

Looking at the last five years, Nexstim has a beta of 0.88. The fact that this is well below 1 indicates that its share price movements haven't historically been very sensitive to overall market volatility. If history is a good guide, owning the stock should help ensure that your portfolio is not overly sensitive to market volatility. Many would argue that beta is useful in position sizing, but fundamental metrics such as revenue and earnings are more important overall. You can see Nexstim's revenue and earnings in the image below.

Does NXTMH's size influence the expected beta?

Nexstim is a noticeably small company, with a market capitalisation of €4.2m. Most companies this size are not always actively traded. It is not unusual for very small companies to have a low beta value, especially if only low volumes of shares are traded. Even when they are traded more actively, the share price is often more susceptible to company specific developments than overall market volatility.

What this means for you:

Since Nexstim is not heavily influenced by market moves, its share price is probably far more dependend on company specific developments. It could pay to take a closer look at metrics such as revenue growth, earnings growth, and debt. This article aims to educate investors about beta values, but it's well worth looking at important company-specific fundamentals such as Nexstim’s financial health and performance track record. I urge you to continue your research by taking a look at the following:

1. Future Outlook: What are well-informed industry analysts predicting for NXTMH’s future growth? Take a look at our free research report of analyst consensus for NXTMH’s outlook.

2. Past Track Record: Has NXTMH been consistently performing well irrespective of the ups and downs in the market? Go into more detail in the past performance analysis and take a look at the free visual representations of NXTMH's historicals for more clarity.

3. Other Interesting Stocks: It's worth checking to see how NXTMH measures up against other companies on valuation. You could start with this free list of prospective options.

We aim to bring you long-term focused research analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material.

If you spot an error that warrants correction, please contact the editor at editorial-team@simplywallst.com. This article by Simply Wall St is general in nature. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. Simply Wall St has no position in the stocks mentioned. Thank you for reading.