"[The] Board of Directors have decided to dispose the Bank’s investment in Delma Exchange," HNB said in interim accounts filed with the Colombo Stock Exchange.
"Negotiations are under way to dispose this investment."
The statement did not give a reason for the sale.
HNB said it had 20 percent stake in Delma Exchange valued at 83.6 million rupees.
Many Sri Lankan banks have arrangements with foreign exchange houses to remit money. Millions of Sri Lankans work abroad in the Middle East, East Asia and some European countries.