CENX

SEC source: 0000949157-22-000009 · wf-form4_164133257593721.xml · nonDerivative · entry 2

Hoffman Robert F · CIK 0001603836 · Principal Accounting Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 38,231

F3 · shares: Represents shares of common stock acquired by the Reporting Person upon the vesting of performance share units granted in connection with the Issuer's 2019-2021 Long-Term Incentive Plan under Rule 16b-3(d).

F2 · balance_after: Includes unvested time vesting units granted to the Reporting Person pursuant to Issuer's 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d).

SEC source: 0000949157-22-000009 · wf-form4_164133257593721.xml · nonDerivative · entry 1

Hoffman Robert F · CIK 0001603836 · Principal Accounting Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,255

F1 · shares: Reports shares withheld by the Issuer to satisfy tax obligations in connection with the vesting of time vesting share units granted to the Reporting Person.

F2 · balance_after: Includes unvested time vesting units granted to the Reporting Person pursuant to Issuer's 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d).

SEC source: 0000949157-22-000007 · wf-form4_164133136811221.xml · nonDerivative · entry 3

Conti Craig C · CIK 0001747814 · EVP & Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 114,851

F4 · shares: Reports shares withheld by the Issuer to satisfy tax obligations in connection with the vesting of performance share units granted to the Reporting Person.

F2 · balance_after: Includes unvested time vesting units granted to the Reporting Person pursuant to Issuer's 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d).

SEC source: 0000949157-22-000007 · wf-form4_164133136811221.xml · nonDerivative · entry 2

Conti Craig C · CIK 0001747814 · EVP & Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 136,318

F3 · shares: Represents shares of common stock acquired by the Reporting Person upon the vesting of performance share units granted in connection with the Issuer's 2019-2021 Long-Term Incentive Plan under Rule 16b-3(d).

F2 · balance_after: Includes unvested time vesting units granted to the Reporting Person pursuant to Issuer's 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d).

SEC source: 0000949157-22-000007 · wf-form4_164133136811221.xml · nonDerivative · entry 1

Conti Craig C · CIK 0001747814 · EVP & Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 87,860

F1 · shares: Reports shares withheld by the Issuer to satisfy tax obligations in connection with the vesting of time vesting share units granted to the Reporting Person.

F2 · balance_after: Includes unvested time vesting units granted to the Reporting Person pursuant to Issuer's 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d).

SEC source: 0000949157-22-000005 · wf-form4_164133101565395.xml · nonDerivative · entry 3

Gudlaugsson Gunnar · CIK 0001846594 · EVP - Global Operations

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 29,860

F4 · shares: Reports shares withheld by the Issuer to satisfy tax obligations in connection with the vesting of performance share units granted to the Reporting Person.

F2 · balance_after: Includes unvested time vesting units granted to the Reporting Person pursuant to Issuer's 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d).

SEC source: 0000949157-22-000005 · wf-form4_164133101565395.xml · nonDerivative · entry 2

Gudlaugsson Gunnar · CIK 0001846594 · EVP - Global Operations

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 35,159

F3 · shares: Represents shares of common stock acquired by the Reporting Person upon the vesting of performance share units granted in connection with the Issuer's 2019-2021 Long-Term Incentive Plan under Rule 16b-3(d).

F2 · balance_after: Includes unvested time vesting units granted to the Reporting Person pursuant to Issuer's 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d).

SEC source: 0000949157-22-000005 · wf-form4_164133101565395.xml · nonDerivative · entry 1

Gudlaugsson Gunnar · CIK 0001846594 · EVP - Global Operations

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 24,676

F1 · shares: Reports shares withheld by the Issuer to satisfy tax obligations in connection with the vesting of time vesting share units granted to the Reporting Person.

F2 · balance_after: Includes unvested time vesting units granted to the Reporting Person pursuant to Issuer's 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d).

SEC source: 0001104659-22-000613 · tm221440d1_4.xml · derivative · entry 2

Glencore AG · CIK 0001449539 · 10% owner

GLENCORE INTERNATIONAL AG · CIK 0001032383 · 10% owner

Glencore plc · CIK 0001521365 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 58,542.43

Underlying: Common Stock · 473,131 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Each share of Series A Convertible Preferred Stock is convertible into 100 shares of Common Stock at the times and under the circumstances described in the Certificate of Designation for the Series A Convertible Preferred Stock. The Series A Convertible Preferred Stock has no expiration date.

F2 · price: Each share of Series A Convertible Preferred Stock is convertible into 100 shares of Common Stock at the times and under the circumstances described in the Certificate of Designation for the Series A Convertible Preferred Stock. The Series A Convertible Preferred Stock has no expiration date.

F2 · derivative.exercise_date: Each share of Series A Convertible Preferred Stock is convertible into 100 shares of Common Stock at the times and under the circumstances described in the Certificate of Designation for the Series A Convertible Preferred Stock. The Series A Convertible Preferred Stock has no expiration date.

F2 · derivative.expiration_date: Each share of Series A Convertible Preferred Stock is convertible into 100 shares of Common Stock at the times and under the circumstances described in the Certificate of Designation for the Series A Convertible Preferred Stock. The Series A Convertible Preferred Stock has no expiration date.

F3 · ownership.direct: The shares of Common Stock reported in Table I and the shares of Series A Convertible Preferred Stock reported in Table II are held directly by Glencore AG, a direct wholly-owned subsidiary of Glencore International AG, and indirectly by Glencore International AG and its parent, Glencore plc.

SEC source: 0001104659-22-000613 · tm221440d1_4.xml · nonDerivative · entry 1

Glencore AG · CIK 0001449539 · 10% owner

GLENCORE INTERNATIONAL AG · CIK 0001032383 · 10% owner

Glencore plc · CIK 0001521365 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,651,704

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Represents shares of Common Stock acquired upon conversion of 4,731.31 shares of Series A Convertible Preferred Stock on December 31, 2021.

F2 · price: Each share of Series A Convertible Preferred Stock is convertible into 100 shares of Common Stock at the times and under the circumstances described in the Certificate of Designation for the Series A Convertible Preferred Stock. The Series A Convertible Preferred Stock has no expiration date.

F3 · ownership.direct: The shares of Common Stock reported in Table I and the shares of Series A Convertible Preferred Stock reported in Table II are held directly by Glencore AG, a direct wholly-owned subsidiary of Glencore International AG, and indirectly by Glencore International AG and its parent, Glencore plc.

SEC source: 0000949157-21-000142 · wf-form4_163899909632526.xml · nonDerivative · entry 1

Bush Jennifer Mary · CIK 0001897517 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 7,841

F1 · shares: Grant of time-vesting share units made to the Reporting Person on December 6, 2021, pursuant to Rule 16b-3(d) plan, all of which vest on the date of the next regular annual meeting of the Issuer's stockholders or earlier upon occurrence of certain other events.

SEC source: 0000949157-21-000111 · wf-form4_162525805573751.xml · nonDerivative · entry 1

Gary Jesse E · CIK 0001568817 · Director · President & CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 332,732

F1 · shares: Represents awards granted to the Reporting Person consisting of (i) 13,740 time vesting share units under the Issuer's 2021-2023 Long-Term Incentive Plan under Rule 16b-3(d), all of which will vest in the ordinary course on the last day of the Plan Period, December 31, 2023 and (ii) 157,536 time vesting share units, 78,768 of which vest in the ordinary course on July 1, 2022, 47,261 of which vest in the ordinary course on July 1, 2023 and 31,507 of which vest in the ordinary course on July 1, 2024.

F2 · balance_after: Includes unvested time vesting share units granted to the Reporting Person (i) pursuant to Issuer's 2019-2021, 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d) and (ii) 157,536 time vesting share units, 78,768 of which vest in the ordinary course on July 1, 2022, 47,261 of which vest in the ordinary course on July 1, 2023 and 31,507 of which vest in the ordinary course on July 1, 2024.

SEC source: 0001104659-21-088084 · tm2121229d1_4.xml · derivative · entry 2

Glencore AG · CIK 0001449539 · 10% owner

GLENCORE INTERNATIONAL AG · CIK 0001032383 · 10% owner

Glencore plc · CIK 0001521365 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 63,273.74

Underlying: Common Stock · 17,768 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Each share of Series A Convertible Preferred Stock is convertible into 100 shares of Common Stock at the times and under the circumstances described in the Certificate of Designation for the Series A Convertible Preferred Stock. The Series A Convertible Preferred Stock has no expiration date.

F2 · price: Each share of Series A Convertible Preferred Stock is convertible into 100 shares of Common Stock at the times and under the circumstances described in the Certificate of Designation for the Series A Convertible Preferred Stock. The Series A Convertible Preferred Stock has no expiration date.

F2 · derivative.exercise_date: Each share of Series A Convertible Preferred Stock is convertible into 100 shares of Common Stock at the times and under the circumstances described in the Certificate of Designation for the Series A Convertible Preferred Stock. The Series A Convertible Preferred Stock has no expiration date.

F2 · derivative.expiration_date: Each share of Series A Convertible Preferred Stock is convertible into 100 shares of Common Stock at the times and under the circumstances described in the Certificate of Designation for the Series A Convertible Preferred Stock. The Series A Convertible Preferred Stock has no expiration date.

F3 · ownership.direct: The shares of Common Stock reported in Table I and the shares of Series A Convertible Preferred Stock reported in Table II are held directly by Glencore AG, a direct wholly-owned subsidiary of Glencore International AG, and indirectly by Glencore International AG and its parent, Glencore plc.

SEC source: 0001104659-21-088084 · tm2121229d1_4.xml · nonDerivative · entry 1

Glencore AG · CIK 0001449539 · 10% owner

GLENCORE INTERNATIONAL AG · CIK 0001032383 · 10% owner

Glencore plc · CIK 0001521365 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,178,573

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Represents shares of Common Stock acquired upon conversion of 177.68 shares of Series A Convertible Preferred Stock on June 30, 2021.

F2 · price: Each share of Series A Convertible Preferred Stock is convertible into 100 shares of Common Stock at the times and under the circumstances described in the Certificate of Designation for the Series A Convertible Preferred Stock. The Series A Convertible Preferred Stock has no expiration date.

F3 · ownership.direct: The shares of Common Stock reported in Table I and the shares of Series A Convertible Preferred Stock reported in Table II are held directly by Glencore AG, a direct wholly-owned subsidiary of Glencore International AG, and indirectly by Glencore International AG and its parent, Glencore plc.

SEC source: 0000949157-21-000106 · wf-form4_162388537260020.xml · nonDerivative · entry 1

Berntzen Jarl · CIK 0001355035 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 169,920

F1 · shares: Time-vesting share units granted to the Reporting Person on June 15, 2021 pursuant to a Rule 16b-3(d) plan representing the annual grant of service based time-vesting share units made to directors which vest on the one year anniversary of the grant date or earlier upon the occurrence of certain other events.

F2 · balance_after: Includes deferred time-vesting share units to the Reporting Person in connection with previous annual grants of time-vesting share units made to the Reporting Person pursuant to a Rule 16b-3(d) plan.

SEC source: 0000949157-21-000104 · wf-form4_162388500283144.xml · nonDerivative · entry 1

GLASSER ERROL · CIK 0001203889 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 79,666

F1 · shares: Annual grant of service based time-vesting share units made to directors on June 15, 2021 pursuant to Rule 16b-3(d) plan, all of which vest immediately.

F2 · shares: Settlement of the time-vesting share units has been deferred until the termination of the Reporting Person's service as a director of the Company.

F3 · balance_after: Includes deferred time-vesting share units to the Reporting Person in connection with previous annual grants of time-vesting share units made to the Reporting Person pursuant to a Rule 16b-3(d) plan.

SEC source: 0000949157-21-000102 · wf-form4_162388466171749.xml · nonDerivative · entry 2

Michelmore Andrew G · CIK 0001493775 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 61,768

F2 · shares: Represents shares withheld by the Issuer in connection with the vesting of grant of time-vesting share units made to the Reporting Person pursuant to a Rule 16b-3(d) plan to satisfy tax obligations at a net settlement price equal to the closing price on Nasdaq on June 15, 2021, the vesting date.

SEC source: 0000949157-21-000102 · wf-form4_162388466171749.xml · nonDerivative · entry 1

Michelmore Andrew G · CIK 0001493775 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 64,089

F1 · shares: Annual grant of service based time-vesting share units made to directors on June 15, 2021, pursuant to Rule 16b-3(d) plan, all of which vest immediately.

SEC source: 0000949157-21-000100 · wf-form4_162379964171784.xml · nonDerivative · entry 1

DeZee John · CIK 0001863198 · EVP, GC & SECRETARY

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 41,966

F1 · shares: Represents time vesting share units granted to the Reporting Person in connection with the Issuer's 2021-2023 Long-Term Incentive Plan under Rule 16b-3(d), all of which will vest in the ordinary course on the last day of the Plan Period, December 31, 2023.

F2 · balance_after: Includes unvested time vesting share units granted to the Reporting Person pursuant to Issuer's 2019-2021, 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d).

SEC source: 0000949157-21-000098 · wf-form4_162379915403308.xml · nonDerivative · entry 1

Aboud Matt · CIK 0001863408 · SVP, Strategy & Business Dev't

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,809

F1 · shares: Represents time vesting share units granted to the Reporting Person in connection with the Issuer's 2021-2023 Long-Term Incentive Plan under Rule 16b-3(d), all of which will vest in the ordinary course on the last day of the Plan Period, December 31, 2023.

F2 · balance_after: Includes unvested time vesting share units granted to the Reporting Person pursuant to Issuer's 2021-2023 Long-Term Incentive Plan under Rule 16b-3(d).

SEC source: 0001104659-21-064090 · tm2115830d1_4.xml · derivative · entry 1

GLENCORE INTERNATIONAL AG · CIK 0001032383 · 10% owner

Glencore plc · CIK 0001521365 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 4,400,000 shares

Expires not disclosed

F1 · derivative.exercise_price: Glencore International AG ("Glencore International"), a direct wholly-owned subsidiary of Glencore plc, previously received economic exposure with respect to 4,400,000 shares of common stock pursuant to a cash-settled total return swap (the "Swap") entered into between Glencore International and Citigroup Global Markets Inc. (together with its successors in interest under the Swap, "Citi"), with an initial expiration date of March 11, 2013 (subsequently extended to April 17, 2021).

F2 · derivative.exercise_price: Upon expiration of the Swap, (i) Glencore International is obligated to make a cash payment to Citi with respect to any depreciation in the volume weighted average price of the common stock from the $16.6582 per share volume weighted average price calculated during the initial averaging period for the Swap in March 2011 to the volume weighted average price of the common stock during the final valuation period at the expiration of the term of the Swap, or (ii) Citi is obligated to make a cash payment to Glencore International with respect to any appreciation in such volume weighted average price during the same period.

F4 · derivative.exercise_price: On April 17, 2021 the Swap expired in accordance with its terms and a net settlement amount of $4,039,728 (equal to the difference between (i) a final valuation amount based on the volume weighted average price of the common stock during a final valuation period ending on May 7, 2021, and (ii) the original valuation amount equal to the per share initial reference price of $16.6582 multiplied by the 4,400,000 shares referenced by the Swap), became due from Glencore International to Citi.

F4 · date: On April 17, 2021 the Swap expired in accordance with its terms and a net settlement amount of $4,039,728 (equal to the difference between (i) a final valuation amount based on the volume weighted average price of the common stock during a final valuation period ending on May 7, 2021, and (ii) the original valuation amount equal to the per share initial reference price of $16.6582 multiplied by the 4,400,000 shares referenced by the Swap), became due from Glencore International to Citi.

F1 · price: Glencore International AG ("Glencore International"), a direct wholly-owned subsidiary of Glencore plc, previously received economic exposure with respect to 4,400,000 shares of common stock pursuant to a cash-settled total return swap (the "Swap") entered into between Glencore International and Citigroup Global Markets Inc. (together with its successors in interest under the Swap, "Citi"), with an initial expiration date of March 11, 2013 (subsequently extended to April 17, 2021).

F2 · price: Upon expiration of the Swap, (i) Glencore International is obligated to make a cash payment to Citi with respect to any depreciation in the volume weighted average price of the common stock from the $16.6582 per share volume weighted average price calculated during the initial averaging period for the Swap in March 2011 to the volume weighted average price of the common stock during the final valuation period at the expiration of the term of the Swap, or (ii) Citi is obligated to make a cash payment to Glencore International with respect to any appreciation in such volume weighted average price during the same period.

F3 · price: Under the terms of the Swap, generally, Glencore International was obligated to pay to Citi certain fees and commissions and Citi was obligated to pay to Glencore International an amount in cash equal to any dividends that would have been paid by the issuer on the number of shares referenced by the Swap.

F4 · price: On April 17, 2021 the Swap expired in accordance with its terms and a net settlement amount of $4,039,728 (equal to the difference between (i) a final valuation amount based on the volume weighted average price of the common stock during a final valuation period ending on May 7, 2021, and (ii) the original valuation amount equal to the per share initial reference price of $16.6582 multiplied by the 4,400,000 shares referenced by the Swap), became due from Glencore International to Citi.

F1 · derivative.exercise_date: Glencore International AG ("Glencore International"), a direct wholly-owned subsidiary of Glencore plc, previously received economic exposure with respect to 4,400,000 shares of common stock pursuant to a cash-settled total return swap (the "Swap") entered into between Glencore International and Citigroup Global Markets Inc. (together with its successors in interest under the Swap, "Citi"), with an initial expiration date of March 11, 2013 (subsequently extended to April 17, 2021).

F2 · derivative.exercise_date: Upon expiration of the Swap, (i) Glencore International is obligated to make a cash payment to Citi with respect to any depreciation in the volume weighted average price of the common stock from the $16.6582 per share volume weighted average price calculated during the initial averaging period for the Swap in March 2011 to the volume weighted average price of the common stock during the final valuation period at the expiration of the term of the Swap, or (ii) Citi is obligated to make a cash payment to Glencore International with respect to any appreciation in such volume weighted average price during the same period.

F4 · derivative.exercise_date: On April 17, 2021 the Swap expired in accordance with its terms and a net settlement amount of $4,039,728 (equal to the difference between (i) a final valuation amount based on the volume weighted average price of the common stock during a final valuation period ending on May 7, 2021, and (ii) the original valuation amount equal to the per share initial reference price of $16.6582 multiplied by the 4,400,000 shares referenced by the Swap), became due from Glencore International to Citi.

F1 · derivative.expiration_date: Glencore International AG ("Glencore International"), a direct wholly-owned subsidiary of Glencore plc, previously received economic exposure with respect to 4,400,000 shares of common stock pursuant to a cash-settled total return swap (the "Swap") entered into between Glencore International and Citigroup Global Markets Inc. (together with its successors in interest under the Swap, "Citi"), with an initial expiration date of March 11, 2013 (subsequently extended to April 17, 2021).

F2 · derivative.expiration_date: Upon expiration of the Swap, (i) Glencore International is obligated to make a cash payment to Citi with respect to any depreciation in the volume weighted average price of the common stock from the $16.6582 per share volume weighted average price calculated during the initial averaging period for the Swap in March 2011 to the volume weighted average price of the common stock during the final valuation period at the expiration of the term of the Swap, or (ii) Citi is obligated to make a cash payment to Glencore International with respect to any appreciation in such volume weighted average price during the same period.

F4 · derivative.expiration_date: On April 17, 2021 the Swap expired in accordance with its terms and a net settlement amount of $4,039,728 (equal to the difference between (i) a final valuation amount based on the volume weighted average price of the common stock during a final valuation period ending on May 7, 2021, and (ii) the original valuation amount equal to the per share initial reference price of $16.6582 multiplied by the 4,400,000 shares referenced by the Swap), became due from Glencore International to Citi.

F1 · derivative.underlying_shares: Glencore International AG ("Glencore International"), a direct wholly-owned subsidiary of Glencore plc, previously received economic exposure with respect to 4,400,000 shares of common stock pursuant to a cash-settled total return swap (the "Swap") entered into between Glencore International and Citigroup Global Markets Inc. (together with its successors in interest under the Swap, "Citi"), with an initial expiration date of March 11, 2013 (subsequently extended to April 17, 2021).

F2 · derivative.underlying_shares: Upon expiration of the Swap, (i) Glencore International is obligated to make a cash payment to Citi with respect to any depreciation in the volume weighted average price of the common stock from the $16.6582 per share volume weighted average price calculated during the initial averaging period for the Swap in March 2011 to the volume weighted average price of the common stock during the final valuation period at the expiration of the term of the Swap, or (ii) Citi is obligated to make a cash payment to Glencore International with respect to any appreciation in such volume weighted average price during the same period.

F1 · balance_after: Glencore International AG ("Glencore International"), a direct wholly-owned subsidiary of Glencore plc, previously received economic exposure with respect to 4,400,000 shares of common stock pursuant to a cash-settled total return swap (the "Swap") entered into between Glencore International and Citigroup Global Markets Inc. (together with its successors in interest under the Swap, "Citi"), with an initial expiration date of March 11, 2013 (subsequently extended to April 17, 2021).

F2 · balance_after: Upon expiration of the Swap, (i) Glencore International is obligated to make a cash payment to Citi with respect to any depreciation in the volume weighted average price of the common stock from the $16.6582 per share volume weighted average price calculated during the initial averaging period for the Swap in March 2011 to the volume weighted average price of the common stock during the final valuation period at the expiration of the term of the Swap, or (ii) Citi is obligated to make a cash payment to Glencore International with respect to any appreciation in such volume weighted average price during the same period.

F4 · balance_after: On April 17, 2021 the Swap expired in accordance with its terms and a net settlement amount of $4,039,728 (equal to the difference between (i) a final valuation amount based on the volume weighted average price of the common stock during a final valuation period ending on May 7, 2021, and (ii) the original valuation amount equal to the per share initial reference price of $16.6582 multiplied by the 4,400,000 shares referenced by the Swap), became due from Glencore International to Citi.

F1 · ownership.direct: Glencore International AG ("Glencore International"), a direct wholly-owned subsidiary of Glencore plc, previously received economic exposure with respect to 4,400,000 shares of common stock pursuant to a cash-settled total return swap (the "Swap") entered into between Glencore International and Citigroup Global Markets Inc. (together with its successors in interest under the Swap, "Citi"), with an initial expiration date of March 11, 2013 (subsequently extended to April 17, 2021).

F5 · ownership.direct: The Swap was held directly by Glencore International, and may be deemed to have been beneficially owned indirectly by Glencore plc. The Swap did not give the reporting persons direct or indirect voting, investment or dispositive control over any securities of the issuer, and accordingly, the reporting persons disclaim any beneficial ownership in the shares of common stock referenced by the swaps.

SEC source: 0001104659-21-045284 · tm2111862d1_4.xml · derivative · entry 2

Glencore AG · CIK 0001449539 · 10% owner

GLENCORE INTERNATIONAL AG · CIK 0001032383 · 10% owner

Glencore plc · CIK 0001521365 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 63,451.42

Underlying: Common Stock · 13,697 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: Each share of Series A Convertible Preferred Stock is convertible into 100 shares of Common Stock at the times and under the circumstances described in the Certificate of Designation for the Series A Convertible Preferred Stock. The Series A Convertible Preferred Stock has no expiration date.

F2 · price: Each share of Series A Convertible Preferred Stock is convertible into 100 shares of Common Stock at the times and under the circumstances described in the Certificate of Designation for the Series A Convertible Preferred Stock. The Series A Convertible Preferred Stock has no expiration date.

F2 · derivative.exercise_date: Each share of Series A Convertible Preferred Stock is convertible into 100 shares of Common Stock at the times and under the circumstances described in the Certificate of Designation for the Series A Convertible Preferred Stock. The Series A Convertible Preferred Stock has no expiration date.

F2 · derivative.expiration_date: Each share of Series A Convertible Preferred Stock is convertible into 100 shares of Common Stock at the times and under the circumstances described in the Certificate of Designation for the Series A Convertible Preferred Stock. The Series A Convertible Preferred Stock has no expiration date.

F3 · ownership.direct: The shares of Common Stock reported in Table I and the shares of Series A Convertible Preferred Stock reported in Table II are held directly by Glencore AG, a direct wholly-owned subsidiary of Glencore International AG, and indirectly by Glencore International AG and its parent, Glencore plc.

SEC source: 0001104659-21-045284 · tm2111862d1_4.xml · nonDerivative · entry 1

Glencore AG · CIK 0001449539 · 10% owner

GLENCORE INTERNATIONAL AG · CIK 0001032383 · 10% owner

Glencore plc · CIK 0001521365 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,160,805

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Represents shares of Common Stock acquired upon conversion of 136.97 shares of Series A Convertible Preferred Stock on March 31, 2021.

F2 · price: Each share of Series A Convertible Preferred Stock is convertible into 100 shares of Common Stock at the times and under the circumstances described in the Certificate of Designation for the Series A Convertible Preferred Stock. The Series A Convertible Preferred Stock has no expiration date.

F3 · ownership.direct: The shares of Common Stock reported in Table I and the shares of Series A Convertible Preferred Stock reported in Table II are held directly by Glencore AG, a direct wholly-owned subsidiary of Glencore International AG, and indirectly by Glencore International AG and its parent, Glencore plc.

SEC source: 0000949157-21-000047 · wf-form4_161497924883578.xml · nonDerivative · entry 1

Gudlaugsson Gunnar · CIK 0001846594 · EVP - Global Operations

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 27,140

F1 · balance_after: Includes unvested time vesting share units granted to the Reporting Person pursuant to Issuer's 2019-2021, 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d).

SEC source: 0000949157-21-000045 · wf-form4_161497885447362.xml · nonDerivative · entry 1

BLESS MICHAEL A · CIK 0001204903 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 353,989

F1 · price: This transaction was executed in multiple trades at prices ranging from $17.39 to $17.82. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

F2 · balance_after: Includes unvested time vesting share units granted to the Reporting Person pursuant to Issuer's 2019-2021, 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d).

SEC source: 0000949157-21-000036 · wf-form4_161480813500612.xml · nonDerivative · entry 3

BLESS MICHAEL A · CIK 0001204903 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 368,989

F4 · price: This transaction was executed in multiple trades at prices ranging from $16.25 to $16.62. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

F2 · balance_after: Includes unvested time vesting share units granted to the Reporting Person pursuant to Issuer's 2019-2021, 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d).

SEC source: 0000949157-21-000036 · wf-form4_161480813500612.xml · nonDerivative · entry 2

BLESS MICHAEL A · CIK 0001204903 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 378,989

F3 · price: This transaction was executed in multiple trades at prices ranging from $16.15 to $16.75. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

F2 · balance_after: Includes unvested time vesting share units granted to the Reporting Person pursuant to Issuer's 2019-2021, 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d).

SEC source: 0000949157-21-000036 · wf-form4_161480813500612.xml · nonDerivative · entry 1

BLESS MICHAEL A · CIK 0001204903 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 403,989

F1 · price: This transaction was executed in multiple trades at prices ranging from $14.38 to $14.45. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

F2 · balance_after: Includes unvested time vesting share units granted to the Reporting Person pursuant to Issuer's 2019-2021, 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d).

SEC source: 0000949157-21-000038 · wf-form4_161480849860432.xml · nonDerivative · entry 1

Gary Jesse E · CIK 0001568817 · EVP, COO, GC & Secretary

10b5-1 filing: Not disclosed

Ownership: Indirect · By Trust

Disclosed balance after: 64,400

F1 · price: This transaction was executed in multiple trades at prices ranging from $14.26 to $14.44. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

F2 · balance_after: Represents shares transferred by the Reporting Person to a self-settled, revocable trust for estate planning purposes. The Reporting Person serves as the trustee of the trust.

SEC source: 0000949157-21-000033 · wf-form4_161437551041006.xml · nonDerivative · entry 3

Gary Jesse E · CIK 0001568817 · EVP, COO & GC

10b5-1 filing: Not disclosed

Ownership: Indirect · By Trust

Disclosed balance after: 75,770

F3 · price: This transaction was executed in multiple trades at prices ranging from $14.75 to $15.17. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

F1 · balance_after: Represents shares transferred by the Reporting Person to a self-settled, revocable trust for estate planning purposes. The Reporting Person serves as the trustee of the trust.

SEC source: 0000949157-21-000031 · wf-form4_161437522908370.xml · nonDerivative · entry 3

BLESS MICHAEL A · CIK 0001204903 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 411,489

F4 · price: This transaction was executed in multiple trades at prices ranging from $14.73 to $15.23. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

F2 · balance_after: Includes unvested time vesting units granted to the Reporting Person pursuant to Issuer's 2019-2021, 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d).

SEC source: 0000949157-21-000034 · wf-form4_161437563760356.xml · nonDerivative · entry 1

Harrison Michelle · CIK 0001365895 · Sr. VP Finance & Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 72,734

F1 · price: This transaction was executed in multiple trades at prices ranging from $15.50 to $15.57. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

F2 · balance_after: Includes unvested time vesting units granted to the Reporting Person pursuant to Issuer's 2019-2021, 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d).

SEC source: 0000949157-21-000031 · wf-form4_161437522908370.xml · nonDerivative · entry 2

BLESS MICHAEL A · CIK 0001204903 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 426,489

F3 · price: This transaction was executed in multiple trades at prices ranging from $15.00 to $15.44. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

F2 · balance_after: Includes unvested time vesting units granted to the Reporting Person pursuant to Issuer's 2019-2021, 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d).

SEC source: 0000949157-21-000031 · wf-form4_161437522908370.xml · nonDerivative · entry 1

BLESS MICHAEL A · CIK 0001204903 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 441,489

F1 · price: This transaction was executed in multiple trades at prices ranging from $14.515 to $15.085. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

F2 · balance_after: Includes unvested time vesting units granted to the Reporting Person pursuant to Issuer's 2019-2021, 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d).

SEC source: 0000949157-21-000030 · wf-form4_161420182278291.xml · nonDerivative · entry 1

BLESS MICHAEL A · CIK 0001204903 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 466,489

F1 · price: This transaction was executed in multiple trades at prices ranging from $14.21 to $14.47. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

F2 · balance_after: Includes unvested time vesting units granted to the Reporting Person pursuant to Issuer's 2019-2021, 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d).

SEC source: 0000949157-21-000028 · wf-form4_161368319343027.xml · nonDerivative · entry 1

Gudlaugsson Gunnar · CIK 0001846594 · EVP - Global Operations

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 32,613

F1 · shares: Represents time vesting share units granted to the Reporting Person in connection with the Issuer's 2021-2023 Long-Term Incentive Plan under Rule 16b-3(d), all of which will vest in the ordinary course on the last day of the Plan Period, December 31, 2023.

F2 · balance_after: Includes unvested time vesting share units granted to the Reporting Person pursuant to Issuer's 2019-2021, 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d).

SEC source: 0000949157-21-000033 · wf-form4_161437551041006.xml · nonDerivative · entry 2

Gary Jesse E · CIK 0001568817 · EVP, COO & GC

10b5-1 filing: Not disclosed

Ownership: Indirect · By Trust

Disclosed balance after: 91,224

F1 · shares: Represents shares transferred by the Reporting Person to a self-settled, revocable trust for estate planning purposes. The Reporting Person serves as the trustee of the trust.

F1 · balance_after: Represents shares transferred by the Reporting Person to a self-settled, revocable trust for estate planning purposes. The Reporting Person serves as the trustee of the trust.

SEC source: 0000949157-21-000033 · wf-form4_161437551041006.xml · nonDerivative · entry 1

Gary Jesse E · CIK 0001568817 · EVP, COO & GC

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 161,456

F1 · shares: Represents shares transferred by the Reporting Person to a self-settled, revocable trust for estate planning purposes. The Reporting Person serves as the trustee of the trust.

F2 · balance_after: Includes unvested time vesting share units granted to the Reporting Person pursuant to Issuer's 2019-2021, 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d).

SEC source: 0000949157-21-000010 · wf-form4_160988579669459.xml · nonDerivative · entry 4

Harrison Michelle · CIK 0001365895 · Sr. VP Finance & Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 81,965

F5 · shares: Represents time vesting share units granted to the Reporting Person in connection with the Issuer's 2021-2023 Long-Term Incentive Plan under Rule 16b-3(d), all of which will vest in the ordinary course on the last day of the Plan Period, December 31, 2023.

F6 · balance_after: Includes unvested time vesting units granted to the Reporting Person pursuant to Issuer's 2019-2021, 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d).

SEC source: 0000949157-21-000008 · wf-form4_160988537578412.xml · nonDerivative · entry 4

Hoerner John E. · CIK 0001529248 · EVP - N. American Operations

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 198,271

F5 · shares: Represents time vesting share units granted to the Reporting Person in connection with the Issuer's 2021-2023 Long-Term Incentive Plan under Rule 16b-3(d), all of which will vest in the ordinary course on the last day of the Plan Period, December 31, 2023.

F6 · balance_after: Includes unvested time vesting share units granted to the Reporting Person pursuant to Issuer's 2019-2021, 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d).

SEC source: 0000949157-21-000004 · wf-form4_160988476116347.xml · nonDerivative · entry 4

Gary Jesse E · CIK 0001568817 · EVP, COO & GC

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 204,656

F5 · shares: Represents time vesting share units granted to the Reporting Person in connection with the Issuer's 2021-2023 Long-Term Incentive Plan under Rule 16b-3(d), all of which will vest in the ordinary course on the last day of the Plan Period, December 31, 2023.

F6 · balance_after: Includes unvested time vesting share units granted to the Reporting Person pursuant to Issuer's 2019-2021, 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d).

SEC source: 0000949157-21-000006 · wf-form4_160988508175750.xml · nonDerivative · entry 4

Conti Craig C · CIK 0001747814 · EVP & Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 97,840

F5 · shares: Represents time vesting share units granted to the Reporting Person in connection with the Issuer's 2021-2023 Long-Term Incentive Plan under Rule 16b-3(d), all of which will vest in the ordinary course on the last day of the Plan Period, December 31, 2023.

F6 · balance_after: Includes unvested time vesting share units granted to the Reporting Person pursuant to Issuer's 2019-2021, 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d).

SEC source: 0000949157-21-000002 · wf-form4_160988397088547.xml · nonDerivative · entry 4

BLESS MICHAEL A · CIK 0001204903 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 478,989

F5 · shares: Represents time vesting share units granted to the Reporting Person in connection with the Issuer's 2021-2023 Long-Term Incentive Plan under Rule 16b-3(d), all of which will vest in the ordinary course on the last day of the Plan Period, December 31, 2023.

F6 · balance_after: Includes unvested time vesting units granted to the Reporting Person pursuant to Issuer's 2019-2021, 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d).

SEC source: 0000949157-21-000012 · wf-form4_160988617039335.xml · nonDerivative · entry 1

Indriani Elisabeth · CIK 0001751475 · Principal Accounting Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 32,099

F1 · shares: Reports shares withheld by the Issuer to satisfy tax obligations in connection with the vesting of time vesting share units granted to the Reporting Person.

F2 · balance_after: Includes unvested time vesting share units granted to the Reporting Person pursuant to Issuer's 2019-2021 and 2020-2022 Long-Term Incentive Plan under Rule 16b-3(d).

SEC source: 0000949157-21-000010 · wf-form4_160988579669459.xml · nonDerivative · entry 3

Harrison Michelle · CIK 0001365895 · Sr. VP Finance & Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 75,874

F4 · shares: Reports shares withheld by the Issuer to satisfy tax obligations in connection with the vesting of performance share units granted to the Reporting Person.

F2 · balance_after: Includes unvested time vesting units granted to the Reporting Person pursuant to Issuer's 2019-2021 and 2020-2022 Long-Term Incentive Plans under Rule 16b-3(d).

SEC source: 0000949157-21-000010 · wf-form4_160988579669459.xml · nonDerivative · entry 2

Harrison Michelle · CIK 0001365895 · Sr. VP Finance & Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 81,375

F3 · shares: Represents shares of common stock acquired by the Reporting Person upon the vesting of performance share units granted in connection with the Issuer's 2018-2020 Long-Term Incentive Plan under Rule16b-3(d).

F2 · balance_after: Includes unvested time vesting units granted to the Reporting Person pursuant to Issuer's 2019-2021 and 2020-2022 Long-Term Incentive Plans under Rule 16b-3(d).

SEC source: 0000949157-21-000010 · wf-form4_160988579669459.xml · nonDerivative · entry 1

Harrison Michelle · CIK 0001365895 · Sr. VP Finance & Treasurer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 70,281

F1 · shares: Reports shares withheld by the Issuer to satisfy tax obligations in connection with the vesting of time vesting share units granted to the Reporting Person.

F2 · balance_after: Includes unvested time vesting units granted to the Reporting Person pursuant to Issuer's 2019-2021 and 2020-2022 Long-Term Incentive Plans under Rule 16b-3(d).

SEC source: 0000949157-21-000008 · wf-form4_160988537578412.xml · nonDerivative · entry 3

Hoerner John E. · CIK 0001529248 · EVP - N. American Operations

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 178,058

F4 · shares: Reports shares withheld by the Issuer to satisfy tax obligations in connection with the vesting of performance share units granted to the Reporting Person.

F2 · balance_after: Includes unvested time vesting share units granted to the Reporting Person pursuant to Issuer's 2019-2021 and 2020-2022 Long-Term Incentive Plans under Rule 16b-3(d).

SEC source: 0000949157-21-000008 · wf-form4_160988537578412.xml · nonDerivative · entry 2

Hoerner John E. · CIK 0001529248 · EVP - N. American Operations

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 194,125

F3 · shares: Represents shares of common stock acquired by the Reporting Person upon the vesting of performance share units granted in connection with the Issuer's 2018-2020 Long-Term Incentive Plan under Rule 16b-3(d).

F2 · balance_after: Includes unvested time vesting share units granted to the Reporting Person pursuant to Issuer's 2019-2021 and 2020-2022 Long-Term Incentive Plans under Rule 16b-3(d).

SEC source: 0000949157-21-000008 · wf-form4_160988537578412.xml · nonDerivative · entry 1

Hoerner John E. · CIK 0001529248 · EVP - N. American Operations

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 156,392

F1 · shares: Reports shares withheld by the Issuer to satisfy tax obligations in connection with the vesting of time vesting share units granted to the Reporting Person.

F2 · balance_after: Includes unvested time vesting share units granted to the Reporting Person pursuant to Issuer's 2019-2021 and 2020-2022 Long-Term Incentive Plans under Rule 16b-3(d).