Anyone researching Silicon Motion Technology Corporation (NASDAQ:SIMO) might want to consider the historical volatility of the share price. Modern finance theory considers volatility to be a measure of risk, and there are two main types of price volatility. The first type is company specific volatility. Investors use diversification across uncorrelated stocks to reduce this kind of price volatility across the portfolio. The second sort is caused by the natural volatility of markets, overall. For example, certain macroeconomic events will impact (virtually) all stocks on the market.

Some stocks mimic the volatility of the market quite closely, while others demonstrate muted, exagerrated or uncorrelated price movements. Beta can be a useful tool to understand how much a stock is influenced by market risk (volatility). However, Warren Buffett said 'volatility is far from synonymous with risk' in his 2014 letter to investors. So, while useful, beta is not the only metric to consider. To use beta as an investor, you must first understand that the overall market has a beta of one. A stock with a beta greater than one is more sensitive to broader market movements than a stock with a beta of less than one.

Check out our latest analysis for Silicon Motion Technology

What we can learn from SIMO's beta value

Silicon Motion Technology has a five-year beta of 1.08. This is reasonably close to the market beta of 1, so the stock has in the past displayed similar levels of volatility to the overall market. While history does not always repeat, this may indicate that the stock price will continue to be exposed to market risk, albeit not overly so. Share price volatility is well worth considering, but most long term investors consider the history of revenue and earnings growth to be more important. Take a look at how Silicon Motion Technology fares in that regard, below.

How does SIMO's size impact its beta?

Silicon Motion Technology is a small company, but not tiny and little known. It has a market capitalisation of US$1.6b, which means it would be on the radar of intstitutional investors. It takes less capital to move the share price of small companies, and they are also more impacted by company specific events, so it's a bit of a surprise that the beta is so close to the overall market.

What this means for you:

Since Silicon Motion Technology has a beta close to one, it will probably show a positive return when the market is moving up, based on history. If you're trying to generate better returns than the market, it would be worth thinking about other metrics such as cashflows, dividends and revenue growth might be a more useful guide to the future. This article aims to educate investors about beta values, but it's well worth looking at important company-specific fundamentals such as Silicon Motion Technology’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 SIMO’s future growth? Take a look at our free research report of analyst consensus for SIMO’s outlook.

2. Past Track Record: Has SIMO 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 SIMO's historicals for more clarity.

3. Other Interesting Stocks: It's worth checking to see how SIMO 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.