Oakmark Global Fund underperformed the benchmark, the MSCI World Index, in the third quarter, according to its latest fund letter.Oakmark Global Fund bought new positions in Salesforce (NYSE:CRM); Dassault Systèmes (OTCPK:DASTY); Hexagon (OTCPK:HXGBF); and Targa Resources (NYSE:TRGP) during the quarter.The fund exited from Amazon.com (NASDAQ:AMZN) (TSX:AMZN:CA); Centene (NYSE:CNC); and St. James's Place (OTCPK:STJPF). ...