The index lost 0.14 point, or 0.4% to close at 34.74. The gauge started with given mark of 100 on June 24, 2009 but it has never been back to that level.
The market volume continued easing to 200,602 shares changed hands for VND1.08 billion, compared with 247,640 shares changed hands for VND1.46 billion on Wednesday trading.
The market breadth was negative with 11 gainers, 23 losers, 3 unmoved and the rest untraded.
DBM was the biggest gainer, climbing VND1,700 to hit the ceiling at VND18,800 on a trade of 600 shares.
BMJ was the biggest loser, giving up VND1,600 to hit the floor at VND14,900 with 600 units changed hands.
FBA was the most active stock with 43,900 shares traded, losing VND200 to hit the floor at VND2,700.
Foreigners bought 4000 BTW shares, 1000 NBW shares and 4500 VQC shares today.