Donaldson grants Bart C. Driesen 12,800 stock options

The options vest in three equal annual installments beginning October 1, 2027, and expire October 1, 2036.

Rhea-AI Filing Summary

Donaldson Co. (DCI) President Bart C. Driesen was granted employee stock options covering 12,800 common shares on October 1, 2026, at an exercise price of $87.76 per share. The options vest in three equal annual installments beginning October 1, 2027, and expire October 1, 2036. Separately, his reported direct common-stock position was 11,916 shares.

Insider Trade Summary

Grant/Award: 12,800 shares

Grant/Award 2 txns

Insider Driesen Bart C.

Role President

Type	Security	Shares	Price	Value
Grant/Award	Employee Stock Option (right to buy) F1	12,800	$0.00	$0.00
holding	Common Stock	--	--	--

Holdings After Transaction: Employee Stock Option (right to buy) — 12,800 contracts (Direct); Common Stock — 11,916 shares (Direct)

Footnotes (1)

1. F1. The option vests in three equal annual installments beginning on October 1, 2027.

Key Figures

Employee stock options granted: 12,800 options covering 12,800 common shares Exercise price: $87.76 per share Direct common-stock position: 11,916 shares +2 more

5 metrics

Employee stock options granted 12,800 options covering 12,800 common shares Granted October 1, 2026

Exercise price $87.76 per share Price to buy common shares under the options

Direct common-stock position 11,916 shares Reported following the October 1, 2026 award

Vesting installments 3 equal annual installments Beginning October 1, 2027

Option expiration October 1, 2036 Expiration date of the options

Key Terms

Employee Stock Option (right to buy), exercise price, vests

3 terms

Employee Stock Option (right to buy) financial

"Employee Stock Option (right to buy)"

exercise price financial

"at an exercise price of $87.76 per share"

The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.

vests financial

"The option vests in three equal annual installments"

FAQ

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

How many stock options did Donaldson (DCI) President Bart C. Driesen receive?

Bart C. Driesen was granted 12,800 employee stock options covering common shares on October 1, 2026, at an exercise price of $87.76 per share.

When do Bart C. Driesen’s DCI options vest and expire?

The options vest in three equal annual installments beginning October 1, 2027, and expire October 1, 2036.

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

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Available on EDGAR 10/05/2026 - 11:38 AM Accepted by SEC EDGAR 10/05/2026 - 11:38 AM 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^*

Driesen Bart C.

(Last) (First) (Middle)

1400 WEST 94TH STREET

(Street)

BLOOMINGTON MINNESOTA 55431

(City) (State) (Zip)

UNITED STATES

(Country)

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

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
10/01/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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								11,916	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
Employee Stock Option (right to buy)	$87.76	10/01/2026		A		12,800		(1)	10/01/2036	Common Stock	12,800	$0	12,800	D

Explanation of Responses:

1. The option vests in three equal annual installments beginning on October 1, 2027.

Remarks:

	Amy C. Becker, Attorney-in-Fact for Bart Driesen	10/05/2026
	** 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.
* Form 4: SEC 1474 (03-26)