CENTENNIAL, CO / ACCESS Newswire / June 10, 2025 / NioCorp Developments Ltd. (" NioCorp " or the " Company ") ( NASDAQ:NB ), a leading U.S. critical minerals development company, is pleased to announce that it has been added in the MSCI USA Stock Index , effective as of May 30, 2025, following the May index review by MSCI Inc. (" MSCI "). The MSCI USA Index is a part of the MSCI Global Small Cap Indexes, which capture small cap representation across 23 Developed Market countries. The index...