James T. Sims - Aug 18, 2025 Form 4 Insider Report for NIOCORP DEVELOPMENTS LTD (NB)

Role: Chief Communications Officer
Signature: /s/ James T. Sims
Stock symbol: NB
Transactions as of: Aug 18, 2025
Transactions value $: $0
Form type: 4
Date filed: 8/20/2025, 04:45 PM
Previous filing: Dec 23, 2024
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Sims James T.	Chief Communications Officer	C/O NIOCORP DEVELOPMENTS LTD., 7000 YOSEMITE STREET, SUITE 115, CENTENNIAL	/s/ James T. Sims	2025-08-20	0001688496

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	NB	Employee Stock Option (Right to Buy)	Award	$0	+250K		$0.00	250K	Aug 18, 2025	Common Shares	250K	$4.35	Direct	F1

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

Explanation of Responses:

Id	Content
F1	34% of the options vested on the grant date and the remainder will vest in equal installments on each anniversary of the grant date until August 18, 2027.