 NEW YORK--BUSINESS WIRE--Halper Sadeh LLP, a global investor rights law firm, is investigating whether the sale of Extraction Oil Gas, Inc. NASDAQ: XOG to Bonanza Creek Energy, Inc. is fair to Extraction Oil shareholders. Under the terms of the merger agreement, Extraction shareholders will receive a fixed exchange ratio of 1.1711 shares of Bonanza Creek common shares for each share of Extraction common stock owned on the closing date. Upon completion of the transaction, Extraction Oi 