Statement of Changes in Beneficial Ownership (Form 4)

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b). Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

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

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1. Name and Address of Reporting Person * SIVER DARRIN C 2. Issuer Name and Ticker or Trading Symbol PACCAR INC [PCAR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) EXECUTIVE VICE PRESIDENT (Last) (First) (Middle) 777 - 106TH AVE. N.E. 3. Date of Earliest Transaction (Month/Day/Year) 09/04/2025 (Street) BELLEVUE, WA 98004 4. If Amendment, Date Original Filed (Month/Day/Year) 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 (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 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 09/04/2025 J(1) 82.995 A $98.21 24,569.651(2) I By PACCAR Savings Investment Plan (SIP) Common Stock 62,122 D

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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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 (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

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 (Month/Day/Year)

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 Units (DCP)

(3)

09/04/2025

J(4)

65.781

(3)

(3)

Common Stock

65.781

$98.21

19,642.628(5)

D

Stock Option

$71.95

01/01/2026

02/08/2033

Common Stock

38,900

38,900

D

Stock Option

$104.16

01/01/2027

02/05/2034

Common Stock

28,610

28,610

D

Stock Option

$109.13

01/01/2028

02/03/2035

Common Stock

25,460

25,460

D

Stock Units (LTIP)

(6)

(6)

(6)

Common Stock

11,669

11,669

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
SIVER DARRIN C 777 - 106TH AVE. N.E. BELLEVUE, WA 98004			EXECUTIVE VICE PRESIDENT

Signatures

Michael R. Beers, by Power of Attorney		09/05/2025
**Signature of Reporting Person		Date

Explanation of Responses:

*	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).
(1)	Dividend on PACCAR Savings Investment Plan (SIP) shares reinvested pursuant to SIP.
(2)	Balance includes shares awarded under PACCAR Savings Investment Plan (Company match) in exempt transaction(s) under Rule16b-3(c) and Rule 16b-3(d).
(3)	Share units held in deferred phantom stock account under PACCAR Deferred Compensation Plan (DCP) convertible to common stock on a one-for-one basis upon satisfaction of all applicable conditions.
(4)	Dividend on share units held in deferred phantom stock account under PACCAR Deferred Compensation Plan (DCP) reinvested pursuant to DCP.
(5)	Balance includes stock units deferred under PACCAR Deferred Compensation Plan in exempt transaction(s) under Rule16b-3(c) and Rule 16b-3(d).
(6)	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.

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