Radian (RDN) loses 19 cents to $2.69 and a 1250-lot of Jan 2 puts traded on the stock for 75 cents when the market was 65 to 75 cents. 1765 traded and today’s flow probably adds to positions from yesterday, when open interest in the contract increased by 4,747 to 7,500 and now the largest position in the Philadelphia-based credit insurance company. Implied volatility is up 3.5 percent to 95, as shares tick lower for a fourth day this week. RDN is down almost 13 percent since Friday. Earnings slated for Feb 23.