Berkshire Hathaway Inc.'s BRK.B shares gained 2.2% after agreeing to buy natural-gas transmission and storage assets of Dominion Energy Inc. D for nearly $10 billion including debt.Shares of Uber Technologies Inc. UBER surged 6% following its decision to acquire food-delivery service provider Postmates for around $2.65 billion.Shares of Regeneron Pharmaceuticals Inc. REGN rose 0.8% following the initiation of phase 3 clinical trial testing an antibody cocktail for the potential treatment of COVID-19.SINA Corp.'s SINA shares jumped 10.6% after the company disclosed receiving a nearly $2.68 billion buyout bid from New Wave MMXV Ltd. Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report Berkshire Hathaway Inc. (BRK.B): Free Stock Analysis Report Regeneron Pharmaceuticals, Inc. (REGN): Free Stock Analysis Report Dominion Energy Inc. (D): Free Stock Analysis Report Sina Corporation (SINA): Free Stock Analysis Report Uber Technologies, Inc. (UBER): Free Stock Analysis Report To read this article on Zacks.com click here. Zacks Investment Research