Donaldson (NYSE: DCI) president sells 20,600 shares after option exercise

Rhea-AI Filing Summary

Donaldson Co. president Guillermo Briseño reported an exercise-and-sell transaction involving 20,600 shares of common stock. On March 26, 2026, he exercised fully vested employee stock options for 12,000 shares at $42.72 per share and 8,600 shares at $45.43 per share.

He then sold 12,000 and 8,600 common shares, respectively, at $84.97 per share in open-market transactions. Following these trades, Briseño directly holds 29,267 shares of Donaldson common stock, indicating he retained a meaningful equity stake after converting options and realizing gains on part of his position.

Insider Trade Summary

Net Seller: 20,600 shares ($1,750,382)

Net Sell 6 txns

Insider Briseno Guillermo

Role President

Sold 20,600 shs ($1.75M)

Type	Security	Shares	Price	Value
Exercise	Employee Stock Option (right to buy)	12,000	$0.00	--
Exercise	Employee Stock Option (right to buy)	8,600	$0.00	--
Exercise	Common Stock	12,000	$42.72	$513K
Sale	Common Stock	12,000	$84.97	$1.02M
Exercise	Common Stock	8,600	$45.43	$391K
Sale	Common Stock	8,600	$84.97	$731K

Holdings After Transaction: Employee Stock Option (right to buy) — 0 shares (Direct); Common Stock — 41,267 shares (Direct)

Footnotes (1)

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Form 4 Insider Transactions: What Each Field Means →

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^*

Briseno Guillermo

(Last) (First) (Middle)

PO BOX 1299

(Street)

MINNEAPOLIS MINNESOTA 55440

(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)
03/26/2026

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	03/26/2026		M		12,000	A	$42.72	41,267	D
Common Stock	03/26/2026		S		12,000	D	$84.97	29,267	D
Common Stock	03/26/2026		M		8,600	A	$45.43	37,867	D
Common Stock	03/26/2026		S		8,600	D	$84.97	29,267	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)	$42.72	03/26/2026		M			12,000	(1)	12/16/2026	Common Stock	12,000	$0	0	D
Employee Stock Option (right to buy)	$45.43	03/26/2026		M			8,600	(1)	09/22/2027	Common Stock	8,600	$0	8,600	D

Explanation of Responses:

1. Fully vested

Remarks:

	Amy C. Becker, Attorney-in-Fact for Guillermo Briseno	03/27/2026
	** 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)

FAQ

What insider transactions did Donaldson (DCI) president Guillermo Briseño report?

Guillermo Briseño exercised options for 20,600 Donaldson shares and sold the same number. He converted employee stock options into common stock, then executed open-market sales on March 26, 2026, while retaining a remaining direct holding of 29,267 common shares afterward.

How many Donaldson (DCI) shares did Guillermo Briseño sell and at what price?

Guillermo Briseño sold 20,600 Donaldson common shares in total. He sold 12,000 shares and 8,600 shares at an open-market price of $84.97 per share, according to the Form 4, immediately after exercising fully vested employee stock options.

What stock options did Guillermo Briseño exercise in this Donaldson (DCI) Form 4?

He exercised fully vested employee stock options covering 20,600 Donaldson shares. The options related to 12,000 shares at a $42.72 exercise price and 8,600 shares at a $45.43 exercise price, converting these derivative awards into common stock before selling the acquired shares.

How many Donaldson (DCI) shares does Guillermo Briseño own after these transactions?

After the reported transactions, Guillermo Briseño directly owns 29,267 Donaldson common shares. This post-transaction balance reflects his remaining equity stake following the exercise of 20,600 stock options and the subsequent sale of the same number of common shares on March 26, 2026.

Were the Donaldson (DCI) options exercised by Guillermo Briseño fully vested?

Yes. A footnote indicates the employee stock options involved were fully vested. Briseño exercised options with strike prices of $42.72 and $45.43 per share, converting them into 20,600 Donaldson common shares before carrying out open-market sales of those shares.