TheStreet.com Ratings provides exclusive stock, ETF and mutual fund recommendations using proprietary tools. Our "safety first" approach aims to reduce risk while achieving total return performance.BOSTON ( TheStreet) -- The following companies have market values of $50 million to $500 million and receive "buy" ratings from our proprietary quantitative model, which considers more than 60 factors. They are ordered by their potential to appreciate. Hawkins ( HWKN) blends and distributes bulk and specialty chemicals for water treatment, and industrial and pharmaceutical use. The numbers: Fiscal fourth-quarter revenue ascended 32% to $68 million as net income surged 194% to $5.1 million and earnings per share climbed 182% to 48 cents. The operating margin increased to 11% and the net margin jumped to 8%. The company has zero debt and ample liquidity, as reflected by a quick ratio of 2.1. The stock: Hawkins has risen 26% in 2009, beating the Dow Jones Industrial Average and S&P 500 Index. Yet the stock trades at a price-to-earnings ratio of 8, indicating a vast discount to the market, and pays a 2.7% dividend yield. American Physicians Group ( AMPH) provides medical professional liability insurance for physicians and health-care providers in Texas. The company also has an investment arm that gives advice and asset-management services to institutions and wealthy individuals. The numbers: First-quarter revenue fell 2% to $19 million as net income increased 40% to $4.7 million and earnings per share climbed 46% to 67 cents. The operating margin surged to 38% and the net margin widened to 25%. The company boasts minimal debt and ample liquidity, as reflected by $38 million of cash. The stock: American Physicians Group is up 6% in 2009, beating the Dow but underperforming the S&P 500. The stock trades at a cheap price-to-earnings ratio of 8 and offers a 1.3% dividend yield.