A sharp retreat from tech-heavy equities in South Korea and Taiwan fuelled net emerging market stock outflows of $46.1 billion from foreign investor portfolios in June, banking trade group data showed, contributing to a second straight month of overall portfolio losses for developing economies. The monthly report from the Institute of International Finance said on Friday foreign investors pulled $30.5 billion from South Korean stocks - the biggest outflows in more than 25 years - while Taiwan equities bled $18.3 billion.