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

Elbit Systems Ltd’s (ESLT) grade is moving up to a B (“buy”) this week from last week’s C (“hold”). Elbit Systems engages in the design, development, manufacture, and integration of defense systems and products worldwide. In Portfolio Grader’s specific subcategory of Cash Flow, ESLT also gets an A. For more information, get Portfolio Grader’s complete analysis of ESLT stock.

This week, Orbital Sciences Corporation (ORB) pushes up from a C to a B rating. Orbital Sciences manufactures small space systems for commercial, civil government, and military customers. For more information, get Portfolio Grader’s complete analysis of ORB stock.

This week, Lockheed Martin Corporation (LMT) is making solid headway. The company’s rating improves to an A (“strong buy”) from last week’s B (“buy”) rating. Lockheed Martin is a global security company that primarily researches, designs, develops, manufactures, and integrates advanced technology products and services. The current dividend yield is 6%. For more information, get Portfolio Grader’s complete analysis of LMT stock.

Moog Inc. Class A (MOG.A) boosts its rating from a C to a B this week. Moog manufactures precision motion control components and systems. For more information, get Portfolio Grader’s complete analysis of MOG.A 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.