The purpose of this essay is to calculate the Backward Participation in Global Value Chains index of Puerto Rico and to assess the extent to which manufacturing industries create backward and forward linkages within the economy. The open quantitative model of the input-output analysis developed in this paper uses the total matrices of inter-industrial transactions. The results indicate that Puerto Rico exhibits one of the highest relative backward participation rates in GVC in the first years analyzed when compared to 39 OECD countries, ranking even in the first two places. However, in the last year considered, the Puerto Rican index experienced the largest relative decrease, falling 15 percentage points and standing at the average of the Latin American pairs with which it is compared. In addition, the industries that participate in the scheme remained with few or no linkages, except petrochemicals in the first two years. For the first time in the literature, this paper measures the rate of backward participation in global value chains of Puerto Rico and combines it with an analysis of key industries, contributing to closing the gap of empirical studies of Latin American and Caribbean countries on the subject.Esta investigación mide por primera vez en la literatura el índice de participación hacia atrás en cadenas globales de valor de Puerto Rico y lo combina con un análisis de industrias claves, contribuyendo a cerrar la brecha de estudios empíricos de países latinoamericanos y del Caribe. La metodología emplea el modelo cuantitativo abierto del análisis insumo-producto a partir de las matrices totales de transacciones inter-industriales. Los resultados indican que Puerto Rico exhibe uno de los mayores índices relativos de participación hacia atrás en CGV cuando es comparado con 39 países de la OCDE. Sin embargo, en el último año considerado, el índice puertorriqueño experimenta la disminución relativa más grande, al caer 15 puntos porcentuales y situarse en la media de los pares latinoamericanos con los que se compara.