STEWART JAMES CARL

SEC source: 0001702981-26-000003 · wk-form4_1787775937.xml · nonDerivative · entry 1

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By JCS Partners LP

Disclosed balance after: 0

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $11.50 to $11.60, inclusive. The Reporting Person undertakes to provide to Patterson-UTI Energy, Inc., any security holder of Patterson-UTI Energy, 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.

F2 · ownership.nature: Held by JCS Partners LP, a limited partnership over which the reporting person exercises ownership and control.

SEC source: 0001702981-26-000002 · wk-form4_1767661556.xml · nonDerivative · entry 1

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 114,116

F1 · shares: Restricted stock units that convert into common stock on a one-for-one basis. One hundred percent (100%) of the restricted stock units vests on January 1, 2027.

SEC source: 0001702981-25-000005 · wk-form4_1766181556.xml · nonDerivative · entry 2

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By JCS Partners LP

Disclosed balance after: 207,000

F3 · price: The shares were sold by the Reporting Person for personal financial management purposes. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $5.80 to $5.97, inclusive. The Reporting Person undertakes to provide to Patterson-UTI Energy, Inc., any security holder of Patterson-UTI Energy, 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.

F2 · ownership.nature: Held by JCS Partners LP, a limited partnership over which the reporting person exercises ownership and control.

SEC source: 0001702981-25-000005 · wk-form4_1766181556.xml · nonDerivative · entry 1

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By JCS Partners LP

Disclosed balance after: 575,254

F1 · price: The shares were sold by the Reporting Person for personal financial management purposes. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $5.85 to $5.97, inclusive. The Reporting Person undertakes to provide to Patterson-UTI Energy, Inc., any security holder of Patterson-UTI Energy, 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.

F2 · ownership.nature: Held by JCS Partners LP, a limited partnership over which the reporting person exercises ownership and control.

SEC source: 0001628280-25-029333 · wk-form4_1749068421.xml · nonDerivative · entry 1

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By JCS Partners LP

Disclosed balance after: 925,254

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $5.43 to $5.58, inclusive. The Reporting Person undertakes to provide to Patterson-UTI Energy, Inc., any security holder of Patterson-UTI Energy, 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.

F2 · ownership.nature: Held by JCS Partners LP, a limited partnership over which the reporting person exercises ownership and control.

SEC source: 0001628280-25-025279 · wk-form4_1747186547.xml · nonDerivative · entry 1

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By JCS Partners LP

Disclosed balance after: 999,754

F1 · ownership.nature: Held by JCS Partners LP, a limited partnership over which the reporting person exercises ownership and control.

SEC source: 0000889900-25-000041 · wk-form4_1741723770.xml · nonDerivative · entry 2

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By JCS Partners LP

Disclosed balance after: 1,005,254

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $7.35 to $7.46, inclusive. The Reporting Person undertakes to provide to Patterson-UTI Energy, Inc., any security holder of Patterson-UTI Energy, 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.

F3 · ownership.nature: Held by JCS Partners LP, a limited partnership over which the reporting person exercises ownership and control.

SEC source: 0000889900-25-000041 · wk-form4_1741723770.xml · nonDerivative · entry 1

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 85,475

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $7.32 to $7.50, inclusive. The Reporting Person undertakes to provide to Patterson-UTI Energy, Inc., any security holder of Patterson-UTI Energy, 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: 0000889900-25-000015 · wk-form4_1735942596.xml · nonDerivative · entry 1

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 53,624

F1 · shares: Restricted stock units that convert into common stock on a one-for-one basis. One hundred percent (100%) of the restricted stock units vests on January 1, 2026.

SEC source: 0000889900-24-000018 · wk-form4_1734729570.xml · nonDerivative · entry 1

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 32,438

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $7.24 to $7.56, inclusive. The Reporting Person undertakes to provide to Patterson-UTI Energy, Inc., any security holder of Patterson-UTI Energy, 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: 0000889900-25-000040 · wk-form4a_1741723706.xml · nonDerivative · entry 1

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By JCS Partners LP

Disclosed balance after: 1,197,254

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $7.24 to $7.56, inclusive. The Reporting Person undertakes to provide to Patterson-UTI Energy, Inc., any security holder of Patterson-UTI Energy, 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.

F2 · ownership.nature: Held by JCS Partners LP, a limited partnership over which the reporting person exercises ownership and control.

SEC source: 0001209191-24-000575 · doc4.xml · nonDerivative · entry 1

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 112,438

F1 · shares: Restricted stock units that convert into common stock on a one-for-one basis. One hundred percent (100%) of the restricted stock units vests on January 1, 2025.

SEC source: 0001209191-23-049787 · doc4.xml · nonDerivative · entry 1

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By JCS Partners LP

Disclosed balance after: 1,277,254

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $15.79 to $16.14, inclusive. The Reporting Person undertakes to provide to Patterson-UTI Energy, Inc., any security holder of Patterson-UTI Energy, 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.

F2 · ownership.nature: Held by JCS Partners LP, a limited partnership over which the reporting person exercises ownership and control.

SEC source: 0001688476-23-000134 · wf-form4_169359993768919.xml · nonDerivative · entry 1

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F1 · price: Pursuant to the Agreement and Plan of Merger, dated as of June 14, 2023 and amended as of July 27, 2023, by and among Patterson-UTI Energy, Inc. ("Patterson-UTI"), Pecos Merger Sub Inc., Pecos Second Merger Sub LLC and NexTier Oilfield Solutions, Inc., each share was cancelled and converted into the right to receive 0.7520 shares of Patterson-UTI common stock at the effective date of the mergers contemplated thereby.

SEC source: 0001209191-23-048525 · doc4.xml · derivative · entry 3

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,092

Underlying: Common Stock, $.01 par value per share · 23,092 shares

Expires 2024-03-01

F4 · price: These fully vested stock options were acquired by the Reporting Person in the Mergers in exchange for stock options to purchase shares of common stock of NexTier for $14.17 per share held by the Reporting Person immediately prior to the Effective Time based on the Exchange Ratio.

SEC source: 0001209191-23-048525 · doc4.xml · derivative · entry 2

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 134,682

Underlying: Common Stock, $.01 par value per share · 134,682 shares

Expires 2024-03-01

F3 · price: These fully vested stock options were acquired by the Reporting Person in the Mergers in exchange for stock options to purchase shares of common stock of NexTier for $15.63 per share held by the Reporting Person immediately prior to the Effective Time based on the Exchange Ratio.

SEC source: 0001209191-23-048525 · doc4.xml · nonDerivative · entry 1

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,435,989

F1 · price: This Form 4 reports securities acquired in connection with the mergers (the "Mergers") contemplated by that certain Agreement and Plan of Merger (as amended, the "Merger Agreement"), dated as of June 14, 2023, by and among Patterson-UTI Energy, Inc. (the "Issuer"), certain subsidiaries of the Issuer, and NexTier Oilfield Solutions Inc. ("NexTier"). On September 1, 2023, as a result of the Mergers contemplated by the Merger Agreement, at the Effective Time (as defined in the Merger Agreement), each outstanding share of common stock of NexTier was converted automatically into the right to receive 0.7520 (the "Exchange Ratio") shares of common stock of the Issuer, with cash paid in lieu of the issuance of any fractional shares of the Issuer's common stock.

F2 · price: The shares of the Issuer's common stock reported above were acquired by the Reporting Person in respect of the shares of common stock of NexTier owned by the Reporting Person immediately prior to the Effective Time. On the trading day immediately prior to the Effective Time, the closing price of the Issuer's common stock was $14.14 per share and the closing price of NexTier's common stock was $10.61 per share.

SEC source: 0001209191-23-049784 · doc4a.xml · derivative · entry 4

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,092

Underlying: Common Stock, $.01 par value per share · 23,092 shares

Expires 2024-03-01

F5 · price: These fully vested stock options were acquired by the Reporting Person in the Mergers in exchange for stock options to purchase shares of common stock of NexTier for $14.17 per share held by the Reporting Person immediately prior to the Effective Time based on the Exchange Ratio.

SEC source: 0001209191-23-049784 · doc4a.xml · derivative · entry 3

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 134,682

Underlying: Common Stock, $.01 par value per share · 134,682 shares

Expires 2024-03-01

F4 · price: These fully vested stock options were acquired by the Reporting Person in the Mergers in exchange for stock options to purchase shares of common stock of NexTier for $15.63 per share held by the Reporting Person immediately prior to the Effective Time based on the Exchange Ratio.

SEC source: 0001209191-23-049784 · doc4a.xml · nonDerivative · entry 2

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By JCS Partners LP

Disclosed balance after: 1,339,754

F1 · price: This Form 4 reports securities acquired in connection with the mergers (the "Mergers") contemplated by that certain Agreement and Plan of Merger (as amended, the "Merger Agreement"), dated as of June 14, 2023, by and among Patterson-UTI Energy, Inc. (the "Issuer"), certain subsidiaries of the Issuer, and NexTier Oilfield Solutions Inc. ("NexTier"). On September 1, 2023, as a result of the Mergers contemplated by the Merger Agreement, at the Effective Time (as defined in the Merger Agreement), each outstanding share of common stock of NexTier was converted automatically into the right to receive 0.7520 (the "Exchange Ratio") shares of common stock of the Issuer, with cash paid in lieu of the issuance of any fractional shares of the Issuer's common stock.

F2 · price: The shares of the Issuer's common stock reported above were acquired by the Reporting Person in respect of the shares of common stock of NexTier owned by the Reporting Person immediately prior to the Effective Time. On the trading day immediately prior to the Effective Time, the closing price of the Issuer's common stock was $14.14 per share and the closing price of NexTier's common stock was $10.61 per share.

F3 · ownership.nature: Held by JCS Partners LP, a limited partnership over which the reporting person exercises ownership and control.

SEC source: 0001209191-23-049784 · doc4a.xml · nonDerivative · entry 1

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 96,235

F1 · price: This Form 4 reports securities acquired in connection with the mergers (the "Mergers") contemplated by that certain Agreement and Plan of Merger (as amended, the "Merger Agreement"), dated as of June 14, 2023, by and among Patterson-UTI Energy, Inc. (the "Issuer"), certain subsidiaries of the Issuer, and NexTier Oilfield Solutions Inc. ("NexTier"). On September 1, 2023, as a result of the Mergers contemplated by the Merger Agreement, at the Effective Time (as defined in the Merger Agreement), each outstanding share of common stock of NexTier was converted automatically into the right to receive 0.7520 (the "Exchange Ratio") shares of common stock of the Issuer, with cash paid in lieu of the issuance of any fractional shares of the Issuer's common stock.

F2 · price: The shares of the Issuer's common stock reported above were acquired by the Reporting Person in respect of the shares of common stock of NexTier owned by the Reporting Person immediately prior to the Effective Time. On the trading day immediately prior to the Effective Time, the closing price of the Issuer's common stock was $14.14 per share and the closing price of NexTier's common stock was $10.61 per share.

SEC source: 0001209191-24-004212 · doc4a.xml · derivative · entry 4

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,093

Underlying: Common Stock, $.01 par value per share · 23,093 shares

Expires 2024-08-06

F4 · shares: On September 6, 2023, the Reporting Person filed a Form 4 which inadvertently reported incorrect numbers of stock options acquired in the Mergers due to immaterial rounding errors and misstated the expiration date of certain stock options. These items have been corrected in this amendment, which reports 2 additional stock options.

F6 · price: These fully vested stock options were acquired by the Reporting Person in the Mergers in exchange for stock options to purchase shares of common stock of NexTier for $14.17 per share held by the Reporting Person immediately prior to the Effective Time based on the Exchange Ratio.

F4 · derivative.expiration_date: On September 6, 2023, the Reporting Person filed a Form 4 which inadvertently reported incorrect numbers of stock options acquired in the Mergers due to immaterial rounding errors and misstated the expiration date of certain stock options. These items have been corrected in this amendment, which reports 2 additional stock options.

F4 · derivative.underlying_shares: On September 6, 2023, the Reporting Person filed a Form 4 which inadvertently reported incorrect numbers of stock options acquired in the Mergers due to immaterial rounding errors and misstated the expiration date of certain stock options. These items have been corrected in this amendment, which reports 2 additional stock options.

F4 · balance_after: On September 6, 2023, the Reporting Person filed a Form 4 which inadvertently reported incorrect numbers of stock options acquired in the Mergers due to immaterial rounding errors and misstated the expiration date of certain stock options. These items have been corrected in this amendment, which reports 2 additional stock options.

SEC source: 0001209191-24-004212 · doc4a.xml · derivative · entry 3

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 134,683

Underlying: Common Stock, $.01 par value per share · 134,683 shares

Expires 2024-03-01

F4 · shares: On September 6, 2023, the Reporting Person filed a Form 4 which inadvertently reported incorrect numbers of stock options acquired in the Mergers due to immaterial rounding errors and misstated the expiration date of certain stock options. These items have been corrected in this amendment, which reports 2 additional stock options.

F5 · price: These fully vested stock options were acquired by the Reporting Person in the Mergers in exchange for stock options to purchase shares of common stock of NexTier for $15.63 per share held by the Reporting Person immediately prior to the Effective Time based on the Exchange Ratio.

F4 · derivative.underlying_shares: On September 6, 2023, the Reporting Person filed a Form 4 which inadvertently reported incorrect numbers of stock options acquired in the Mergers due to immaterial rounding errors and misstated the expiration date of certain stock options. These items have been corrected in this amendment, which reports 2 additional stock options.

F4 · balance_after: On September 6, 2023, the Reporting Person filed a Form 4 which inadvertently reported incorrect numbers of stock options acquired in the Mergers due to immaterial rounding errors and misstated the expiration date of certain stock options. These items have been corrected in this amendment, which reports 2 additional stock options.

SEC source: 0001209191-24-004212 · doc4a.xml · nonDerivative · entry 2

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By JCS Partners LP

Disclosed balance after: 1,339,754

F1 · price: The shares of the Issuer's common stock reported above were acquired by the Reporting Person in respect of the shares of common stock of NexTier owned by the Reporting Person immediately prior to the Effective Time. On the trading day immediately prior to the Effective Time, the closing price of the Issuer's common stock was $14.14 per share and the closing price of NexTier's common stock was $10.61 per share.

F2 · price: This Form 4 reports securities acquired in connection with the mergers (the "Mergers") contemplated by that certain Agreement and Plan of Merger (as amended, the "Merger Agreement"), dated as of June 14, 2023, by and among Patterson-UTI Energy, Inc. (the "Issuer"), certain subsidiaries of the Issuer, and NexTier Oilfield Solutions Inc. ("NexTier"). On September 1, 2023, as a result of the Mergers contemplated by the Merger Agreement, at the Effective Time (as defined in the Merger Agreement), each outstanding share of common stock of NexTier was converted automatically into the right to receive 0.7520 (the "Exchange Ratio") shares of common stock of the Issuer, with cash paid in lieu of the issuance of any fractional shares of the Issuer's common stock.

F3 · ownership.nature: Held by JCS Partners LP, a limited partnership over which the reporting person exercises ownership and control.

SEC source: 0001209191-24-004212 · doc4a.xml · nonDerivative · entry 1

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 96,235

F1 · price: The shares of the Issuer's common stock reported above were acquired by the Reporting Person in respect of the shares of common stock of NexTier owned by the Reporting Person immediately prior to the Effective Time. On the trading day immediately prior to the Effective Time, the closing price of the Issuer's common stock was $14.14 per share and the closing price of NexTier's common stock was $10.61 per share.

F2 · price: This Form 4 reports securities acquired in connection with the mergers (the "Mergers") contemplated by that certain Agreement and Plan of Merger (as amended, the "Merger Agreement"), dated as of June 14, 2023, by and among Patterson-UTI Energy, Inc. (the "Issuer"), certain subsidiaries of the Issuer, and NexTier Oilfield Solutions Inc. ("NexTier"). On September 1, 2023, as a result of the Mergers contemplated by the Merger Agreement, at the Effective Time (as defined in the Merger Agreement), each outstanding share of common stock of NexTier was converted automatically into the right to receive 0.7520 (the "Exchange Ratio") shares of common stock of the Issuer, with cash paid in lieu of the issuance of any fractional shares of the Issuer's common stock.

SEC source: 0001688476-23-000090 · wf-form4_168694503827811.xml · nonDerivative · entry 1

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,909,561

F1 · shares: Represents shares of restricted stock scheduled to vest 100% on the earliest of (i) the first anniversary of the grant date, (ii) the date of the first meeting of NexTier Oilfield Solutions Inc.'s (the "Company") stockholders at which directors will be elected in the calendar year following the calendar year in which the grant date occurs, or (iii) the date of any termination without cause, death, or a change in control, all subject to the grantee's continued service as a director to the Company.

SEC source: 0001688476-22-000145 · wf-form4_166811325016610.xml · nonDerivative · entry 2

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,890,788

F2 · price: The reporting person undertakes to provide to NexTier Oilfield Solutions Inc. (the "Company"), any security holder of the Company, 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 above.

F3 · price: This price is a weighted average price. These shares were sold in multiple transactions at prices ranging from $9.76 to $10.14, inclusive.

SEC source: 0001688476-22-000145 · wf-form4_166811325016610.xml · nonDerivative · entry 1

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,163,504

F1 · price: This price is a weighted average price. These shares were sold in multiple transactions at prices ranging from $10.25 to $10.43, inclusive.

F2 · price: The reporting person undertakes to provide to NexTier Oilfield Solutions Inc. (the "Company"), any security holder of the Company, 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 above.

SEC source: 0001688476-22-000122 · wf-form4_165549891484992.xml · nonDerivative · entry 1

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,290,788

F1 · shares: Represents shares of restricted stock scheduled to vest 100% on the earliest of (i) the first anniversary of the grant date, (ii) the date of the first meeting of NexTier Oilfield Solutions Inc.'s (the "Company") stockholders at which directors will be elected in the calendar year following the calendar year in which the grant date occurs, or (iii) the date of any termination without cause, death, or a change in control, all subject to the grantee's continued service as a director to the Company.

SEC source: 0001688476-22-000096 · wf-form4_165463574655124.xml · nonDerivative · entry 1

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,276,867

F1 · kind: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 14, 2022.

SEC source: 0001688476-22-000072 · wf-form4_164692067422394.xml · nonDerivative · entry 1

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,334,367

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $8.94 to $9.57, inclusive. The reporting person undertakes to provide to NexTier Oilfield Solutions Inc. (the "Company"), any security holder of the Company, 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 above.

SEC source: 0001688476-21-000096 · wf-form4_162394593293882.xml · nonDerivative · entry 1

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,484,367

F1 · shares: Represents (1) shares of restricted stock scheduled to vest 100% on the earliest of (i) the first anniversary of the grant date,(ii) the date of the first meeting of the Company's stockholders at which directors will be elected in the calendar year following the calendar year in which the grant date occurs, (iii) the date of any termination without cause, death, and a change in control, all subject to the grantee's continued service as a director to the Company; and (2) 20,884 shares granted as a stock payment award under the Company's equity plan that vest immediately.

SEC source: 0001688476-20-000068 · wf-form4_159259951155572.xml · nonDerivative · entry 1

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,455,371

F1 · shares: Represents shares of restricted stock scheduled to vest 100% on the earliest of (i) the first anniversary of the grant date,(ii) the date of the first meeting of the Company's stockholders at which directors will be elected in the calendar year following the calendar year in which the grant date occurs, (iii) the date of any termination without cause, death, and a change in control, all subject to the grantee's continued service as a director to the Company.

SEC source: 0001688476-21-000061 · wf-form4a_161981162950810.xml · nonDerivative · entry 1

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,434,487

F1 · shares: Represents shares of restricted stock scheduled to vest 100% on the earliest of (i) the first anniversary of the grant date,(ii) the date of the first meeting of the Company's stockholders at which directors will be elected in the calendar year following the calendar year in which the grant date occurs, (iii) the date of any termination without cause, death, and a change in control, all subject to the grantee's continued service as a director to the Company. This amended Form 4 corrects the number of restricted stock awards that were granted, which is lower than originally reported.

SEC source: 0001562180-20-002549 · primarydocument.xml · nonDerivative · entry 1

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,400,026

F1 · security: Represents shares of restricted stock scheduled to vest 100% on the earliest of (i) the first anniversary of the grant date, (ii) the date of the first meeting of the Company's stockholders at which directors will be elected in the calendar year following the calendar year in which the grant date occurs, (iii) the date of any termination without cause, death, and a change in control, all subject to the grantee's continued service as a director to the Company.

SEC source: 0001562180-19-005761 · primarydocument.xml · nonDerivative · entry 2

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · Indirect

Disclosed balance after: 2,359,487

F1 · kind: Pro-rata in-kind distribution from Keane Investor Holdings LLC to its members, including the reporting person and JS Keane Coinvestor, LLC (Coinvestor), without consideration.

F2 · ownership.nature: Held by Coinvestor, for which Little B Holdings, LLC, is its sole member, for which the reporting person serves as president and may be deemed to have voting and dispositive power with regard to the shares held by Coinvestor. The reporting person disclaims beneficial ownership of the shares held by Coinvestor except to the extent of his pecuniary interest therein.

SEC source: 0001562180-19-005761 · primarydocument.xml · nonDerivative · entry 1

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 2,328,238

F1 · kind: Pro-rata in-kind distribution from Keane Investor Holdings LLC to its members, including the reporting person and JS Keane Coinvestor, LLC (Coinvestor), without consideration.

SEC source: 0001562180-19-005385 · primarydocument.xml · nonDerivative · entry 2

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 217,869

SEC source: 0001562180-19-005385 · primarydocument.xml · nonDerivative · entry 1

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 260,785

F1 · security: Shares of common stock were acquired for no consideration upon the accelerated vesting of performance share awards at the discretion of the board in connection with the previously announced merger between C&J Energy Services, Inc. and Keane Group, Inc.

SEC source: 0001562180-19-005500 · primarydocument.xml · derivative · entry 3

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 447,292 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.

F1 · derivative.exercise_price: Restricted Stock Units convert into common stock on a one-for-one basis

F2 · derivative.exercise_date: Vesting of Restricted Stock Units was accelerated for no consideration at the discretion of the board in connection with the Reporting Person's termination without cause from employment with NexTier Oilfield Solutions Inc. The Reporting Person continues to serve as a non-employee director.

F2 · derivative.expiration_date: Vesting of Restricted Stock Units was accelerated for no consideration at the discretion of the board in connection with the Reporting Person's termination without cause from employment with NexTier Oilfield Solutions Inc. The Reporting Person continues to serve as a non-employee director.

SEC source: 0001562180-19-005500 · primarydocument.xml · nonDerivative · entry 2

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 489,149

SEC source: 0001562180-19-005500 · primarydocument.xml · nonDerivative · entry 1

STEWART JAMES CARL · CIK 0001702981 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 665,161

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 · security: Restricted Stock Units convert into common stock on a one-for-one basis

SEC source: 0001562180-19-001802 · primarydocument.xml · nonDerivative · entry 3

STEWART JAMES CARL · CIK 0001702981 · Director · Executive Chairman

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 151,723

F2 · kind: The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

F4 · price: The price reported in column 4 is an average price. The shares were sold in multiple transactions at prices ranging from $9.91 to $10.49. The Reporting Person undertakes to provide to the SEC, the Issuer or any shareholder of the Issuer, upon request, information regarding the number of shares sold at each separate price within the range set forth in this footnote.

SEC source: 0001562180-19-001802 · primarydocument.xml · nonDerivative · entry 2

STEWART JAMES CARL · CIK 0001702981 · Director · Executive Chairman

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 207,507

F2 · kind: The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.

F3 · price: The price reported in column 4 is an average price. The shares were sold in multiple transactions at prices ranging from $10.41 to $11.11. The Reporting Person undertakes to provide to the SEC, the Issuer or any shareholder of the Issuer, upon request, information regarding the number of shares sold at each separate price within the range set forth in this footnote.

SEC source: 0001562180-19-001802 · primarydocument.xml · nonDerivative · entry 1

STEWART JAMES CARL · CIK 0001702981 · Director · Executive Chairman

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 260,027

F1 · shares: Reflects a payment of shares of Company common stock with a fair market value on March 5, 2019, of $1,975,706, net of applicable withholding, pursuant to a Deferred Stock Award granted to the reporting person on March 16, 2017.

SEC source: 0001562180-19-001719 · primarydocument.xml · derivative · entry 4

STEWART JAMES CARL · CIK 0001702981 · Director · Executive Chairman

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 447,292

Underlying: Common Stock · 9,858 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.

F1 · derivative.exercise_price: Restricted Stock Units convert into common stock on a one-for-one basis.

F3 · derivative.exercise_date: On August 6, 2018, the reporting person was granted 29,576 shares that vested in three equal annual installments on each of March 1, 2019, 2020 and 2021.

F3 · derivative.expiration_date: On August 6, 2018, the reporting person was granted 29,576 shares that vested in three equal annual installments on each of March 1, 2019, 2020 and 2021.

SEC source: 0001562180-19-001719 · primarydocument.xml · derivative · entry 3

STEWART JAMES CARL · CIK 0001702981 · Director · Executive Chairman

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 457,150

Underlying: Common Stock · 50,733 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.

F1 · derivative.exercise_price: Restricted Stock Units convert into common stock on a one-for-one basis.

F2 · derivative.exercise_date: On March 1, 2018, the reporting person was granted 152,200 shares that vest in three equal annual installments on each of March 1, 2019, 2020 and 2021.

F2 · derivative.expiration_date: On March 1, 2018, the reporting person was granted 152,200 shares that vest in three equal annual installments on each of March 1, 2019, 2020 and 2021.

SEC source: 0001562180-19-001719 · primarydocument.xml · nonDerivative · entry 2

STEWART JAMES CARL · CIK 0001702981 · Director · Executive Chairman

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 146,663

SEC source: 0001562180-19-001719 · primarydocument.xml · nonDerivative · entry 1

STEWART JAMES CARL · CIK 0001702981 · Director · Executive Chairman

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 166,351

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: Restricted Stock Units convert into common stock on a one-for-one basis.

SEC source: 0001562180-19-001474 · primarydocument.xml · derivative · entry 1

STEWART JAMES CARL · CIK 0001702981 · Director · Executive Chairman

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 507,883

Underlying: Common Stock · 254,477 shares

Expires not disclosed

F1 · derivative.exercise_price: Each restricted stock unit represents a contingent right to receive one share of common stock of Keane Group, Inc.

F2 · derivative.exercise_date: The restricted stock units vest in three equal annual installments on each of February 27, 2020, 2021 and 2022. Vested shares will be delivered to the reporting person as soon as practicable following each vest date, but in no event later than March 15 following the end of the calendar year in which the shares vested.

F2 · derivative.expiration_date: The restricted stock units vest in three equal annual installments on each of February 27, 2020, 2021 and 2022. Vested shares will be delivered to the reporting person as soon as practicable following each vest date, but in no event later than March 15 following the end of the calendar year in which the shares vested.