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

Watsco’s (NYSE:WSO) grade is moving up to a B (“buy”) this week from last week’s C (“hold”). Watsco is an independent distributor of air conditioning, heating and refrigeration equipment and related parts and supplies in the United States. Shares of WSO have increased 10.2% over the past month, better than the 3.4% increase the S&P 500 has seen over the same period of time. The stock’s dividend yield is 2.5%. For more information, get Portfolio Grader’s complete analysis of WSO stock.

Kaman Corp. (NYSE:KAMN) earns a B this week, jumping up from last week’s grade of C. Kaman serves government and commercial markets through its diversified technologies and distribution segments. Investors have pushed the stock price up 8.3% over the past month. For more information, get Portfolio Grader’s complete analysis of KAMN stock.

This is a strong week for CAI International (NYSE:CAP). The company’s rating climbs to B from the previous week’s C. CAI International operates in the intermodal marine cargo container leasing business in the United States and internationally. The stock has a trailing PE Ratio of 7.40. For more information, get Portfolio Grader’s complete analysis of CAP 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.