Atmus (NYSE: ATMU) SVP sells 2,890 shares to cover tax bill

Rhea-AI Filing Summary

Atmus Filtration Technologies Senior Vice President Charles Masters sold 2,890 shares of common stock in an open-market transaction. The shares were sold on June 1, 2026 at an average price of $45.247 per share. A footnote explains the sale reflects shares sold upon vesting of the first half of a launch grant award to pay his tax withholding obligation, indicating this was a compensation-related, mechanistic transaction. After the sale, he continues to hold 43,579 shares of Atmus stock directly, so the sale represents a relatively small portion of his overall reported holdings.

Insider Trade Summary

Net Seller: 2,890 shares ($130,764)

Net Sell 1 txn

Insider Masters Charles

Role Senior Vice President

Sold 2,890 shs ($131K)

Type	Security	Shares	Price	Value
Sale	Common Stock	2,890	$45.247	$131K

Holdings After Transaction: Common Stock — 43,579 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Shares sold: 2,890 shares Sale price: $45.247 per share Shares held after transaction: 43,579 shares

3 metrics

Shares sold 2,890 shares Open-market sale on June 1, 2026

Sale price $45.247 per share Average price for the 2,890 shares sold

Shares held after transaction 43,579 shares Direct ownership following the June 1, 2026 sale

Key Terms

open-market sale, tax withholding obligation, launch grant award

3 terms

open-market sale financial

"transaction_action: "open-market sale" for the common stock transaction"

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

tax withholding obligation financial

"shares sold upon vesting ... to pay reporting person's tax withholding obligation"

launch grant award financial

"vesting of first half of launch grant award to pay tax withholding"

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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^*

Masters Charles

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/01/2026

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	06/01/2026		S		2,890(1)	D	$45.247	43,579	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 shares sold upon vesting of first half of launch grant award to pay reporting person's tax withholding obligation.

Remarks:

	/s/Tiffany B. Williams, Attorney-in-Fact for Charles Masters	06/02/2026
	** 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 (ATMU) report for Charles Masters?

Atmus disclosed that Senior Vice President Charles Masters sold 2,890 shares of common stock. The transaction occurred on June 1, 2026, as an open-market sale at an average price of $45.247 per share, according to the Form 4 filing and accompanying footnote.

Why did Atmus executive Charles Masters sell 2,890 ATMU shares?

The sale was made to cover tax obligations. A footnote states the 2,890 shares were sold upon vesting of the first half of a launch grant award to pay the reporting person’s tax withholding obligation, indicating the transaction was tied to compensation rather than discretionary selling.

How many Atmus (ATMU) shares does Charles Masters hold after this Form 4 sale?

After the reported transaction, Charles Masters holds 43,579 Atmus common shares directly. This means the 2,890 shares sold on June 1, 2026 represent only a small fraction of his total reported holdings, suggesting the filing reflects a routine tax-related adjustment.

What price did Charles Masters receive for the Atmus (ATMU) shares sold?

The reported sale price was $45.247 per share. All 2,890 Atmus common shares were sold on June 1, 2026 at this average price in an open-market transaction, according to the Form 4 transaction details for the Senior Vice President.

Was the Atmus (ATMU) insider sale by Charles Masters part of a compensation event?

Yes. The filing’s footnote explains the shares were sold upon vesting of the first half of a launch grant award. The proceeds were used to pay the executive’s tax withholding obligation tied to that equity award, indicating a compensation-driven, tax-related sale.