Did not know. Thanks for sharing.
Good to see the extension to file is projected in the near term (10 days for Canada and 18 days for the U.S.). Here is a copy/paste from the PR.
"NioCorp's management is working diligently to remedy the situation and anticipates the Required Documents will be filed as soon as they are available, likely by October 6, 2023. As a U.S. Securities and Exchange Commission (the "SEC") reporting issuer, NioCorp anticipates filing a Form 12b-25 Notice of Late Filing (the "12b-25 Notice") with the SEC on or before September 29, 2023, to provide for an extension to file its Annual Report on Form 10-K through October 13, 2023."