This week, these five stocks have the best ratings in Operating Margin, one of the eight Fundamental Categories on Portfolio Grader.

Photronics, Inc. (PLAB) manufactures photomasks, which are high precision quartz plates that contain microscopic images of electronic circuits. The company also gets A’s in operating margin growth, earnings growth, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of PLAB stock.

Microsemi Corporation (MSCC) designs, manufactures, and markets high-performance analog and mixed-signal integrated circuits and high-reliability semiconductors. The company also gets A’s in operating margin growth. For more information, get Portfolio Grader’s complete analysis of MSCC stock.

Manning & Napier, Inc. Class A (MN) is an independent investment management firm that provides a broad range of investment solutions through separately managed accounts, mutual funds and collective investment trust funds. The company also gets A’s in operating margin growth and earnings growth. For more information, get Portfolio Grader’s complete analysis of MN stock.

Payment Data Systems, Inc.. The company also gets A’s in operating margin growth. For more information, get Portfolio Grader’s complete analysis of PYDS stock.

Integrated Electrical Services, Inc. (IESC) provides electrical contracting and maintenance services to the commercial, industrial, residential, and power line markets. The company also gets A’s in operating margin growth and earnings growth. For more information, get Portfolio Grader’s complete analysis of IESC 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.