Sec Form 4/A Filing - STEWART JAMES CARL @ PATTERSON UTI ENERGY INC - 2023-09-01

FORM 4/A Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person STEWART JAMES CARL 2. Issuer Name and Ticker or Trading Symbol PATTERSON UTI ENERGY INC [ PTEN] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 10713 W SAM HOUSTON PKWY N, SUITE 800 3. Date of Earliest Transaction (MM/DD/YY) 09/01/2023 (Street) HOUSTON, TX77064 4. If Amendment, Date Original Filed (MM/DD/YY) 09/06/2023 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock, $.01 par value per share 09/01/2023 A 96,235 A 96,235 D Common Stock, $.01 par value per share 09/01/2023 A 1,339,754 A 1,339,754 I By JCS Partners LP ( 3 )

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Stock Option (Right to Buy) $ 20.79 09/01/2023 A 134,683 ( 4 ) 09/01/2023 03/01/2024 Common Stock, $.01 par value per share 134,683 ( 4 ) ( 5 ) 134,683 ( 4 ) D Stock Option (Right to Buy) $ 18.85 09/01/2023 A 23,093 ( 4 ) 09/01/2023 08/06/2024( 4 ) Common Stock, $.01 par value per share 23,093 ( 4 ) ( 6 ) 23,093 ( 4 ) D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other STEWART JAMES CARL 10713 W SAM HOUSTON PKWY N SUITE 800 HOUSTON, TX77064 X Signatures By Forrest Robinson pursuant to a limited power of attorney filed with the SEC on 09/06/2023 /s/Forrest Robinson 03/04/2024 Signature of Reporting Person Date

Explanation of Responses:

( 1 )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. ( 2 )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. ( 3 )Held by JCS Partners LP, a limited partnership over which the reporting person exercises ownership and control. ( 4 )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. ( 5 )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. ( 6 )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.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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