Nilsa Guerrero-Mahon

CIK: 0001718789

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)0 (0.0%)

Position reduction

Option Exercises (M)0 (0.0%)

Derivative conversions

Awards (A)2 (100.0%)

Compensation grants

Other (G, F, J, C, D, …)0 (0.0%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (1)

NIOCORP DEVELOPMENTS LTD

Director

Discretionary Trading P&L

Holdings

Transaction History (2 total)

NB
NIOCORP DEVELOPMENTS LTD
Aug 18, 2025
Award(A)
Director Stock Option (Right to Buy)
Direct
55K shares-
NB
NIOCORP DEVELOPMENTS LTD
Dec 23, 2024
Award(A)
Director Stock Option (Right to Buy)
Direct
75K shares-

		Type	Shares	Price		Ownership
Aug 18, 2025	NB NIOCORP DEVELOPMENTS LTD	Award(A) Director Stock Option (Right to Buy)	55,000	-	-	Direct
Dec 23, 2024	NB NIOCORP DEVELOPMENTS LTD	Award(A) Director Stock Option (Right to Buy)	75,000	-	-	Direct

1-2 of 2 transactions

About Guerrero-Mahon Nilsa

Guerrero-Mahon Nilsa (SEC CIK 0001718789) files insider reports with the SEC as Director of NIOCORP DEVELOPMENTS LTD (NB).

Signal8 holds 2 ownership filings by Guerrero-Mahon Nilsa, all Form 4s, filed between Dec 23, 2024 and Aug 20, 2025. Those filings report 2 transactions, from Dec 23, 2024 to Aug 18, 2025. Signal8's Form 4 history starts in Sep 2024.

The business address on Guerrero-Mahon Nilsa's filings is in CENTENNIAL, CO.

Recent filings by Guerrero-Mahon Nilsa

Aug 18, 2025: Grant or award of NB derivative securities (Form 4, code A).
Dec 23, 2024: Grant or award of NB derivative securities (Form 4, code A).

Other insiders filing for NIOCORP DEVELOPMENTS LTD (NB)

Smith Mark A., President & CEO
Honan Scott, Chief Operating Officer
Cleave Ernest M., Senior VP Business Development
Shah Neal S., Chief Financial Officer
Kehler Dean C, Director
Fulton Anthony W, Director

How to read Form 4 transaction codes