This week, 4 Aerospace & Defense stocks are improving their overall ratings on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

This week, TransDigm Group Incorporated’s (TDG) ratings are up from a C last week to a B. TransDigm Group Incorporated is a global designer, producer and supplier of highly engineered aircraft components for use on nearly all commercial and military aircraft in service today. The company also gets A’s in operating margin growth. For more information, get Portfolio Grader’s complete analysis of TDG stock.

Huntington Ingalls Industries, Inc. (HII) earns a B this week, jumping up from last week’s grade of C. Huntington Ingalls Industries, Inc. designs, builds, and maintains nuclear and non-nuclear ships for the United States Navy and Coast Guard. The company also gets A’s in return on equity. For more information, get Portfolio Grader’s complete analysis of HII stock.

General Dynamics Corporation (GD) is seeing ratings go up from a C last week to a B this week. General Dynamics Corporation an aerospace and defense company, provides business aviation; combat vehicles, weapons systems, and munitions; military and commercial shipbuilding; and communications and information technology products and services worldwide. The company also gets A’s in return on equity. For more information, get Portfolio Grader’s complete analysis of GD stock.

HEICO Corporation (HEI) boosts its rating from a C to a B this week. HEICO Corporation designs, manufactures, and sells aerospace products and services. The company also gets A’s in earnings revisions and return on equity. For more information, get Portfolio Grader’s complete analysis of HEI 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.