ETF rebalancing weigh down VNIndex – The indices on which the two main ETF are benchmarked have set March 19th as the effective date for their announced quarterly reviews. Foreigners increased their trading activity, but were overall net sellers. Though we can’t know for sure, we think the ETFs might have decided to start rebalancing today as a lot of the trading came in at the last session, which is consistent with ETFs trading style. For instance, there was large foreign buying of STB which wi