Atmus (ATMU) director adds stock with open-market buys and RSU grant

Rhea-AI Filing Summary

Atmus Filtration Technologies director Gretchen R. Haggerty increased her stake in the company’s common stock. On May 12, 2026, she received 2,619 Restricted Share Units as part of the 2026-2027 Annual Director Compensation, which vest on May 12, 2027 or at the next Annual Meeting of Stockholders, whichever occurs first. She also bought a total of 1,973.351 shares in open-market transactions at prices around $55.71–$55.74 per share, signaling additional personal investment alongside her equity compensation.

Insider Trade Summary

Net Buyer: 1,973.351 shares ($109,999)

Net Buy 4 txns

Insider HAGGERTY GRETCHEN R

Role null

Bought 1,973.351 shs ($110K)

Type	Security	Shares	Price	Value
Purchase	Common Stock	100.351	$55.71	$6K
Purchase	Common Stock	1	$55.74	$55.74
Purchase	Common Stock	1,872	$55.744	$104K
Grant/Award	Common Stock	2,619	$0.00	--

Holdings After Transaction: Common Stock — 23,868.154 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

RSU grant: 2,619 units RSU vesting date: May 12, 2027 Open-market purchases: 1,973.351 shares +4 more

7 metrics

RSU grant 2,619 units Restricted Share Units granted May 12, 2026 as 2026-2027 Annual Director Compensation

RSU vesting date May 12, 2027 RSUs fully vest on May 12, 2027 or next Annual Meeting, whichever comes first

Open-market purchases 1,973.351 shares Total common shares bought in open market on May 12, 2026

Purchase price 1 $55.744 per share Price for 1,872 purchased common shares

Purchase price 2 $55.740 per share Price for 1 purchased common share

Purchase price 3 $55.710 per share Price for 100.351 purchased common shares

Net share change from buys 1,973.351 shares Net buy-sell share change from non-derivative transactions in this filing

Key Terms

Restricted Share Units ("RSUs"), Annual Director Compensation, open-market purchase, 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

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

open-market purchase financial

"transaction_action: "open-market purchase" with transaction_code_description "Purchase in open market or private transaction""

An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.

Form 4 regulatory

"INSIDER FILING DATA (Form 4): { "issuerName": "Atmus Filtration Technologies Inc.""

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^*

HAGGERTY GRETCHEN R

(Last) (First) (Middle)

5757 N GREEN BAY AVE

(Street)

GLENDALE WISCONSIN 53209

(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	05/12/2026		P		100.351	A	$55.71	23,868.154	D
Common Stock	05/12/2026		P		1	A	$55.74	23,869.154	D
Common Stock	05/12/2026		P		1,872	A	$55.744	25,741.154	D
Common Stock(1)	05/12/2026		A		2,619	A	$0	28,360.154	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 Gretchen Haggerty	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 transactions did Atmus (ATMU) director Gretchen Haggerty report?

Director Gretchen R. Haggerty reported receiving 2,619 Restricted Share Units and buying 1,973.351 Atmus common shares in open-market transactions. The RSUs were granted as part of 2026-2027 Annual Director Compensation and vest in 2027 or at the next Annual Meeting.

How many Atmus (ATMU) shares did Gretchen Haggerty buy and at what prices?

Gretchen Haggerty bought 1,973.351 Atmus common shares in several open-market trades. Reported purchase prices were about $55.71, $55.74, and $55.744 per share, indicating direct personal investment at those market levels on May 12, 2026.

What are the terms of Gretchen Haggerty’s RSU grant from Atmus (ATMU)?

Haggerty received 2,619 Restricted Share Units from Atmus on May 12, 2026 as part of 2026-2027 Annual Director Compensation. According to the disclosure, these RSUs fully vest on May 12, 2027, or at the next Annual Meeting of Stockholders, whichever comes first.

Is Gretchen Haggerty’s Atmus (ATMU) stock ownership direct or through another entity?

The filing shows Gretchen Haggerty’s Atmus holdings as direct ownership. Transactions are coded as direct, and there are no footnotes indicating that shares are held by a separate trust, LLC, or other entity with different voting or investment authority.

Does the Atmus (ATMU) filing indicate any stock option exercises by Gretchen Haggerty?

The disclosure does not report any option exercises. It shows an RSU grant of 2,619 units and open-market purchases totaling 1,973.351 shares, with no derivative transactions or exercises listed in the derivative transaction summary for this filing.