Amendment to Statement of Changes in Beneficial Ownership (Form 4/A)

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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(Print or Type Responses)

1. Name and Address of Reporting Person * Soderberg John Lewis 2. Issuer Name and Ticker or Trading Symbol FASTENAL CO [FAST] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Senior EVP-IT (Last) (First) (Middle) 2001 THEURER BOULEVARD 3. Date of Earliest Transaction (Month/Day/Year) 08/08/2025 (Street) WINONA, MN 55987 4. If Amendment, Date Original Filed (Month/Day/Year) 08/08/2025 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 08/08/2025 M 34,612 A $13(1) 34,612 D Common Stock 08/08/2025 S 34,612 D $48.0302 0 D Common Stock 28,638(2) I Held in 401(K) Plan Common Stock 1,840(3) I Held in custodian account for Son

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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

Employee Stock Option (Right to Buy)

$13(1)

08/08/2025

M

34,612

(4)

12/31/2028

Common Stock

34,612(1)

$ 0

0

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Soderberg John Lewis 2001 THEURER BOULEVARD WINONA, MN 55987			Senior EVP-IT

Signatures

/s/ John J. Milek, Attorney-in-Fact		01/27/2026
**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)	The option was previously reported in a filing dated 1/3/2019 as covering 8,653 securities at a strike price of $52 and the amounts are adjusted to reflect two 2-for-1 stock splits on 5/22/2019 and 5/21/2025 respectively.
(2)	Shares attributed to reporting person's account within issuer's 401(K) Plan and includes additional stock split adjusted securities since the reporting person's prior report on 5/16/2025.
(3)	These shareholding amounts were inadvertently omitted from the reports filed on 8/16/2025 and 5/16/2025 and the amounts reported reflect a 2-for-1 stock split as of May 21, 2025.
(4)	The option will vest and become exercisable over a period of five years, with 40% the option vesting and becoming exercisable two years following the date of grant, and the remainder vesting and becoming exercisable proportionately on each anniversary of the grant date.

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