 FNY Investment Advisers LLC trimmed its stake in shares of Blackrock Muniyield Insured Fund Inc. NYSE:MYI by 53.9 in the 1st quarter, Holdings Channel reports. The firm owned 6,488 shares of the investment management companys stock after selling 7,594 shares during the period. FNY Investment Advisers LLCs holdings in Blackrock Muniyield Insured Fund were worth ... 