Sec Form 4 Filing - FEIGHT R PRESTON @ PACCAR INC - 2024-02-05

FORM 4 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 FEIGHT R PRESTON 2. Issuer Name and Ticker or Trading Symbol PACCAR INC [ PCAR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) CHIEF EXECUTIVE OFFICER (Last) (First) (Middle) 777 - 106TH AVE. N.E. 3. Date of Earliest Transaction (MM/DD/YY) 02/05/2024 (Street) BELLEVUE, WA98004 4. If Amendment, Date Original Filed (MM/DD/YY) 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 145,495 D Common Stock 16,055.171 I By PACCAR Savings Investment Plan (SIP)

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 $ 104.16 02/05/2024 A( 1 ) 104,244 01/01/2027 02/05/2034 Common Stock 104,244 ( 1 ) 104,244 D Stock Units (LTIP) ( 2 ) 02/05/2024 A( 3 ) 43,436 ( 2 ) ( 2 ) Common Stock 43,436 $ 104.16 86,841 D Stock Option $ 61.26 01/01/2024 02/02/2031 Common Stock 108,571 108,571 D Stock Option $ 62.8667 01/01/2025 02/07/2032 Common Stock 136,440 136,440 D Stock Option $ 71.95 01/01/2026 02/08/2033 Common Stock 141,038 141,038 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other FEIGHT R PRESTON 777 - 106TH AVE. N.E. BELLEVUE, WA98004 X CHIEF EXECUTIVE OFFICER Signatures Michael R. Beers, by Power of Attorney 02/07/2024 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Option to buy awarded under PACCAR Long Term Incentive Plan (LTIP). ( 2 )Restricted stock units held in deferred phantom stock account under Long Term Incentive Plan (LTIP) convertible to common stock on a one-for-one basis upon satisfaction of all applicable vesting conditions. ( 3 )Restricted stock units awarded under PACCAR Long Term Incentive Plan (LTIP) and convertible to common stock on a one-for-one basis upon satisfaction of all applicable vesting conditions. Each award vests in four equal installments commencing on March 1 following the award and January 1 of the next three years.

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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