Two associate companies of Karnaphuli (HR Securities and Finvest Financial Services) are Members of Dhaka and Chittagong Stock Exchanges respectively and work as broker houses, dealing in shares and securities transacted at the Exchange.

Dhaka Stock Exchange Limited (DSE) the country's prime and oldest capital market, started its journey in 1954, the same year that Karnaphuli was incorporated.

With adoption of DSE's Vision 2013 and market based targets that envisages increase in daily trade volume from Bangladesh Taka 300 crore to 2000 crore, market capitalization from US$ 13 billion to 30 billion and increase in market capitalization to GDP ratio from the current 20% to 35% in 2013, coupled with Bangladesh's integration to the global capital market and onset of internet trading, this area of Karnaphuli's business holds much potential for growth and expansion.

Chittagong Stock Exchange was established in 1995 as the second stock exchange of Bangladesh in the Port City of Chittagong