In order to justify the effort of selecting individual stocks, it's worth striving to beat the returns from a market index fund. But in any portfolio, there will be mixed results between individual stocks. 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 37%.

Although the past week has been more reassuring for shareholders, they're still in the red over the last five years, so let's see if the underlying business has been responsible for the decline.

Because Ambac Financial Group made a loss in the last twelve months, we think the market is probably more focussed on revenue and revenue growth, at least for now. Generally speaking, companies without profits are expected to grow revenue every year, and at a good clip. That's because fast revenue growth can be easily extrapolated to forecast profits, often of considerable size.

In the last half decade, Ambac Financial Group saw its revenue increase by 6.6% per year. That's a pretty good rate for a long time period. Shareholders have seen the share price fall at 7% per year, for five years: a poor performance. Those who bought back then clearly believed in stronger growth - and maybe even profits. There is always a big risk of losing money yourself when you buy shares in a company that loses money.

The graphic below depicts how earnings and revenue have changed over time (unveil 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. On the other hand, we think the revenue and earnings trends are much more meaningful measures of the business. So it makes a lot of sense to check out what analysts think Ambac Financial Group will earn in the future (free profit forecasts).

A Different Perspective

While the broader market gained around 35% in the last year, Ambac Financial Group shareholders lost 12%. 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 7% 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. For instance, we've identified 2 warning signs for Ambac Financial Group (1 shouldn't be ignored) that you should be aware of.

Ambac Financial Group 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.

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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.