Won slide puts spotlight on offshore NDF trading

First came Korean retail investors pouring money into US stocks.

Then came overseas investors trimming their exposure to Korean equities.

Now authorities are turning their attention to another potential factor behind the won's sharp depreciation: trading in the offshore derivatives market.

With the Korean won sliding to lows not seen since early 2009, authorities have flagged nondeliverable forward trading as a potential source of excessive volatility and stepped up monitoring of offshore transa ...