Atmus (ATMU) director Diego Donoso granted 2,619 RSUs as board pay

Rhea-AI Filing Summary

Donoso Diego reported acquisition or exercise transactions in this Form 4 filing.

Atmus Filtration Technologies Inc. director Diego Donoso received an equity grant in the form of restricted share units. On May 12, 2026, he was awarded 2,619 shares of common stock at no purchase price as part of the 2026-2027 annual director compensation program.

These restricted share units will fully vest on May 12, 2027, or on the date of the next annual meeting of stockholders, whichever occurs first. Following this grant, Donoso directly holds 11,697 shares of Atmus Filtration Technologies common stock.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Donoso Diego

Role null

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	2,619	$0.00	--

Holdings After Transaction: Common Stock — 11,697 shares (Direct, null)

Footnotes (1)

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Key Figures

RSUs granted: 2,619 shares Shares after transaction: 11,697 shares Grant price per share: $0.00 per share +1 more

4 metrics

RSUs granted 2,619 shares Restricted Share Units granted May 12, 2026

Shares after transaction 11,697 shares Total direct holdings following the grant

Grant price per share $0.00 per share Equity award issued at no purchase price

Vesting date May 12, 2027 RSUs fully vest on this date or next annual meeting

Key Terms

Restricted Share Units ("RSUs"), Annual Director Compensation, vest, Form 4

4 terms

Restricted Share Units ("RSUs") financial

"Reflects Restricted Share Units ("RSUs") granted on May 12, 2026, as part of the 2026-2027 Annual Director Compensation."

Annual Director Compensation financial

"granted on May 12, 2026, as part of the 2026-2027 Annual Director Compensation."

vest financial

"The RSUs fully vest on May 12, 2027, or the next Annual Meeting of Stockholders, whichever comes first."

A vest is the process by which an employee earns the right to receive certain benefits or ownership interests, such as stock or retirement funds, over time. It’s similar to earning a reward gradually, ensuring that the benefit becomes fully yours only after a set period or meeting specific conditions. This makes it important for investors because it determines when they can actually claim or use those benefits.

Form 4 regulatory

"INSIDER FILING DATA (Form 4):"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

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^*

Donoso Diego

(Last) (First) (Middle)

26 CENTURY BOULEVARD

(Street)

NASHVILLE TENNESSEE 37214

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Atmus Filtration Technologies Inc. [ ATMU ]

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/12/2026

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(1)	05/12/2026		A		2,619	A	$0	11,697	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:

1. Reflects Restricted Share Units ("RSUs") granted on May 12, 2026, as part of the 2026-2027 Annual Director Compensation. The RSUs fully vest on May 12, 2027, or the next Annual Meeting of Stockholders, whichever comes first.

Remarks:

	/s/Tiffany B. Williams, Attorney-in-Fact for Diego Donoso	05/13/2026
	** 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 transaction did Atmus Filtration Technologies (ATMU) disclose for Diego Donoso?

Atmus Filtration Technologies reported that director Diego Donoso received a grant of 2,619 restricted share units of common stock. The grant is part of the company’s 2026-2027 annual director compensation, increasing his direct holdings to 11,697 shares after the award.

How many shares did Diego Donoso receive in the latest Atmus (ATMU) Form 4 filing?

Diego Donoso received 2,619 shares in the form of restricted share units of Atmus common stock. These units were granted at no purchase price and are tied to his 2026-2027 annual director compensation arrangement with the company.

When do Diego Donoso’s newly granted Atmus (ATMU) RSUs vest?

Diego Donoso’s restricted share units fully vest on May 12, 2027, or on the date of the next annual meeting of stockholders, whichever comes first. Vesting means the award becomes fully earned and generally convertible into common shares.

What is Diego Donoso’s total Atmus (ATMU) shareholding after this grant?

After the award, Diego Donoso directly holds 11,697 shares of Atmus common stock. This total includes the 2,619 restricted share units granted on May 12, 2026, as part of the company’s 2026-2027 annual director compensation program.

Was Diego Donoso’s Atmus (ATMU) equity award an open-market purchase?

No, the Form 4 shows the transaction as a grant or award acquisition, coded “A.” The 2,619 restricted share units were issued as compensation at zero dollar price per share, not purchased in the open market by Diego Donoso.