AUSTIN, Texas--(BUSINESS WIRE)--Fitch Ratings assigns ratings to Fort Bend Independent School District, Texas' (ISD; the district) unlimited tax (ULT) bonds as follows: --$49.6 million variable rate ULT school building bonds, series 2015A 'AAA' enhanced / 'AA+' underlying; --$49.4 million variable rate ULT school building bonds, series 2015B 'AAA' enhanced / 'AA+' underlying. The 'AAA' long-term rating on the bonds is based on a guaranty provided by the Texas Permanent School Fund (PSF), whose