This week, the overall grades of three Packaging stocks are lower, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Silgan Holdings’ (NASDAQ:SLGN) rating falls to a D (“sell”) this week, down from C (“hold”) the week prior. Silgan Holdings manufactures metal and plastic packing products for consumer goods. To get an in-depth look at SLGN, get Portfolio Grader’s complete analysis of SLGN stock.

Crown Holdings’ (NYSE:CCK) rating weakens this week, dropping to a D versus last week’s C. Crown Holdings is engaged in designing, manufacturing and sales of packaging products for consumer goods. For a full analysis of CCK stock, visit Portfolio Grader.

Sealed Air Corp. (NYSE:SEE) ratings are on the decline this week as the company earns an F (“strong sell”). Last week, it received a D (“sell”). Sealed Air is a global manufacturer of packaging materials and equipment systems used in a range of food, industrial, medical, and consumer applications. The stock gets F’s in Earnings Growth, Earnings Momentum, and Earnings Surprise. Cash Flow and Margin Growth also get F’s. For more information, get Portfolio Grader’s complete analysis of SEE 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.