After a week-long layoff, the VN-Index resumed a fierce recovery, closing up 2.6% on Wednesday. The index has surged 8.3% over the last three trading days after plunging more than 9% in the previous week. Back in 2016, four tickers - VNM, VCB, VIC and GAS - dominated trading. This 'Big Four' accounted for more than 42% of the index's market capitalization and invariably one of them would be the top contributor to the market's daily moves. With the listing over the past year of new large cap