[Form 4] DONALDSON Co INC Insider Trading Activity

Rhea-AI Filing Summary

Director purchase of common stock recorded. A director reported acquiring $82.61 per share on 10/03/2025, buying 272 shares and increasing total beneficial ownership to 6,473 shares. The transaction was coded as an open-market acquisition and was reported on a Form 4 signed by an attorney-in-fact on 10/06/2025. No derivative transactions or additional remarks were disclosed.

Positive

• Timely disclosure of the director purchase with required filing information
• Clear transaction details: number of shares (272), price ($82.61), and post-transaction ownership (6,473 shares)

Negative

• None.

Insights

Insider Trading Compliance Specialist

Routine, clearly reported director purchase consistent with Section 16 filing rules.

The filing documents a straightforward open-market acquisition of common stock by a director: 272 shares at $82.61 on 10/03/2025

Key dependencies include timely reporting and proper use of filing codes; the form shows an attorney-in-fact signature and the standard transaction code, with no indication of plan-based or derivative activity. Monitor future Forms 4 for follow-up purchases or sales within the next quarter.

SEC Form 4

FORM 4

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
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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 for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Smiley Jacinth C

(Last) (First) (Middle)

1400 WEST 94TH STREET

(Street)

BLOOMINGTON MN 55431

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
DONALDSON Co INC [ DCI ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
10/03/2025

4. If Amendment, Date of 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

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	10/03/2025		A		272	A	$82.61	6,473	D

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 Securities Underlying Derivative Security (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: 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

Explanation of Responses:

Remarks:

	Amy C. Becker, Attorney-in-Fact for Jacinth C. Smiley	10/06/2025
	** Signature of Reporting Person	Date
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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did the Donaldson (DCI) Form 4 report on 10/03/2025?

A director acquired 272 shares of common stock at $82.61, bringing beneficial ownership to 6,473 shares.

Who reported the transaction for DCI and how was it signed?

The reporting person is a director, Jacinth C. Smiley, and the Form 4 was signed by Amy C. Becker as attorney-in-fact on 10/06/2025.

Does the Form 4 show any derivative or plan-based transactions for DCI?

No. Table II (derivative securities) is empty and the transaction is coded as an open-market acquisition (code A).

How many shares does the director own after the reported purchase?

The director beneficially owns 6,473 shares following the transaction.

What price was paid per share in the DCI insider purchase?

The reported purchase price per share was $82.61.