Shareholders in DiaSorin (BIT:DIA) are in the red if they invested three years ago

In order to justify the effort of selecting individual stocks, it's worth striving to beat the returns from a market index fund. But the risk of stock picking is that you will likely buy under-performing companies. We regret to report that long term DiaSorin S.p.A. (BIT:DIA) shareholders have had that experience, with the share price dropping 49% in three years, versus a market decline of about 24%.

Since shareholders are down over the longer term, lets look at the underlying fundamentals over the that time and see if they've been consistent with returns.

See our latest analysis for DiaSorin

To quote Buffett, 'Ships will sail around the world but the Flat Earth Society will flourish. There will continue to be wide discrepancies between price and value in the marketplace...' One flawed but reasonable way to assess how sentiment around a company has changed is to compare the earnings per share (EPS) with the share price.

DiaSorin saw its EPS decline at a compound rate of 17% per year, over the last three years. This change in EPS is reasonably close to the 20% average annual decrease in the share price. So it seems like sentiment towards the stock hasn't changed all that much over time. In this case, it seems that the EPS is guiding the share price.

You can see below how EPS has changed over time (discover the exact values by clicking on the image).

It's good to see that there was some significant insider buying in the last three months. That's a positive. That said, we think earnings and revenue growth trends are even more important factors to consider. It might be well worthwhile taking a look at our free report on DiaSorin's earnings, revenue and cash flow.

A Different Perspective

DiaSorin provided a TSR of 14% over the last twelve months. But that was short of the market average. On the bright side, that's still a gain, and it's actually better than the average return of 0.7% over half a decade It is possible that returns will improve along with the business fundamentals. While it is well worth considering the different impacts that market conditions can have on the share price, there are other factors that are even more important. To that end, you should be aware of the 2 warning signs we've spotted with DiaSorin .

DiaSorin is not the only stock that insiders are buying. For those who like to find lesser know companies this free list of growing companies with recent insider purchasing, could be just the ticket.

Please note, the market returns quoted in this article reflect the market weighted average returns of stocks that currently trade on Italian exchanges.

Have feedback on this article? Concerned about the content? Get in touch with us directly. Alternatively, email editorial-team (at) simplywallst.com.

This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.