The index lost 0.13 point or 0.38%, to close at 33.78.The gauge started with the given mark of 100 on June 24, 2009 but it has never been back to that level.
The market volume soared to 389,245 shares changed hands for VND6.36 billion compared with to 74,345 shares changed hands for VND0.44 billion on Tuesday trading.
The market breadth was negative with 10 gainers, 24 losers, 4 unmoved and the rest untraded.
WSB was the biggest gainer today, adding VND1,600 to close at VND18,300 with 100 shares traded.
STS was the biggest loser today, falling VND1,400 to close at VND12,600 on a trade of 52,045 units.
DLV was the most active stock today with 177,900 units traded, whose reference prices were VND26,000/unit.
Foreigners bought 1,500 GDW, 100 PSP shares and sold 500 GDW shares today.