MKS INC (MKSI) director Moloney sells 1,000 shares in open-market trade

Rhea-AI Filing Summary

MKS INC director Jacqueline F. Moloney reported an open-market sale of 1,000 shares of Common Stock. The shares were sold at an average price of $312.1969 per share. After this transaction, she directly holds 8,775.156 MKS INC shares, indicating she retains a substantial ongoing equity position.

Insider Trade Summary

Net Seller: 1,000 shares ($312,197)

Net Sell 1 txn

Insider Moloney Jacqueline F

Role null

Sold 1,000 shs ($312K)

Type	Security	Shares	Price	Value
Sale	Common Stock	1,000	$312.1969	$312K

Holdings After Transaction: Common Stock — 8,775.156 shares (Direct, null)

Footnotes (1)

Key Figures

Shares sold: 1,000 shares Sale price: $312.1969 per share Shares held after: 8,775.156 shares +1 more

4 metrics

Shares sold 1,000 shares Open-market sale of Common Stock

Sale price $312.1969 per share Average price for the 1,000-share sale

Shares held after 8,775.156 shares Direct ownership following the transaction

Net shares sold 1,000 shares Net-sell direction in transaction summary

Key Terms

open-market sale, Common Stock, Form 4, transaction code "S"

4 terms

open-market sale financial

"transaction_action": "open-market sale""

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.

Common Stock financial

""security_title": "Common Stock""

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

Form 4 regulatory

"INSIDER FILING DATA (Form 4)"

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.

transaction code "S" regulatory

""transaction_code": "S""

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^*

Moloney Jacqueline F

(Last) (First) (Middle)

C/O MKS INC.

2 TECH DRIVE

(Street)

ANDOVER MASSACHUSETTS 01810

(City) (State) (Zip)

UNITED STATES

(Country)

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)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/14/2026

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	05/14/2026		S		1,000	D	$312.1969	8,775.156	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	05/15/2026
	** 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 MKS INC (MKSI) report for Jacqueline F. Moloney?

MKS INC reported that director Jacqueline F. Moloney sold 1,000 shares of Common Stock in an open-market transaction. The sale was disclosed on Form 4 as a routine insider trading report for regulatory transparency.

At what price did Jacqueline F. Moloney sell MKS INC (MKSI) shares?

Jacqueline F. Moloney sold 1,000 MKS INC Common Stock shares at an average price of $312.1969 per share. This price reflects the transaction value reported for her open-market sale on the Form 4 filing.

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

After selling 1,000 shares, Jacqueline F. Moloney directly holds 8,775.156 MKS INC Common Stock shares. This remaining position shows she continues to maintain a notable equity stake in the company following the reported transaction.

Was the MKS INC (MKSI) insider transaction an open-market sale?

Yes, the transaction is classified as an open-market sale of Common Stock. The Form 4 identifies the transaction code as “S,” which represents a sale in the open market or a private transaction under SEC rules.

Does the Form 4 for MKS INC (MKSI) show any option exercises or derivatives?

No, this Form 4 only reports a non-derivative transaction involving Common Stock. The derivativeSummary section is empty, indicating there were no reported option exercises, conversions, or other derivative security transactions in this filing.