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# Is Your Stock on the Endangered List?

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To protect your capital, you need to know how to see warning signs of troubled businesses before they go off a cliff -- and take your portfolio with them. For years, experts have used one fairly simple measure to predict corporate bankruptcies -- and it's had a pretty good success rate.

Over 40 years ago, NYU business professor Edward Altman came up with a model for predicting what companies might fall into bankruptcy. Known as Altman's Z-score, the measure gives you a way to evaluate stocks that may be in danger of becoming insolvent.

Focusing on financials
The Z-score calculation depends entirely on figures you can obtain from a company's quarterly financial reports. The model takes into account five different variables that incorporate seven data points from company balance sheets and income statements:

• The ratio of working capital to total assets gives you a sense of how much liquidity a company has to run its daily operations.
• The ratio of retained earnings to total assets tells about the company's past earnings history and how much money a company has put back into its business.
• The ratio of operating earnings to total assets shows how profitable a company is, factoring out interest and taxes, which can mask long-term viability.
• The ratio of market capitalization to total liabilities describes how big a factor debt is within a company.
• The ratio of sales to total assets gives a sense of how quickly a business turns over the goods or services it produces from the capital it owns.

As you can see, with all of these components, the higher the ratio, the healthier the business. To calculate the Z-score, you take each ratio and multiply it by a factor as listed below:

Ratio

Multiplier

Working capital to total assets

1.2

Retained earnings to total assets

1.4

Operating earnings to total assets

3.3

Market cap to total liabilities

0.6

Sales to total assets

1.0

Add up each product and you have the Z-score. Commonly, a score below 1.8 is seen as indicating a strong danger of bankruptcy, while a score above 3 is considered relatively safe.

Far from perfect
The Z-score has performed well. One study indicated that the measure has a success rate of roughly 72%.

Still, that's far from 100%, so although it's a useful conceptual tool, you clearly can't rely on the Z-score as a perfect predictor. Over the years, plenty of businesses with dangerously low Z-scores have come back from the brink, producing extremely attractive performance. Look, for instance, at these companies that were in dire straits back in 2003, following the end of the tech bust:

Stock

Z-Score 2003

Current Z-Score

6-Year Average Annualized Return

Priceline.com (Nasdaq: PCLN  )

0.1

3.1

43.9%

Foster Wheeler (Nasdaq: FWLT  )

1.1

3.3

10.2%

Titanium Metals (NYSE: TIE  )

1.2

5.9

61.2%

Clean Harbors (NYSE: CLH  )

1.2

3.7

26.5%

Fuel Systems Solutions
(Nasdaq: FSYS  )

1.5

4.3

25%

Terra Industries (NYSE: TRA  )

1.3

3.9

57.9%

ABB (NYSE: ABB  )

1.2

3.2

39.5%

Source: Capital IQ, a division of Standard and Poor's.

Investors clearly believe the Z-score works, because shares tend to fall to very low levels when Z-scores are low. For those companies that survive, though, those low prices mean big gains for investors who stay the course.

Avoiding the gamble
Despite the fact that the Z-score isn't perfect, many investors feel far more comfortable steering clear of any sign of potential bankruptcy. And while this method won't pick up bankruptcies caused by factors other than those that show up on the balance sheet -- factors like unexpected business disruptions -- it's worth adding to your toolbox of ways to size up your prospective investments.

For more on investing in a tough market:

If you like great bargains with a margin of safety against bankruptcy, you'll love our Motley Fool Inside Value newsletter. Each month, we uncover new stock recommendations that are trading well below their true value. Take a look for yourself with the ultimate bargain -- a free 30-day trial.

Fool contributor Dan Caplinger hasn't gotten snared by a bankruptcy yet, though he's come close a couple times. He doesn't own shares of the companies mentioned in this article. ABB is a Motley Fool Global Gains selection. Titanium Metals and Priceline.com are Motley Fool Stock Advisor recommendations. Try any of our Foolish newsletters today, free for 30 days. The Fool's disclosure policy won't fail on you.

Help us keep this a respectfully Foolish area! This is a place for our readers to discuss, debate, and learn more about the Foolish investing topic you read about above. Help us keep it clean and safe. If you believe a comment is abusive or otherwise violates our Fool's Rules, please report it via the Report this Comment icon found on every comment.

• ###### Report this Comment On March 04, 2009, at 6:56 AM, emilysuchos wrote:

I am interested in this measure, and I am searching for UK and US companies zscores,

Can somebody send me a list of companie and their zscores.

Thank you for help.

• ###### Report this Comment On June 18, 2009, at 6:57 PM, thisislabor wrote:

Interesting article, thankyou for posting.

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Dan Caplinger
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Dan Caplinger has been a contract writer for the Motley Fool since 2006. As the Fool's Director of Investment Planning, Dan oversees much of the personal-finance and investment-planning content published daily on Fool.com. With a background as an estate-planning attorney and independent financial consultant, Dan's articles are based on more than 20 years of experience from all angles of the financial world.

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