This week, four aerospace and defense stocks are improving their overall ratings on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

DigitalGlobe, Inc. (DGI) is bettering its rating of C (“hold”) from last week to a B (“buy”) this week. DigitalGlobe provides commercial earth imagery products and information services worldwide. In Portfolio Grader’s specific subcategory of Sales Growth, DGI also gets an A. For more information, get Portfolio Grader’s complete analysis of DGI stock.

TASER International, Inc. (TASR) is making headway this week, with the company’s rating improving to an A (“strong buy”) from a B (“buy”) last week. Taser International develops, assembles, and markets less-lethal weapons for use in the law enforcement, private security, and personal defense markets. Shares of the stock have been changing hands at an unusually rapid pace, twice the rate of the week prior. For more information, get Portfolio Grader’s complete analysis of TASR stock.

AeroVironment, Inc. (AVAV) boosts its rating from a C to a B this week. AeroVironment designs, tests, and manufactures diversified technological products, including small, unmanned, remote-control military aircraft and rapid battery-charging stations. For more information, get Portfolio Grader’s complete analysis of AVAV stock.

CAE Inc. (CAE) shows solid improvement this week. The company’s rating rises from a C to a B. CAE is engaged in the design, development and production of simulation tools and equipment for commercial airlines, business aircraft operators, aircraft manufacturers and military organizations. For more information, get Portfolio Grader’s complete analysis of CAE 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.