In order to justify the effort of selecting individual stocks, it's worth striving to beat the returns from a market index fund. But even the best stock picker will only win with some selections. At this point some shareholders may be questioning their investment in Ambac Financial Group, Inc. (NYSE:AMBC), since the last five years saw the share price fall 23%. On top of that, the share price is down 8.5% in the last week.

After losing 8.5% this past week, it's worth investigating the company's fundamentals to see what we can infer from past performance.

While the efficient markets hypothesis continues to be taught by some, it has been proven that markets are over-reactive dynamic systems, and investors are not always rational. 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.

Ambac Financial Group became profitable within the last five years. That would generally be considered a positive, so we are surprised to see the share price is down. Other metrics might give us a better handle on how its value is changing over time.

Arguably, the revenue drop of 7.8% a year for half a decade suggests that the company can't grow in the long term. That could explain the weak share price.

The company's revenue and earnings (over time) are depicted in the image below (click to see the exact numbers).

We know that Ambac Financial Group has improved its bottom line over the last three years, but what does the future have in store? You can see how its balance sheet has strengthened (or weakened) over time in this free interactive graphic.

A Different Perspective

Investors in Ambac Financial Group had a tough year, with a total loss of 8.5%, 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. Unfortunately, last year's performance may indicate unresolved challenges, given that it was worse than the annualised loss of 4% over the last half decade. 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. 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. For instance, we've identified 3 warning signs for Ambac Financial Group (2 shouldn't be ignored) that you should be aware of.

For those who like to find winning investments 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 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.