Carson Cumberbatch closed 10.00 rupees lower at 420.00 rupees and Commercial Bank closed 2.20 rupees lower at 146.30 rupees, contributing most to the index drop.
HNB closed 3.00 rupees lower at 166.80 rupees and Sampath Bank closed 3.70 rupees lower at 214.20 rupees.
Dialog Axiata closed 10 cents lower at 10.90 rupees and Sri Lanka Telecom closed 4.00 rupees higher at 56.00 rupees.
The Colombo benchmark All Share Price Index closed 7.46 points lower at 6,661.40, down 0.11 percent. The S&P SL20 closed 26.98 points lower at 3,708.16, down 0.72 percent.
Turnover was 1.67 billion rupees, down from 2.36 billion rupees a day earlier with 79 stocks closed positive against 128 negative.
DFCC Bank closed 3.40 rupees lower at 166.60 rupees with an off-market transaction of 162.50 million rupees changing hands at 162.50 rupees per share contributing 10 percent of the turnover.
The aggregate value of all off-the-floor deals represented 17 percent of the turnover.
George Steuart Finance closed 1.60 rupees lower at 52.40 rupees, attracting most number of trades during the day.