NioCorp Announces Closing of $100.0 Million Public Offering of Common Shares

NioCorp Developments Ltd. (“NioCorp,” “our,” or the “Company”) (NASDAQ:NB), today announced the closing of its previously announced public offering in the United States (the “Offering”). The Offering consisted of 20,000,000 common shares (or pre-funded warrants in lieu thereof) at a public offering price of $5.00 per common share (or $4.9999 per pre-funded warrant), for gross proceeds of approximately $100.0 million before deducting placement agent fees and offering expenses.

Maxim Group LLC acted as sole placement agent for the Offering.

NioCorp currently intends to use the net proceeds from the Offering for working capital and general corporate purposes, including to advance a critical minerals project in Southeast Nebraska (the “Elk Creek Project”) and move it to commercial operation.

The Offering was made pursuant to an effective shelf registration statement on Form S-3ASR (File No. 333-290837), which was filed with the Securities and Exchange Commission (the “SEC“) and was automatically effective upon filing on October 10, 2025.

A final prospectus supplement and accompanying prospectus relating to the Offering and describing the terms thereof has been filed with the SEC and forms a part of the effective registration statement and is available on the SEC’s website at syndicate. The final prospectus supplement filed with the SEC is also available on the Company’s profile on the SEDAR+ website at www.sedarplus.ca. No securities were offered or sold to Canadian purchasers under the Offering.