 BlackRock MuniHolding Insured Investm NYSE:MFL traded up 9.9 during mid-day trading on Friday . The stock traded as high as 12.06 and last traded at 11.36, 350,400 shares were traded during trading. An increase of 200 from the average session volume of 116,613 shares. The stock had previously closed at 10.34. The company has a ... 