TSC 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 solid outperformance on a total return basis.TheStreet.com Ratings upgraded Amsurg ( AMSG to "buy." The company develops and operates ambulatory-surgery centers in partnership with U.S. physician-practice groups. The numbers: Fiscal first-quarter revenue rose 12% to $163 million as net income climbed 7.8% to $13 million and earnings per share ascended 8.1% to 40 cents, extending a growth streak to nine quarters. The cash balance is ample with $31 million of reserves. The debt-to-equity ratio is low at 0.6. The net margin is wide at 7.7% but has shed 30 basis points since last year's first quarter. The stock: Amsurg is down 10% in 2009, trading at a price-to-earnings ratio of about 13. The company has a market capitalization of $670 million. TheStreet.com Ratings initiated coverage of China Bio Energy ( CBEH at "hold." The company explores for, produces and distributes biodiesel, heavy oil and finished oil products. Roth Capital just initiated coverage as well, slapping a $9 price target and "buy" rating on the stock. The numbers: Fiscal first-quarter revenue surged 65% as net income climbed 54% to $7.2 million and earnings per share jumped 40% to 21 cents. The company has $36 million of cash, a high quick ratio of 10, and just $2.2 million of debt. The net margin is big at 12%. The stock: Shares of China Bio Energy are down 5% since being listed on Nasdaq. The company has a market capitalization of just $146 million. TheStreet.com Ratings upgraded Edison International ( EIX - Get Report) to "buy." Edison is a holding company for public utility California Edison and several non-utility energy companies.