The main All Share Price Index closed up 0.44 percent (23.34 points) at 5,308.51, while the more liquid Milanka index rose 1.13 percent (51.20 points) to close at 4,600.63.
Turnover was 1.1 billion rupees, according to stock exchange provisional figures.
Index heavyweight John Keells Holdings closed at 166.50 rupees, up 3.50 rupees.
Mercantile Shipping Company was the second highest gainer closing at 200 rupees, up 36.50 rupees, on just a sole transaction of 100 shares.
Softlogic Capital was the third highest gainer and rose 20 percent or 3.40 rupees to close at 19.90 rupees with 336,800 shares done.
Softlogic Capital had said in a stock exchange filing it will buy Arrenga Capital (Pvt) Ltd, a stock brokering firm for 200 million rupees.
PC House, the most actively tradd stock, closed at 11.30 rupees, up 20 cents with 4.7 million shares traded.
Environmental Resources Investments was also actively traded, closing at 19.40 rupees, up 70 cents.
Acme Printing & Packaging was another actively traded stock, closing at 26.90 rupees, up 40 cents.