Donaldson (NYSE: DCI) former officer lines up seven-figure share sale

Rhea-AI Filing Summary

DONALDSON Co INC (DCI) received a notice of proposed sale of restricted or control securities under Rule 144 by former officer Douglas Allan Milroy. The filing covers the intended sale of 13,400 shares of common stock, with an aggregate market value of $1,230,436.24, through Morgan Stanley Smith Barney LLC. The shares are to be sold on or about 08/27/2026 on the NYSE and were acquired via exercise of options under a registered plan. The issuer reports 115,911,056 shares outstanding, which is a baseline figure, not the amount being sold.

Key Figures

Shares to be sold: 13,400 shares of common stock Aggregate market value: $1,230,436.24 Shares outstanding: 115,911,056 shares +2 more

5 metrics

Shares to be sold 13,400 shares of common stock Number of Donaldson Co Inc shares covered by the Rule 144 notice

Aggregate market value $1,230,436.24 Aggregate market value of the 13,400 shares to be sold

Shares outstanding 115,911,056 shares Donaldson Co Inc common shares outstanding as stated in the notice

Approximate sale date 08/27/2026 Approximate date of sale for the proposed Rule 144 transaction

Shares acquired 13,400 shares Shares acquired via exercise of options under a registered plan on 08/27/2026

Key Terms

Rule 144, Form 144, Exercise of Options Under a Registered Plan, aggregate market value

4 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Form 144 regulatory

"144: Filer Information 144: Issuer Information"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

Exercise of Options Under a Registered Plan financial

"Common | 08/27/2026 | Exercise of Options Under a Registered Plan"

aggregate market value financial

"| 13400 | 1230436.24 | 115911056 | 08/27/2026 |"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

FAQ

What does the Form 144 filing for DCI disclose about planned share sales?

The filing discloses that former officer Douglas Allan Milroy plans to sell 13,400 shares of Donaldson Co Inc common stock under Rule 144, with an aggregate market value of $1,230,436.24, on or about 08/27/2026 through Morgan Stanley Smith Barney LLC.

Who is selling Donaldson (DCI) shares in this Form 144 notice?

The notice relates to sales for the account of Douglas Allan Milroy, identified as a former officer of Donaldson Co Inc. The filing is a Rule 144 notice of proposed sale of restricted or control securities.

How many Donaldson (DCI) shares are covered by this Rule 144 notice and what is their value?

The notice covers 13,400 common shares of Donaldson Co Inc, with an aggregate market value of $1,230,436.24 as stated in the securities information section of the filing.

When are the Donaldson (DCI) shares expected to be sold under this Form 144?

The shares are expected to be sold on or about 08/27/2026. The filing lists this as the approximate date of sale for the 13,400 shares of common stock to be sold on the NYSE.

How were the Donaldson (DCI) shares to be sold acquired by the filer?

The 13,400 shares covered by the notice were acquired on 08/27/2026 through an exercise of options under a registered plan from the issuer, with the form of payment indicated as cash.

How many Donaldson (DCI) shares are outstanding according to this Form 144?

The filing states that 115,911,056 shares of Donaldson Co Inc common stock are outstanding. This is provided as context in the securities information section and is not the amount proposed to be sold.

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

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Available on EDGAR 08/27/2026 - 04:14 PM Accepted by SEC EDGAR 08/27/2026 - 04:14 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001381551
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	DONALDSON COMPANY, INC.
SEC File Number	001-07891
Address of Issuer	1400 West 94th Street Minneapolis MINNESOTA 55431
Phone	952-887-3131
Name of Person for Whose Account the Securities are To Be Sold	DOUGLAS ALLAN MILROY
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Former Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	13400	1230436.24	115911056	08/27/2026	NYSE

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	08/27/2026	Exercise of Options Under a Registered Plan	Issuer			13400	08/27/2026	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Nothing to Report

144: Remarks and Signature

Remarks
Date of Notice	08/27/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Douglas Milroy
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)