The S&P SL20 closed 21.47 points lower at 3,287.53, down 0.65 percent.
Turnover amounted to 1.04 million rupees, up from 545.67 million rupees the previous day, with shares of 135 firms making losses against 47 gainers.
Foreigners bought shares worth 544.42 million rupees, up from 129.23 million the previous day, and sold shares worth 162.51 million rupees, up from 157.09 million the previous day.
JKH closed 3.30 rupees lower at 214.00 rupees with three crossings taking place and JKH rights closed 16.30 rupees lower at 45.20 rupees, featuring in a single crossing.
Aitken Spence Hotels closed 4.80 rupees lower at 66.70 rupees and CT Holdings closed 7.00 rupees lower at 150.00 rupees.
Lion Brewery closed 12.50 rupees lower at 356.50 rupees and Sri Lanka Telecom closed 50 cents lower at 39.30 rupees.
George Steuart Finance closed 94.90 rupees higher at 475.00 rupees and The Good Hope PLC closed 85.00 rupees higher at 1,275.00 rupees.
Carson Cumberbatch closed 2.70 rupees higher at 405.00 rupees and Nestle Lanka closed 6.00 rupees higher at 1,975.00 rupees.
Hatton National Bank closed flat at 150.00 rupees and featured in two crossings and Commercial Bank closed 90 cents lower at 118.00 rupees.
Sampath Bank closed flat at 177.00 rupees and featured in a single crossing.
Aitken Spence closed 1.00 rupee lower at 115.00 rupees with one crossing taking place. Speculative trading continued in Touchwood, closing 30 cents lower at 4.40 rupees after more than 2.2 million shares changed hands. Nation Lanka closed 10 cents higher at 7.90 rupees with more than 1.04 million trading. PCH Holdings, closing flat at 1.50 rupees, saw more than 4.6 million shares change hands. The rupee weakened/strengthened to 130.80/131.00 against the US dollar in late trading in the spot market, after opening at 131.00/05 amidst subdued activity levels, dealers said. Dealers said the rupee had gained after the US dollar weakened in global markets. A liquid five year Treasury bond was trading at 11.08 percent, from an opening position of 11.03/16.