Each business day, TheStreet.com Ratings compiles a list of the top five stocks in one of five categories -- fast-growth, all-around value, large-cap, mid-cap and small-cap -- based on data from the close of the previous trading session. Today, small-cap stocks are in the spotlight.

These are stocks of companies that have market capitalizations of between $50 million and $500 million that rank near the top of all stocks rated by our proprietary quantitative model, which looks at more than 60 factors.

The stocks must also be followed by at least one financial analyst who posts estimates on the Institutional Brokers' Estimate System. They are ordered by their potential to appreciate.

Note that no provision is made for off-balance-sheet assets such as unrealized appreciation/depreciation of investments, market value of real estate or contingent liabilities that might affect book value. This could be material for some companies with large underfunded pension plans.

Aceto ( ACET) engages in sourcing, quality assurance, regulatory support, marketing, and distribution of chemically derived pharmaceuticals, biopharmaceuticals, specialty chemicals and crop protection products. We have rated it a buy since August 2008. Our rating is based on a variety of strengths, including the company's impressive record of earnings per share growth and its largely solid financial position.

For the first quarter of fiscal 2009, the company announced quarterly sales of $93.8 million, an increase of 18% year over year. With a continued focus on cost containment and a shift in business mix contributed to a close to 200 basis point expansion in gross margin to 20.18% in the most recent period versus 18.3% a year earlier. Aceto's first quarter net income rose by over 250% when compared to the same quarter a year ago. This growth in turn helped boost EPS, which improved from 5 cents in the first quarter of fiscal 2008 to 18 cents in the most recent quarter. This continued a pattern of positive EPS growth demonstrated by Aceto over the past two years.

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