State to Provide ~$200 Million in Potential Tax Incentives for NioCorp Over First 10 Years of Operations Upon NioCorp Meeting the Program's Job Creation and Investment Requirements

Signing of Legislation Supports Elk Creek Project Delivering ~450 Permanent Jobs, ~$6.59 Billion in Operating Expenses Over Project Life, and Hundreds of Millions in New State and Local Tax Revenue to Nebraska

CENTENNIAL, CO / ACCESS Newswire / April 20, 2026 / NioCorp Developments Ltd. ("NioCorp," "our," or the "Company") (NASDAQ:NB), a leading U.S. critical minerals developer, today announced that the State of Nebraska has enacted legislation designed to give NioCorp greater flexibility in qualifying for approximately $200 million over 10 years in state tax benefits in return for NioCorp investing hundreds of millions of dollars in Nebraska and creating approximately 450 full-time equivalent jobs in the state.

Nebraska Governor Jim Pillen signed the legislation into law on April 16 after the Nebraska legislature enacted it on April 10, 2026. The bill included a range of tax incentives for businesses and projects statewide. For NioCorp, the legislation extends the period during which companies like NioCorp must meet Tier 6 Nebraska Advantage Act employment and investment requirements.

"Projects like Elk Creek don't come along often for rural Nebraska, and when they do, we need to make sure the state is doing everything it can to help them succeed," said Sen. Bob Hallstrom of Syracuse, NE. "Nebraska wants to be a place where companies invest and grow, and this legislation reinforces that commitment. For southeast Nebraska, that means hundreds of good-paying jobs and lasting economic growth for communities that have been waiting a long time for this kind of opportunity. I was proud to sponsor this provision and grateful to my colleagues and Governor Pillen for getting it across the finish line."

"If we want to grow our economy, create new high-paying, high-skill jobs, and attract the kinds of industries that generate multi-generational revenue and opportunities for our citizens, as NioCorp's Elk Creek Project promises, we need to be able to compete with other states that aggressively court these companies," said Nebraska State Senator Brad von Gillern, Chairman of the Nebraska Unicameral's Revenue Committee. "Getting a strong return on our investment from these state incentives programs is absolutely essential, and that has been my number one priority for these types of legislative initiatives. That is why I was pleased to support LB 1165 and the provisions aimed at providing more flexibility to NioCorp and other companies to grow their businesses in Nebraska."

"I want to thank Governor Pillen, Revenue Committee Chairman Brad von Gillern, Senator Hallstrom, and members of the Nebraska Unicameral for supporting this effort," said Mark A. Smith, Chairman and CEO of NioCorp. "Nebraska has stood behind the Elk Creek Project from the very beginning, and this is another clear demonstration of that commitment. The support we continue to receive from the state, from Nebraska's federal delegation, and from the communities of southeast Nebraska means a great deal to our team and strengthens our resolve to deliver on what this project promises: good-paying jobs, lasting economic growth for the region, and a reliable domestic supply of the critical minerals that American manufacturers and our national defense depend on."

Mr. Smith added: "Nebraska continues to invest its confidence in this project, and we are fully committed to delivering on that."

The signing of this legislation is the latest in a series of actions by Nebraska's state government in support of the Elk Creek Project, which is expected to create approximately ~450 permanent direct jobs in southeast Nebraska, generate significant new tax revenue for the state and its counties, and support an estimated 2,100 additional jobs throughout the broader Nebraska economy.

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FOR MORE INFORMATION:

Jim Sims, Chief Communications Officer, NioCorp Developments Ltd., (720) 334-7066, jim.sims@niocorp.com

Alex Guthrie, Director, Investor Relations, NioCorp Developments Ltd., (647) 999-0527, aguthrie@niocorp.com

@NioCorp $NB #Niobium #Scandium #rareearth #neodymium #dysprosium #terbium #ElkCreek

ABOUT NIOCORP

NioCorp is developing the Elk Creek Project that is expected to produce niobium, scandium, and titanium. The Company also is evaluating the potential to produce several rare earths from the Elk Creek Project. Niobium is used to produce specialty alloys as well as High Strength, Low Alloy steel, which is a lighter, stronger steel used in automotive, structural, and pipeline applications. Scandium is a specialty metal that can be combined with Aluminum to make alloys with increased strength and improved corrosion resistance. Scandium is also a critical component of advanced solid oxide fuel cells. Titanium is used in various lightweight alloys and is a key component of pigments used in paper, paint and plastics and is also used for aerospace applications, armor, and medical implants. Magnetic rare earths, such as neodymium, praseodymium, terbium, and dysprosium are critical to the making of neodymium-iron-boron magnets, which are used across a wide variety of defense and civilian applications.

FORWARD-LOOKING STATEMENTS

This press release contains forward-looking statements within the meaning of the United States Private Securities Litigation Reform Act of 1995 and forward-looking information within the meaning of applicable Canadian securities laws (collectively "forward-looking statements"). Forward-looking statements may include, but are not limited to, statements regarding shifts in the policy environment, objectives, expectations and actions of the U.S. government; NioCorp's expectation of producing niobium, scandium, and titanium, and the potential of producing rare earths, at the Elk Creek Project; and NioCorp's confidence in and ability to secure sufficient project financing to complete construction of the Elk Creek Project and move it to commercial operation, as well as efforts and expenditures relating to the same. Forward-looking statements are typically identified by words such as "plan," "believe," "expect," "anticipate," "intend," "outlook," "estimate," "forecast," "project," "continue," "could," "may," "might," "possible," "potential," "predict," "should," "would" and other similar words and expressions, but the absence of these words does not mean that a statement is not forward-looking.

The forward-looking statements are based on the current expectations of the management of NioCorp and are inherently subject to uncertainties and changes in circumstances and their potential effects and speak only as of the date of such statement. There can be no assurance that future developments will be those that have been anticipated. Forward-looking statements reflect material expectations and assumptions, including, without limitation, expectations and assumptions relating to: NioCorp's ability to receive sufficient project financing for the construction of the Elk Creek Project on acceptable terms, or at all; the future price of and demand for metals, including Al-Sc alloy; and the stability of the financial and capital markets. Such expectations and assumptions are inherently subject to uncertainties and contingencies regarding future events and, as such, are subject to change. Forward-looking statements involve a number of risks, uncertainties or other factors that may cause actual results or performance to be materially different from those expressed or implied by these forward-looking statements. These risks and uncertainties include, but are not limited to, those discussed and identified in public filings made by NioCorp with the Securities and Exchange Commission and with the applicable Canadian securities regulatory authorities and the following: NioCorp's requirement of significant additional capital; NioCorp's ability to receive sufficient project financing for the construction of the Elk Creek Project on acceptable terms, or at all; NioCorp's ability to achieve the required milestones and receive the full $10.0 million in reimbursement under the Project Sub-Agreement with Advanced Technology International, an entity acting on behalf of the Defense Industrial Base Consortium under the authority of the U.S. Department of War; NioCorp's ability to receive a final commitment of financing from EXIM or other debt financing or financial support on acceptable timelines, on acceptable terms, or at all; NioCorp's ability to access the full amount of the expected net proceeds under the standby equity purchase agreement (the "Yorkville Equity Facility Financing Agreement") with YA II PN, Ltd., an investment fund managed by Yorkville Advisors Global, LP; NioCorp's ability to continue to meet the listing standards of The Nasdaq Stock Market LLC; risks relating to NioCorp's common shares, including price volatility, lack of dividend payments and dilution or the perception of the likelihood of any of the foregoing; the extent to which NioCorp's level of indebtedness and/or the terms contained in agreements governing NioCorp's indebtedness, if any, the Yorkville Equity Facility Financing Agreement or other agreements may impair NioCorp's ability to obtain additional financing, on acceptable terms, or at all; covenants contained in agreements with NioCorp's secured creditors that may affect its assets; NioCorp's limited operating history; NioCorp's history of losses; the material weaknesses in NioCorp's internal control over financial reporting, NioCorp's efforts to remediate such material weaknesses and the timing of remediation; the possibility that NioCorp may qualify as a passive foreign investment company under the U.S. Internal Revenue Code of 1986, as amended (the "Code"); the potential that the business combination with GX Acquisition Corp. II and other related transactions could result in NioCorp becoming subject to materially adverse U.S. federal income tax consequences as a result of the application of Section 7874 and related sections of the Code; cost increases for NioCorp's exploration and, if warranted, development projects; a disruption in, or failure of, NioCorp's information technology systems, including those related to cybersecurity; equipment and supply shortages; variations in the market demand for, and prices of, niobium, scandium, titanium and rare earth products; current and future offtake agreements, joint ventures, and partnerships, including NioCorp's ability to negotiate extensions to existing agreements or to enter into new agreements, on favorable terms or at all; NioCorp's ability to attract qualified management; estimates of mineral resources and reserves; mineral exploration and production activities; feasibility study results; the results of metallurgical testing; the results of technological research; changes in demand for and price of commodities (such as fuel and electricity) and currencies; competition in the mining industry; changes or disruptions in the securities markets; legislative, political or economic developments, including changes in federal and/or state laws that may significantly affect the mining and scandium alloy industries; trade policies and tensions, including tariffs; inflationary pressures; the impacts of climate change, as well as actions taken or required by governments related to strengthening resilience in the face of potential impacts from climate change; the need to obtain permits and comply with laws and regulations and other regulatory requirements; the timing and reliability of sampling and assay data; the possibility that actual results of work may differ from projections/expectations or may not realize the perceived potential of NioCorp's projects; risks of accidents, equipment breakdowns, and labor disputes or other unanticipated difficulties or interruptions; the possibility of cost overruns or unanticipated expenses in development programs; operating or technical difficulties in connection with exploration, mining, development or scandium alloy production activities; management of the water balance at the Elk Creek Project site; land reclamation requirements related to the Elk Creek Project; the speculative nature of mineral exploration and development, including the risks of diminishing quantities of grades of reserves and resources; claims on the title to NioCorp's properties; the infringement or loss of NioCorp's intellectual property rights; potential future litigation; and NioCorp's lack of insurance covering all of NioCorp's operations.

Should one or more of these risks or uncertainties materialize or should any of the assumptions made by the management of NioCorp prove incorrect, actual results may vary in material respects from those projected in these forward-looking statements.

All subsequent written and oral forward-looking statements concerning the matters addressed herein and attributable to NioCorp or any person acting on its behalf are expressly qualified in their entirety by the cautionary statements contained or referred to herein. Except to the extent required by applicable law or regulation, NioCorp undertakes no obligation to update these forward-looking statements to reflect events or circumstances after the date hereof to reflect the occurrence of unanticipated events.

Notes:

1. 2022 Elk Creek Technical Report. Estimates account for tax benefits NioCorp expected to receive from the Nebraska Advantage program.

2. Additional jobs created or supported were estimated using the Economic Policy Institute's Employment Multiplier for Metal Ore Mining, https://www.epi.org/publication/updated-employment-multipliers-for-the-u-s-economy/

SOURCE: NioCorp Developments Ltd.