The grades of three aerospace and defense stocks are better this week, according to the Portfolio Grader database. Every one of these stocks has an “A” (“strong buy”) or “B” overall (“buy”) rating.

Astronics Corporation (ATRO) is bumping up its rating from a C (“hold”) to a B (“buy”) this week. Astronics is a supplier of products to the aerospace and defense industries. In Portfolio Grader’s specific subcategories of Earnings Growth, Earnings Revisions, Earnings Surprise, Equity and Sales Growth, ATRO also gets A’s. Shares of the stock have been trading at an exceptionally rapid pace, up twofold from the week prior. For more information, get Portfolio Grader’s complete analysis of ATRO stock.

This week, Northrop Grumman Corporation (NOC) is making solid headway. The company’s rating improves to an A (“strong buy”) from last week’s B (“buy”) rating. Northrop Grumman provides systems, products, and solutions in aerospace, electronics, information systems, shipbuilding and technical services to government and commercial customers worldwide. For more information, get Portfolio Grader’s complete analysis of NOC stock.

Aerojet Rocketdyne Holdings, Inc. (AJRD) boosts its rating from a C to a B this week. For more information, get Portfolio Grader’s complete analysis of AJRD 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.