Insider Transactions Reported by 15 Insiders of NIOCORP DEVELOPMENTS LTD

Symbol: NB, NIOBW on Nasdaq
Location: Centennial, CO

Quick Takeaways

NB - NIOCORP DEVELOPMENTS LTD has 15 insiders with reported activity on this page.
No net insider buy/sell flow is currently reported for the last year.
Recent transaction rows are available for direct filing-level review.

What Changed

No meaningful buy/sell imbalance is currently visible in the one-year window.
Activity will update as new Forms 3/4/5 are filed.

Why This Matters

This page gives a plain-language issuer insider context before you inspect transaction-level evidence.
Use the filing links below to verify timestamps, codes, and ownership impacts directly from SEC forms.

Official SEC Source

Filed on Form 4

Issuer insider activity is sourced from SEC Forms 3, 4, and 5.

See Original Filing

Insider trading overview

Last 12 months

Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 11 Apr 2025.

Buys

Shares: 0

Insiders: 0

Sells

Shares: 0

Insiders: 0

Net

Shares: 0

Insiders: 0

Window (months)	Buy $	Sell $	Net $
0-3	$0	$0	$0
3-6	$0	$0	$0
6-9	$0	$0	$0
9-12	$0	$0	$0

NIOCORP DEVELOPMENTS LTD executives and other stock owners filed with the SEC include:

Name	Relationship	Holdings Value	Valuation	Report Date
Mark A. Smith	President & CEO, Director	$8,208,619	Mixed	15 Dec 2025
Michael G. Maselli	Director	$2,505,907	Mixed	18 Aug 2025
Dean C. Kehler	Director	$752,543	Mixed	15 Dec 2025
Anthony W. Fulton	Director	$485,960	Mixed	18 Aug 2025
Neal S. Shah	Chief Financial Officer	$265,613	Mixed	15 Dec 2025
Anna Castner Wightman	Director	$125,213	Mixed	15 Nov 2023
Michael James Morris	Director		Mixed	23 Dec 2024
David Coates Beling	Director		Mixed	18 Aug 2025
Michael G. Maselli	Director		Mixed	17 Mar 2023
Ernest M. Cleave	Senior VP Business Development		Mixed	18 Aug 2025
Nilsa Guerrero-Mahon	Director		Mixed	18 Aug 2025
James T. Sims	Chief Communications Officer		Mixed	18 Aug 2025
Fernanda Reda Fenga Viana Klamas	Director		Mixed	25 Mar 2023
Peter Robert Oliver	Director		Mixed	18 Aug 2025
Scott Honan	Chief Operating Officer		Mixed	18 Aug 2025

Top shareholders of NIOCORP DEVELOPMENTS LTD (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.

Methodology: rows are grouped by holder and ranked by the holder's primary source value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

Holder	Source	Role / Reporting	Ownership %	Shares	Holdings Value	12M Net Δ	As of	Details
BlackRock, Inc.	13F 13D/G	Company	5.2% from 13D/G	6,381,301	$33,820,895	—	31 Dec 2025	13F 13D/G
CITADEL ADVISORS LLC	13D/G 13F	Kenneth Griffin · Company	4.3%	6,216,351	$27,724,925	+$25,460,182	25 Feb 2026	13D/G 13F
Brevan Howard Capital Management LP	13F	Company	1.8%	2,560,416	$13,570,205	—	31 Dec 2025	13F
PRIVATE MANAGEMENT GROUP INC	13F	Company	1.5%	2,145,364	$11,370,429	—	31 Dec 2025	13F
STATE STREET CORP	13F	Company	1.2%	1,768,356	$9,372,287	—	31 Dec 2025	13F
Alyeska Investment Group, L.P.	13F	Company	1.1%	1,600,000	$8,480,000	—	31 Dec 2025	13F
Mark A. Smith	3/4/5	President & CEO, Director	— mixed-class rows	2,693,819 mixed-class rows	$8,208,619	—	15 Dec 2025	3/4/5
GEODE CAPITAL MANAGEMENT, LLC	13F	Company	0.9%	1,306,157	$6,922,631	—	31 Dec 2025	13F
MILLENNIUM MANAGEMENT LLC	13F	Company	0.82%	1,191,723	$6,316,132	—	31 Dec 2025	13F
VANGUARD GROUP INC	13F	Company	0.76%	1,097,741	$5,818,027	—	31 Dec 2025	13F
Deltroit Asset Management (UK) LLP	13F	Company	0.74%	1,071,150	$5,677,095	—	31 Dec 2025	13F
NORTHERN TRUST CORP	13F	Company	0.72%	1,035,267	$5,486,915	—	31 Dec 2025	13F
GOLDMAN SACHS GROUP INC	13F	Company	0.63%	914,991	$4,849,452	—	31 Dec 2025	13F
Nuveen, LLC	13F	Company	0.61%	879,032	$4,658,870	—	31 Dec 2025	13F
JANE STREET GROUP, LLC	13F	Company	— mixed-class rows	922,585 mixed-class rows	$4,198,102	—	31 Dec 2025	13F
MORGAN STANLEY	13F	Company	— mixed-class rows	766,646 mixed-class rows	$4,062,880	—	31 Dec 2025	13F
Bridgewater Associates, LP	13F	Company	0.45%	645,889	$3,423,212	—	31 Dec 2025	13F
HITE Hedge Asset Management LLC	13F	Company	0.44%	634,906	$3,365,002	—	31 Dec 2025	13F
Counterpoint Mutual Funds LLC	13F	Company	0.42%	610,063	$3,233,334	—	31 Dec 2025	13F
BOOTHBAY FUND MANAGEMENT, LLC	13F	Company	— class O/S missing	510,000	$2,703,000	—	31 Dec 2025	13F
Michael G. Maselli	3/4/5	Director	— mixed-class rows	903,077 mixed-class rows	$2,505,907	—	18 Aug 2025	3/4/5
BALYASNY ASSET MANAGEMENT L.P.	13F	Company	0.31%	443,898	$2,352,659	—	31 Dec 2025	13F
Soviero Asset Management, LP	13F	Company	0.26%	380,000	$2,014,000	—	31 Dec 2025	13F
FOURSIXTHREE CAPITAL LP	13F	Company	0.24%	352,063	$1,865,934	—	31 Dec 2025	13F
GILDER GAGNON HOWE & CO LLC	13F	Company	0.24%	345,405	$1,830,647	—	31 Dec 2025	13F
ALPS ADVISORS INC	13F	Company	0.23%	326,053	$1,728,081	—	31 Dec 2025	13F
KINGDON CAPITAL MANAGEMENT, L.L.C.	13F	Company	0.22%	314,465	$1,666,665	—	31 Dec 2025	13F
Blue Owl Capital Holdings LP	13F	Company	— class O/S missing	876,148	$1,664,681	—	31 Dec 2025	13F
Point72 Asset Management, L.P.	13F	Company	0.19%	270,352	$1,432,866	—	31 Dec 2025	13F
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	13F	Company	0.18%	263,995	$1,399,174	—	31 Dec 2025	13F
SUSQUEHANNA INTERNATIONAL GROUP, LLP	13F	Company	0.17%	246,767	$1,307,865	—	31 Dec 2025	13F
UBS Group AG	13F	Company	0.16%	237,515	$1,258,830	—	31 Dec 2025	13F
Swiss National Bank	13F	Company	0.15%	221,200	$1,172,360	—	31 Dec 2025	13F
BARCLAYS PLC	13F	Company	0.15%	217,278	$1,151,574	—	31 Dec 2025	13F
Caption Management, LLC	13F	Company	— class O/S missing	617,756	$1,149,026	—	31 Dec 2025	13F
Bank of New York Mellon Corp	13F	Company	0.15%	216,625	$1,148,115	—	31 Dec 2025	13F
BANK OF AMERICA CORP /DE/	13F	Company	0.15%	213,086	$1,129,356	—	31 Dec 2025	13F
Arosa Capital Management LP	13F	Company	0.14%	200,000	$1,060,000	—	31 Dec 2025	13F
ARISTEIA CAPITAL, L.L.C.	13F	Company	— class O/S missing	557,901	$1,051,643	—	31 Dec 2025	13F
PFG Advisors	13F	Company	0.14%	196,675	$1,042,378	—	31 Dec 2025	13F
Harfst & Associates, Inc.	13F	Company	0.13%	184,620	$978,486	—	31 Dec 2025	13F
PEAK6 LLC	13F	Company	— mixed-class rows	313,341 mixed-class rows	$965,221	—	31 Dec 2025	13F
LPL Financial LLC	13F	Company	0.13%	181,142	$960,053	—	31 Dec 2025	13F
RAYMOND JAMES FINANCIAL INC	13F	Company	0.12%	171,341	$908,108	—	31 Dec 2025	13F
OSAIC HOLDINGS, INC.	13F	Company	— mixed-class rows	171,211 mixed-class rows	$907,157	—	31 Dec 2025	13F
BANK OF MONTREAL /CAN/	13F	Company	0.12%	168,938	$895,372	—	31 Dec 2025	13F
Altshuler Shaham Ltd	13F	Company	— class O/S missing	479,999	$892,798	—	31 Dec 2025	13F
D. E. Shaw & Co., Inc.	13F	Company	— mixed-class rows	177,433 mixed-class rows	$790,078	—	31 Dec 2025	13F
Dean C. Kehler	3/4/5	Director	— mixed-class rows	262,583 mixed-class rows	$752,543	—	15 Dec 2025	3/4/5
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC	13F	Company	0.1%	140,200	$743,060	—	31 Dec 2025	13F

Recent Insider Transactions by Companies or Individuals for NIOCORP DEVELOPMENTS LTD

Showing up to 300 most recent insider transactions from the last 12 months.

Insider	Symbol	Class	Transaction	%	Shares	Shares Owned	Date	Ownership
Mark A. Smith	NB	Common Shares	Exercise of in-the-money or at-the-money derivative security	2.06%	46,801	2,318,819	15 Dec 2025	Direct
Mark A. Smith	NB	Common Share Purchase Warrant (right to buy)	Exercise of in-the-money or at-the-money derivative security	-100%	-46,801	0	15 Dec 2025	Direct
Neal S. Shah	NB	Common Shares	Exercise of in-the-money or at-the-money derivative security	14.2%	9,361	75,032	15 Dec 2025	Direct
Neal S. Shah	NB	Common Share Purchase Warrant (right to buy)	Exercise of in-the-money or at-the-money derivative security	-100%	-9,361	0	15 Dec 2025	Direct
Dean C. Kehler	NB	Common Shares	Exercise of in-the-money or at-the-money derivative security	58%	78,003	212,583	15 Dec 2025	Direct
Dean C. Kehler	NB	Common Share Purchase Warrant (right to buy)	Exercise of in-the-money or at-the-money derivative security	-100%	-78,003	0	15 Dec 2025	Direct
Ernest M. Cleave	NB	Employee Stock Option (Right to Buy)	Award		100,000	100,000	18 Aug 2025	Direct
Anthony W. Fulton	NB	Director Stock Option (Right to Buy)	Award		50,000	50,000	18 Aug 2025	Direct
James T. Sims	NB	Employee Stock Option (Right to Buy)	Award		250,000	250,000	18 Aug 2025	Direct
Neal S. Shah	NB	Employee Stock Option (Right to Buy)	Award		250,000	250,000	18 Aug 2025	Direct
Peter Robert Oliver	NB	Director Stock Option (Right to Buy)	Award		60,000	60,000	18 Aug 2025	Direct
Dean C. Kehler	NB	Director Stock Option (Right to Buy)	Award		50,000	50,000	18 Aug 2025	Direct
Scott Honan	NB	Employee Stock Option (Right to Buy)	Award		250,000	250,000	18 Aug 2025	Direct
Nilsa Guerrero-Mahon	NB	Director Stock Option (Right to Buy)	Award		55,000	55,000	18 Aug 2025	Direct
David Coates Beling	NB	Director Stock Option (Right to Buy)	Award		50,000	50,000	18 Aug 2025	Direct
Mark A. Smith	NB	Employee Stock Option (Right to Buy)	Award		375,000	375,000	18 Aug 2025	Direct
Michael G. Maselli	NB	Director Stock Option (Right to Buy)	Award		50,000	50,000	18 Aug 2025	Direct

* An asterisk sign (*) next to the price indicates that the price is likely invalid.