Rosa, S.N., Tereza, L. , Agustina, E. , Desilfa, Y. and Sari, D. P.P. 2023. Formation of Optimal Portfolio Using A Single Index in Pharmaceutical Companies . Research in Accounting Journal (RAJ) . 4, 1 (Mar. 2023), 19–26. DOI:https://doi.org/10.37385/raj.v3i1.1892.