SDI Group (LON:SDI) sheds UK£7.3m, company earnings and investor returns have been trending downwards for past three years

The truth is that if you invest for long enough, you're going to end up with some losing stocks. But the last three years have been particularly tough on longer term SDI Group plc (LON:SDI) shareholders. So they might be feeling emotional about the 63% share price collapse, in that time. And over the last year the share price fell 23%, so we doubt many shareholders are delighted. On top of that, the share price is down 11% in the last week.

After losing 11% this past week, it's worth investigating the company's fundamentals to see what we can infer from past performance.

Check out our latest analysis for SDI Group

While markets are a powerful pricing mechanism, share prices reflect investor sentiment, not just underlying business performance. By comparing earnings per share (EPS) and share price changes over time, we can get a feel for how investor attitudes to a company have morphed over time.

SDI Group saw its EPS decline at a compound rate of 20% per year, over the last three years. The share price decline of 28% is actually steeper than the EPS slippage. So it's likely that the EPS decline has disappointed the market, leaving investors hesitant to buy.

The image below shows how EPS has tracked over time (if you click on the image you can see greater detail).

We know that SDI Group has improved its bottom line lately, but is it going to grow revenue? Check if analysts think SDI Group will grow revenue in the future.

A Different Perspective

SDI Group shareholders are down 23% for the year, but the market itself is up 14%. However, keep in mind that even the best stocks will sometimes underperform the market over a twelve month period. Longer term investors wouldn't be so upset, since they would have made 5%, each year, over five years. If the fundamental data continues to indicate long term sustainable growth, the current sell-off could be an opportunity worth considering. It's always interesting to track share price performance over the longer term. But to understand SDI Group better, we need to consider many other factors. Consider for instance, the ever-present spectre of investment risk. We've identified 1 warning sign with SDI Group , and understanding them should be part of your investment process.

But note: SDI Group may not be the best stock to buy. So take a peek at this free list of interesting companies with past earnings growth (and further growth forecast).

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

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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.