TheStreet.com Ratings provides exclusive stock, ETF and mutual fund ratings and commentary based on award-winning, proprietary tools. Its "safety first" approach to investing aims to reduce risk while seeking total return performance. TheStreet.com's stock-rating model upgraded Amtrust Financial Services ( AFSI) to "buy." The numbers: Second-quarter net income increased 2% to $27 million, or 45 cents a share. Revenue grew 5% to $183 million. Its gross margin dropped from 32% to 25% and its operating margin fell from 23% to 20%. Amtrust is adequately capitalized, with $447 million of cash. But a debt-to-equity ratio of 1.2 indicates higher-than-ideal leverage. The stock: Amtrust has advanced 11% this year, outperforming the Dow Jones Industrial Average, but underperforming the S&P 500 Index. The stock trades at a price-to-earnings ratio of 9, indicating a sizable discount to the market and insurance peers, and offers a 1.9% dividend yield. The model upgraded racetrack owner Churchill Downs ( CHDN) to "buy." The numbers: Second-quarter profit rose 5% to $31 million, or $2.20 a share, as revenue increased marginally to $180 million. Its gross margin fell from 40% to 38% and its operating margin decreased from 28% to 27%. Churchill has a weak liquidity position, evident in its quick ratio of 0.5. But its balance sheet holds minimal debt. The stock: Churchill Downs has fallen 4% this year, trailing major U.S. indices. The stock trades at a price-to-earnings ratio of 22, which is a slight premium to the market, but equal to gaming peers. The company pays a 1.3% dividend yield. The model upgraded aerospace and defense company Rockwell Collins ( COL) to "buy." The numbers: Fiscal third-quarter net income fell 17% to $145 million, or 91 cents a share. Revenue declined 9% to $1.1 billion. Its gross margin decreased from 33% to 32% and its operating margin slid from 21% to 20%. A quick ratio of 0.8 reflects less-than-ideal liquidity, but a debt-to-equity ratio of 0.4 indicates a sound capital structure.