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

Callon Petroleum Company (CPE) engages in the acquisition, exploration, development, and production of crude oil and natural gas properties. The company also gets A’s in earnings revisions and earnings surprise. For more information, get Portfolio Grader’s complete analysis of CPE stock.

Hardinge Inc. (HDNG) globally designs, manufactures and distributes computer controlled metal cutting lathes, grinding and related tooling and accessories. The company also gets A’s in earnings revisions, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of HDNG stock.

CNinsure, Inc. Sponsored ADR (CISG) is an independent insurance intermediary company that operates in China. The company also gets A’s in sales growth and earnings revisions. For more information, get Portfolio Grader’s complete analysis of CISG stock.

Pampa Energia SA Sponsored ADR (PAM) is a fully integrated electricity company in Argentina. The company also gets A’s in earnings revisions. For more information, get Portfolio Grader’s complete analysis of PAM stock.

Calpine Corporation (CPN) is an independent wholesale power generation company engaged in the ownership and operation of natural gas-fired and geothermal power plants in North America. The company also gets A’s in operating margin growth and earnings revisions. For more information, get Portfolio Grader’s complete analysis of CPN 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.