MKS Inc director sells 300 shares in open trade

MKS Inc director Elizabeth Mora reported an open-market sale of 300 shares of MKS Inc Common Stock at $318.02 per share on June 1, 2026.

Rhea-AI Filing Summary

MKS Inc director Elizabeth Mora reported an open-market sale of 300 shares of MKS Inc Common Stock at $318.02 per share on June 1, 2026. The sale was executed under a pre-arranged Rule 10b5-1 trading plan adopted on February 23, 2026. After this transaction, she directly holds 19,145.353 shares of MKS Inc Common Stock.

Insider Trade Summary 10b5-1

Net Seller: 300 shares

Net Sell 1 txn

Insider Mora Elizabeth

Role Director

Sold 300 shs ($95K)

Type	Security	Shares	Price	Value
Sale	Common Stock	300	$318.02	$95K

Holdings After Transaction: Common Stock — 19,145.353 shares (Direct)

Footnotes (1)

1. F1. This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 23, 2026.

Key Figures

Shares sold: 300 shares Sale price per share: $318.02 per share Shares held after transaction: 19,145.353 shares +2 more

5 metrics

Shares sold 300 shares Open-market sale of MKS Inc Common Stock on June 1, 2026

Sale price per share $318.02 per share Price for the 300-share Common Stock sale

Shares held after transaction 19,145.353 shares Director’s direct ownership following the reported sale

Transaction code S Classified as sale in open market or private transaction

Plan type Rule 10b5-1 trading plan Plan adopted February 23, 2026 governing this sale

Key Terms

Rule 10b5-1 trading plan, open-market sale, Common Stock, Form 4

4 terms

Rule 10b5-1 trading plan regulatory

"This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

open-market sale financial

"transaction_action is described as an open-market sale of Common Stock"

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

"The security title for the reported transaction is Common Stock of MKS Inc"

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

"The insider transaction is disclosed on a Form 4 filing for MKS 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.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did MKS Inc (MKSI) director Elizabeth Mora report?

Elizabeth Mora reported selling 300 shares of MKS Inc Common Stock. The open-market sale occurred at a price of $318.02 per share on June 1, 2026, and was disclosed on a Form 4 insider trading report for MKS Inc.

At what price did Elizabeth Mora sell MKS Inc (MKSI) shares?

She sold her MKS Inc shares at $318.02 per share. The Form 4 filing shows an open-market transaction involving 300 shares of Common Stock at this price, providing a clear record of the sale terms for investors tracking insider activity.

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

After the transaction, Elizabeth Mora directly holds 19,145.353 shares. This post-transaction holding, disclosed in the Form 4, indicates that she retains a sizable ownership position in MKS Inc Common Stock following the reported open-market sale.

Was the MKS Inc (MKSI) insider sale made under a Rule 10b5-1 plan?

Yes, the sale was made under a Rule 10b5-1 trading plan. A footnote explains the transaction was effected pursuant to a Rule 10b5-1 plan adopted by Elizabeth Mora on February 23, 2026, indicating the trade was pre-arranged.

What type of transaction did the MKS Inc (MKSI) Form 4 report for Elizabeth Mora?

The Form 4 reports an open-market sale of Common Stock. It classifies the transaction with code "S," described as a sale in an open market or private transaction, covering 300 MKS Inc Common Stock shares sold directly by the director.

Does the MKS Inc (MKSI) Form 4 show any option exercises or derivative trades?

No derivative transactions are shown in this Form 4 excerpt. The filing lists a single non-derivative transaction in Common Stock, with the derivativeSummary section empty, indicating no reported option exercises or other derivative activity for this date.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 06/02/2026 - 03:08 PM EDT 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).

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 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)
06/01/2026

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	06/01/2026		S(1)		300	D	$318.02	19,145.353	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 23, 2026.

	/s/ M. Kathryn Rickards, attorney-in-fact	06/02/2026
	** 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)