Source- Bloomberg- The Amazon Inc. founder added $12 billion to his fortune as the companys shares surged 6.3 percent to $1614 in extended trading at 4:33 p.m. in New York -- on top of a 4 percent gain during the regular session -- after the retailer reported results that beat Wall Street estimates. That lifted Bezoss net worth to to $134 billion according to the Bloomberg Billionaires Index. It has been a turbulent week for the richest Americans in tech. On Tuesday Alphabet Inc. spooked investors after first-quarter results sparked concern that the Google parent plans to go on a spending binge punishing shares of Amazon Facebook Inc. and Netflix Inc. Bezos lost $4.6 billion that day and Alphabets Larry Page and Sergey Brin each lost $2 billion. Facebook co-founder Mark Zuckerberg whose fortune dropped $2.5 billion on Tuesday got a reprieve Thursday as his wealth increased by $5.8 billion a day after the social network posted better-than-expected results for the first quarter. He leapfrogged Spains Amancio Ortega to No. 5 in the global wealth ranking.