(Bloomberg) -- ConocoPhillips agreed to acquire Marathon Oil Corp. in an all-stock deal valuing the company at about $17 billion, extending a major buying spree among the largest players in the US oil and gas industry.Most Read from BloombergWall Street Returns to T+1 Stock Trading After a CenturyWorld’s Largest Nuclear Plant Sits Idle While Energy Needs SoarNew BYD Hybrid Can Drive Non-Stop for More Than 2,000 Kilometers‘Not Gonna Be Pretty:’ Covid-Era Homebuyers Face Huge Rate JumpTreasuries H