TUSK

SEC source: 0001679268-22-000033 · wf-form4_165662014273414.xml · nonDerivative · entry 1

SMITH ARTHUR L · CIK 0001034323 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 183,368

F1 · shares: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant. These securities will vest on the earlier of June 29, 2023 and the date of the issuer's 2023 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer.

SEC source: 0001679268-22-000029 · wf-form4_165661993180365.xml · nonDerivative · entry 1

Amron Arthur H · CIK 0001179697 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 45,662

F1 · shares: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant. These securities will vest on the earlier of June 29, 2023 and the date of the issuer's 2023 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer. These restricted stock units have been assigned to Wexford Capital LP under the terms of Mr. Amron's employment with Wexford Capital LP. As a result, Mr. Amron disclaims any interest in these restricted stock units, except for his pecuniary interest therein.

F1 · balance_after: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant. These securities will vest on the earlier of June 29, 2023 and the date of the issuer's 2023 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer. These restricted stock units have been assigned to Wexford Capital LP under the terms of Mr. Amron's employment with Wexford Capital LP. As a result, Mr. Amron disclaims any interest in these restricted stock units, except for his pecuniary interest therein.

SEC source: 0001679268-22-000031 · wf-form4_165662004932721.xml · nonDerivative · entry 1

Jacobi Paul M. · CIK 0001477880 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 45,662

F1 · shares: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant. These securities will vest on the earlier of June 29, 2023 and the date of the issuer's 2023 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer. These restricted stock units have been assigned to Wexford Capital LP under the terms of Mr. Jacobi's employment with Wexford Capital LP. As a result, Mr. Jacobi disclaims any interest in these restricted stock units, except for his pecuniary interest therein.

F1 · balance_after: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant. These securities will vest on the earlier of June 29, 2023 and the date of the issuer's 2023 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer. These restricted stock units have been assigned to Wexford Capital LP under the terms of Mr. Jacobi's employment with Wexford Capital LP. As a result, Mr. Jacobi disclaims any interest in these restricted stock units, except for his pecuniary interest therein.

SEC source: 0001679268-22-000032 · wf-form4_165662009076144.xml · nonDerivative · entry 1

Palm James D · CIK 0001346557 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 188,478

F1 · shares: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant. These securities will vest on the earlier of June 29, 2023 and the date of the issuer's 2023 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer.

SEC source: 0001679268-22-000030 · wf-form4_165661997464016.xml · nonDerivative · entry 1

Booker Corey J. · CIK 0001821262 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 124,921

F1 · shares: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant. These securities will vest on the earlier of June 29, 2023 and the date of the issuer's 2023 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer.

SEC source: 0001048462-22-000021 · form4.xml · nonDerivative · entry 2

WEXFORD CAPITAL LP · CIK 0001048462 · Director · 10% owner

Wexford GP LLC · CIK 0001472112 · Director · 10% owner

DAVIDSON CHARLES E · CIK 0001001391 · Director · 10% owner

JACOBS JOSEPH · CIK 0001048485 · Director · 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: 22,434,125

F2 · price: Represents a weighted average price. These shares of common stock were purchased in multiple transactions at prices ranging from $2.1745 to $2.1749, inclusive. The Reporting Persons, as defined below, undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth herein

F3 · ownership.nature: Wexford Capital LP ("Wexford Capital") may, by reason of its status as (i) sub-advisor of each of Wexford Spectrum Trading Limited ("WST") and Wexford Catalyst Trading Limited ("WCT") and (ii) manager of each of Wexford Focused Investors LLC ("WFI") and MEH SUB LLC ("MEH", and together with WST, WCT and WFI, the "Wexford Entities"), be deemed to own beneficially the securities held by the Wexford Entities. Wexford GP LLC ("Wexford GP") may, as the General Partner of Wexford Capital, be deemed to own beneficially the securities held by the Wexford Entities. Each of Charles E. Davidson ("Davidson") and Joseph M. Jacobs ("Jacobs", and together with the Wexford Entities, Wexford Capital, Wexford GP and Davidson, the "Reporting Persons") may, by reason of his status as a controlling person of Wexford GP, be deemed to own beneficially the securities held by the Wexford Entities.

F4 · ownership.nature: Each of Wexford Capital, Wexford GP, Davidson and Jacobs share the power to vote and to dispose of the securities held by the Wexford Entities. Each of Wexford Capital, Wexford GP, Davidson and Jacobs disclaim beneficial ownership of the securities held by the Wexford Entities and this report shall not be deemed as an admission that they are the beneficial owners of such securities, except to the extent of any pecuniary interests therein. The Reporting Persons may be deemed to be directors by deputization by virtue of Paul Jacobi and Arthur Amron, each an employee of Wexford Capital, serving as directors of the Issuer.

SEC source: 0001048462-22-000021 · form4.xml · nonDerivative · entry 1

WEXFORD CAPITAL LP · CIK 0001048462 · Director · 10% owner

Wexford GP LLC · CIK 0001472112 · Director · 10% owner

DAVIDSON CHARLES E · CIK 0001001391 · Director · 10% owner

JACOBS JOSEPH · CIK 0001048485 · Director · 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: 22,423,743

F1 · price: Represents a weighted average price. These shares of common stock were purchased in multiple transactions at prices ranging from $2.1098 to $2.1452, inclusive. The Reporting Persons, as defined below, undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth herein.

F3 · ownership.nature: Wexford Capital LP ("Wexford Capital") may, by reason of its status as (i) sub-advisor of each of Wexford Spectrum Trading Limited ("WST") and Wexford Catalyst Trading Limited ("WCT") and (ii) manager of each of Wexford Focused Investors LLC ("WFI") and MEH SUB LLC ("MEH", and together with WST, WCT and WFI, the "Wexford Entities"), be deemed to own beneficially the securities held by the Wexford Entities. Wexford GP LLC ("Wexford GP") may, as the General Partner of Wexford Capital, be deemed to own beneficially the securities held by the Wexford Entities. Each of Charles E. Davidson ("Davidson") and Joseph M. Jacobs ("Jacobs", and together with the Wexford Entities, Wexford Capital, Wexford GP and Davidson, the "Reporting Persons") may, by reason of his status as a controlling person of Wexford GP, be deemed to own beneficially the securities held by the Wexford Entities.

F4 · ownership.nature: Each of Wexford Capital, Wexford GP, Davidson and Jacobs share the power to vote and to dispose of the securities held by the Wexford Entities. Each of Wexford Capital, Wexford GP, Davidson and Jacobs disclaim beneficial ownership of the securities held by the Wexford Entities and this report shall not be deemed as an admission that they are the beneficial owners of such securities, except to the extent of any pecuniary interests therein. The Reporting Persons may be deemed to be directors by deputization by virtue of Paul Jacobi and Arthur Amron, each an employee of Wexford Capital, serving as directors of the Issuer.

SEC source: 0001048462-22-000018 · form4.xml · nonDerivative · entry 3

WEXFORD CAPITAL LP · CIK 0001048462 · Director · 10% owner

Wexford GP LLC · CIK 0001472112 · Director · 10% owner

DAVIDSON CHARLES E · CIK 0001001391 · Director · 10% owner

JACOBS JOSEPH · CIK 0001048485 · Director · 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: 22,388,743

F2 · price: Represents a weighted average price. These shares of common stock were purchased in multiple transactions at prices ranging from $2.2292 to $2.2326, inclusive. The Reporting Persons, as defined below, undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth herein

F3 · ownership.nature: Wexford Capital LP ("Wexford Capital") may, by reason of its status as (i) sub-advisor of each of Wexford Spectrum Trading Limited ("WST") and Wexford Catalyst Trading Limited ("WCT") and (ii) manager of each of Wexford Focused Investors LLC ("WFI") and MEH SUB LLC ("MEH", and together with WST, WCT and WFI, the "Wexford Entities"), be deemed to own beneficially the securities held by the Wexford Entities. Wexford GP LLC ("Wexford GP") may, as the General Partner of Wexford Capital, be deemed to own beneficially the securities held by the Wexford Entities. Each of Charles E. Davidson ("Davidson") and Joseph M. Jacobs ("Jacobs", and together with the Wexford Entities, Wexford Capital, Wexford GP and Davidson, the "Reporting Persons") may, by reason of his status as a controlling person of Wexford GP, be deemed to own beneficially the securities held by the Wexford Entities.

F4 · ownership.nature: Each of Wexford Capital, Wexford GP, Davidson and Jacobs share the power to vote and to dispose of the securities held by the Wexford Entities. Each of Wexford Capital, Wexford GP, Davidson and Jacobs disclaim beneficial ownership of the securities held by the Wexford Entities and this report shall not be deemed as an admission that they are the beneficial owners of such securities, except to the extent of any pecuniary interests therein. The Reporting Persons may be deemed to be directors by deputization by virtue of Paul Jacobi and Arthur Amron, each an employee of Wexford Capital, serving as directors of the Issuer.

SEC source: 0001048462-22-000018 · form4.xml · nonDerivative · entry 2

WEXFORD CAPITAL LP · CIK 0001048462 · Director · 10% owner

Wexford GP LLC · CIK 0001472112 · Director · 10% owner

DAVIDSON CHARLES E · CIK 0001001391 · Director · 10% owner

JACOBS JOSEPH · CIK 0001048485 · Director · 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: 22,383,643

F1 · price: Represents a weighted average price. These shares of common stock were purchased in multiple transactions at prices ranging from $2.2638 to $2.2969, inclusive. The Reporting Persons, as defined below, undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth herein.

F3 · ownership.nature: Wexford Capital LP ("Wexford Capital") may, by reason of its status as (i) sub-advisor of each of Wexford Spectrum Trading Limited ("WST") and Wexford Catalyst Trading Limited ("WCT") and (ii) manager of each of Wexford Focused Investors LLC ("WFI") and MEH SUB LLC ("MEH", and together with WST, WCT and WFI, the "Wexford Entities"), be deemed to own beneficially the securities held by the Wexford Entities. Wexford GP LLC ("Wexford GP") may, as the General Partner of Wexford Capital, be deemed to own beneficially the securities held by the Wexford Entities. Each of Charles E. Davidson ("Davidson") and Joseph M. Jacobs ("Jacobs", and together with the Wexford Entities, Wexford Capital, Wexford GP and Davidson, the "Reporting Persons") may, by reason of his status as a controlling person of Wexford GP, be deemed to own beneficially the securities held by the Wexford Entities.

F4 · ownership.nature: Each of Wexford Capital, Wexford GP, Davidson and Jacobs share the power to vote and to dispose of the securities held by the Wexford Entities. Each of Wexford Capital, Wexford GP, Davidson and Jacobs disclaim beneficial ownership of the securities held by the Wexford Entities and this report shall not be deemed as an admission that they are the beneficial owners of such securities, except to the extent of any pecuniary interests therein. The Reporting Persons may be deemed to be directors by deputization by virtue of Paul Jacobi and Arthur Amron, each an employee of Wexford Capital, serving as directors of the Issuer.

SEC source: 0001048462-22-000018 · form4.xml · nonDerivative · entry 1

WEXFORD CAPITAL LP · CIK 0001048462 · Director · 10% owner

Wexford GP LLC · CIK 0001472112 · Director · 10% owner

DAVIDSON CHARLES E · CIK 0001001391 · Director · 10% owner

JACOBS JOSEPH · CIK 0001048485 · Director · 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: 22,363,043

F3 · ownership.nature: Wexford Capital LP ("Wexford Capital") may, by reason of its status as (i) sub-advisor of each of Wexford Spectrum Trading Limited ("WST") and Wexford Catalyst Trading Limited ("WCT") and (ii) manager of each of Wexford Focused Investors LLC ("WFI") and MEH SUB LLC ("MEH", and together with WST, WCT and WFI, the "Wexford Entities"), be deemed to own beneficially the securities held by the Wexford Entities. Wexford GP LLC ("Wexford GP") may, as the General Partner of Wexford Capital, be deemed to own beneficially the securities held by the Wexford Entities. Each of Charles E. Davidson ("Davidson") and Joseph M. Jacobs ("Jacobs", and together with the Wexford Entities, Wexford Capital, Wexford GP and Davidson, the "Reporting Persons") may, by reason of his status as a controlling person of Wexford GP, be deemed to own beneficially the securities held by the Wexford Entities.

F4 · ownership.nature: Each of Wexford Capital, Wexford GP, Davidson and Jacobs share the power to vote and to dispose of the securities held by the Wexford Entities. Each of Wexford Capital, Wexford GP, Davidson and Jacobs disclaim beneficial ownership of the securities held by the Wexford Entities and this report shall not be deemed as an admission that they are the beneficial owners of such securities, except to the extent of any pecuniary interests therein. The Reporting Persons may be deemed to be directors by deputization by virtue of Paul Jacobi and Arthur Amron, each an employee of Wexford Capital, serving as directors of the Issuer.

SEC source: 0001048462-22-000011 · form4.xml · nonDerivative · entry 3

WEXFORD CAPITAL LP · CIK 0001048462 · Director · 10% owner

Wexford GP LLC · CIK 0001472112 · Director · 10% owner

DAVIDSON CHARLES E · CIK 0001001391 · Director · 10% owner

JACOBS JOSEPH · CIK 0001048485 · Director · 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: 22,337,941

F3 · price: Represents a weighted average price. These shares of common stock were purchased in multiple transactions at prices ranging from $2.4497 to $2.4566, inclusive. The Reporting Persons, as defined below, undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth herein

F4 · ownership.nature: Wexford Capital LP ("Wexford Capital") may, by reason of its status as (i) sub-advisor of each of Wexford Spectrum Trading Limited ("WST") and Wexford Catalyst Trading Limited ("WCT") and (ii) manager of each of Wexford Focused Investors LLC ("WFI") and MEH SUB LLC ("MEH", and together with WST, WCT and WFI, the "Wexford Entities"), be deemed to own beneficially the securities held by the Wexford Entities. Wexford GP LLC ("Wexford GP") may, as the General Partner of Wexford Capital, be deemed to own beneficially the securities held by the Wexford Entities. Each of Charles E. Davidson ("Davidson") and Joseph M. Jacobs ("Jacobs", and together with the Wexford Entities, Wexford Capital, Wexford GP and Davidson, the "Reporting Persons") may, by reason of his status as a controlling person of Wexford GP, be deemed to own beneficially the securities held by the Wexford Entities.

F5 · ownership.nature: Each of Wexford Capital, Wexford GP, Davidson and Jacobs share the power to vote and to dispose of the securities held by the Wexford Entities. Each of Wexford Capital, Wexford GP, Davidson and Jacobs disclaim beneficial ownership of the securities held by the Wexford Entities and this report shall not be deemed as an admission that they are the beneficial owners of such securities, except to the extent of any pecuniary interests therein. The Reporting Persons may be deemed to be directors by deputization by virtue of Paul Jacobi and Arthur Amron, each an employee of Wexford Capital, serving as directors of the Issuer.

SEC source: 0001048462-22-000011 · form4.xml · nonDerivative · entry 2

WEXFORD CAPITAL LP · CIK 0001048462 · Director · 10% owner

Wexford GP LLC · CIK 0001472112 · Director · 10% owner

DAVIDSON CHARLES E · CIK 0001001391 · Director · 10% owner

JACOBS JOSEPH · CIK 0001048485 · Director · 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: 22,283,162

F2 · price: Represents a weighted average price. These shares of common stock were purchased in multiple transactions at prices ranging from $2.4646 to $2.4846, inclusive. The Reporting Persons, as defined below, undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth herein.

F4 · ownership.nature: Wexford Capital LP ("Wexford Capital") may, by reason of its status as (i) sub-advisor of each of Wexford Spectrum Trading Limited ("WST") and Wexford Catalyst Trading Limited ("WCT") and (ii) manager of each of Wexford Focused Investors LLC ("WFI") and MEH SUB LLC ("MEH", and together with WST, WCT and WFI, the "Wexford Entities"), be deemed to own beneficially the securities held by the Wexford Entities. Wexford GP LLC ("Wexford GP") may, as the General Partner of Wexford Capital, be deemed to own beneficially the securities held by the Wexford Entities. Each of Charles E. Davidson ("Davidson") and Joseph M. Jacobs ("Jacobs", and together with the Wexford Entities, Wexford Capital, Wexford GP and Davidson, the "Reporting Persons") may, by reason of his status as a controlling person of Wexford GP, be deemed to own beneficially the securities held by the Wexford Entities.

F5 · ownership.nature: Each of Wexford Capital, Wexford GP, Davidson and Jacobs share the power to vote and to dispose of the securities held by the Wexford Entities. Each of Wexford Capital, Wexford GP, Davidson and Jacobs disclaim beneficial ownership of the securities held by the Wexford Entities and this report shall not be deemed as an admission that they are the beneficial owners of such securities, except to the extent of any pecuniary interests therein. The Reporting Persons may be deemed to be directors by deputization by virtue of Paul Jacobi and Arthur Amron, each an employee of Wexford Capital, serving as directors of the Issuer.

SEC source: 0001048462-22-000011 · form4.xml · nonDerivative · entry 1

WEXFORD CAPITAL LP · CIK 0001048462 · Director · 10% owner

Wexford GP LLC · CIK 0001472112 · Director · 10% owner

DAVIDSON CHARLES E · CIK 0001001391 · Director · 10% owner

JACOBS JOSEPH · CIK 0001048485 · Director · 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: 22,255,673

F1 · price: Represents a weighted average price. These shares of common stock were purchased in multiple transactions at prices ranging from $2.4640 to $2.4983, inclusive. The Reporting Persons, as defined below, undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth herein.

F4 · ownership.nature: Wexford Capital LP ("Wexford Capital") may, by reason of its status as (i) sub-advisor of each of Wexford Spectrum Trading Limited ("WST") and Wexford Catalyst Trading Limited ("WCT") and (ii) manager of each of Wexford Focused Investors LLC ("WFI") and MEH SUB LLC ("MEH", and together with WST, WCT and WFI, the "Wexford Entities"), be deemed to own beneficially the securities held by the Wexford Entities. Wexford GP LLC ("Wexford GP") may, as the General Partner of Wexford Capital, be deemed to own beneficially the securities held by the Wexford Entities. Each of Charles E. Davidson ("Davidson") and Joseph M. Jacobs ("Jacobs", and together with the Wexford Entities, Wexford Capital, Wexford GP and Davidson, the "Reporting Persons") may, by reason of his status as a controlling person of Wexford GP, be deemed to own beneficially the securities held by the Wexford Entities.

F5 · ownership.nature: Each of Wexford Capital, Wexford GP, Davidson and Jacobs share the power to vote and to dispose of the securities held by the Wexford Entities. Each of Wexford Capital, Wexford GP, Davidson and Jacobs disclaim beneficial ownership of the securities held by the Wexford Entities and this report shall not be deemed as an admission that they are the beneficial owners of such securities, except to the extent of any pecuniary interests therein. The Reporting Persons may be deemed to be directors by deputization by virtue of Paul Jacobi and Arthur Amron, each an employee of Wexford Capital, serving as directors of the Issuer.

SEC source: 0001679268-22-000008 · wf-form4_164703428751972.xml · nonDerivative · entry 1

Layton Mark E. · CIK 0001687210 · CFO and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 455,360

F1 · shares: These shares were sold to satisfy tax withholding obligations incurred in connection with the vesting of restricted stock units previously granted under the issuer's equity incentive plan.

F2 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $2.00 per share to $2.11 per share, inclusive. The reporting person undertakes to provide to Mammoth Energy Services, Inc., any security holder of Mammoth Energy Services, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

SEC source: 0001679268-21-000071 · wf-form4_163951603790394.xml · nonDerivative · entry 1

SMITH ARTHUR L · CIK 0001034323 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 180,326

SEC source: 0001679268-22-000002 · wf-form5_164487282832801.xml · nonDerivative · entry 2

SMITH ARTHUR L · CIK 0001034323 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 137,706

SEC source: 0001679268-22-000002 · wf-form5_164487282832801.xml · nonDerivative · entry 1

SMITH ARTHUR L · CIK 0001034323 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 167,540

SEC source: 0001679268-21-000037 · wf-form4_162284012833757.xml · nonDerivative · entry 1

SMITH ARTHUR L · CIK 0001034323 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 155,326

F1 · shares: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant. These securities will vest on the earlier of June 2, 2022 and the date of the issuer's 2022 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer.

SEC source: 0001679268-21-000033 · wf-form4_162283983655667.xml · nonDerivative · entry 1

AMRON ARTHUR H · CIK 0001179697 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,641

F1 · shares: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant. These securities will vest on the earlier of June 2, 2022 and the date of the issuer's 2022 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer. These restricted stock units have been assigned to Wexford Capital LP under the terms of Mr. Amron's employment with Wexford Capital LP. As a result, Mr. Amron disclaims any interest in these restricted stock units, except for his pecuniary interest therein.

F1 · balance_after: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant. These securities will vest on the earlier of June 2, 2022 and the date of the issuer's 2022 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer. These restricted stock units have been assigned to Wexford Capital LP under the terms of Mr. Amron's employment with Wexford Capital LP. As a result, Mr. Amron disclaims any interest in these restricted stock units, except for his pecuniary interest therein.

SEC source: 0001679268-21-000035 · wf-form4_162283997497613.xml · nonDerivative · entry 1

Jacobi Paul M. · CIK 0001477880 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,641

F1 · shares: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant. These securities will vest on the earlier of June 2, 2022 and the date of the issuer's 2022 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer. These restricted stock units have been assigned to Wexford Capital LP under the terms of Mr. Jacobi's employment with Wexford Capital LP. As a result, Mr. Jacobi disclaims any interest in these restricted stock units, except for his pecuniary interest therein.

F1 · balance_after: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant. These securities will vest on the earlier of June 2, 2022 and the date of the issuer's 2022 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer. These restricted stock units have been assigned to Wexford Capital LP under the terms of Mr. Jacobi's employment with Wexford Capital LP. As a result, Mr. Jacobi disclaims any interest in these restricted stock units, except for his pecuniary interest therein.

SEC source: 0001679268-21-000034 · wf-form4_162283992849522.xml · nonDerivative · entry 1

Palm James D · CIK 0001346557 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 142,816

F1 · shares: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant. These securities will vest on the earlier of June 2, 2022 and the date of the issuer's 2022 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer.

SEC source: 0001679268-21-000036 · wf-form4_162284007499371.xml · nonDerivative · entry 1

Booker Corey J. · CIK 0001821262 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 79,259

F1 · shares: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant. These securities will vest on the earlier of June 2, 2022 and the date of the issuer's 2022 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer.

SEC source: 0001679268-21-000010 · wf-form4_161550265401624.xml · nonDerivative · entry 1

Layton Mark E. · CIK 0001687210 · CFO and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 495,777

F1 · shares: These shares were sold to satisfy tax withholding obligations incurred in connection with the vesting of restricted stock units previously granted under the issuer's equity incentive plan.

F2 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $5.06 per share to $5.43 per share, inclusive. The reporting person undertakes to provide to Mammoth Energy Services, Inc., any security holder of Mammoth Energy Services, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

SEC source: 0001679268-21-000009 · wf-form4_161550258044814.xml · nonDerivative · entry 2

Straehla Arty · CIK 0001450919 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,331,327

F1 · shares: These shares were sold to satisfy tax withholding obligations incurred in connection with the vesting of restricted stock units previously granted under the issuer's equity incentive plan.

F3 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $5.11 per share to $5.45 per share, inclusive.

SEC source: 0001679268-21-000009 · wf-form4_161550258044814.xml · nonDerivative · entry 1

Straehla Arty · CIK 0001450919 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,433,762

F1 · shares: These shares were sold to satisfy tax withholding obligations incurred in connection with the vesting of restricted stock units previously granted under the issuer's equity incentive plan.

F2 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $5.30 per share to $5.63 per share, inclusive. The reporting person undertakes to provide to Mammoth Energy Services, Inc., any security holder of Mammoth Energy Services, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes 2 and 3 of this Form 4.

SEC source: 0001679268-20-000078 · wf-form4_160530178806462.xml · nonDerivative · entry 1

Straehla Arty · CIK 0001450919 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,480,317

F1 · shares: These shares were sold by the reporting person for tax purposes.

F2 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $1.76 per share to $1.79 per share, inclusive. The reporting person undertakes to provide to Mammoth Energy Services, Inc. any security holder of Mammoth Energy Services, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.

SEC source: 0001679268-20-000069 · wf-form4_159959570088899.xml · nonDerivative · entry 1

SMITH ARTHUR L · CIK 0001034323 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 129,685

SEC source: 0001821262-20-000005 · wf-form4_159786876159723.xml · nonDerivative · entry 1

Booker Corey J. · CIK 0001821262 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 53,618

F1 · shares: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant, pro-rated for the period beginning on August 17, 2020 and ending on July 2, 2021. These securities will vest on the earlier of July 2, 2021 and the date of the issuer's 2021 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer.

SEC source: 0001679268-20-000054 · wf-form4_159415214009854.xml · nonDerivative · entry 1

SMITH ARTHUR L · CIK 0001034323 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 109,685

F1 · shares: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant. These securities will vest on the earlier of July 2, 2021 and the date of the issuer's 2021 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer.

SEC source: 0001048462-20-000010 · form4.xml · nonDerivative · entry 1

AMRON ARTHUR H · CIK 0001179697 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 86,957

F1 · security: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant. These securities will vest on the earlier of July 2, 2021 and the date of the issuer's 2021 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer. These restricted stock units have been assigned to Wexford Capital LP under the terms of Mr. Amron's employment with Wexford Capital LP. As a result, Mr. Amron disclaims any interest in these restricted stock units, except for his pecuniary interest therein.

F1 · shares: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant. These securities will vest on the earlier of July 2, 2021 and the date of the issuer's 2021 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer. These restricted stock units have been assigned to Wexford Capital LP under the terms of Mr. Amron's employment with Wexford Capital LP. As a result, Mr. Amron disclaims any interest in these restricted stock units, except for his pecuniary interest therein.

F1 · balance_after: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant. These securities will vest on the earlier of July 2, 2021 and the date of the issuer's 2021 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer. These restricted stock units have been assigned to Wexford Capital LP under the terms of Mr. Amron's employment with Wexford Capital LP. As a result, Mr. Amron disclaims any interest in these restricted stock units, except for his pecuniary interest therein.

SEC source: 0001048462-20-000011 · form4.xml · nonDerivative · entry 1

Jacobi Paul M. · CIK 0001477880 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 86,957

F1 · security: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant. These securities will vest on the earlier of July 2, 2021 and the date of the issuer's 2021 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer. These restricted stock units have been assigned to Wexford Capital LP under the terms of Mr. Jacobi's employment with Wexford Capital LP. As a result, Mr. Jacobi disclaims any interest in these restricted stock units, except for his pecuniary interest therein.

F1 · shares: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant. These securities will vest on the earlier of July 2, 2021 and the date of the issuer's 2021 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer. These restricted stock units have been assigned to Wexford Capital LP under the terms of Mr. Jacobi's employment with Wexford Capital LP. As a result, Mr. Jacobi disclaims any interest in these restricted stock units, except for his pecuniary interest therein.

F1 · balance_after: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant. These securities will vest on the earlier of July 2, 2021 and the date of the issuer's 2021 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer. These restricted stock units have been assigned to Wexford Capital LP under the terms of Mr. Jacobi's employment with Wexford Capital LP. As a result, Mr. Jacobi disclaims any interest in these restricted stock units, except for his pecuniary interest therein.

SEC source: 0001679268-20-000053 · wf-form4_159415210480061.xml · nonDerivative · entry 1

Palm James D · CIK 0001346557 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 117,175

F1 · shares: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant. These securities will vest on the earlier of July 2, 2021 and the date of the issuer's 2021 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer.

SEC source: 0001679268-20-000007 · wf-form4_158335688545162.xml · nonDerivative · entry 1

Layton Mark E. · CIK 0001687210 · CFO and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 551,566

F1 · shares: These securities are restricted stock units that were granted under the Issuer's 2016 Equity Inventive Plan. All of these units will vest in four equal annual installments beginning on March 3, 2020. Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer.

SEC source: 0001679268-20-000009 · wf-form4_158335702801100.xml · nonDerivative · entry 1

Straehla Arty · CIK 0001450919 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,485,317

F1 · shares: These securities are restricted stock units that were granted under the Issuer's 2016 Equity Inventive Plan. All of these units will vest in four equal annual installments beginning on March 3, 2020. Each restricted stock unit represents a contingent right to receive one share of common stock of the Issuer.

SEC source: 0001679268-19-000042 · wf-form4_157445682478971.xml · nonDerivative · entry 1

Ross Matthew · CIK 0001689613 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,815

SEC source: 0001048462-19-000065 · form4.xml · nonDerivative · entry 1

WEXFORD CAPITAL LP · CIK 0001048462 · Director · 10% owner

Wexford Catalyst Trading LTD · CIK 0001415181 · Director · 10% owner

Wexford Spectrum Trading LTD · CIK 0001415180 · Director · 10% owner

MEH SUB LLC · CIK 0001710079 · Director · 10% owner

Wexford GP LLC · CIK 0001472112 · Director · 10% owner

DAVIDSON CHARLES E · CIK 0001001391 · Director · 10% owner

JACOBS JOSEPH · CIK 0001048485 · Director · 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: 22,045,273

F1 · shares: Represents the common stock of the Issuer acquired by Wexford Catalyst Trading Limited ("WCT").

F2 · price: Represents a weighted average price. These shares of common stock were purchased in multiple transactions at prices ranging from $1.3058 to $1.3494, inclusive. The Reporting Persons, as defined below, undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth herein.

F3 · balance_after: Represents the common stock of the Issuer held in the aggregate by Wexford Spectrum Trading Limited ("WST"), WCT, MEH SUB LLC ("MEH", and together with WST and WCT, the "Wexford Entities") and Wexford Capital LP ("Wexford Capital").

F4 · ownership.direct: Wexford Capital may, by reason of its status as (i) sub-advisor of each of WST and WCT and (ii) manager of MEH, be deemed to own beneficially the securities of which the Wexford Entities possess beneficial ownership. Wexford GP LLC ("Wexford GP") may, as the General Partner of Wexford Capital, be deemed to own beneficially the securities of which the Wexford Entities possess beneficial ownership. Each of Charles E. Davidson ("Davidson") and Joseph M. Jacobs ("Jacobs", and together with the Wexford Entities, Wexford Capital, Wexford GP and Davidson, the "Reporting Persons") may, by reason of his status as a controlling person of Wexford GP, be deemed to own beneficially the securities of which the Wexford Entities possess beneficial ownership.

F5 · ownership.direct: Each of Wexford Capital, Wexford GP, Davidson and Jacobs share the power to vote and to dispose of the securities beneficially owned by the Wexford Entities. Each of Wexford Capital, Wexford GP, Davidson and Jacobs disclaim beneficial ownership of the securities owned by the Wexford Entities and this report shall not be deemed as an admission that they are the beneficial owners of such securities, except to the extent of any pecuniary interests therein. The Reporting Persons may be deemed to be directors by deputization by virtue of Marc McCarthy and Arthur Amron, each an employee of Wexford Capital, serving as directors of the Issuer.

F1 · ownership.nature: Represents the common stock of the Issuer acquired by Wexford Catalyst Trading Limited ("WCT").

SEC source: 0001368388-19-000008 · wf-form4_157428462030532.xml · nonDerivative · entry 1

YELLEN JONATHAN H · CIK 0001368388 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 36,674

F1 · shares: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant, pro-rated for the period beginning on November 18, 2019 and ending on June 5, 2020. These securities will vest on the earlier of June 5, 2020 and the date of the issuer's 2020 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer.

SEC source: 0001048462-19-000063 · form4.xml · nonDerivative · entry 1

WEXFORD CAPITAL LP · CIK 0001048462 · Director · 10% owner

Wexford Spectrum Trading LTD · CIK 0001415180 · Director · 10% owner

Wexford Catalyst Trading LTD · CIK 0001415181 · Director · 10% owner

MEH SUB LLC · CIK 0001710079 · Director · 10% owner

Wexford GP LLC · CIK 0001472112 · Director · 10% owner

DAVIDSON CHARLES E · CIK 0001001391 · Director · 10% owner

JACOBS JOSEPH · CIK 0001048485 · Director · 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: 22,028,581

F1 · shares: Represents the common stock of the Issuer acquired in the aggregate by Wexford Spectrum Trading Limited ("WST") and Wexford Catalyst Trading Limited ("WCT").

F2 · price: Represents a weighted average price. These shares of common stock were purchased in multiple transactions at prices ranging from $1.3600 to $1.3629, inclusive. The Reporting Persons, as defined below, undertake to provide to the Issuer, any security holder of the Issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth herein.

F3 · balance_after: Represents the common stock of the Issuer held in the aggregate by WST, WCT, MEH SUB LLC ("MEH", and together with WST and WCT, the "Wexford Entities") and Wexford Capital LP ("Wexford Capital").

F4 · ownership.direct: Wexford Capital may, by reason of its status as (i) sub-advisor of each of WST and WCT and (ii) manager of MEH, be deemed to own beneficially the securities of which the Wexford Entities possess beneficial ownership. Wexford GP LLC ("Wexford GP") may, as the General Partner of Wexford Capital, be deemed to own beneficially the securities of which the Wexford Entities possess beneficial ownership. Each of Charles E. Davidson ("Davidson") and Joseph M. Jacobs ("Jacobs", and together with the Wexford Entities, Wexford Capital, Wexford GP and Davidson, the "Reporting Persons") may, by reason of his status as a controlling person of Wexford GP, be deemed to own beneficially the securities of which the Wexford Entities possess beneficial ownership.

F5 · ownership.direct: Each of Wexford Capital, Wexford GP, Davidson and Jacobs share the power to vote and to dispose of the securities beneficially owned by the Wexford Entities. Each of Wexford Capital, Wexford GP, Davidson and Jacobs disclaim beneficial ownership of the securities owned by the Wexford Entities and this report shall not be deemed as an admission that they are the beneficial owners of such securities, except to the extent of any pecuniary interests therein. The Reporting Persons may be deemed to be directors by deputization by virtue of Marc McCarthy and Arthur Amron, each an employee of Wexford Capital, serving as directors of the Issuer.

F1 · ownership.nature: Represents the common stock of the Issuer acquired in the aggregate by Wexford Spectrum Trading Limited ("WST") and Wexford Catalyst Trading Limited ("WCT").

SEC source: 0001679268-19-000024 · wf-form4_155993859252331.xml · nonDerivative · entry 1

SMITH ARTHUR L · CIK 0001034323 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,728

F1 · shares: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant. These securities will vest on the earlier of June 5, 2020 and the date of the issuer's 2020 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer.

SEC source: 0001679268-19-000022 · wf-form4_155993836190276.xml · nonDerivative · entry 1

Heerwagen Paul K IV · CIK 0001694037 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,493

F1 · shares: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant. These securities will vest on the earlier of June 5, 2020 and the date of the issuer's 2020 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer. These restricted stock units have been assigned to Gulfport Energy Corporation under the terms of Mr. Heerwagen's employment with Gulfport Energy Corporation. As a result, Mr. Heerwagen disclaims any pecuniary interest in these restricted stock units.

F1 · balance_after: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant. These securities will vest on the earlier of June 5, 2020 and the date of the issuer's 2020 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer. These restricted stock units have been assigned to Gulfport Energy Corporation under the terms of Mr. Heerwagen's employment with Gulfport Energy Corporation. As a result, Mr. Heerwagen disclaims any pecuniary interest in these restricted stock units.

SEC source: 0001048462-19-000039 · form4.xml · nonDerivative · entry 1

AMRON ARTHUR H · CIK 0001179697 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,493

F1 · security: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant. These securities will vest on the earlier of June 5, 2020 and the date of the issuer's 2020 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer. These restricted stock units have been assigned to Wexford Capital LP under the terms of Mr. Amron's employment with Wexford Capital LP. As a result, Mr. Amron disclaims any interest in these restricted stock units, except for his pecuniary interest therein.

F1 · shares: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant. These securities will vest on the earlier of June 5, 2020 and the date of the issuer's 2020 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer. These restricted stock units have been assigned to Wexford Capital LP under the terms of Mr. Amron's employment with Wexford Capital LP. As a result, Mr. Amron disclaims any interest in these restricted stock units, except for his pecuniary interest therein.

F1 · balance_after: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant. These securities will vest on the earlier of June 5, 2020 and the date of the issuer's 2020 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer. These restricted stock units have been assigned to Wexford Capital LP under the terms of Mr. Amron's employment with Wexford Capital LP. As a result, Mr. Amron disclaims any interest in these restricted stock units, except for his pecuniary interest therein.

SEC source: 0001679268-19-000023 · wf-form4_155993846319205.xml · nonDerivative · entry 1

Ross Matthew · CIK 0001689613 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 22,728

F1 · shares: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant. These securities will vest on the earlier of June 5, 2020 and the date of the issuer's 2020 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer.

SEC source: 0001048462-19-000038 · form4.xml · nonDerivative · entry 1

McCarthy Marc T · CIK 0001471993 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,493

F1 · security: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant. These securities will vest on the earlier of June 5, 2020 and the date of the issuer's 2020 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer. These restricted stock units have been assigned to Wexford Capital LP under the terms of Mr. McCarthy's employment with Wexford Capital LP. As a result, Mr. McCarthy disclaims any interest in these restricted stock units, except for his pecuniary interest therein

F1 · shares: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant. These securities will vest on the earlier of June 5, 2020 and the date of the issuer's 2020 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer. These restricted stock units have been assigned to Wexford Capital LP under the terms of Mr. McCarthy's employment with Wexford Capital LP. As a result, Mr. McCarthy disclaims any interest in these restricted stock units, except for his pecuniary interest therein

F1 · balance_after: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant. These securities will vest on the earlier of June 5, 2020 and the date of the issuer's 2020 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer. These restricted stock units have been assigned to Wexford Capital LP under the terms of Mr. McCarthy's employment with Wexford Capital LP. As a result, Mr. McCarthy disclaims any interest in these restricted stock units, except for his pecuniary interest therein

SEC source: 0001679268-19-000025 · wf-form4_155993869138180.xml · nonDerivative · entry 1

Palm James D · CIK 0001346557 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 30,218

F1 · shares: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant. These securities will vest on the earlier of June 5, 2020 and the date of the issuer's 2020 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer.

SEC source: 0001048462-19-000006 · form4.xml · nonDerivative · entry 1

AMRON ARTHUR H · CIK 0001179697 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,549

F1 · security: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant, pro-rated for the period beginning on January 25, 2019 and ending on June 7, 2019. These securities will vest on the earlier of June 7, 2019 or the date of the issuer's 2019 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer. These restricted stock units have been assigned to Wexford Capital LP under the terms of Mr. Amron's employment with Wexford Capital LP. As a result, Mr. Amron disclaims any interest in these restricted stock units, except for his pecuniary interest therein.

F1 · shares: These securities are restricted stock units that were granted under the issuer's equity incentive plan, representing an annual non-employee director grant, pro-rated for the period beginning on January 25, 2019 and ending on June 7, 2019. These securities will vest on the earlier of June 7, 2019 or the date of the issuer's 2019 Annual Meeting of Stockholders. Each restricted stock unit represents a contingent right to receive one share of common stock, par value $0.01 per share, of the issuer. These restricted stock units have been assigned to Wexford Capital LP under the terms of Mr. Amron's employment with Wexford Capital LP. As a result, Mr. Amron disclaims any interest in these restricted stock units, except for his pecuniary interest therein.

SEC source: 0001628280-18-014863 · wf-form4_154413031095201.xml · nonDerivative · entry 1

SMITH ARTHUR L · CIK 0001034323 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · By Arthur L. Smith Family LP

Disclosed balance after: 0

F1 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $24.82 per share to $24.90 per share, inclusive.

F2 · ownership.direct: These shares of common stock were held by Arthur L. Smith Family LP, which is managed by Arthur L. Smith Management LLC, of which Mr. Smith is the manager.

F2 · ownership.nature: These shares of common stock were held by Arthur L. Smith Family LP, which is managed by Arthur L. Smith Management LLC, of which Mr. Smith is the manager.

SEC source: 0001450919-18-000003 · wf-form4_154214350923801.xml · nonDerivative · entry 3

Straehla Arty · CIK 0001450919 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 185,317

F1 · shares: These shares were sold to satisfy tax withholding obligations incurred in connection with the vesting of restricted stock units previously granted under the issuer's equity incentive plan.

F4 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $26.10 per share to $26.25 per share, inclusive.

SEC source: 0001687210-18-000002 · wf-form4_154214332519321.xml · nonDerivative · entry 2

Layton Mark E. · CIK 0001687210 · CFO and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 51,566

F1 · shares: These shares were sold to satisfy tax withholding obligations incurred in connection with the vesting of restricted stock units previously granted under the issuer's equity incentive plan.

F3 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $26.11 per share to $26.12 per share, inclusive.

SEC source: 0001687210-18-000002 · wf-form4_154214332519321.xml · nonDerivative · entry 1

Layton Mark E. · CIK 0001687210 · CFO and Secretary

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 51,708

F1 · shares: These shares were sold to satisfy tax withholding obligations incurred in connection with the vesting of restricted stock units previously granted under the issuer's equity incentive plan.

F2 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $27.05 per share to $27.275 per share, inclusive. The reporting person undertakes to provide to Mammoth Energy Services, Inc. any security holder of Mammoth Energy Services, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes 2 and 3 of this Form 4.

SEC source: 0001450919-18-000003 · wf-form4_154214350923801.xml · nonDerivative · entry 2

Straehla Arty · CIK 0001450919 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 187,547

F1 · shares: These shares were sold to satisfy tax withholding obligations incurred in connection with the vesting of restricted stock units previously granted under the issuer's equity incentive plan.

F3 · price: The price reported in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $27.26 per share to $27.32 per share, inclusive.