Director Elizabeth Mora sells 300 MKS INC (MKSI) shares under 10b5-1 plan

Rhea-AI Filing Summary

MKS INC director Elizabeth Mora reported an open-market sale of company stock. She sold 300 shares of common stock at a price of $239.44 per share. After this transaction, she continued to hold 18,663.394 shares of MKS INC common stock directly.

The sale was executed under a pre-arranged Rule 10b5-1 trading plan that she adopted on February 19, 2025, indicating the transaction was scheduled in advance rather than timed discretionarily.

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).

X

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^*

Mora Elizabeth

(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)

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

3. Date of Earliest Transaction (Month/Day/Year)
03/02/2026

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	03/02/2026		S(1)		300	D	$239.44	18,663.394	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. This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 19, 2025.

	/s/ M. Kathryn Rickards, attorney-in-fact	03/03/2026
	** 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 MKS INC (MKSI) report for Elizabeth Mora?

MKS INC director Elizabeth Mora reported selling 300 shares of common stock in an open-market transaction. The shares were sold at a price of $239.44 per share, as disclosed in the Form 4 insider trading report.

Is the Elizabeth Mora stock sale at MKS INC (MKSI) part of a 10b5-1 plan?

Yes. The filing states the transaction was executed under a Rule 10b5-1 trading plan adopted on February 19, 2025. Such plans allow insiders to schedule trades in advance to help manage compliance with insider trading rules.

How many MKS INC (MKSI) shares did Elizabeth Mora sell and at what price?

Elizabeth Mora sold 300 shares of MKS INC common stock. The Form 4 reports the sale price as $239.44 per share in an open-market or privately negotiated transaction, coded as a sale of non-derivative securities.

How many MKS INC (MKSI) shares does Elizabeth Mora hold after the reported sale?

After the sale, Elizabeth Mora directly holds 18,663.394 shares of MKS INC common stock. This post-transaction holding amount is disclosed in the Form 4 as the total shares beneficially owned following the reported transaction.

What role does Elizabeth Mora hold at MKS INC (MKSI) in this Form 4 filing?

In the Form 4, Elizabeth Mora is identified as a director of MKS INC. She is not listed as an officer or 10% owner, and the reported transaction reflects her activity as a board member holding common stock directly.

What type of transaction code appears in Elizabeth Mora’s MKS INC (MKSI) Form 4?

The transaction is coded "S" for a sale in open-market or private transactions. It involves non-derivative common stock, indicating a straightforward sale of existing shares rather than an exercise, conversion, or derivative-related transaction.