NB

SEC source: 0001539497-26-001926 · ownership.xml · derivative · entry 1

Cleave Ernest M. · CIK 0002084923 · Senior VP Business Development

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 97,720

Underlying: %Common Shares · 97,720 shares

Expires 2031-07-06

F1 · derivative.exercise_date: 34% of the options vested on the grant date, 33% of the options will vest on the first anniversary of the grant date, and the remaining balance will vest on the second anniversary of the grant date (July 6, 2028).

SEC source: 0001539497-26-001927 · ownership.xml · derivative · entry 1

Honan Scott · CIK 0001688584 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 162,866

Underlying: Common Shares · 162,866 shares

Expires 2031-07-06

F1 · derivative.exercise_date: 34% of the options vested on the grant date, 33% of the options will vest on the first anniversary of the grant date, and the remaining balance will vest on the second anniversary of the grant date (July 6, 2028).

SEC source: 0001539497-26-001925 · ownership.xml · derivative · entry 1

Shah Neal S. · CIK 0001688494 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 114,007

Underlying: Common Shares · 114,007 shares

Expires 2031-07-06

F1 · derivative.exercise_date: 34% of the options vested on the grant date, 33% of the options will vest on the first anniversary of the grant date, and the remaining balance will vest on the second anniversary of the grant date (July 6, 2028).

SEC source: 0001539497-26-001928 · ownership.xml · derivative · entry 1

Sims James T. · CIK 0001688496 · Chief Communications Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 97,720

Underlying: Common Shares · 97,720 shares

Expires 2031-07-06

F1 · derivative.exercise_date: 34% of the options vested on the grant date, 33% of the options will vest on the first anniversary of the grant date, and the remaining balance will vest on the second anniversary of the grant date (July 6, 2028).

SEC source: 0001539497-26-001929 · ownership.xml · derivative · entry 1

Smith Mark A. · CIK 0001496772 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 293,160

Underlying: Common Shares · 293,160 shares

Expires 2031-07-06

F1 · derivative.exercise_date: 34% of the options vested on the grant date, 33% of the options will vest on the first anniversary of the grant date, and the remaining balance will vest on the second anniversary of the grant date (July 6, 2028).

SEC source: 0001539497-25-003296 · ownership.xml · derivative · entry 2

Shah Neal S. · CIK 0001688494 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Shares · 9,361 shares

Expires 2025-12-22

SEC source: 0001539497-25-003296 · ownership.xml · nonDerivative · entry 1

Shah Neal S. · CIK 0001688494 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 75,032

SEC source: 0001539497-25-003297 · ownership.xml · derivative · entry 2

Smith Mark A. · CIK 0001496772 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Shares · 46,801 shares

Expires 2025-12-22

SEC source: 0001539497-25-003297 · ownership.xml · nonDerivative · entry 1

Smith Mark A. · CIK 0001496772 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,318,819

SEC source: 0001539497-25-003295 · ownership.xml · derivative · entry 2

Kehler Dean C · CIK 0001322745 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Shares · 78,003 shares

Expires 2025-12-22

SEC source: 0001539497-25-003295 · ownership.xml · nonDerivative · entry 1

Kehler Dean C · CIK 0001322745 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 212,583

SEC source: 0001539497-25-002199 · ownership.xml · derivative · entry 1

Guerrero-Mahon Nilsa · CIK 0001718789 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 55,000

Underlying: Common Shares · 55,000 shares

Expires 2030-08-19

F1 · derivative.exercise_date: 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.

SEC source: 0001539497-25-002200 · ownership.xml · derivative · entry 1

Honan Scott · CIK 0001688584 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 250,000

Underlying: Common Shares · 250,000 shares

Expires 2030-08-19

F1 · derivative.exercise_date: 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.

SEC source: 0001539497-25-002204 · ownership.xml · derivative · entry 1

Sims James T. · CIK 0001688496 · Chief Communications Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 250,000

Underlying: Common Shares · 250,000 shares

Expires 2030-08-19

F1 · derivative.exercise_date: 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.

SEC source: 0001539497-25-002203 · ownership.xml · derivative · entry 1

Shah Neal S. · CIK 0001688494 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 250,000

Underlying: Common Shares · 250,000 shares

Expires 2030-08-19

F1 · derivative.exercise_date: 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.

SEC source: 0001539497-25-002196 · ownership.xml · derivative · entry 1

Smith Mark A. · CIK 0001496772 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 375,000

Underlying: Common Shares · 375,000 shares

Expires 2030-08-19

F1 · derivative.exercise_date: 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.

SEC source: 0001539497-25-002201 · ownership.xml · derivative · entry 1

Kehler Dean C · CIK 0001322745 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 50,000

Underlying: Common Shares · 50,000 shares

Expires 2030-08-19

F1 · derivative.exercise_date: 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.

SEC source: 0001539497-25-002197 · ownership.xml · derivative · entry 1

BELING DAVID COATES · CIK 0001398069 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 50,000

Underlying: Common Shares · 50,000 shares

Expires 2030-08-19

F1 · derivative.exercise_date: 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.

SEC source: 0001539497-25-002202 · ownership.xml · derivative · entry 1

Oliver Peter Robert · CIK 0001930773 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 60,000

Underlying: Common Shares · 60,000 shares

Expires 2030-08-19

F1 · derivative.exercise_date: 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.

SEC source: 0001539497-25-002195 · ownership.xml · derivative · entry 1

Maselli Michael G. · CIK 0001614590 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 50,000

Underlying: Common Shares · 50,000 shares

Expires 2030-08-19

F1 · derivative.exercise_date: 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.

SEC source: 0001539497-25-002270 · ownership.xml · derivative · entry 1

Fulton Anthony W · CIK 0002084188 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 50,000

Underlying: Common Shares · 50,000 shares

Expires 2030-08-19

F1 · derivative.exercise_date: 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.

SEC source: 0001539497-25-002298 · ownership.xml · derivative · entry 1

Cleave Ernest M. · CIK 0002084923 · Senior VP Business Development

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 100,000

Underlying: Common Shares · 100,000 shares

Expires 2030-08-19

F1 · derivative.exercise_date: 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.

SEC source: 0001539497-24-002712 · ownership.xml · derivative · entry 1

Guerrero-Mahon Nilsa · CIK 0001718789 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 75,000

Underlying: Common Shares · 75,000 shares

Expires 2029-12-21

SEC source: 0001539497-24-002713 · ownership.xml · derivative · entry 1

Honan Scott · CIK 0001688584 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 100,000

Underlying: Common Shares · 100,000 shares

Expires 2029-12-21

SEC source: 0001539497-24-002708 · ownership.xml · derivative · entry 1

Shah Neal S. · CIK 0001688494 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 100,000

Underlying: Common Shares · 100,000 shares

Expires 2029-12-21

SEC source: 0001539497-24-002707 · ownership.xml · derivative · entry 1

Sims James T. · CIK 0001688496 · Chief Communications Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 100,000

Underlying: Common Shares · 100,000 shares

Expires 2029-12-21

SEC source: 0001539497-24-002716 · ownership.xml · derivative · entry 1

Smith Mark A. · CIK 0001496772 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 150,000

Underlying: Common Shares · 150,000 shares

Expires 2029-12-21

SEC source: 0001539497-24-002711 · ownership.xml · derivative · entry 1

Kehler Dean C · CIK 0001322745 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 50,000

Underlying: Common Shares · 50,000 shares

Expires 2029-12-21

SEC source: 0001539497-24-002714 · ownership.xml · derivative · entry 1

Morris Michael James · CIK 0001335734 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 75,000

Underlying: Common Shares · 75,000 shares

Expires 2029-12-21

SEC source: 0001539497-24-002715 · ownership.xml · derivative · entry 1

BELING DAVID COATES · CIK 0001398069 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 50,000

Underlying: Common Shares · 50,000 shares

Expires 2029-12-21

SEC source: 0001539497-24-002710 · ownership.xml · derivative · entry 1

Maselli Michael G. · CIK 0001614590 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 50,000

Underlying: Common Shares · 50,000 shares

Expires 2029-12-21

SEC source: 0001539497-24-002709 · ownership.xml · derivative · entry 1

Oliver Peter Robert · CIK 0001930773 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 50,000

Underlying: Common Shares · 50,000 shares

Expires 2029-12-21

SEC source: 0001539497-24-002706 · ownership.xml · derivative · entry 2

Maselli Michael G. · CIK 0001614590 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 239,996

Underlying: Common Shares · 323,085 shares

Expires not disclosed

F2 · security: Elk Class B shares were acquired from GX Sponsor II LLC ("Sponsor") in a pro rata distribution to all Sponsor members immediately following the closing of the business combination (the "Business Combination") contemplated by the Business Combination Agreement, dated as of September 25, 2022, as amended, entered into by and among GX Acquisition Corp. II, the Issuer, and Big Red Merger Sub Ltd, a wholly owned subsidiary of the Issuer. After the closing of the Business Combination, GX Acquisition Corp. II became an indirect subsidiary of the Issuer and changed its name to "Elk Creek Resources Corp." Reflects vested Elk Class B shares eligible for exchange to Issuer's common shares.

F1 · derivative.exercise_price: Reflects exchange of Class B common stock of Elk Creek Resources Corp ("Elk Class B Shares") exchanged for the Issuer's common shares on a one-for-one basis. Unvested Elk Class B Shares will vest if, from the closing of the Business Combination until the tenth anniversary thereof, the volume-weighted average price ("VWAP") of the Issuer's common shares exceeds certain thresholds as follows: (a) one-half will vest if the VWAP of the Issuer's common shares exceeds $12.50 for any 20 trading days within any 30 trading day period, and (b) the remaining half will vest if the VWAP of the Issuer's common shares exceeds $15.00 for any 20 trading days within any 30 trading day period.

F1 · price: Reflects exchange of Class B common stock of Elk Creek Resources Corp ("Elk Class B Shares") exchanged for the Issuer's common shares on a one-for-one basis. Unvested Elk Class B Shares will vest if, from the closing of the Business Combination until the tenth anniversary thereof, the volume-weighted average price ("VWAP") of the Issuer's common shares exceeds certain thresholds as follows: (a) one-half will vest if the VWAP of the Issuer's common shares exceeds $12.50 for any 20 trading days within any 30 trading day period, and (b) the remaining half will vest if the VWAP of the Issuer's common shares exceeds $15.00 for any 20 trading days within any 30 trading day period.

F1 · derivative.exercise_date: Reflects exchange of Class B common stock of Elk Creek Resources Corp ("Elk Class B Shares") exchanged for the Issuer's common shares on a one-for-one basis. Unvested Elk Class B Shares will vest if, from the closing of the Business Combination until the tenth anniversary thereof, the volume-weighted average price ("VWAP") of the Issuer's common shares exceeds certain thresholds as follows: (a) one-half will vest if the VWAP of the Issuer's common shares exceeds $12.50 for any 20 trading days within any 30 trading day period, and (b) the remaining half will vest if the VWAP of the Issuer's common shares exceeds $15.00 for any 20 trading days within any 30 trading day period.

F1 · derivative.expiration_date: Reflects exchange of Class B common stock of Elk Creek Resources Corp ("Elk Class B Shares") exchanged for the Issuer's common shares on a one-for-one basis. Unvested Elk Class B Shares will vest if, from the closing of the Business Combination until the tenth anniversary thereof, the volume-weighted average price ("VWAP") of the Issuer's common shares exceeds certain thresholds as follows: (a) one-half will vest if the VWAP of the Issuer's common shares exceeds $12.50 for any 20 trading days within any 30 trading day period, and (b) the remaining half will vest if the VWAP of the Issuer's common shares exceeds $15.00 for any 20 trading days within any 30 trading day period.

F3 · balance_after: Includes 239,996 unvested Elk Class B Shares.

SEC source: 0001539497-24-002706 · ownership.xml · nonDerivative · entry 1

Maselli Michael G. · CIK 0001614590 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 613,081

F1 · price: Reflects exchange of Class B common stock of Elk Creek Resources Corp ("Elk Class B Shares") exchanged for the Issuer's common shares on a one-for-one basis. Unvested Elk Class B Shares will vest if, from the closing of the Business Combination until the tenth anniversary thereof, the volume-weighted average price ("VWAP") of the Issuer's common shares exceeds certain thresholds as follows: (a) one-half will vest if the VWAP of the Issuer's common shares exceeds $12.50 for any 20 trading days within any 30 trading day period, and (b) the remaining half will vest if the VWAP of the Issuer's common shares exceeds $15.00 for any 20 trading days within any 30 trading day period.

SEC source: 0001539497-24-002414 · ownership.xml · derivative · entry 3

Smith Mark A. · CIK 0001496772 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 91,711

Underlying: Common Shares · 91,711 shares

Expires 2029-11-13

F2 · price: On November 13, 2023, the reporting person purchased 183,422 units (each, a "Unit") from NioCorp Developments Ltd. (the "Issuer") in a private placement. Each Unit consists of one common share, without par value (a "Common Share"), of the Issuer, one warrant to purchase one Common Share (a "Series A Warrant") and one-half of one warrant to purchase one Common Share (together with the series A Warrants, the "Warrants"). The price per Unit was $1.7675, which amount includes $0.125 per Warrant underlying each Unit.

F3 · derivative.exercise_date: Exercisable beginning six months and one day from the issue date on May 14, 2025.

SEC source: 0001539497-24-002414 · ownership.xml · derivative · entry 2

Smith Mark A. · CIK 0001496772 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 183,422

Underlying: Common Shares · 183,422 shares

Expires 2026-11-13

F2 · price: On November 13, 2023, the reporting person purchased 183,422 units (each, a "Unit") from NioCorp Developments Ltd. (the "Issuer") in a private placement. Each Unit consists of one common share, without par value (a "Common Share"), of the Issuer, one warrant to purchase one Common Share (a "Series A Warrant") and one-half of one warrant to purchase one Common Share (together with the series A Warrants, the "Warrants"). The price per Unit was $1.7675, which amount includes $0.125 per Warrant underlying each Unit.

F1 · derivative.exercise_date: Exercisable immediately on the issue date.

SEC source: 0001539497-24-002414 · ownership.xml · nonDerivative · entry 1

Smith Mark A. · CIK 0001496772 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,272,018

F1 · price: Exercisable immediately on the issue date.

SEC source: 0001539497-24-002413 · ownership.xml · derivative · entry 3

Kehler Dean C · CIK 0001322745 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 28,288

Underlying: Common Shares · 28,288 shares

Expires 2029-11-13

F2 · price: On November 13, 2023, the reporting person purchased 56,577 units (each, a "Unit") from NioCorp Developments Ltd. (the "Issuer") in a private placement. Each Unit consists of one common share, without par value (a "Common Share"), of the Issuer, one warrant to purchase one Common Share (a "Series A Warrant") and one-half of one warrant to purchase one Common Share (together with the Series A Warrants, the "Warrants"). The price per Unit was $1.7675, which amount includes $0.125 per Warrant underlying each Unit.

F3 · derivative.exercise_date: Exercisable beginning six months and one day from the issue date on May 14, 2025.

SEC source: 0001539497-24-002413 · ownership.xml · derivative · entry 2

Kehler Dean C · CIK 0001322745 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 56,577

Underlying: Common Shares · 56,577 shares

Expires 2026-11-13

F2 · price: On November 13, 2023, the reporting person purchased 56,577 units (each, a "Unit") from NioCorp Developments Ltd. (the "Issuer") in a private placement. Each Unit consists of one common share, without par value (a "Common Share"), of the Issuer, one warrant to purchase one Common Share (a "Series A Warrant") and one-half of one warrant to purchase one Common Share (together with the Series A Warrants, the "Warrants"). The price per Unit was $1.7675, which amount includes $0.125 per Warrant underlying each Unit.

F1 · derivative.exercise_date: Exercisable immediately on the issue date.

SEC source: 0001539497-24-002413 · ownership.xml · nonDerivative · entry 1

Kehler Dean C · CIK 0001322745 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 134,580

F1 · price: Exercisable immediately on the issue date.

SEC source: 0001539497-24-000512 · ownership.xml · derivative · entry 1

Guerrero-Mahon Nilsa · CIK 0001718789 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 75,000

Underlying: Common Shares · 75,000 shares

Expires 2029-02-15

SEC source: 0001539497-24-000513 · ownership.xml · derivative · entry 1

Honan Scott · CIK 0001688584 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 250,000

Underlying: Common Shares · 250,000 shares

Expires 2029-02-15

SEC source: 0001539497-24-000516 · ownership.xml · derivative · entry 1

Shah Neal S. · CIK 0001688494 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 250,000

Underlying: Common Shares · 250,000 shares

Expires 2029-02-15

SEC source: 0001539497-24-000518 · ownership.xml · derivative · entry 1

Sims James T. · CIK 0001688496 · Chief Communications Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 250,000

Underlying: Common Shares · 250,000 shares

Expires 2029-02-15

SEC source: 0001539497-24-000519 · ownership.xml · derivative · entry 1

Smith Mark A. · CIK 0001496772 · Director · President & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 750,000

Underlying: Common Shares · 375,000 shares

Expires 2029-02-15

SEC source: 0001539497-24-000514 · ownership.xml · derivative · entry 1

Kehler Dean C · CIK 0001322745 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 50,000

Underlying: Common Shares · 50,000 shares

Expires 2029-02-15

SEC source: 0001539497-24-000517 · ownership.xml · derivative · entry 1

Morris Michael James · CIK 0001335734 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 75,000

Underlying: Common Shares · 75,000 shares

Expires 2029-02-15

SEC source: 0001539497-24-000511 · ownership.xml · derivative · entry 1

BELING DAVID COATES · CIK 0001398069 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 50,000

Underlying: Common Shares · 50,000 shares

Expires 2029-02-15

SEC source: 0001539497-24-000515 · ownership.xml · derivative · entry 1

Oliver Peter Robert · CIK 0001930773 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 50,000

Underlying: Common Shares · 50,000 shares

Expires 2029-02-15

SEC source: 0001539497-24-000521 · ownership.xml · derivative · entry 1

Maselli Michael G. · CIK 0001614590 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 50,000

Underlying: Common Shares · 50,000 shares

Expires 2029-02-15