DCI director buys 409 shares at $82.61 — insider purchase

Director purchase increases stake in Donaldson Co. (DCI).

Rhea-AI Filing Summary

Director purchase increases stake in Donaldson Co. (DCI). A Form 4 shows director Christopher M. Hilger purchased 409 shares of common stock on 10/03/2025 at a price of $82.61 per share, bringing his beneficial ownership to 14,032 shares. The filing was signed by an attorney-in-fact on 10/06/2025. This is a routine Section 16 disclosure reporting an open-market or other permitted acquisition by an insider and does not include derivatives or option activity.

Positive

• Director purchase: 409 shares acquired, showing insider buying activity
• Price disclosed: purchase at $82.61 per share provides clear transaction detail
• Increased ownership: beneficial holdings rose to 14,032 shares

Negative

• None.

Insights

Corporate Governance Analyst

Insider buy by a director modestly increases alignment with shareholders.

The director acquired 409 shares at $82.61, raising his total to 14,032 shares. Insider purchases by directors can signal confidence in the issuer's prospects because they increase the director's personal stake.

Risks and dependencies include the size of the purchase relative to overall holdings and potential pre-existing trading plans, neither of which are disclosed here. Monitor subsequent filings for additional buys or sales within 30 days to see whether this reflects a larger pattern.

Insider Trade Summary

Grant/Award: 409 shares

Grant/Award 1 txn

Insider Hilger Christopher M.

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	409	$82.61	$34K

Holdings After Transaction: Common Stock — 14,032 shares (Direct)

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did the DCI Form 4 filed for Christopher M. Hilger report?

It reported the purchase of 409 shares of Donaldson Co. at $82.61 per share on 10/03/2025, increasing his holdings to 14,032 shares.

Does the Form 4 show any option or derivative transactions for DCI?

No. Table II for derivative securities shows no entries; the filing discloses only a non-derivative common stock purchase.

Who signed the Form 4 for Christopher M. Hilger?

The filing was signed by Amy C. Becker, Attorney-in-Fact on 10/06/2025.

Was the transaction reported as direct or indirect ownership?

The filing lists the post-transaction ownership as direct (D) for the 14,032 shares.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 4 Insider Transactions: What Each Field Means →

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Accepted by SEC EDGAR 10/06/2025 - 02:55 PM Learn about SEC filing dates

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^*

Hilger Christopher M.

(Last) (First) (Middle)

PO BOX 1299

(Street)

MINNEAPOLIS MN 55440

(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		409	A	$82.61	14,032	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 Christopher M. Hilger	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.