MKS Inc (MKSI) EVP & COO Schreiner sells 4,100 shares

Rhea-AI Filing Summary

MKS Inc executive James Alan Schreiner, EVP & COO, reported an open-market sale of 4,100 shares of common stock at $255.00 per share on February 24, 2026. After this transaction, he directly owns 23,401.962 shares of MKS Inc common stock.

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^*

Schreiner James Alan

(Last) (First) (Middle)

C/O MKS INC.

2 TECH DRIVE

(Street)

ANDOVER MA 01810

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
MKS INC [ MKSI ]

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

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

3. Date of Earliest Transaction (Month/Day/Year)
02/24/2026

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	02/24/2026		S		4,100	D	$255	23,401.962	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:

	/s/ M. Kathryn Rickards, attorney-in-fact	02/25/2026
	** 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.

FAQ

What insider transaction did MKSI executive James Alan Schreiner report?

James Alan Schreiner, EVP & COO of MKS Inc, reported an open-market sale of 4,100 shares of common stock. The transaction was filed on Form 4 and classified as a sale in the open market or private transaction.

At what price did James Alan Schreiner sell MKSI common stock?

James Alan Schreiner sold 4,100 shares of MKS Inc common stock at an average price of $255.00 per share. This price reflects the per-share consideration reported for the open-market sale transaction on the Form 4 filing.

How many MKSI shares does James Alan Schreiner own after this Form 4 transaction?

Following the reported sale, James Alan Schreiner directly owns 23,401.962 shares of MKS Inc common stock. The Form 4 specifies this figure as the total shares beneficially owned following the reported transaction under direct ownership.

What role does James Alan Schreiner hold at MKS Inc in this Form 4 filing?

In this Form 4, James Alan Schreiner is identified as EVP & COO of MKS Inc. The filing indicates he is an officer but not a director or ten percent owner, and the reported shares are held under direct ownership.

Was the MKSI insider trade by James Alan Schreiner a buy or a sell?

The transaction reported by James Alan Schreiner was a sale of MKS Inc common stock. The Form 4 uses transaction code “S” and describes the action as an open-market or private sale transaction, not a purchase or option exercise.