One of the leading US insurance companies UnitedHealth Group Inc.  (NYSE: UNH) is poised to acquire data analyst Change Healthcare (NASDAQ: CHNG) for $ 13 billion. The acquisition will strengthen the software and analytics segment.  UnitedHealth Group is offering $ 25.75 for Change Healthcare shares.  But already at the auction on January 6, shares rose by more than 30%.  Over the past 12 months, the company's shares have risen in price by more than 20% and at the auction on January 7 were worth $ 365.03.  The company remains one of the leaders in the US health insurance market and continues to expand in new directions.