The index lost 0.21 point or 0.6% to close at 35.07.The gauge started with given mark of 100 on June 24, 2009 but it has never been back to that level.
The market volume edged up to 323,055 shares changed hands for VND2.77 billion, compared with 295,560 shares changed hands for VND1.79 billion on Wednesday trading.
The market breadth was negative with 9 gainers, 18 losers, 7 unmoved and the rest untraded.
GHC was the biggest gainer today, climbing VND1,400 to close at VND16,500/unit on a trade of 3,000 shares.
SPC was the biggest loser for the second day, giving up VND2,300 to hit the floor at VND21,300 with 100 units changed hands.
WSB was the most active stock today with 65,300 shares traded, losing VND200 per share to close at VND17,000/unit.
Foreigners bought 37000 WSB shares and sold 500 HPP shares, 65300 WSB shares today.