The S&P SL20 closed 1.41 points lower at 3,255.93, down 0.04 percent.
Turnover amounted to 722.97 million rupees, up from 490.34 million rupees the previous day, with shares of 117 firms gaining against 83 losers.
Foreigners bought shares worth 349.85 million rupees, up from 232.04 million rupees the previous day, and sold shares worth 20.29 million rupees, down from 183.98 million rupees yesterday.
Ceylon Tobacco closed 32.40 rupees higher at 1,147.60 rupees and featured in one crossing.
Dialog closed 20 cents higher at 8.90 rupees and Sri Lanka Telecom closed 60 cents higher at 39.90 rupees.
Ceylon Guardian Investment closed 9.90 rupees higher at 199.90 rupees and Finlays Colombo closed 16.00 rupees higher at 275.00 rupees.
Commercial Bank closed 50 cents higher at 118.20 rupees and United Motors closed 30 cents higher at 107.30 rupees.
JKH closed 3.90 rupees lower at 215.10 rupees and featured on one crossing.
Lion Brewery closed 19.90 rupees lower at 355.00 rupees and Distilleries closed 2.00 rupees lower at 185.00 rupees.
Aitken Spence closed 1.40 rupees lower at 113.60 rupees and Lanka Ceramic closed 18.00 rupees lower at 101.80 rupees.
Speculative trading continued in Touchwood, closing 0.40 cents higher at 5.00 rupees with more than 22 million shares changing hands.
Swarnamahal Finance closed 50 cents higher at 2.50 rupees and saw more than 8.32 million shares trade.
Nation Lanka closed 20 cents higher with 1.37 million shares changing hands.
Sierra Cables closed 10 cents higher at 2.20 rupees after 4.24 million shares changed hands.
Blue Diamonds closed 20 cents higher at 3.50 rupees on more than 2.57 million shares changing hands.
The rupee strengthened against the US dollar to 131.10/13 in late trading in the spot market from an opening of 131.21/23 on banks selling forward dollar contracts, dealers said.
Dealers said there was some investor interest in the secondary Treasury bond market with a more liquid five year bond yield trading at 11.65/67 percent from an opening position of 11.59/72 percent.