 Shares of CoreLogic Inc. rallied 6.1 into record territory in premarket trading Tuesday, after CoStar Group Inc. proposed an unsolicited all-stock buyout bid for the real estate data provider that was valued 20 above the 80-per-share buyout bid CoreLogic already agreed to with Stone Point Capital and Insight Partners on Feb. 4. Under terms of CoStars bid, each CoreLogic shareholder would receive 0.1019 CoStar shares for each CoreLogic share they own, which based on Fridays closing prices would value CoreLogic stock at 95.76, or a 16.8 premium. 