...Study Overview: This study provides data and analysis of the performance of Fitch Thailand's corporate finance (including financial and nonfinancial corporates) and structured finance public national ratings in 2018 and over the long-term period 2002¡2018. Fitch Thailand rated 52 corporate finance issuers and five structured finance national ratings at the end of 2018. No Defaults: Fitch Thailand recorded no national rating defaults for either corporate finance rated entities or structured finance securities through 2018. Examining the corporate finance entities rated at the beginning of 2018 by rating category, two were upgraded, one downgraded and five withdrawn. The remaining entities were unchanged. (See the Thailand Corporate Finance National Ratings One-Year Transition Matrix below.) All five structured finance ratings remained unchanged at `AAA(tha)'. Fitch Thailand National Ratings: This study should be read in conjunction with Fitch Ratings' National Scale Ratings Criteria, dated...