 Moodys Investors Service Moodys upgraded The Dun Bradstreet Corporations DNB corporate family rating CFR to B2 from B3 and upgraded the companys probability of default rating PDR to B2-PD from B3-PD. Concurrently, Moodys upgraded the companys senior secured bank facility and senior secured notes to B1 from B2 as well as its senior unsecured notes to Caa1 from Caa2. Moodys also assigned a speculative grade liquidity SGL rating of SGL-2. 