UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 12, 2025 NioCorp Developments Ltd. (Exact name of registrant as specified in its charter) British Columbia, Canada (State or other jurisdiction of incorporation) 001-41655 (Commission File Number) 98-1262185 (IRS Employer Identification No.) 7000 South Yosemite Street, Suite 115 Centenn ...