BNP Paribas reported a stronger-than-expected increase in third-quarter profit on Wednesday, supported by robust investment banking performance and record equity trading revenue. France's largest bank by assets also announced a €1.3 billion ($1.45 billion) share buyback, while downplaying concerns over its exposure to rising government bond yields.BNP Paribas' net income rose 14% year-on-year to €3.46 billion, exceeding the average analyst forecast of €3.23 billion.