The bourse fell 1.5 percent on the week.
The benchmark Colombo stock record finished down 0.44 percent, or 27.95 focuses, at 6,370.11, its most minimal close since April 12.
Results from Thursday's submission demonstrated that Britain voted to leave the 28-part alliance,
a shocking denial of the country's elites, that arrangements the greatest hit to the European venture of more noteworthy solidarity since World War II.
"Financial specialists are concerned over the Brexit, as it can affect Sri Lankan fares and some outside assets may exit from Sri Lanka," said Danushka Samarasinghe, research head, Softlogic Stockbrokers.
"Be that as it may, the greater issue is identified with in-house issues. For financial specialists, how the nearby changes are occurring is the principle concern contrasted with other outer components," he said.
A conceivable rate climb at the national bank's financial approach declaration later in the day and an absence of clarity in a proposition to reintroduce capital increase charge additionally weighed available.
The national bank will declare June financial approach rates at 1230 GMT on Friday and the business sector comprehensively anticipates that rates will be left enduring for a fourth straight month, in spite of the fact that a conceivable rate trek is not precluded.
Sri Lanka's bureau on June 15 affirmed a proposition to reintroduce the capital increases charge, particularly ashore deals.
Treasury charge yields ascended somewhere around 1 and 3 premise focuses at a week after week closeout on Wednesday. They have ascended somewhere around 7 and 43 premise focuses subsequent to the national bank left the key arrangement rates enduring on May 20.
Abroad subsidizes offloaded 1.7 million Sri Lankan rupees ($11,572.50) worth of values on Friday, extending the year-to-date net outside surge to 6.03 billion rupees worth of shares.
Turnover remained at 261.3 million rupees, most reduced since Feb. 11 and well beneath the current year's day by day normal of around 748.8 million rupees.
Offers in Hemas Holdings Plc fell 2.03 percent while Aitken Spence Plc slipped 5.91 percent and the greatest recorded moneylender Commercial Bank of Ceylon Plc lost 1.21 percent.
