Standard & Poor's Ratings Services said it raised its rating on the New Hampshire Municipal Bond Bank's existing bonds issued under the 2005 resolution two notches to AA from A-plus.
It assigned a AA rating to NHMBB's series 2015A bonds. The outlook is stable.
"The upgrade reflects a very strong financial risk score, which we previously determined to be strong, primarily reflecting the availability of additional equity and pledged reserves," said Standard & Poor's credit analyst Scott Garrigan.