The combined assets of exchange-traded funds listed on U.S. exchanges rose $11.13 billion, or 3.3%, to $348.05 billion in August, the Investment Company Institute reported Wednesday. Assets in domestic-stock ETFs rose to $241.21 billion in August from $233.93 billion the previous month, while funds investing in international companies rose to $87.93 billion from $84.82 billion. During August, the value of all ETF shares issued exceeded that of shares redeemed by $3.71 billion, according to ICI, the main trade group for the mutual fund business.