In the quest to find great investments, most investors focus on earnings to gauge a company's financial strength. This is a good start, but earnings can be misleading and incomplete. To get a clearer understanding of a company's ability to earn money and reward you, the shareholder, it's often better to focus on cash flow. In this series, we tear apart a company's cash flow statement to see how much money is truly being earned and, more importantly, what management is doing with that cash.

Step on up, Northern Trust (Nasdaq: NTRS).

The first step in analyzing cash flow is to look at net income. Northern Trust's net income over the last five years has been impressive:

 

2011

2010

2009

2008

2007

Normalized Net Income $635 million $598 million $786 million $773 million $757 million

Source: S&P Capital IQ.

Next, we add back in a few non-cash expenses, like the depreciation of assets, and adjust net income for changes in inventory, accounts receivable, and accounts payable -- changes in cash levels that reflect a company either paying its bills, or being paid by customers. This yields a figure called "cash from operating activities" -- the amount of cash a company generates from doing everyday business.

From there, we subtract capital expenditures, or the amount a company spends acquiring or fixing physical assets. This yields one version of a figure called "free cash flow," or the true amount of cash a company has left over for its investors after doing business:

 

2011

2010

2009

2008

2007

Free Cash Flow

$1.2 billion

$700 million

$882 million

$753 million

$791 million

Source: S&P Capital IQ.

Now we know how much cash Northern Trust is really pulling in each year. Next question: What is it doing with that cash?

There are two ways a company can use free cash flow to directly reward shareholders: dividends and share repurchases. Cash not returned to shareholders can be stashed in the bank, invested in other companies and assets, or used to pay off debt.

Here's how much Northern Trust has returned to shareholders in recent years:

 

2011

2010

2009

2008

2007

Dividends $274 million $273 million $307 million $248 million $220 million
Share Repurchases $79 million $6 million $11 million $68 million $213 million
Total Returned to Shareholders $353 million $279 million $318 million $316 million $433 million

Source: S&P Capital IQ.

As you can see, the company has repurchased a decent amount of its own stock. But combined with other rounds of share issuance, shares outstanding have actually increased:

 

2011

2010

2009

2008

2007

Shares Outstanding (millions) 241 242 236 221 220

Source: S&P Capital IQ.

Now, companies tend to be fairly poor at repurchasing their own shares, buying feverishly when shares are expensive and backing away when they're cheap. Does Northern Trust fall into this trap? Let's take a look:

Source: S&P Capital IQ.

Not impressive. Most of Northern Trust's buybacks over the last five years came when shares were at their high mark. Buybacks have crept back in more recent months as shares continued to fall -- that's encouraging -- but in general management doesn't appear to be the most astute buyer of its own stock.

Finally, I like to look at how dividends have added to total shareholder returns:

Source: S&P Capital IQ.

Shares returned -10% over the last five years, which drops to -19% without dividends -- a nice boost to top off otherwise poor performance.

To gauge how well a company is doing, keep an eye on the cash. How much a company earns is not as important as how much cash is actually coming in the door, and how much cash is coming in the door isn't as important as what management actually does with that cash. Remember, you, the shareholder, own the company. Are you happy with the way management has used Northern Trust's cash? Sound off in the comment section below.

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