We think intelligent long term investing is the way to go. But that doesn't mean long term investors can avoid big losses. Zooming in on an example, the Pediatrix Medical Group, Inc. (NYSE:MD) share price dropped 66% in the last half decade. That's not a lot of fun for true believers. And some of the more recent buyers are probably worried, too, with the stock falling 38% in the last year. And the share price decline continued over the last week, dropping some 6.8%.

Given the past week has been tough on shareholders, let's investigate the fundamentals and see what we can learn.

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 imperfect but simple way to consider how the market perception of a company has shifted is to compare the change in the earnings per share (EPS) with the share price movement.

Pediatrix Medical Group became profitable within the last five years. However, it made a loss in the last twelve months, suggesting profit may be an unreliable metric at this stage. Other metrics may better explain the share price move.

The revenue decline of 2.6% isn't too bad. But it's quite possible the market had expected better; a closer look at the revenue trends might explain the pessimism.

The image below shows how earnings and revenue have tracked over time (if you click on the image you can see greater detail).

You can see how its balance sheet has strengthened (or weakened) over time in this free interactive graphic.

A Different Perspective

Investors in Pediatrix Medical Group had a tough year, with a total loss of 38%, against a market gain of about 29%. 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 11% per year over five years. Generally speaking long term share price weakness can be a bad sign, though contrarian investors might want to research the stock in hope of a turnaround. 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. To that end, you should be aware of the 1 warning sign we've spotted with Pediatrix Medical Group .

But note: Pediatrix Medical 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 American 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.