https://www.reuters.com/article/us-corelogic-m-a-costar/costar-counterbids-6-9-billion-for-real-estate-data-group-corelogic-idUSKBN2AG1D9 >Commercial property data vendor CoStar Group Inc said on Tuesday it has made a $6.9 billion all-stock offer to buy CoreLogic Inc, weeks after the real-estate data provider agreed to be acquired by two private equity firms.