MKS EVP & COO sells 3,500 shares in open market

MKS Inc EVP & COO James Alan Schreiner reported selling a total of 3,500 shares of MKS Inc common stock on June 12, 2026 in three open-market transactions.

Accepted by SEC EDGAR 06/16/2026 - 05:35 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

MKS Inc EVP & COO James Alan Schreiner reported selling a total of 3,500 shares of MKS Inc common stock on June 12, 2026 in three open-market transactions. The shares were sold at weighted average prices of $347.00, $346.41 and $345.52 per share. After these sales, Schreiner directly holds 19,201.121 MKS Inc common shares.

Insider Trade Summary

Net Seller: 3,500 shares

Net Sell 3 txns

Insider Schreiner James Alan

Role EVP & COO

Sold 3,500 shs ($1.21M)

Type	Security	Shares	Price	Value
Sale	Common Stock	2,471	$345.5239	$854K
Sale	Common Stock	812	$346.4058	$281K
Sale	Common Stock	217	$347.00	$75K

Holdings After Transaction: Common Stock — 19,201.121 shares (Direct)

Footnotes (2)

1. F1. This transaction was executed in multiple trades at prices ranging from $345.000 to $345.935. 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.
2. F2. This transaction was executed in multiple trades at prices ranging from $346.000 to $346.795. 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.

Key Figures

Total shares sold: 3,500 shares Sale price 1: $347.00 per share Sale price 2: $346.4058 per share +2 more

5 metrics

Total shares sold 3,500 shares Open-market sales on June 12, 2026

Sale price 1 $347.00 per share Weighted average price for 217 shares sold

Sale price 2 $346.4058 per share Weighted average price for 812 shares sold

Sale price 3 $345.5239 per share Weighted average price for 2,471 shares sold

Shares owned after 19,201.121 shares Direct common stock holdings following the sales

Key Terms

open-market sale, Common Stock, weighted average sale price

3 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.

weighted average sale price financial

"The price reported above reflects the weighted average sale price."

FAQ

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

What insider transaction did MKS Inc (MKSI) report for James Alan Schreiner?

MKS Inc reported that EVP & COO James Alan Schreiner sold 3,500 common shares. The Form 4 shows three open-market sale transactions on June 12, 2026, with weighted average sale prices in the mid-$340s per share and remaining direct ownership of 19,201.121 shares.

How many MKS Inc (MKSI) shares did the EVP & COO sell and at what prices?

James Alan Schreiner sold 3,500 MKS Inc common shares in total. The Form 4 discloses weighted average sale prices of $347.00, $346.4058 and $345.5239 per share across three separate open-market transactions executed on June 12, 2026.

How many MKS Inc (MKSI) shares does James Alan Schreiner hold after the reported sales?

After the reported transactions, Schreiner directly holds 19,201.121 MKS Inc shares. This post-transaction balance reflects his remaining common stock ownership following the combined open-market sale of 3,500 shares disclosed in the Form 4 filing.

What does an open-market sale mean in the MKS Inc (MKSI) Form 4?

An open-market sale is a transaction executed on a public stock exchange at market prices. The Form 4 notes Schreiner’s sales as open-market transactions, with prices determined by trading activity rather than a pre-set private agreement or equity grant terms.

Were the MKS Inc (MKSI) insider sales by Schreiner executed in multiple trades?

Yes, the filing states the sales were executed in multiple trades within price ranges. Footnotes explain that certain transactions occurred at prices ranging between specified dollar amounts, and that full trade and price details are available upon request from the reporting person.

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

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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^*

Schreiner James Alan

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/12/2026

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	06/12/2026		S		2,471	D	$345.5239(1)	20,230.121	D
Common Stock	06/12/2026		S		812	D	$346.4058(2)	19,418.121	D
Common Stock	06/12/2026		S		217	D	$347	19,201.121	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 $345.000 to $345.935. 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.

2. This transaction was executed in multiple trades at prices ranging from $346.000 to $346.795. 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	06/16/2026
	** 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)