NioCorp Developments Ltd. (Nasdaq: NB) announced the closing of its previously announced registered direct offering in the United States priced at-the-market in accordance with the rules of The Nasdaq Stock Market LLC. The Offering consisted of 16,077,175 common shares (or pre-funded warrants in lieu thereof) at an offering price of $9.34 per common share (or $9.3399 per pre-funded warrant), for gross proceeds of approximately $150.2 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 its efforts to launch construction of 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) previously filed with the Securities and Exchange Commission on October 10, 2025, that became effective upon filing pursuant to Rule 462(e) of the United States Securities Act of 1933, as amended. A final prospectus supplement and accompanying prospectus relating to the Offering and describing the terms thereof has been filed by the Company with the SEC and forms a part of the effective registration statement and is available on the SEC’s website at www.sec.gov and on the Company’s profile on SEDAR+ website at www.sedarplus.ca. Copies of the final prospectus supplement and accompanying prospectus may be obtained by contacting Maxim Group LLC, at 300 Park Avenue, 16th Floor, New York, NY 10022, Attention: Syndicate Department, or by email at syndicate@maximgrp.com. No securities were offered or sold to Canadian purchasers under the Offering.

This press release shall not constitute an offer to sell or the solicitation of an offer to buy these securities, nor shall there be any sale of these securities in any state or other jurisdiction in which such offer, solicitation or sale would be unlawful prior to the registration or qualification under the securities laws of any such state or other jurisdiction.