13 tesla model 3s are shown charging in an underground parking lot next to a tesla store in san diegocalifornia us may 30 2018 reutersmike blakefile photo may 2 reuters  tesla inc tslao was the biggest loser among top companies by market capitalisation in april hit by disappointing quarterly earnings after it posted the lowest quarterly gross margin in two years teslas market cap dropped to 5207 billion at the end of april from 6575 billion in march a 208 decline pushing it to 9th in the rankings from 7th in january it was followed by chinas tencent holdings  whose market cap fell 107 to 4199 billion last month amid heavy selling by technology investment firm prosus prxas on the other hand apple inc aaplo and microsoft corp msfto saw their market values jump after robust firstquarter earnings saudi aramco 2223se the worlds thirdmost valuable company saw its market capitalisation jump to 22 trillion in april a 125 increase over march reporting by patturaja murugaboopathy and gaurav dogra in bengaluru editing by mark potter