MKS INC director sells 340 shares in open market

MKS INC director Jacqueline F. Moloney reported an open-market sale of 340.107 shares of common stock on March 12, 2026 at a weighted average price of $213.7717 per share.

Rhea-AI Filing Summary

MKS INC director Jacqueline F. Moloney reported an open-market sale of 340.107 shares of common stock on March 12, 2026 at a weighted average price of $213.7717 per share. The trades were executed in multiple transactions between $213.7716 and $214.015 per share.

After this sale, Moloney directly owns 10,393.197 shares of MKS INC common stock. The filing notes that detailed trade-by-trade pricing and share data are available upon request.

Insider Trade Summary

Net Seller: 340.107 shares

Net Sell 1 txn

Insider Moloney Jacqueline F

Role Director

Sold 340.107 shs ($73K)

Type	Security	Shares	Price	Value
Sale	Common Stock	340.107	$213.7717	$73K

Holdings After Transaction: Common Stock — 10,393.197 shares (Direct)

Footnotes (1)

1. F1. This transaction was executed in multiple trades at prices ranging from $213.7716 to $214.015. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, the full information regarding the number of shares and prices at which the transaction was effected.

FAQ

What insider transaction did MKS INC (MKSI) disclose for Jacqueline F. Moloney?

MKS INC disclosed that director Jacqueline F. Moloney sold 340.107 shares of common stock in an open-market transaction. The weighted average sale price was $213.7717 per share, with trades executed between $213.7716 and $214.015 per share.

How many MKS INC (MKSI) shares does Jacqueline F. Moloney hold after the reported sale?

Following the reported transaction, Jacqueline F. Moloney directly owns 10,393.197 shares of MKS INC common stock. This post-transaction figure comes directly from the Form 4 and reflects her remaining direct holdings after the 340.107-share open-market sale.

On what date did Jacqueline F. Moloney’s MKS INC (MKSI) share sale occur and at what price?

The sale occurred on March 12, 2026, with a weighted average price of $213.7717 per share. Individual trades were executed in a price range from $213.7716 to $214.015, according to the Form 4 footnote disclosure.

Was Jacqueline F. Moloney’s MKS INC (MKSI) transaction an open-market sale?

Yes. The Form 4 classifies the transaction as an open-market sale of common stock, coded “S.” It involved 340.107 shares sold directly by Moloney, with pricing reported on a weighted-average basis across multiple individual trade executions.

Does the MKS INC (MKSI) Form 4 provide detailed trade data for Moloney’s sale?

The Form 4 states that the transaction was executed in multiple trades within a narrow price range. It notes Moloney will provide full information on the number of shares and prices for each trade upon request to interested parties.

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Accepted by SEC EDGAR 03/13/2026 - 10:19 AM Learn about SEC filing dates

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^*

Moloney Jacqueline F

(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)
03/12/2026

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	03/12/2026		S		340.107	D	$213.7717(1)	10,393.197	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 executed in multiple trades at prices ranging from $213.7716 to $214.015. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide, upon request, the full information regarding the number of shares and prices at which the transaction was effected.

	/s/ M. Kathryn Rickards, attorney-in-fact	03/13/2026
	** 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.