Donaldson (DCI) director buys 339 shares at $82.61; holds 25,960

Insider purchase recorded: A Form 4 shows director Trudy A. Rautio bought 339 shares of Donaldson Co. (DCI) on 10/03/2025 at $82.61 per share.

Rhea-AI Filing Summary

Insider purchase recorded: A Form 4 shows director Trudy A. Rautio bought 339 shares of Donaldson Co. (DCI) on 10/03/2025 at $82.61 per share. After the purchase she directly owns 25,960 shares, indicating continued equity alignment with shareholders. The filing was signed by an attorney-in-fact on 10/06/2025.

Positive

• Director purchase of 339 shares on 10/03/2025 at $82.61, showing personal investment
• Post-transaction direct ownership of 25,960 shares, indicating continued equity alignment

Negative

• None.

Insights

Corporate Governance Analyst

Director purchase signals personal investment in the company.

Insider purchases by directors are commonly interpreted as alignment of interests with shareholders because the director increased her direct stake by 339 shares at $82.61. The transaction is reported under Section 16 and recorded on a Form 4, meeting disclosure requirements.

Reliability depends on size relative to total holdings and broader insider activity; this single small purchase does not on its own indicate a change in corporate strategy. Monitor additional filings or patterns of purchases over the next 3–12 months for a clearer signal.

Insider Trade Summary

Grant/Award: 339 shares

Grant/Award 1 txn

Insider Rautio Trudy A.

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	339	$82.61	$28K

Holdings After Transaction: Common Stock — 25,960 shares (Direct)

FAQ

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

What did Donaldson (DCI) insider Trudy A. Rautio do on 10/03/2025?

She purchased 339 shares of Donaldson common stock at $82.61 per share on 10/03/2025.

How many Donaldson (DCI) shares does Trudy A. Rautio own after the transaction?

She directly owns 25,960 shares following the reported purchase.

When was the Form 4 for this transaction signed and filed?

The filing was signed by an attorney-in-fact on 10/06/2025 and reports the 10/03/2025 transaction date.

Was this Form 4 filed as an individual or joint filing for DCI?

The form indicates it was filed by one reporting person (individual filing).

Does the Form 4 disclose any derivative transactions for Trudy A. Rautio?

No. Table II for derivative securities contains no entries; only a non-derivative purchase is reported.

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 - 02:57 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^*

Rautio Trudy A.

(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		339	A	$82.61	25,960	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 Trudy Rautio	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.