The Colombo All Share Index closed down points at 22,032.93 points, falling -0.41 percent.
The S&P SL 20 index of more liquid stocks closed down -19.12 points at 6,349.00 points.
Sri Lanka stocks had seen strong upward momentum over previous days.
On Wednesday, investors locked in recent profits, resulting in a lower market finish.
On Wednesday 75 stocks advanced and 149 declined.
Dialog Axiata PLC closed at 121 rupees down -5.50 rupees.
Abans Electricals PLC closed at 1,018 rupees down -29.25 rupees.
Carbon Cumberbatch PLC closed at 705 rupees down -6.75 rupees.
Hatton National Bank PLC closed at 410 rupees down – 5.00 rupees.
Nations Trust Bank PLC closed at 350 rupees down -2.00 rupees.
Seylan Bank PLC closed at 101 rupees down -1.50 rupees.
ACL Cables PLC closed at 102 rupees down -2.00 rupees.
Colombo Fort Investment PLC closed at 308 rupees down -11.00 rupees.
Commercial Credit And Finance PLC closed at 102 down -2.25 rupees.