The largest additions to the index will be the U.S.-based companies Builders Firstsource, Lattice Semiconductor and Deckers Outdoor Corp.

The three largest additions to its emerging markets index will be Beijing-Shanghai High Speed Railway, Jinko Solar and Xinjiang Daqo New Energy.

MSCI also said Societatea Nationala Nuclearelectrica, Orange Cote D'Ivoire, and Sodep Marsa Maroc will be added to its frontier markets index.

The changes will be effective as of the close of May 31, MSCI said.

(Reporting by Rodrigo Campos; Editing by Chris Reese)