This week, 4 Energy Equipment & Services stocks are improving their overall rating on Portfolio Grader. Each of these rates an “A” (“strong buy”) or “B” overall (“buy”).

Geospace Technologies Corporation (GEOS) gets a higher grade this week, advancing from a C last week to a B. Geospace Technologies Corporation designs and manufactures instruments and equipment used in the acquisition and processing of seismic data; and characterization and monitoring of producing oil and gas reservoirs. The company also gets A’s in earnings momentum. For more information, get Portfolio Grader’s complete analysis of GEOS stock.

Nabors Industries Ltd. (NBR) shows solid improvement this week. The company’s rating rises from a C to a B. Nabors Industries Ltd. conducts oil, gas, and geothermal land drilling operations worldwide. For more information, get Portfolio Grader’s complete analysis of NBR stock.

McDermott International, Inc. (MDR) boosts its rating from a C to a B this week. McDermott International, Inc. is a worldwide energy services company. The company also gets A’s in operating margin growth and earnings growth. For more information, get Portfolio Grader’s complete analysis of MDR stock.

The rating of Recon Technology Ltd. (RCON) moves up this week, rising from a C to a B. Recon Technology Ltd. is a holding company that provides services designed to automate the extraction of petroleum in China. The company also gets A’s in earnings momentum. For more information, get Portfolio Grader’s complete analysis of RCON 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.