BOSTON ( TheStreet) -- Shares of medium-sized companies are outpacing blue chips year, and the rally might not be over for these five mid-cap stocks. 5. Lincoln Educational Services ( LINC) provides career education. The numbers: Third-quarter profit more than doubled to $14 million, or 50 cents a share, as revenue grew 48% to $148 million. Lincoln's gross margin rose from 63% to 65%, and its operating margin increased from 10% to 16%. The company has a strong financial position, with $38 million of cash and $37 million of debt. The stock: Lincoln has advanced 64% this year, beating major U.S. indices. The stock trades at a price-to-earnings ratio of 15, a discount to the market and education peers. Lincoln doesn't pay dividends.