The index lost 0.32 point, or 0.9% to close at 35.08. The gauge started with given mark of 100 on June 24, 2009 but it has never been back to that level.
The market volume soared to 645.400 shares changed hands for VND4.14 billion, compared with 378,277 shares changed hands for VND2.42 billion on Monday trading.
The market breadth was negative with 16 gainers, 23 losers, 12 unmoved and the rest untraded.
HDM was the biggest gainer today, adding VND2,100 to close at VND23,800 with 100 shares traded.
GDW was the biggest loser, falling VND2,500 to close at VND23,300 on trade of 100 units.
FBA was the most active stock today with 226,800 shares traded, its reference prices were VND3,100/unit.
Foreign investors bought 1600 VQC shares, 20000 WSB shares today.