TOKYO (Reuters) -Nomura Holdings, Japan's biggest brokerage and investment bank, reported on Friday a 670% jump in quarterly net profit compared to a year earlier as its retail and investment banking income rose to their highest levels in eight years. January-March net profit was 56.8 billion yen ($363.87 million) compared to 7.3 billion yen a year earlier when worries about a global banking crisis engulfed global markets and hit Nomura's investment banking business. The results show Nomura's continued recovery after it was forced to slash its profit targets last May after market turmoil precipitated two quarters of losses in its investment business.