If you are building a properly diversified stock portfolio, the chances are some of your picks will perform badly. But long term Dollar Tree, Inc. (NASDAQ:DLTR) shareholders have had a particularly rough ride in the last three year. So they might be feeling emotional about the 53% share price collapse, in that time. And the ride hasn't got any smoother in recent times over the last year, with the price 43% lower in that time. The falls have accelerated recently, with the share price down 32% in the last three months.

While the stock has risen 3.4% in the past week but long term shareholders are still in the red, let's see what the fundamentals can tell us.

In his essay The Superinvestors of Graham-and-Doddsville Warren Buffett described how share prices do not always rationally reflect the value of a business. One way to examine how market sentiment has changed over time is to look at the interaction between a company's share price and its earnings per share (EPS).

Over the three years that the share price declined, Dollar Tree's earnings per share (EPS) dropped significantly, falling to a loss. Extraordinary items contributed to this situation. Since the company has fallen to a loss making position, it's hard to compare the change in EPS with the share price change. However, we can say we'd expect to see a falling share price in this scenario.

You can see how EPS has changed over time in the image below (click on the chart to see the exact values).

It's good to see that there was some significant insider buying in the last three months. That's a positive. On the other hand, we think the revenue and earnings trends are much more meaningful measures of the business. Dive deeper into the earnings by checking this interactive graph of Dollar Tree's earnings, revenue and cash flow.

A Different Perspective

Dollar Tree shareholders are down 43% for the year, but the market itself is up 34%. Even the share prices of good stocks drop sometimes, but we want to see improvements in the fundamental metrics of a business, before getting too interested. Regrettably, last year's performance caps off a bad run, with the shareholders facing a total loss of 5% per year over five years. We realise that Baron Rothschild has said investors should "buy when there is blood on the streets", but we caution that investors should first be sure they are buying a high quality business. I find it very interesting to look at share price over the long term as a proxy for business performance. But to truly gain insight, we need to consider other information, too. Even so, be aware that Dollar Tree is showing 1 warning sign in our investment analysis , you should know about...

Dollar Tree is not the only stock insiders are buying. So take a peek at this free list of small cap companies at attractive valuations which insiders have been buying.

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

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.