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Do you consider a company's sales trends when evaluating stocks? For ideas on how to start your own sales analysis, we ran a screen you may be interested in.

We ran a screen on companies that use or produce sources of clean energy for those with negative sales trends, comparing changes in revenue to inventory and accounts receivable.

We began by comparing growth in revenue to growth in inventory over the last year. We screened for stocks with negative sales trends, with faster growth in inventory than revenue over the last year. Since inventory represents the portion of goods not yet sold, slower growth in revenue than inventory is considered a negative sign.

To screen for declining liquidity, we also only focused on those companies with inventory increasing as a percent of current assets.

We then screened for those stocks with weak sales trends, comparing growth in revenue to growth in accounts receivable. Since accounts receivable is the portion of revenue not yet received, and there is no guarantee the money will ever be received, the smaller the portion of revenue made up of receivables the healthier the company's revenue.

We screened for stocks seeing slower growth in revenue than accounts receivable year-over-year, as well as accounts receivable comprising a larger portion of current assets over the same time period.

Interactive Chart: Press Play to compare changes in market cap over the last two years for the stocks mentioned below. Analyst ratings sourced from Zacks Investment Research.

We also created a price-weighted index of the stocks mentioned below, and monitored the performance of the list relative to the S&P 500 index over the last month. To access a complete analysis of this list's recent performance, click here.

Do you think these companies are in hot water? Use this list as a starting point for your own analysis.

List sorted by change in revenue over the last year.

1. First Solar, Inc. (FSLR): Manufactures and sells solar modules using a thin-film semiconductor technology. Market cap at $1.43B, most recent closing price at $16.26. Revenue grew by -12.38% during the most recent quarter ($497.06M vs. $567.29M y/y). Accounts receivable grew by 132.4% during the same time period ($867.52M vs. $373.28M y/y). Receivables, as a percentage of current assets, increased from 26.77% to 29.91% during the most recent quarter (comparing 3 months ending 2012-03-31 to 3 months ending 2011-03-31). Inventory grew by 145.64% during the same time period ($705.57M vs. $287.24M y/y). Inventory, as a percentage of current assets, increased from 20.6% to 24.33% during the most recent quarter (comparing 3 months ending 2012-03-31 to 3 months ending 2011-03-31).

2. Vectren Corporation (VVC): Provides energy delivery services to residential, commercial, and industrial and other customers in Indiana and west central Ohio. Market cap at $2.38B, most recent closing price at $28.84. Revenue grew by -11.43% during the most recent quarter ($604.6M vs. $682.6M y/y). Accounts receivable grew by -0.74% during the same time period ($214.6M vs. $216.2M y/y). Receivables, as a percentage of current assets, increased from 39.% to 43.34% during the most recent quarter (comparing 3 months ending 2012-03-31 to 3 months ending 2011-03-31). Inventory grew by 11.4% during the same time period ($147.5M vs. $132.4M y/y). Inventory, as a percentage of current assets, increased from 23.89% to 29.79% during the most recent quarter (comparing 3 months ending 2012-03-31 to 3 months ending 2011-03-31).

3. Maxwell Technologies Inc. (MXWL): Develops, manufactures, and markets energy storage and power delivery products, and microelectronic products. Market cap at $259.26M, most recent closing price at $8.77. Revenue grew by 11.26% during the most recent quarter ($39.23M vs. $35.26M y/y). Accounts receivable grew by 33.59% during the same time period ($43.15M vs. $32.3M y/y). Receivables, as a percentage of current assets, increased from 35.52% to 40.12% during the most recent quarter (comparing 3 months ending 2012-03-31 to 3 months ending 2011-03-31). Inventory grew by 33.61% during the same time period ($30.61M vs. $22.91M y/y). Inventory, as a percentage of current assets, increased from 25.2% to 28.46% during the most recent quarter (comparing 3 months ending 2012-03-31 to 3 months ending 2011-03-31).

4. Newpark Resources Inc. (NR): Provides fluids management, waste disposal, and well site preparation products and services primarily to the oil and gas exploration and production industry. Market cap at $571.76M, most recent closing price at $6.22. Revenue grew by 29.45% during the most recent quarter ($262.34M vs. $202.65M y/y). Accounts receivable grew by 77.18% during the same time period ($354.71M vs. $200.2M y/y). Receivables, as a percentage of current assets, increased from 44.53% to 59.33% during the most recent quarter (comparing 3 months ending 2012-03-31 to 3 months ending 2011-03-31). Inventory grew by 54.% during the same time period ($189.28M vs. $122.91M y/y). Inventory, as a percentage of current assets, increased from 27.34% to 31.66% during the most recent quarter (comparing 3 months ending 2012-03-31 to 3 months ending 2011-03-31).

*Accounting data sourced from Google Finance, all other data sourced from Finviz.

Source: 4 Clean Energy Stocks With Negative Inventory, Receivable Trends