This week, 3 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”).

TransDigm Group Incorporated (TDG) is seeing ratings go up from a B last week to a A this week. 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 and earnings momentum. For more information, get Portfolio Grader’s complete analysis of TDG stock.

Honeywell International Inc. (HON) earns a B this week, jumping up from last week’s grade of C. Honeywell International Inc. is a worldwide diversified technology and manufacturing company providing aerospace products and services, control, sensing and security technologies, turbochargers, automotive products, specialty chemicals, electronic and advanced materials, process technology for refining and petrochemicals, and energy efficient products and solutions. The company also gets A’s in return on equity. For more information, get Portfolio Grader’s complete analysis of HON stock.

Orbital ATK, Inc. (OA) boosts its rating from a B to a A this week. The company also gets A’s in sales growth and earnings surprise. For more information, get Portfolio Grader’s complete analysis of OA 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.