ZURICH--Credit Suisse Group (CS) said Wednesday its second-quarter net profit rose 3.6% from a year earlier, and it is planning to increase its capital by 15.3 billion Swiss francs ($15.6 billion). The bank said its net profit attributable to shareholders rose to CHF815 million in the second quarter from CHF787 million a year earlier. It also said the CHF15.3 billion capital addition includes an immediate amount of CHF8.7 billion. "Unquestioned capital strength is of paramount importance to the group," Chairman Urs Rohner said. "Given the current environment, we decided to accelerate the implementation of our capital plans in a manner which eliminates any doubts raised by the 2012 SNB Financial Stability Report." The Swiss National Bank in June published its periodic financial-stability report, singling out Credit Suisse as needing more capital. Write to Marta Falconi at marta.falconi@dowjones.com Subscribe to WSJ: http://online.wsj.com?mod=djnwires