The S&P SL20 closed 6.02 points lower at 3,274.31, down 0.18 percent, after reaching an intraday high of 3,283.35.
Turnover was 419.36 million rupees, down from 1.09 billion rupees last Friday, with stocks of 153 firms closing in the red in a broad sell-off against 61 gainers.
Commercial Leasing and Finance closed 30 cents lower at 3.80 rupees and Asian Hotels and Properties closed 4.20 rupees lower at 70.30 rupees, contributing most to the market fall.
Foreigners brought 151 million rupees worth shares while selling 141 million rupees of shares.
Lanka Orix Leasing Company closed 4.00 rupees higher at 65.00 rupees and Carson Cumberbatch closed 5.00 rupees higher at 385.00 rupees, contributing most to the index gain.
Bukit Darah closed 5.20 rupees higher at 680.20 rupees, also contributed the index positively.
Sri Lanka Telecom closed 90 cents lower at 38.70 rupees and Nestle Lanka closed 25.00 rupees lower at 1,920.00 rupees.
JKH closed 10 cents higher at 225.00 rupees and Cargills Ceylon closed flat at 149.00 rupees. Dialog closed flat at 9.00 rupees.
Ceylon Tobacco Company closed flat at 1,120.10 rupees and Distilleries closed 70 cents lower at 184.40 rupees.
Commercial Bank of Ceylon closed 50 cents lower at 117.50 rupees and NDB Bank closed 10 cents lower at 158.40 rupees.
Union Bank closed 20 cents lower at 17.50 rupees and Ceylinco Insurance closed 2.50 rupees higher at 1,300.10 rupees.
Touchwood ended down 20 cents to 4.10 rupees. PCH Holdings closed flat at 1.60 rupees and PC House ended down 10 cents to 80 cents.