 Ladenburg Thalmann Financial Services Inc. boosted its stake in BlackRock MuniYield Pennsylvania Insured NYSE:MPA by 11.6 in the 4th quarter, HoldingsChannel.com reports. The institutional investor owned 54,064 shares of the investment management companys stock after buying an additional 5,610 shares during the quarter. Ladenburg Thalmann Financial Services Inc.s holdings in BlackRock MuniYield Pennsylvania Insured were ... 