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Since the start of the year, the dollar has been in a relentless downtrend. On Friday, the U.S. Dollar Index ($DXY), which measures the greenback against a basket of currencies, reached its lowest point since early 2015.

For some U.S. companies, the dollar's descent is good news. To understand why, it's important to recognize the relationship between the dollar and the euro -- when one goes up, the other goes down. As the dollar hits multiyear lows, the euro touches multiyear highs.

This relationship is demonstrated on the following chart, using the PowerShares U.S. Dollar Bull ETF (UUP) - Get Invesco DB US Dollar Index Bullish Fund Report (top) and the CurrencyShares Euro ETF (FXE) - Get Invesco CurrencyShares Euro Trust Report (bottom). Note how the two instruments have formed a virtual mirror image of one another over the past five years.

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Source: TradeStation

For a U.S.-based company with no sales in Europe, the above chart is meaningless. However, U.S. companies that have significant sales in Europe are about to reap the benefits of a weak dollar. Without raising prices, they are about to increase profits because euros are worth more now than they have been in years.

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Source: TradeStation

Which companies are best-positioned to benefit from weakness in the U.S. currency? Let's start with Johnson & Johnson (JNJ) - Get Johnson & Johnson Report . This consumer products giant generates over half of its sales from outside the U.S. With the dollar falling, look for J&J to continue to perform.

Procter & Gamble (PG) - Get Procter & Gamble Company Report is another consumer products name that belongs on this list. Remember how this stock was battered by a strong dollar just a few years ago? Now that the buck is falling, that trend should reverse.

A weak dollar should provide a tailwind to Boeing's (BA) - Get Boeing Company Report commercial aircraft division. That division competes chiefly with Europe's Airbus, a company which will be hurt by the stronger euro.

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No matter where you travel in this world, there's a chance you'll spot the familiar golden arches of McDonald's (MCD) - Get McDonald's Corporation Report , or the iconic Coca-Cola (KO) - Get Coca-Cola Company Report logo.

Only 40% of 3M's (MMM) - Get 3M Company Report business is generated in the U.S., so that stock stands to benefit. All around the world, construction workers use equipment made by Caterpillar (CAT) - Get Caterpillar Inc. Report .

How many companies can state that nearly one-quarter of the world's population buys its products? With sales in 175 countries, Kimberly-Clark (KMB) - Get Kimberly-Clark Corporation Report can, so they make the list.

Finally, in software, Microsoft (MSFT) - Get Microsoft Corporation Report and Oracle (ORCL) - Get Oracle Corporation Report obtain more than half of their sales from overseas. Microsoft gets 54% of sales from outside the U.S., while Oracle's figure is 55%.

Keep in mind that currency exchange rates are just one factor that can affect a stock's performance. Companies still need to execute in order to be successful. Overall market conditions will also factor into individual stock performance, regardless of exchange rates.

Ed Ponsi is a regular contributor to Real Money Pro. Click here to learn about this dynamic market information service for active traders.

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Editors' pick: Originally published Sept. 8.

At the time of publication, Ponsi was long JNJ, BA and MCD.