NioCorp Developments (NB) Proxy filing summary

Executive summary

• Annual general meeting scheduled for April 6, 2026, at 10:00 a.m. MDT in Centennial, Colorado.

• Notice-and-access model used for electronic delivery of meeting materials, with paper copies available upon request.

• Only shareholders of record as of February 9, 2026, are eligible to vote at the meeting.

Voting matters and shareholder proposals

• Shareholders to receive and consider audited financial statements for the year ended June 30, 2025.

• Proposal to fix the number of directors at six for the ensuing year.

• Election of six directors for the upcoming year, with management recommending a vote for all nominees.

• Appointment of Deloitte & Touche LLP as independent auditors and authorization for the Board to fix their remuneration.

• Advisory, nonbinding vote on executive compensation (say-on-pay) recommended for approval.

• Approval sought for amendment and restatement of the Long Term Incentive Plan.

• Approval sought for amendment and extension of the Shareholder Rights Plan.

• Other business may be considered if properly brought before the meeting.

Board of directors and corporate governance

• Shareholders to set the number of directors at six and elect six directors for the next year.