Page 1

☑ 区 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D. C. 20549 FORM 10 - K ( Mark One ) ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended June 30 , 2021 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF ☐ 1934 For the transition period from to Commission file number : 000-55710 NioCorp SUPERALLOY MATERIALS NioCorp Developments Ltd. ( Exact name of registrant as specified in its charter ) British Columbia , Canada ( State or other jurisdiction of incorporation or organization ) 7000 South Yosemite Street , Suite 115 Centennial , CO ( Address of principal executive offices ) Title of each class Not Applicable 98-1262185 ( I.R.S. Employer Identification No. ) Registrant's telephone number , including area code : ( 855 ) 264-6267 Securities registered pursuant to Section 12 ( b ) of the Act : Trading Symbol ( s ) Not Applicable 80112 ( Zip Code ) Name of each exchange on which registered Not Applicable par value Securities registered pursuant to section 12 ( g ) of the Act : Common Shares , without Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . Yes ☐ No ☑ Yes No ☑ Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes ☑No ☐ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( §232.405 of this chapter ) during the preceding 12 months ( or for such shorter period that the registrant was required to submit such files ) . Yes ☑No ☐ Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company , or an emerging growth company . See the definitions of “ large accelerated filer , ” “ accelerated filer , ” “ smaller reporting company , " and " emerging growth company ” in Rule 12b - 2 of the Exchange Act . Large Accelerated Filer Non - Accelerated Filer ☑ Accelerated Filer Smaller Reporting Company Emerging Growth Company ☐ ☐ ☑