The index lost 0.09 point or 0.26% to close at 34.56.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 dropped to 3,532,742 shares changed hands for VND153.08 billion, compared with 4,168,110 shares changed hands for VND200.68 billion on Monday trading.
The market breadth was flat with 17 gainers, 17 losers, 9 unmoved and the rest untraded.
VDN was the biggest gainer today, adding VND1,800 to hit the ceiling at VND6,300 with 100 shares traded.
MEF was the biggest loser for the third day today, falling VND1,400 to hit the floor at VND12,900 on a trade of 100 units.
NHN was the most active stock for a fourth day in a row today with 3,000,000 shares traded. Its reference prices were VND49,000/unit.