This week, these ten stocks, all currently earning A’s (“strong buy”) on Portfolio Grader, have the best year-to-date performance. Since the beginning of the year, the Nasdaq increased, the Dow is up 13.2%, and the S&P is up 12.1%.

Since January 1, CoStar Group, Inc. (NASDAQ:CSGP) has jumped 95.6%. CoStar Group provides information and analytic services to the commercial real estate industry in the United States, the United Kingdom, and France. For more information, get Portfolio Grader’s complete analysis of CSGP stock.

Lithia Motors, Inc. Class A (NYSE:LAD) has risen 97.6% since the first of the year. Lithia Motors retail sells new and used vehicles in the western United States. For more information, get Portfolio Grader’s complete analysis of LAD stock.

Since the first of the year, the price of Santarus, Inc. (NASDAQ:SNTS) has swelled 100%. Santarus is a specialty pharmaceutical company focused on acquiring, developing and commercializing proprietary products that address the needs of patients treated by gastroenterologists and other targeted physicians. For more information, get Portfolio Grader’s complete analysis of SNTS stock.

Since January 1, Lumber Liquidators Holdings, Inc. (NYSE:LL) has climbed 108%. Lumber Liquidators retails hardwood flooring in the United States. For more information, get Portfolio Grader’s complete analysis of LL stock.

Since January 1, FleetCor Technologies, Inc. (NYSE:FLT) has shot up 110.9%. FleetCor Technologies is an independent global provider of specialized payment products and services to commercial fleets, major oil companies and petroleum marketers. The volume of trades has grown significantly in the past week, up 127.2%. For more information, get Portfolio Grader’s complete analysis of FLT stock.

Shares of Linkedin Corporation Class A (NYSE:LNKD) have risen 114.7% since January 1. LinkedIn operates a social networking website used for professional networking. Trade volume rose notably over the past week, up 426.1%. For more information, get Portfolio Grader’s complete analysis of LNKD stock.

Since January 1, the price of Multimedia Games Holding Company, Inc. (NASDAQ:MGAM) has grown 128.2%. Multimedia Games designs, manufactures and supplies stand alone and networked gaming systems. Trade volume has increased significantly over the past week, up 130.3%. For more information, get Portfolio Grader’s complete analysis of MGAM stock.

Shares of Lions Gate Entertainment (NYSE:LGF) have leapt 131.2% since January 1. Lions Gate Entertainment develops, produces, and distributes filmed entertainment content. For more information, get Portfolio Grader’s complete analysis of LGF stock.

Since the first of the year, shares of Pharmacyclics, Inc. (NASDAQ:PCYC) have soared 131.9%. Pharmacyclics is a pharmaceutical company developing products to improve upon current therapeutic approaches to cancer, atherosclerosis, and retinal disease. For more information, get Portfolio Grader’s complete analysis of PCYC stock.

The price of Himax Technologies, Inc. Sponsored ADR (NASDAQ:HIMX) is up 354.2% since the first of the year. Himax Technologies designs and manufactures integrated circuits. For more information, get Portfolio Grader’s complete analysis of HIMX stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.