<Tr> <Th> 18 </Th> <Td> General Motors </Td> <Td> Motor vehicles and parts </Td> <Td> $166,380 </Td> <Td> 7000920000000099999 ♠ 9.2% </Td> <Td> 225,000 </Td> <Td> </Td> <Td> Detroit, Michigan </Td> <Td> Mary Barra </Td> <Td> </Td> </Tr> <Tr> <Th> 19 </Th> <Td> AT&T </Td> <Td> Telecommunications </Td> <Td> $163,786 </Td> <Td> 7001116000000000000 ♠ 11.6% </Td> <Td> 268,540 </Td> <Td> </Td> <Td> Dallas, Texas </Td> <Td> Randall L. Stephenson </Td> <Td> </Td> </Tr> <Tr> <Th> 20 </Th> <Td> Exor </Td> <Td> Diversified financials </Td> <Td> $154,894 </Td> <Td> 7000150000000000000 ♠ 1.5% </Td> <Td> 302,562 </Td> <Td> </Td> <Td> Turin </Td> <Td> John Elkann </Td> <Td> </Td> </Tr> <Tr> <Th> 21 </Th> <Td> Ford Motor </Td> <Td> Automotive </Td> <Td> $151,800 </Td> <Td> 7000150000000000000 ♠ 1.5% </Td> <Td> 201,000 </Td> <Td> </Td> <Td> Dearborn, Michigan </Td> <Td> James Hackett </Td> <Td> </Td> </Tr>

Top 10 it companies in world by revenue