4 U.S. Stocks With Double Digit Gross Margin Expansion

Gross margins are the first level of profitability analysis for a company, and it is almost always the most important. Gross margins represent the markup that a company has implemented on its products over its costs, and it's usually a good representation of overall profitability potential within an industry. That being said, the companies on our list today have displayed a double-digit increase in gross margins over the last two years of operations.

Tesla Motors Inc. TSLA - $237.37

Auto & Truck Manufacturers Tesla Motors, Inc. designs, develops, manufactures and sells electric vehicles, electric vehicle powertrain components and stationary energy storage systems. The Company also designs, develops, manufactures and sells electric vehicle powertrain components to other automotive manufacturers. Its products include Model S and The Tesla Roadster. The Company uses energy management technologies and manufacturing processes developed for its vehicle powertrain systems and develops stationary energy storage products for use in homes, commercial sites and utilities.

• Market Cap: $30,659,057,328
• Improvement in Gross Margins (2 year, net): 20.3%
• Revenue (2014): $3,198,356,000
• Gross Margin (2014): 27.6%

Priceline Group Inc. PCLN - $1,305.47

Leisure & Recreation The Priceline Group Inc. is a provider of online travel and travel related reservation and search services. The Company, through its online travel agent (OTA) services, connects consumers wishing to make travel reservations with providers of travel services across the world. The Company's brands include Booking.com, KAYAK, agoda.com, rentalcars.com and OpenTable. Priceline offers consumers accommodation reservations, including hotels, bed and breakfasts, hostels, apartments, vacation rentals and other properties, through its Booking.com, priceline.com and agoda.com brands.

• Market Cap: $67,116,233,734
• Improvement in Gross Margins (2 year, net): 12.2%
• Revenue (2014): $8,441,971,000
• Gross Margin (2014): 89.8%

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