The CEO of Ambac Financial Group, Inc. (NYSE:AMBC) demonstrates confidence in the company by purchasing 25,000 shares.Despite a negative P/E ratio, AMBC's sales valuation metrics like the price-to-sales ratio remain relatively stable.The company's low debt-to-equity ratio and strong current ratio indicate a solid financial position to cover liabilities.Ambac Financial Group, Inc. (NYSE:AMBC) is a financial services company that provides financial guarantees and other financial services. The company operates ...