HYMC

SEC source: 0001718405-20-000011 · wf-form4_160824741508903.xml · derivative · entry 5

GARRETT DIANE R · CIK 0001170429 · President, CEO & Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 34,966

Underlying: Class A Common Stock · 34,966 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of HYMC Class A Common Stock.

F2 · derivative.exercise_date: 34,966 RSUs were granted on December 15, 2020. Subject to the reporting person's continued employment with the Issuer, the RSUs will vest in 3 equal installments on each of May 28, 2021, May 27, 2022 and May 29, 2023. Vested RSUs will convert into shares of HYMC Class A Common Stock on each applicable vesting date; provided, however, that if, on that conversion date, the reporting person is prohibited from trading in the Issuer's securities pursuant to applicable securities laws or the Company's policies, the conversion date shall be, in the determination of the Board's Compensation Committee, the 2nd trading day after the date the reporting person is no longer prohibited from such trading.

F2 · derivative.expiration_date: 34,966 RSUs were granted on December 15, 2020. Subject to the reporting person's continued employment with the Issuer, the RSUs will vest in 3 equal installments on each of May 28, 2021, May 27, 2022 and May 29, 2023. Vested RSUs will convert into shares of HYMC Class A Common Stock on each applicable vesting date; provided, however, that if, on that conversion date, the reporting person is prohibited from trading in the Issuer's securities pursuant to applicable securities laws or the Company's policies, the conversion date shall be, in the determination of the Board's Compensation Committee, the 2nd trading day after the date the reporting person is no longer prohibited from such trading.

SEC source: 0001718405-20-000011 · wf-form4_160824741508903.xml · nonDerivative · entry 4

GARRETT DIANE R · CIK 0001170429 · President, CEO & Director

10b5-1 filing: Not disclosed

Ownership: Indirect · Through Spouse's IRA

Disclosed balance after: 8,000

SEC source: 0001718405-20-000011 · wf-form4_160824741508903.xml · nonDerivative · entry 1

GARRETT DIANE R · CIK 0001170429 · President, CEO & Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,000

SEC source: 0001718405-20-000009 · wf-form4_160824738021767.xml · nonDerivative · entry 1

RIDEOUT STANTON K · CIK 0001192052 · Executive Vice President & CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,000

SEC source: 0001628280-20-017202 · wf-form4_160746404479888.xml · derivative · entry 4

DAVIS EUGENE I · CIK 0001028689 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,048

Underlying: Class A Common Stock · 5,047 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 restricted stock unit ("RSU") represents a contingent right to receive one share of HYMC Class A Common Stock, par value $0.0001 per share.

F1 · derivative.exercise_date: Represents the 50% of the Annual Grant (described in footnote 4) that vested immediately upon grant and converted into shares of the Issuer's Class A Common Stock.

F1 · derivative.expiration_date: Represents the 50% of the Annual Grant (described in footnote 4) that vested immediately upon grant and converted into shares of the Issuer's Class A Common Stock.

SEC source: 0001628280-20-017202 · wf-form4_160746404479888.xml · derivative · entry 3

DAVIS EUGENE I · CIK 0001028689 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,095

Underlying: Class A Common Stock · 10,095 shares

Expires not disclosed

F2 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of HYMC Class A Common Stock, par value $0.0001 per share.

F4 · derivative.exercise_date: 10,095 RSUs were granted on December 4, 2020 as the reporting person's 2020 annual equity grant ("Annual Grant") for service on the Issuer's Board of Directors. 50% of these RSUs vest immediately on the date of grant and, subject to the reporting person's continued service on the Issuer's Board of Directors, the remaining 50% will vest on the earlier of (a) the Issuer's first annual meeting of stockholders held after the grant date or (b) May 29, 2021. RSUs will convert into shares of the Issuer's Class A Common Stock upon vesting; provided, however, that if, on that conversion date, the reporting person is prohibited from trading in the Issuer's securities pursuant to applicable securities laws or the Company's policies, the conversion date shall be, in the determination of the Board's Compensation Committee, the 2nd trading day after the date the reporting person is no longer prohibited from such trading.

F4 · derivative.expiration_date: 10,095 RSUs were granted on December 4, 2020 as the reporting person's 2020 annual equity grant ("Annual Grant") for service on the Issuer's Board of Directors. 50% of these RSUs vest immediately on the date of grant and, subject to the reporting person's continued service on the Issuer's Board of Directors, the remaining 50% will vest on the earlier of (a) the Issuer's first annual meeting of stockholders held after the grant date or (b) May 29, 2021. RSUs will convert into shares of the Issuer's Class A Common Stock upon vesting; provided, however, that if, on that conversion date, the reporting person is prohibited from trading in the Issuer's securities pursuant to applicable securities laws or the Company's policies, the conversion date shall be, in the determination of the Board's Compensation Committee, the 2nd trading day after the date the reporting person is no longer prohibited from such trading.

SEC source: 0001628280-20-017202 · wf-form4_160746404479888.xml · derivative · entry 2

DAVIS EUGENE I · CIK 0001028689 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,730

Underlying: Class A Common Stock · 6,730 shares

Expires not disclosed

F2 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of HYMC Class A Common Stock, par value $0.0001 per share.

F3 · derivative.exercise_date: 6,730 RSUs were granted on December 4, 2020 as the reporting person's initial equity grant in connection with the reporting person's service on the Issuer's Board of Directors. Subject to the reporting person's continued service on the Issuer's Board of Directors, the RSUs will vest in three equal annual installments beginning on May 29, 2021. RSUs will convert into shares of the Issuer's Class A Common Stock upon vesting; provided, however, that if, on that conversion date, the reporting person is prohibited from trading in the Issuer's securities pursuant to applicable securities laws or the Company's policies, the conversion date shall be, in the determination of the Board's Compensation Committee, the 2nd trading day after the date the reporting person is no longer prohibited from such trading.

F3 · derivative.expiration_date: 6,730 RSUs were granted on December 4, 2020 as the reporting person's initial equity grant in connection with the reporting person's service on the Issuer's Board of Directors. Subject to the reporting person's continued service on the Issuer's Board of Directors, the RSUs will vest in three equal annual installments beginning on May 29, 2021. RSUs will convert into shares of the Issuer's Class A Common Stock upon vesting; provided, however, that if, on that conversion date, the reporting person is prohibited from trading in the Issuer's securities pursuant to applicable securities laws or the Company's policies, the conversion date shall be, in the determination of the Board's Compensation Committee, the 2nd trading day after the date the reporting person is no longer prohibited from such trading.

SEC source: 0001628280-20-017202 · wf-form4_160746404479888.xml · nonDerivative · entry 1

DAVIS EUGENE I · CIK 0001028689 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,047

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 the 50% of the Annual Grant (described in footnote 4) that vested immediately upon grant and converted into shares of the Issuer's Class A Common Stock.

SEC source: 0001628280-20-017203 · wf-form4_160746406180675.xml · derivative · entry 4

Harrison Michael James · CIK 0001814564 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,048

Underlying: Class A Common Stock · 5,047 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 restricted stock unit ("RSU") represents a contingent right to receive one share of HYMC Class A Common Stock, par value $0.0001 per share.

F1 · derivative.exercise_date: Represents the 50% of the Annual Grant (described in footnote 4) that vested immediately upon grant and converted into shares of the Issuer's Class A Common Stock.

F1 · derivative.expiration_date: Represents the 50% of the Annual Grant (described in footnote 4) that vested immediately upon grant and converted into shares of the Issuer's Class A Common Stock.

SEC source: 0001628280-20-017203 · wf-form4_160746406180675.xml · derivative · entry 3

Harrison Michael James · CIK 0001814564 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,095

Underlying: Class A Common Stock · 10,095 shares

Expires not disclosed

F2 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of HYMC Class A Common Stock, par value $0.0001 per share.

F4 · derivative.exercise_date: 10,095 RSUs were granted on December 4, 2020 as the reporting person's 2020 annual equity grant ("Annual Grant") for service on the Issuer's Board of Directors. 50% of these RSUs vest immediately on the date of grant and, subject to the reporting person's continued service on the Issuer's Board of Directors, the remaining 50% will vest on the earlier of (a) the Issuer's first annual meeting of stockholders held after the grant date or (b) May 29, 2021. RSUs will convert into shares of the Issuer's Class A Common Stock upon vesting; provided, however, that if, on that conversion date, the reporting person is prohibited from trading in the Issuer's securities pursuant to applicable securities laws or the Company's policies, the conversion date shall be, in the determination of the Board's Compensation Committee, the 2nd trading day after the date the reporting person is no longer prohibited from such trading.

F4 · derivative.expiration_date: 10,095 RSUs were granted on December 4, 2020 as the reporting person's 2020 annual equity grant ("Annual Grant") for service on the Issuer's Board of Directors. 50% of these RSUs vest immediately on the date of grant and, subject to the reporting person's continued service on the Issuer's Board of Directors, the remaining 50% will vest on the earlier of (a) the Issuer's first annual meeting of stockholders held after the grant date or (b) May 29, 2021. RSUs will convert into shares of the Issuer's Class A Common Stock upon vesting; provided, however, that if, on that conversion date, the reporting person is prohibited from trading in the Issuer's securities pursuant to applicable securities laws or the Company's policies, the conversion date shall be, in the determination of the Board's Compensation Committee, the 2nd trading day after the date the reporting person is no longer prohibited from such trading.

SEC source: 0001628280-20-017203 · wf-form4_160746406180675.xml · derivative · entry 2

Harrison Michael James · CIK 0001814564 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,730

Underlying: Class A Common Stock · 6,730 shares

Expires not disclosed

F2 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of HYMC Class A Common Stock, par value $0.0001 per share.

F3 · derivative.exercise_date: 6,730 RSUs were granted on December 4, 2020 as the reporting person's initial equity grant in connection with the reporting person's service on the Issuer's Board of Directors. Subject to the reporting person's continued service on the Issuer's Board of Directors, the RSUs will vest in three equal annual installments beginning on May 29, 2021. RSUs will convert into shares of the Issuer's Class A Common Stock upon vesting; provided, however, that if, on that conversion date, the reporting person is prohibited from trading in the Issuer's securities pursuant to applicable securities laws or the Company's policies, the conversion date shall be, in the determination of the Board's Compensation Committee, the 2nd trading day after the date the reporting person is no longer prohibited from such trading.

F3 · derivative.expiration_date: 6,730 RSUs were granted on December 4, 2020 as the reporting person's initial equity grant in connection with the reporting person's service on the Issuer's Board of Directors. Subject to the reporting person's continued service on the Issuer's Board of Directors, the RSUs will vest in three equal annual installments beginning on May 29, 2021. RSUs will convert into shares of the Issuer's Class A Common Stock upon vesting; provided, however, that if, on that conversion date, the reporting person is prohibited from trading in the Issuer's securities pursuant to applicable securities laws or the Company's policies, the conversion date shall be, in the determination of the Board's Compensation Committee, the 2nd trading day after the date the reporting person is no longer prohibited from such trading.

SEC source: 0001628280-20-017203 · wf-form4_160746406180675.xml · nonDerivative · entry 1

Harrison Michael James · CIK 0001814564 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,047

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 the 50% of the Annual Grant (described in footnote 4) that vested immediately upon grant and converted into shares of the Issuer's Class A Common Stock.

SEC source: 0001628280-20-017198 · wf-form4_160746399383577.xml · derivative · entry 2

ELLIS JOHN J. · CIK 0001602924 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,095

Underlying: Class A Common Stock · 10,095 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of HYMC Class A Common Stock, par value $0.0001 per share.

F3 · derivative.exercise_date: 10,095 RSUs were granted on December 4, 2020 as the reporting person's 2020 annual equity grant for service on the Issuer's Board of Directors. 50% of these RSUs vest immediately on the date of grant and, subject to the reporting person's continued service on the Issuer's Board of Directors, the remaining 50% will vest on the earlier of (a) the Issuer's first annual meeting of stockholders held after the grant date or (b) May 29, 2021. Vested RSUs will convert into shares of the Issuer's Class A Common Stock upon the reporting person's separation of service from the Issuer's Board of Directors; provided, however, that if, on that conversion date, the reporting person is prohibited from trading in the Issuer's securities pursuant to applicable securities laws or the Company's policies, the conversion date shall be, in the determination of the Board's Compensation Committee, the 2nd trading day after the date the reporting person is no longer prohibited from such trading.

F3 · derivative.expiration_date: 10,095 RSUs were granted on December 4, 2020 as the reporting person's 2020 annual equity grant for service on the Issuer's Board of Directors. 50% of these RSUs vest immediately on the date of grant and, subject to the reporting person's continued service on the Issuer's Board of Directors, the remaining 50% will vest on the earlier of (a) the Issuer's first annual meeting of stockholders held after the grant date or (b) May 29, 2021. Vested RSUs will convert into shares of the Issuer's Class A Common Stock upon the reporting person's separation of service from the Issuer's Board of Directors; provided, however, that if, on that conversion date, the reporting person is prohibited from trading in the Issuer's securities pursuant to applicable securities laws or the Company's policies, the conversion date shall be, in the determination of the Board's Compensation Committee, the 2nd trading day after the date the reporting person is no longer prohibited from such trading.

SEC source: 0001628280-20-017198 · wf-form4_160746399383577.xml · derivative · entry 1

ELLIS JOHN J. · CIK 0001602924 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,730

Underlying: Class A Common Stock · 6,730 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of HYMC Class A Common Stock, par value $0.0001 per share.

F2 · derivative.exercise_date: 6,730 RSUs were granted on December 4, 2020 as the reporting person's initial equity grant in connection with the reporting person's service on the Issuer's Board of Directors. Subject to the reporting person's continued service on the Issuer's Board of Directors, the RSUs will vest in three equal annual installments beginning on May 29, 2021. Vested RSUs will convert into shares of the Issuer's Class A Common Stock upon the reporting person's separation of service from the Issuer's Board of Directors; provided, however, that if, on that conversion date, the reporting person is prohibited from trading in the Issuer's securities pursuant to applicable securities laws or the Company's policies, the conversion date shall be, in the determination of the Board's Compensation Committee, the 2nd trading day after the date the reporting person is no longer prohibited from such trading.

F2 · derivative.expiration_date: 6,730 RSUs were granted on December 4, 2020 as the reporting person's initial equity grant in connection with the reporting person's service on the Issuer's Board of Directors. Subject to the reporting person's continued service on the Issuer's Board of Directors, the RSUs will vest in three equal annual installments beginning on May 29, 2021. Vested RSUs will convert into shares of the Issuer's Class A Common Stock upon the reporting person's separation of service from the Issuer's Board of Directors; provided, however, that if, on that conversion date, the reporting person is prohibited from trading in the Issuer's securities pursuant to applicable securities laws or the Company's policies, the conversion date shall be, in the determination of the Board's Compensation Committee, the 2nd trading day after the date the reporting person is no longer prohibited from such trading.

SEC source: 0001628280-20-017199 · wf-form4_160746401150964.xml · derivative · entry 4

WIESHOFER MARNI · CIK 0001276466 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,048

Underlying: Class A Common Stock · 5,047 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 restricted stock unit ("RSU") represents a contingent right to receive one share of HYMC Class A Common Stock, par value $0.0001 per share.

F1 · derivative.exercise_date: Represents the 50% of the Annual Grant (described in footnote 4) that vested immediately upon grant and converted into shares of the Issuer's Class A Common Stock.

F1 · derivative.expiration_date: Represents the 50% of the Annual Grant (described in footnote 4) that vested immediately upon grant and converted into shares of the Issuer's Class A Common Stock.

SEC source: 0001628280-20-017199 · wf-form4_160746401150964.xml · derivative · entry 3

WIESHOFER MARNI · CIK 0001276466 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,095

Underlying: Class A Common Stock · 10,095 shares

Expires not disclosed

F2 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of HYMC Class A Common Stock, par value $0.0001 per share.

F4 · derivative.exercise_date: 10,095 RSUs were granted on December 4, 2020 as the reporting person's 2020 annual equity grant ("Annual Grant") for service on the Issuer's Board of Directors. 50% of these RSUs vest immediately on the date of grant and, subject to the reporting person's continued service on the Issuer's Board of Directors, the remaining 50% will vest on the earlier of (a) the Issuer's first annual meeting of stockholders held after the grant date or (b) May 29, 2021. RSUs will convert into shares of the Issuer's Class A Common Stock upon vesting; provided, however, that if, on that conversion date, the reporting person is prohibited from trading in the Issuer's securities pursuant to applicable securities laws or the Company's policies, the conversion date shall be, in the determination of the Board's Compensation Committee, the 2nd trading day after the date the reporting person is no longer prohibited from such trading.

F4 · derivative.expiration_date: 10,095 RSUs were granted on December 4, 2020 as the reporting person's 2020 annual equity grant ("Annual Grant") for service on the Issuer's Board of Directors. 50% of these RSUs vest immediately on the date of grant and, subject to the reporting person's continued service on the Issuer's Board of Directors, the remaining 50% will vest on the earlier of (a) the Issuer's first annual meeting of stockholders held after the grant date or (b) May 29, 2021. RSUs will convert into shares of the Issuer's Class A Common Stock upon vesting; provided, however, that if, on that conversion date, the reporting person is prohibited from trading in the Issuer's securities pursuant to applicable securities laws or the Company's policies, the conversion date shall be, in the determination of the Board's Compensation Committee, the 2nd trading day after the date the reporting person is no longer prohibited from such trading.

SEC source: 0001628280-20-017199 · wf-form4_160746401150964.xml · derivative · entry 2

WIESHOFER MARNI · CIK 0001276466 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,730

Underlying: Class A Common Stock · 6,730 shares

Expires not disclosed

F2 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of HYMC Class A Common Stock, par value $0.0001 per share.

F3 · derivative.exercise_date: 6,730 RSUs were granted on December 4, 2020 as the reporting person's initial equity grant in connection with the reporting person's service on the Issuer's Board of Directors. Subject to the reporting person's continued service on the Issuer's Board of Directors, the RSUs will vest in three equal annual installments beginning on May 29, 2021. RSUs will convert into shares of the Issuer's Class A Common Stock upon vesting; provided, however, that if, on that conversion date, the reporting person is prohibited from trading in the Issuer's securities pursuant to applicable securities laws or the Company's policies, the conversion date shall be, in the determination of the Board's Compensation Committee, the 2nd trading day after the date the reporting person is no longer prohibited from such trading.

F3 · derivative.expiration_date: 6,730 RSUs were granted on December 4, 2020 as the reporting person's initial equity grant in connection with the reporting person's service on the Issuer's Board of Directors. Subject to the reporting person's continued service on the Issuer's Board of Directors, the RSUs will vest in three equal annual installments beginning on May 29, 2021. RSUs will convert into shares of the Issuer's Class A Common Stock upon vesting; provided, however, that if, on that conversion date, the reporting person is prohibited from trading in the Issuer's securities pursuant to applicable securities laws or the Company's policies, the conversion date shall be, in the determination of the Board's Compensation Committee, the 2nd trading day after the date the reporting person is no longer prohibited from such trading.

SEC source: 0001628280-20-017199 · wf-form4_160746401150964.xml · nonDerivative · entry 1

WIESHOFER MARNI · CIK 0001276466 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,047

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 the 50% of the Annual Grant (described in footnote 4) that vested immediately upon grant and converted into shares of the Issuer's Class A Common Stock.

SEC source: 0001140361-20-027737 · form4.xml · derivative · entry 2

Mudrick Capital Management, L.P. · CIK 0001655183 · Director · 10% owner

Mudrick Jason · CIK 0001367262 · Director · 10% owner

Mudrick Capital Management LLC · CIK 0001730922 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See notes

Disclosed balance after: 10,095

Underlying: Class A Common Stock · 10,095 shares

Expires not disclosed

F2 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of HYMC Class A Common Stock, par value $0.0001 per share.

F4 · derivative.exercise_date: Represents an award of RSUs granted by the Issuer on December 4, 2020, in connection with Mr. Kirsch's service on the Issuer's Board of Directors issued to Mudrick Capital. 50% of these RSUs vest immediately on the date of grant and, subject to the reporting person's continued service on the Issuer's Board of Directors, the remaining 50% will vest on the earlier of (a) the Issuer's first annual meeting of stockholders held after the grant date or (b) May 29, 2021. Vested RSUs will convert into shares of the Issuer's Class A Common Stock upon Mr. Kirsch's separation of service from the Issuer's Board of Directors.

F4 · derivative.expiration_date: Represents an award of RSUs granted by the Issuer on December 4, 2020, in connection with Mr. Kirsch's service on the Issuer's Board of Directors issued to Mudrick Capital. 50% of these RSUs vest immediately on the date of grant and, subject to the reporting person's continued service on the Issuer's Board of Directors, the remaining 50% will vest on the earlier of (a) the Issuer's first annual meeting of stockholders held after the grant date or (b) May 29, 2021. Vested RSUs will convert into shares of the Issuer's Class A Common Stock upon Mr. Kirsch's separation of service from the Issuer's Board of Directors.

F1 · ownership.nature: This statement is being filed by the following Reporting Persons: Mudrick Capital Management, L.P. ("Mudrick Capital"); Jason Mudrick; and Mudrick Capital Management, LLC ("Mudrick Capital GP").

F5 · ownership.nature: Mr. Kirsch is a Managing Director and Senior Analyst at Mudrick Capital and serves as a director on the Board of Directors of the Issuer. Each of the Reporting Persons is a "director by deputization" solely for purposes of Section 16 of the Securities Exchange Act of 1934, as amended.

SEC source: 0001140361-20-027737 · form4.xml · derivative · entry 1

Mudrick Capital Management, L.P. · CIK 0001655183 · Director · 10% owner

Mudrick Jason · CIK 0001367262 · Director · 10% owner

Mudrick Capital Management LLC · CIK 0001730922 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See notes

Disclosed balance after: 6,730

Underlying: Class A Common Stock · 6,730 shares

Expires not disclosed

F2 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of HYMC Class A Common Stock, par value $0.0001 per share.

F3 · derivative.exercise_date: Represents an award of RSUs granted by the Issuer on December 4, 2020, in connection with David Kirsch's service on the Issuer's Board of Directors issued to Mudrick Capital. Subject to Mr. Kirsch's continued service on the Issuer's Board of Directors, the RSUs will vest in three equal annual installments beginning on May 29, 2021. Vested RSUs will convert into shares of the Issuer's Class A Common Stock upon Mr. Kirsch's separation of service from the Issuer's Board of Directors.

F3 · derivative.expiration_date: Represents an award of RSUs granted by the Issuer on December 4, 2020, in connection with David Kirsch's service on the Issuer's Board of Directors issued to Mudrick Capital. Subject to Mr. Kirsch's continued service on the Issuer's Board of Directors, the RSUs will vest in three equal annual installments beginning on May 29, 2021. Vested RSUs will convert into shares of the Issuer's Class A Common Stock upon Mr. Kirsch's separation of service from the Issuer's Board of Directors.

F1 · ownership.nature: This statement is being filed by the following Reporting Persons: Mudrick Capital Management, L.P. ("Mudrick Capital"); Jason Mudrick; and Mudrick Capital Management, LLC ("Mudrick Capital GP").

F5 · ownership.nature: Mr. Kirsch is a Managing Director and Senior Analyst at Mudrick Capital and serves as a director on the Board of Directors of the Issuer. Each of the Reporting Persons is a "director by deputization" solely for purposes of Section 16 of the Securities Exchange Act of 1934, as amended.

SEC source: 0001628280-20-017201 · wf-form4_160746402748703.xml · derivative · entry 4

WENG THOMAS S. · CIK 0001603617 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,048

Underlying: Class A Common Stock · 5,047 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 restricted stock unit ("RSU") represents a contingent right to receive one share of HYMC Class A Common Stock, par value $0.0001 per share.

F1 · derivative.exercise_date: Represents the 50% of the Annual Grant (described in footnote 4) that vested immediately upon grant and converted into shares of the Issuer's Class A Common Stock.

F1 · derivative.expiration_date: Represents the 50% of the Annual Grant (described in footnote 4) that vested immediately upon grant and converted into shares of the Issuer's Class A Common Stock.

SEC source: 0001628280-20-017201 · wf-form4_160746402748703.xml · derivative · entry 3

WENG THOMAS S. · CIK 0001603617 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,095

Underlying: Class A Common Stock · 10,095 shares

Expires not disclosed

F2 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of HYMC Class A Common Stock, par value $0.0001 per share.

F4 · derivative.exercise_date: 10,095 RSUs were granted on December 4, 2020 as the reporting person's 2020 annual equity grant ("Annual Grant") for service on the Issuer's Board of Directors. 50% of these RSUs vest immediately on the date of grant and, subject to the reporting person's continued service on the Issuer's Board of Directors, the remaining 50% will vest on the earlier of (a) the Issuer's first annual meeting of stockholders held after the grant date or (b) May 29, 2021. RSUs will convert into shares of the Issuer's Class A Common Stock upon vesting; provided, however, that if, on that conversion date, the reporting person is prohibited from trading in the Issuer's securities pursuant to applicable securities laws or the Company's policies, the conversion date shall be, in the determination of the Board's Compensation Committee, the 2nd trading day after the date the reporting person is no longer prohibited from such trading.

F4 · derivative.expiration_date: 10,095 RSUs were granted on December 4, 2020 as the reporting person's 2020 annual equity grant ("Annual Grant") for service on the Issuer's Board of Directors. 50% of these RSUs vest immediately on the date of grant and, subject to the reporting person's continued service on the Issuer's Board of Directors, the remaining 50% will vest on the earlier of (a) the Issuer's first annual meeting of stockholders held after the grant date or (b) May 29, 2021. RSUs will convert into shares of the Issuer's Class A Common Stock upon vesting; provided, however, that if, on that conversion date, the reporting person is prohibited from trading in the Issuer's securities pursuant to applicable securities laws or the Company's policies, the conversion date shall be, in the determination of the Board's Compensation Committee, the 2nd trading day after the date the reporting person is no longer prohibited from such trading.

SEC source: 0001628280-20-017201 · wf-form4_160746402748703.xml · derivative · entry 2

WENG THOMAS S. · CIK 0001603617 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 6,730

Underlying: Class A Common Stock · 6,730 shares

Expires not disclosed

F2 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of HYMC Class A Common Stock, par value $0.0001 per share.

F3 · derivative.exercise_date: 6,730 RSUs were granted on December 4, 2020 as the reporting person's initial equity grant in connection with the reporting person's service on the Issuer's Board of Directors. Subject to the reporting person's continued service on the Issuer's Board of Directors, the RSUs will vest in three equal annual installments beginning on May 29, 2021. Vested RSUs will convert into shares of the Issuer's Class A Common Stock upon the reporting person's separation of service from the Issuer's Board of Directors; provided, however, that if, on that conversion date, the reporting person is prohibited from trading in the Issuer's securities pursuant to applicable securities laws or the Company's policies, the conversion date shall be, in the determination of the Board's Compensation Committee, the 2nd trading day after the date the reporting person is no longer prohibited from such trading.

F3 · derivative.expiration_date: 6,730 RSUs were granted on December 4, 2020 as the reporting person's initial equity grant in connection with the reporting person's service on the Issuer's Board of Directors. Subject to the reporting person's continued service on the Issuer's Board of Directors, the RSUs will vest in three equal annual installments beginning on May 29, 2021. Vested RSUs will convert into shares of the Issuer's Class A Common Stock upon the reporting person's separation of service from the Issuer's Board of Directors; provided, however, that if, on that conversion date, the reporting person is prohibited from trading in the Issuer's securities pursuant to applicable securities laws or the Company's policies, the conversion date shall be, in the determination of the Board's Compensation Committee, the 2nd trading day after the date the reporting person is no longer prohibited from such trading.

SEC source: 0001628280-20-017201 · wf-form4_160746402748703.xml · nonDerivative · entry 1

WENG THOMAS S. · CIK 0001603617 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 5,047

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 the 50% of the Annual Grant (described in footnote 4) that vested immediately upon grant and converted into shares of the Issuer's Class A Common Stock.

SEC source: 0000919574-20-007403 · ownership.xml · nonDerivative · entry 3

WHITEBOX ADVISORS LLC · CIK 0001257391 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 12,003,088

F1 · ownership.nature: These securities are directly owned by certain private funds and may be deemed to be beneficially owned by Whitebox Advisors LLC by virtue of its role as the investment manager of such entities.

F2 · ownership.nature: The Reporting Person disclaims beneficial ownership of the reported securities except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

SEC source: 0000919574-20-007403 · ownership.xml · nonDerivative · entry 2

WHITEBOX ADVISORS LLC · CIK 0001257391 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 12,011,701

F1 · ownership.nature: These securities are directly owned by certain private funds and may be deemed to be beneficially owned by Whitebox Advisors LLC by virtue of its role as the investment manager of such entities.

F2 · ownership.nature: The Reporting Person disclaims beneficial ownership of the reported securities except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

SEC source: 0000919574-20-007403 · ownership.xml · nonDerivative · entry 1

WHITEBOX ADVISORS LLC · CIK 0001257391 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnotes

Disclosed balance after: 12,045,458

F1 · ownership.nature: These securities are directly owned by certain private funds and may be deemed to be beneficially owned by Whitebox Advisors LLC by virtue of its role as the investment manager of such entities.

F2 · ownership.nature: The Reporting Person disclaims beneficial ownership of the reported securities except to the extent of its pecuniary interest therein, and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

SEC source: 0001104659-20-117246 · tm2034118-2_4.xml · derivative · entry 1

RIDEOUT STANTON K · CIK 0001192052 · Executive Vice President & CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 32,982

Underlying: Class A Common Stock · 32,982 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of HYMC Class A Common Stock.

F2 · derivative.exercise_date: 32,982 RSUs were granted on October 20, 2020 in connection with the reporting person's commencement of employment with the Issuer. Subject to the reporting person's continued employment with the Issuer, all 32,982 RSUs will vest and convert into shares of HYMC Class A Common Stock on the 4th anniversary of the grant date, October 20, 2024.

F2 · derivative.expiration_date: 32,982 RSUs were granted on October 20, 2020 in connection with the reporting person's commencement of employment with the Issuer. Subject to the reporting person's continued employment with the Issuer, all 32,982 RSUs will vest and convert into shares of HYMC Class A Common Stock on the 4th anniversary of the grant date, October 20, 2024.

SEC source: 0000902664-20-003549 · ownership.xml · derivative · entry 2

HIGHBRIDGE CAPITAL MANAGEMENT LLC · CIK 0000919185 · 10% owner

Highbridge MSF International Ltd. · CIK 0001308315 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 833,333

Underlying: Common Stock · 833,333 shares

Expires not disclosed

F1 · price: The shares of Common Stock and Warrants reported in this Form 4 are included within 833,333 units (the "Units") purchased by (i) Highbridge MSF International Ltd., a Cayman Islands exempted company ("MSF") and (ii) Highbridge Tactical Credit Master Fund, L.P., a Cayman Islands exempted limited partnership ("HTCC" and together with MSF, the "Highbridge Funds"), for $9.00 per Unit. Each Unit consists of one share of Common Stock and one Warrant to purchase one share of Common Stock.

F4 · derivative.exercise_date: These Warrants can be exercised at any time from the initial issuance date of the Warrants until the earlier to occur of: (x) the date that is five years after the date of the initial issuance of the Warrants or (y) the Redemption Date (as defined in the Warrant Agreement pursuant to which the Warrants were issued).

F4 · derivative.expiration_date: These Warrants can be exercised at any time from the initial issuance date of the Warrants until the earlier to occur of: (x) the date that is five years after the date of the initial issuance of the Warrants or (y) the Redemption Date (as defined in the Warrant Agreement pursuant to which the Warrants were issued).

F2 · ownership.nature: The securities reported herein are held by the Highbridge Funds. Highbridge Capital Management, LLC ("HCM") serves as the trading manager of the Highbridge Funds.

F3 · ownership.nature: The filing of this statement shall not be deemed an admission that either Reporting Person is the beneficial owner of the securities reported herein for purposes of Section 16 of the Securities Act of 1934, as amended, or otherwise. Each Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of its pecuniary interest therein.

SEC source: 0000902664-20-003549 · ownership.xml · nonDerivative · entry 1

HIGHBRIDGE CAPITAL MANAGEMENT LLC · CIK 0000919185 · 10% owner

Highbridge MSF International Ltd. · CIK 0001308315 · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See footnotes

Disclosed balance after: 7,740,213

F1 · price: The shares of Common Stock and Warrants reported in this Form 4 are included within 833,333 units (the "Units") purchased by (i) Highbridge MSF International Ltd., a Cayman Islands exempted company ("MSF") and (ii) Highbridge Tactical Credit Master Fund, L.P., a Cayman Islands exempted limited partnership ("HTCC" and together with MSF, the "Highbridge Funds"), for $9.00 per Unit. Each Unit consists of one share of Common Stock and one Warrant to purchase one share of Common Stock.

F2 · ownership.nature: The securities reported herein are held by the Highbridge Funds. Highbridge Capital Management, LLC ("HCM") serves as the trading manager of the Highbridge Funds.

F3 · ownership.nature: The filing of this statement shall not be deemed an admission that either Reporting Person is the beneficial owner of the securities reported herein for purposes of Section 16 of the Securities Act of 1934, as amended, or otherwise. Each Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of its pecuniary interest therein.

SEC source: 0001140361-20-022730 · form4.xml · derivative · entry 2

Mudrick Capital Management, L.P. · CIK 0001655183 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund GP, LLC · CIK 0001813630 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund II, L.P. · CIK 0001763080 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund II GP, LLC · CIK 0001813765 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund II SC, L.P. · CIK 0001813394 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See Notes

Disclosed balance after: 3,222,222

Underlying: Class A Common Stock · 3,222,222 shares

Expires 2025-10-06

F2 · shares: See Exhibit 99.1 for text of footnote (2).

F2 · price: See Exhibit 99.1 for text of footnote (2).

F4 · derivative.underlying_shares: See Exhibit 99.1 for text of footnote (4).

F4 · balance_after: See Exhibit 99.1 for text of footnote (4).

F1 · ownership.nature: See Exhibit 99.1 for text of footnote (1).

F7 · ownership.nature: See Exhibit 99.1 for text of footnote (7).

SEC source: 0001140361-20-022730 · form4.xml · nonDerivative · entry 1

Mudrick Capital Management, L.P. · CIK 0001655183 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund GP, LLC · CIK 0001813630 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund II, L.P. · CIK 0001763080 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund II GP, LLC · CIK 0001813765 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund II SC, L.P. · CIK 0001813394 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See Notes

Disclosed balance after: 25,203,457

F2 · kind: See Exhibit 99.1 for text of footnote (2).

F2 · shares: See Exhibit 99.1 for text of footnote (2).

F2 · price: See Exhibit 99.1 for text of footnote (2).

F3 · balance_after: See Exhibit 99.1 for text of footnote (3).

F1 · ownership.nature: See Exhibit 99.1 for text of footnote (1).

F6 · ownership.nature: See Exhibit 99.1 for text of footnote (6).

SEC source: 0001140361-20-022729 · form4.xml · derivative · entry 2

Mudrick Capital Management, L.P. · CIK 0001655183 · Director · 10% owner

Mudrick Jason · CIK 0001367262 · Director · 10% owner

Mudrick Capital Acquisition Holdings LLC · CIK 0001718394 · Director · 10% owner

Mudrick Distressed Opportunity Fund Global, LP · CIK 0001813628 · Director · 10% owner

Mudrick Distressed Opportunity Specialty Fund, L.P. · CIK 0001656061 · Director · 10% owner

Mudrick GP, LLC · CIK 0001656059 · Director · 10% owner

Mudrick Distressed Senior Secured Fund Global, L.P. · CIK 0001723936 · Director · 10% owner

Mudrick Senior Secured Fund GP, LLC · CIK 0001813662 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund, L.P. · CIK 0001665193 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See Notes

Disclosed balance after: 3,222,222

Underlying: Class A Common Stock · 3,222,222 shares

Expires 2025-10-06

F2 · shares: See Exhibit 99.1 for text of footnote (2).

F2 · price: See Exhibit 99.1 for text of footnote (2).

F4 · derivative.underlying_shares: See Exhibit 99.1 for text of footnote (4).

F4 · balance_after: See Exhibit 99.1 for text of footnote (4).

F1 · ownership.nature: See Exhibit 99.1 for text of footnote (1).

F7 · ownership.nature: See Exhibit 99.1 for text of footnote (7).

SEC source: 0001140361-20-022729 · form4.xml · nonDerivative · entry 1

Mudrick Capital Management, L.P. · CIK 0001655183 · Director · 10% owner

Mudrick Jason · CIK 0001367262 · Director · 10% owner

Mudrick Capital Acquisition Holdings LLC · CIK 0001718394 · Director · 10% owner

Mudrick Distressed Opportunity Fund Global, LP · CIK 0001813628 · Director · 10% owner

Mudrick Distressed Opportunity Specialty Fund, L.P. · CIK 0001656061 · Director · 10% owner

Mudrick GP, LLC · CIK 0001656059 · Director · 10% owner

Mudrick Distressed Senior Secured Fund Global, L.P. · CIK 0001723936 · Director · 10% owner

Mudrick Senior Secured Fund GP, LLC · CIK 0001813662 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund, L.P. · CIK 0001665193 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See Notes

Disclosed balance after: 25,203,457

F2 · kind: See Exhibit 99.1 for text of footnote (2).

F2 · shares: See Exhibit 99.1 for text of footnote (2).

F2 · price: See Exhibit 99.1 for text of footnote (2).

F3 · balance_after: See Exhibit 99.1 for text of footnote (3).

F1 · ownership.nature: See Exhibit 99.1 for text of footnote (1).

F6 · ownership.nature: See Exhibit 99.1 for text of footnote (6).

SEC source: 0001140361-20-023159 · form4.xml · derivative · entry 2

Mudrick Capital Management, L.P. · CIK 0001655183 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund GP, LLC · CIK 0001813630 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund II, L.P. · CIK 0001763080 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund II GP, LLC · CIK 0001813765 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund II SC, L.P. · CIK 0001813394 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See Notes

Disclosed balance after: 3,222,222

Underlying: Class A Common Stock · 3,222,222 shares

Expires 2025-10-06

F2 · shares: See Exhibit 99.1 for text of footnote (2).

F2 · price: See Exhibit 99.1 for text of footnote (2).

F4 · derivative.underlying_shares: See Exhibit 99.1 for text of footnote (4).

F4 · balance_after: See Exhibit 99.1 for text of footnote (4).

F1 · ownership.nature: See Exhibit 99.1 for text of footnote (1).

F7 · ownership.nature: See Exhibit 99.1 for text of footnote (7).

SEC source: 0001140361-20-023159 · form4.xml · nonDerivative · entry 1

Mudrick Capital Management, L.P. · CIK 0001655183 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund GP, LLC · CIK 0001813630 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund II, L.P. · CIK 0001763080 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund II GP, LLC · CIK 0001813765 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund II SC, L.P. · CIK 0001813394 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See Notes

Disclosed balance after: 25,203,457

F2 · kind: See Exhibit 99.1 for text of footnote (2).

F2 · shares: See Exhibit 99.1 for text of footnote (2).

F2 · price: See Exhibit 99.1 for text of footnote (2).

F3 · balance_after: See Exhibit 99.1 for text of footnote (3).

F1 · ownership.nature: See Exhibit 99.1 for text of footnote (1).

F6 · ownership.nature: See Exhibit 99.1 for text of footnote (6).

SEC source: 0001140361-20-023155 · form4.xml · derivative · entry 2

Mudrick Capital Management, L.P. · CIK 0001655183 · Director · 10% owner

Mudrick Jason · CIK 0001367262 · Director · 10% owner

Mudrick Capital Acquisition Holdings LLC · CIK 0001718394 · Director · 10% owner

Mudrick Distressed Opportunity Fund Global, LP · CIK 0001813628 · Director · 10% owner

Mudrick Distressed Opportunity Specialty Fund, L.P. · CIK 0001656061 · Director · 10% owner

Mudrick GP, LLC · CIK 0001656059 · Director · 10% owner

Mudrick Distressed Senior Secured Fund Global, L.P. · CIK 0001723936 · Director · 10% owner

Mudrick Senior Secured Fund GP, LLC · CIK 0001813662 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund, L.P. · CIK 0001665193 · Director · 10% owner

Mudrick Capital Management LLC · CIK 0001730922 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See Notes

Disclosed balance after: 3,222,222

Underlying: Class A Common Stock · 3,222,222 shares

Expires 2025-10-06

F2 · shares: See Exhibit 99.1 for text of footnote (2).

F2 · price: See Exhibit 99.1 for text of footnote (2).

F4 · derivative.underlying_shares: See Exhibit 99.1 for text of footnote (4).

F4 · balance_after: See Exhibit 99.1 for text of footnote (4).

F1 · ownership.nature: See Exhibit 99.1 for text of footnote (1).

F7 · ownership.nature: See Exhibit 99.1 for text of footnote (7).

SEC source: 0001140361-20-023155 · form4.xml · nonDerivative · entry 1

Mudrick Capital Management, L.P. · CIK 0001655183 · Director · 10% owner

Mudrick Jason · CIK 0001367262 · Director · 10% owner

Mudrick Capital Acquisition Holdings LLC · CIK 0001718394 · Director · 10% owner

Mudrick Distressed Opportunity Fund Global, LP · CIK 0001813628 · Director · 10% owner

Mudrick Distressed Opportunity Specialty Fund, L.P. · CIK 0001656061 · Director · 10% owner

Mudrick GP, LLC · CIK 0001656059 · Director · 10% owner

Mudrick Distressed Senior Secured Fund Global, L.P. · CIK 0001723936 · Director · 10% owner

Mudrick Senior Secured Fund GP, LLC · CIK 0001813662 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund, L.P. · CIK 0001665193 · Director · 10% owner

Mudrick Capital Management LLC · CIK 0001730922 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See Notes

Disclosed balance after: 25,203,457

F2 · kind: See Exhibit 99.1 for text of footnote (2).

F2 · shares: See Exhibit 99.1 for text of footnote (2).

F2 · price: See Exhibit 99.1 for text of footnote (2).

F3 · balance_after: See Exhibit 99.1 for text of footnote (3).

F1 · ownership.nature: See Exhibit 99.1 for text of footnote (1).

F6 · ownership.nature: See Exhibit 99.1 for text of footnote (6).

SEC source: 0001104659-20-103978 · tm2030529d1_4.xml · derivative · entry 1

GARRETT DIANE R · CIK 0001170429 · Director · President, CEO & Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 96,154

Underlying: Class A Common Stock · 96,154 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of HYMC Class A Common Stock.

F2 · derivative.exercise_date: 96,154 RSUs were granted on September 8, 2020 in connection with the reporting person's commencement of employment with the Issuer. Subject to the reporting person's continued employment with the Issuer, all 96,154 RSUs will vest and convert into shares of HYMC Class A Common Stock on the 4th anniversary of the grant date, September 8, 2024.

F2 · derivative.expiration_date: 96,154 RSUs were granted on September 8, 2020 in connection with the reporting person's commencement of employment with the Issuer. Subject to the reporting person's continued employment with the Issuer, all 96,154 RSUs will vest and convert into shares of HYMC Class A Common Stock on the 4th anniversary of the grant date, September 8, 2024.

SEC source: 0001104659-20-069157 · tm2021671-3_4.xml · derivative · entry 9

Mudrick Capital Management, L.P. · CIK 0001655183 · Director · 10% owner

Mudrick Distressed Opportunity Specialty Fund, L.P. · CIK 0001656061 · Director · 10% owner

Mudrick GP, LLC · CIK 0001656059 · Director · 10% owner

Mudrick Distressed Senior Secured Fund Global, L.P. · CIK 0001723936 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund, L.P. · CIK 0001665193 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund II, L.P. · CIK 0001763080 · Director · 10% owner

Mudrick Senior Secured Fund GP, LLC · CIK 0001813662 · Director · 10% owner

Mudrick Distressed Opportunity Fund Global, LP · CIK 0001813628 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund GP, LLC · CIK 0001813630 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund II GP, LLC · CIK 0001813765 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See Notes

Disclosed balance after: 1,295,892

Underlying: Class A Common Stock · 1,295,892 shares

Expires not disclosed

F7 · derivative.exercise_price: See Exhibit 99.1 for text of footnote (7).

F7 · shares: See Exhibit 99.1 for text of footnote (7).

F7 · price: See Exhibit 99.1 for text of footnote (7).

F5 · derivative.exercise_date: See Exhibit 99.1 for text of footnote (5).

F5 · derivative.expiration_date: See Exhibit 99.1 for text of footnote (5).

F5 · derivative.underlying_shares: See Exhibit 99.1 for text of footnote (5).

F1 · ownership.nature: See Exhibit 99.1 for text of footnote (1).

F9 · ownership.nature: See Exhibit 99.1 for text of footnote (9).

F10 · ownership.nature: See Exhibit 99.1 for text of footnote (10).

SEC source: 0001104659-20-069157 · tm2021671-3_4.xml · derivative · entry 8

Mudrick Capital Management, L.P. · CIK 0001655183 · Director · 10% owner

Mudrick Distressed Opportunity Specialty Fund, L.P. · CIK 0001656061 · Director · 10% owner

Mudrick GP, LLC · CIK 0001656059 · Director · 10% owner

Mudrick Distressed Senior Secured Fund Global, L.P. · CIK 0001723936 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund, L.P. · CIK 0001665193 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund II, L.P. · CIK 0001763080 · Director · 10% owner

Mudrick Senior Secured Fund GP, LLC · CIK 0001813662 · Director · 10% owner

Mudrick Distressed Opportunity Fund Global, LP · CIK 0001813628 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund GP, LLC · CIK 0001813630 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund II GP, LLC · CIK 0001813765 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See Notes (1)(9)(10))

Disclosed balance after: 2,500,000

Underlying: Class A Common Stock · 2,500,000 shares

Expires not disclosed

F4 · derivative.exercise_price: See Exhibit 99.1 for text of footnote (4).

F4 · shares: See Exhibit 99.1 for text of footnote (4).

F4 · price: See Exhibit 99.1 for text of footnote (4).

F5 · derivative.exercise_date: See Exhibit 99.1 for text of footnote (5).

F5 · derivative.expiration_date: See Exhibit 99.1 for text of footnote (5).

F5 · derivative.underlying_shares: See Exhibit 99.1 for text of footnote (5).

SEC source: 0001104659-20-069157 · tm2021671-3_4.xml · derivative · entry 7

Mudrick Capital Management, L.P. · CIK 0001655183 · Director · 10% owner

Mudrick Distressed Opportunity Specialty Fund, L.P. · CIK 0001656061 · Director · 10% owner

Mudrick GP, LLC · CIK 0001656059 · Director · 10% owner

Mudrick Distressed Senior Secured Fund Global, L.P. · CIK 0001723936 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund, L.P. · CIK 0001665193 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund II, L.P. · CIK 0001763080 · Director · 10% owner

Mudrick Senior Secured Fund GP, LLC · CIK 0001813662 · Director · 10% owner

Mudrick Distressed Opportunity Fund Global, LP · CIK 0001813628 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund GP, LLC · CIK 0001813630 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund II GP, LLC · CIK 0001813765 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See Notes

Disclosed balance after: 0

Underlying: Class A Common Stock · 1,688,180 shares

Expires not disclosed

F3 · derivative.exercise_price: See Exhibit 99.1 for text of footnote (3).

F3 · shares: See Exhibit 99.1 for text of footnote (3).

F3 · price: See Exhibit 99.1 for text of footnote (3).

F3 · derivative.exercise_date: See Exhibit 99.1 for text of footnote (3).

F3 · derivative.expiration_date: See Exhibit 99.1 for text of footnote (3).

F3 · derivative.underlying_shares: See Exhibit 99.1 for text of footnote (3).

F1 · ownership.nature: See Exhibit 99.1 for text of footnote (1).

F9 · ownership.nature: See Exhibit 99.1 for text of footnote (9).

F10 · ownership.nature: See Exhibit 99.1 for text of footnote (10).

SEC source: 0001104659-20-069157 · tm2021671-3_4.xml · derivative · entry 6

Mudrick Capital Management, L.P. · CIK 0001655183 · Director · 10% owner

Mudrick Distressed Opportunity Specialty Fund, L.P. · CIK 0001656061 · Director · 10% owner

Mudrick GP, LLC · CIK 0001656059 · Director · 10% owner

Mudrick Distressed Senior Secured Fund Global, L.P. · CIK 0001723936 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund, L.P. · CIK 0001665193 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund II, L.P. · CIK 0001763080 · Director · 10% owner

Mudrick Senior Secured Fund GP, LLC · CIK 0001813662 · Director · 10% owner

Mudrick Distressed Opportunity Fund Global, LP · CIK 0001813628 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund GP, LLC · CIK 0001813630 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund II GP, LLC · CIK 0001813765 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See Notes

Disclosed balance after: 1,688,180

Underlying: Class A Common Stock · 3,511,820 shares

Expires not disclosed

F2 · derivative.exercise_price: See Exhibit 99.1 for text of footnote (2).

F2 · shares: See Exhibit 99.1 for text of footnote (2).

F2 · price: See Exhibit 99.1 for text of footnote (2).

F2 · derivative.exercise_date: See Exhibit 99.1 for text of footnote (2).

F2 · derivative.expiration_date: See Exhibit 99.1 for text of footnote (2).

F2 · derivative.underlying_shares: See Exhibit 99.1 for text of footnote (2).

F1 · ownership.nature: See Exhibit 99.1 for text of footnote (1).

F9 · ownership.nature: See Exhibit 99.1 for text of footnote (9).

F10 · ownership.nature: See Exhibit 99.1 for text of footnote (10).

SEC source: 0001104659-20-069157 · tm2021671-3_4.xml · nonDerivative · entry 5

Mudrick Capital Management, L.P. · CIK 0001655183 · Director · 10% owner

Mudrick Distressed Opportunity Specialty Fund, L.P. · CIK 0001656061 · Director · 10% owner

Mudrick GP, LLC · CIK 0001656059 · Director · 10% owner

Mudrick Distressed Senior Secured Fund Global, L.P. · CIK 0001723936 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund, L.P. · CIK 0001665193 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund II, L.P. · CIK 0001763080 · Director · 10% owner

Mudrick Senior Secured Fund GP, LLC · CIK 0001813662 · Director · 10% owner

Mudrick Distressed Opportunity Fund Global, LP · CIK 0001813628 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund GP, LLC · CIK 0001813630 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund II GP, LLC · CIK 0001813765 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See Notes

Disclosed balance after: 21,981,238

F8 · kind: See Exhibit 99.1 for text of footnote (8).

F8 · price: See Exhibit 99.1 for text of footnote (8).

F1 · ownership.nature: See Exhibit 99.1 for text of footnote (1).

F9 · ownership.nature: See Exhibit 99.1 for text of footnote (9).

F10 · ownership.nature: See Exhibit 99.1 for text of footnote (10).

SEC source: 0001104659-20-069157 · tm2021671-3_4.xml · nonDerivative · entry 4

Mudrick Capital Management, L.P. · CIK 0001655183 · Director · 10% owner

Mudrick Distressed Opportunity Specialty Fund, L.P. · CIK 0001656061 · Director · 10% owner

Mudrick GP, LLC · CIK 0001656059 · Director · 10% owner

Mudrick Distressed Senior Secured Fund Global, L.P. · CIK 0001723936 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund, L.P. · CIK 0001665193 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund II, L.P. · CIK 0001763080 · Director · 10% owner

Mudrick Senior Secured Fund GP, LLC · CIK 0001813662 · Director · 10% owner

Mudrick Distressed Opportunity Fund Global, LP · CIK 0001813628 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund GP, LLC · CIK 0001813630 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund II GP, LLC · CIK 0001813765 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See Notes

Disclosed balance after: 16,164,223

F7 · kind: See Exhibit 99.1 for text of footnote (7).

F7 · price: See Exhibit 99.1 for text of footnote (7).

F1 · ownership.nature: See Exhibit 99.1 for text of footnote (1).

F9 · ownership.nature: See Exhibit 99.1 for text of footnote (9).

F10 · ownership.nature: See Exhibit 99.1 for text of footnote (10).

SEC source: 0001104659-20-069157 · tm2021671-3_4.xml · nonDerivative · entry 3

Mudrick Capital Management, L.P. · CIK 0001655183 · Director · 10% owner

Mudrick Distressed Opportunity Specialty Fund, L.P. · CIK 0001656061 · Director · 10% owner

Mudrick GP, LLC · CIK 0001656059 · Director · 10% owner

Mudrick Distressed Senior Secured Fund Global, L.P. · CIK 0001723936 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund, L.P. · CIK 0001665193 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund II, L.P. · CIK 0001763080 · Director · 10% owner

Mudrick Senior Secured Fund GP, LLC · CIK 0001813662 · Director · 10% owner

Mudrick Distressed Opportunity Fund Global, LP · CIK 0001813628 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund GP, LLC · CIK 0001813630 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund II GP, LLC · CIK 0001813765 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See Notes

Disclosed balance after: 13,135,299

F6 · kind: See Exhibit 99.1 for text of footnote (6).

F6 · price: See Exhibit 99.1 for text of footnote (6).

F1 · ownership.nature: See Exhibit 99.1 for text of footnote (1).

F9 · ownership.nature: See Exhibit 99.1 for text of footnote (9).

F10 · ownership.nature: See Exhibit 99.1 for text of footnote (10).

SEC source: 0001104659-20-069157 · tm2021671-3_4.xml · nonDerivative · entry 2

Mudrick Capital Management, L.P. · CIK 0001655183 · Director · 10% owner

Mudrick Distressed Opportunity Specialty Fund, L.P. · CIK 0001656061 · Director · 10% owner

Mudrick GP, LLC · CIK 0001656059 · Director · 10% owner

Mudrick Distressed Senior Secured Fund Global, L.P. · CIK 0001723936 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund, L.P. · CIK 0001665193 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund II, L.P. · CIK 0001763080 · Director · 10% owner

Mudrick Senior Secured Fund GP, LLC · CIK 0001813662 · Director · 10% owner

Mudrick Distressed Opportunity Fund Global, LP · CIK 0001813628 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund GP, LLC · CIK 0001813630 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund II GP, LLC · CIK 0001813765 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See Notes

Disclosed balance after: 4,813,180

F4 · kind: See Exhibit 99.1 for text of footnote (4).

F4 · price: See Exhibit 99.1 for text of footnote (4).

F1 · ownership.nature: See Exhibit 99.1 for text of footnote (1).

F9 · ownership.nature: See Exhibit 99.1 for text of footnote (9).

F10 · ownership.nature: See Exhibit 99.1 for text of footnote (10).

SEC source: 0001104659-20-069157 · tm2021671-3_4.xml · nonDerivative · entry 1

Mudrick Capital Management, L.P. · CIK 0001655183 · Director · 10% owner

Mudrick Distressed Opportunity Specialty Fund, L.P. · CIK 0001656061 · Director · 10% owner

Mudrick GP, LLC · CIK 0001656059 · Director · 10% owner

Mudrick Distressed Senior Secured Fund Global, L.P. · CIK 0001723936 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund, L.P. · CIK 0001665193 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund II, L.P. · CIK 0001763080 · Director · 10% owner

Mudrick Senior Secured Fund GP, LLC · CIK 0001813662 · Director · 10% owner

Mudrick Distressed Opportunity Fund Global, LP · CIK 0001813628 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund GP, LLC · CIK 0001813630 · Director · 10% owner

Mudrick Distressed Opportunity Drawdown Fund II GP, LLC · CIK 0001813765 · Director · 10% owner

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

10b5-1 filing: Not disclosed

Ownership: Indirect · See Notes

Disclosed balance after: 1,688,180

F3 · kind: See Exhibit 99.1 for text of footnote (3).

F3 · price: See Exhibit 99.1 for text of footnote (3).

F1 · ownership.nature: See Exhibit 99.1 for text of footnote (1).

F9 · ownership.nature: See Exhibit 99.1 for text of footnote (9).

F10 · ownership.nature: See Exhibit 99.1 for text of footnote (10).

SEC source: 0001104659-20-069041 · tm2021579d4_4.xml · derivative · entry 1

Jones Stephen Martin · CIK 0001544356 · EVP, CFO and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 54,018

Underlying: Class A Common Stock · 54,018 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of HYMC Class A Common Stock.

F2 · derivative.exercise_date: 25,723 RSUs vested on May 29, 2020 and 28,295 RSUs vested on June 1, 2020 and the RSUs will convert into shares of HYMC Class A Common Stock on December 31, 2020.

F2 · derivative.expiration_date: 25,723 RSUs vested on May 29, 2020 and 28,295 RSUs vested on June 1, 2020 and the RSUs will convert into shares of HYMC Class A Common Stock on December 31, 2020.

SEC source: 0001104659-20-069039 · tm2021579d3_4.xml · derivative · entry 1

Buffington Randy E. · CIK 0001566288 · Director · Chairman, President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 80,072

Underlying: Class A Common Stock · 80,072 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit ("RSU") represents a contingent right to receive one share of HYMC Class A Common Stock.

F2 · derivative.exercise_date: 38,129 RSUs vested on May 29, 2020 and 41,943 RSUs vested on June 1, 2020 and the RSUs will convert into shares of HYMC Class A Common Stock on December 31, 2020.

F2 · derivative.expiration_date: 38,129 RSUs vested on May 29, 2020 and 41,943 RSUs vested on June 1, 2020 and the RSUs will convert into shares of HYMC Class A Common Stock on December 31, 2020.