This week, these five stocks have the best ratings in Earnings Surprises, one of the eight Fundamental Categories on Portfolio Grader.

AG Mortgage Investment Trust Inc. (NYSE: MITT) focuses on investing, acquiring, and managing a portfolio of residential mortgage assets, and other real estate-related securities and financial assets. MITT also gets A’s in Analyst Earnings Revisions, Equity, and Cash Flow. The stock has a dividend yield of 3.1%. Since January 1, the price of MITT increased 17.6%. This is better than the S&P 500’s 13.9% increase for the same period. For more information, get Portfolio Grader’s complete analysis of MITT stock.

Abiomed (NASDAQ: ABMD) provides medical devices in circulatory support and it offers a continuum of care in heart recovery to acute heart failure patients. ABMD also gets A’s in Analyst Earnings Revisions and Sales Growth. Shares of ABMD shot up 16.1% from the first of the year. For more information, get Portfolio Grader’s complete analysis of ABMD stock.

Markel Corp. (NYSE: MKL) markets and underwrites specialty insurance products and programs to a variety of niche markets. MKL also gets A’s in Earnings Growth, Earnings Momentum, and Analyst Earnings Revisions. Since the beggining of the year, MKL shares have risen 9.2%. For more information, get Portfolio Grader’s complete analysis of MKL stock.

Xinyuan Real Estate (NYSE: XIN) is involved in residential real estate development and providing property management services in China. XIN also gets A’s in Earnings Growth, Analyst Earnings Revisions, Cash Flow, and Sales Growth. The stock currently has a trailing PE Ratio of 1.3. Shares of the company are up 50.9% since January 1. For more information, get Portfolio Grader’s complete analysis of XIN stock.

Cray (NASDAQ: CRAY) designs, develops, manufactures, markets and services high performance computing systems, commonly known as supercomputers. CRAY also gets A’s in Earnings Momentum, Analyst Earnings Revisions, Equity, Cash Flow, Operating Margin Growth, and Sales Growth. Since January 1, CRAY has jumped 93.8%. The stock has a trailing PE Ratio of 2.7. For more information, get Portfolio Grader’s complete analysis of CRAY 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.