Dun & Bradstreet , the 177-year-old financial services firm, has agreed to a $5.4 billion buyout by an investor group group led by CC Capital, Cannae and Thomas H. Lee-affiliated funds, the Wall Street Journal reported Thursday. Dun & Bradstreet shareholders will receive $145 in cash for each share, the buyers have said. That marks an 18% premium to the latest closing price. Market Pulse Stories are Rapid-fire, short news bursts on stocks and markets as they move. Visit MarketWatch.com for more information on this news.