 NEW YORK--BUSINESS WIRE--SP Global Ratings published its full annual analysis of Build America Mutual and affirmed BAMs AA rating and stable outlook, the strongest rating SP assigns to any active bond insurer. SPs analysts found that municipal bond investors have demonstrated a heightened focus on credit quality, trading value stability, and market liquidity, since the second half of 2020, and that these factors drive the demand for bonds insured by BAM. BAM-insured munic 