[Form 4] Atmus Filtration Technologies Inc. Insider Trading Activity

Rhea-AI Filing Summary

Atmus Filtration Technologies Inc. (ATMU) director Form 4 reports several small common stock trades and a later error correction. On 04/02/2025, the reporting person sold 40 shares at $37.79. They then bought 25 shares at $45 on 08/13/2025 and 15 shares at $45.81 on 09/05/2025. On 11/13/2025, 20 shares were sold at $48.84, but this sale is described as having been effected by mistake.

The filing explains that on 11/18/2025 these 20 shares were rescinded through the broker's error account and are deemed to have never occurred, reflected as a J code entry at $0. After the reported transactions, the director beneficially owned 9,078 shares of common stock directly. The filing notes it is being submitted late and states that all profits from the reported transactions will be disgorged to the issuer pursuant to applicable requirements.

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

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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 TN 37214

(City) (State) (Zip)

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)

3. Date of Earliest Transaction (Month/Day/Year)
04/02/2025

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	04/02/2025		S		40	D	$37.79	9,038	D
Common Stock	08/13/2025		P		25	A	$45	9,063	D
Common Stock	09/05/2025		P		15	A	$45.81	9,078	D
Common Stock	11/13/2025		S(1)		20	D	$48.84	9,058	D
Common Stock	11/18/2025		J(2)		20	A	$0(2)	9,078	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. On November 13, 2025, the sale of these shares by the reporting person was effected by mistake.

2. On November 18, 2025, the shares from November 13, 2025 were rescinded through the broker's error account and therefore are deemed to have never occurred.

Remarks:

This Form 4 is being filed late due to the fact that the reported transactions only recently came to the attention of the reporting person and the issuer. Neither the reporting person nor the issuer was aware of the transactions at the time they occurred. Upon discovery, the issuer promptly took steps to prepare and file this Form 4 reflecting the transactions. All profits from the reported transactions will be disgorged to the issuer pursuant to applicable requirements.

	/s/Tiffany B. Williams, Attorney-in-Fact for Diego Donoso	11/19/2025
	** 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.

FAQ

What insider transactions did ATMU director Diego Donoso report on this Form 4?

The Form 4 reports multiple transactions in Atmus Filtration Technologies Inc. (ATMU) common stock. On 04/02/2025, the director sold 40 shares at $37.79. On 08/13/2025, they purchased 25 shares at $45, and on 09/05/2025 they purchased 15 shares at $45.81. A sale of 20 shares at $48.84 on 11/13/2025 and a related correction on 11/18/2025 are also reported.

How many Atmus Filtration (ATMU) shares does the director own after these transactions?

Following the reported transactions and the correction of the mistaken sale, the director is shown as beneficially owning 9,078 shares of Atmus Filtration Technologies Inc. common stock, held directly.

What was the mistaken ATMU stock transaction mentioned in this Form 4?

The filing states that on 11/13/2025, a sale of 20 shares of Atmus Filtration Technologies Inc. common stock at $48.84 was effected by mistake. It further explains that on 11/18/2025 those 20 shares were rescinded through the broker's error account and are deemed to have never occurred, which is reflected as a J code transaction at $0.

Why was this ATMU Form 4 filed late?

The remarks section explains that this Form 4 is being filed late because the reported transactions only recently came to the attention of the reporting person and the issuer. It notes that neither the reporting person nor the issuer was aware of the transactions when they occurred and that, upon discovery, the issuer promptly took steps to prepare and file this report.

Does the ATMU director Form 4 mention disgorgement of profits?

Yes. The remarks state that all profits from the reported transactions will be disgorged to Atmus Filtration Technologies Inc. pursuant to applicable requirements. No specific dollar amount is provided in the excerpt.

What is the reporting person’s relationship to Atmus Filtration Technologies (ATMU)?

The reporting person is identified as a Director of Atmus Filtration Technologies Inc.. The Form 4 is indicated as being filed by one reporting person.