 6 Meridian lessened its stake in BlackRock MuniHolding Insured Investm NYSE:MFL by 37.5 during the first quarter, according to the company in its most recent 13F filing with the SEC. The institutional investor owned 23,683 shares of the investment management companys stock after selling 14,210 shares during the quarter. 6 Meridian owned approximately 0.06 of ... 