MKS Inc (MKSI) COO logs 781-share Rule 10b5-1 stock sale

Filing Impact

(Moderate)

Filing Sentiment

(Negative)

Form Type

Rhea-AI Filing Summary

MKS Inc executive James Alan Schreiner, the company’s EVP & COO, reported an open-market sale of 781 shares of Common Stock on June 10, 2026 at an average price of $317.42 per share.

After this transaction, Schreiner directly holds 22,701.121 shares of MKS Inc common stock. The sale was executed under a pre-arranged Rule 10b5-1 trading plan that he adopted on March 10, 2026, indicating the trade was scheduled in advance rather than timed discretionarily.

Insider Trade Summary 10b5-1

Net Seller: 781 shares ($247,905)

Net Sell 1 txn

Insider Schreiner James Alan

Role EVP & COO

Sold 781 shs ($248K)

Type	Security	Shares	Price	Value
Sale	Common Stock	781	$317.42	$248K

Holdings After Transaction: Common Stock — 22,701.121 shares (Direct, null)

Footnotes (1)

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Key Figures

Shares sold: 781 shares Sale price: $317.42 per share Shares held after: 22,701.121 shares +2 more

5 metrics

Shares sold 781 shares Open-market sale on June 10, 2026

Sale price $317.42 per share Average price for the 781 shares sold

Shares held after 22,701.121 shares Direct ownership following the transaction

Net share change -781 shares Net buy/sell shares from transaction summary

Sell transactions 1 sale Single open-market sale reported on Form 4

Key Terms

Rule 10b5-1 trading plan, open-market sale, Form 4, Executive Vice President and Chief Operating Officer

4 terms

Rule 10b5-1 trading plan regulatory

"transaction was effected pursuant to a Rule 10b5-1 trading plan adopted"

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.

Form 4 regulatory

"reported in a Form 4 insider 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.

Executive Vice President and Chief Operating Officer financial

"reporting person is EVP & COO of MKS Inc"

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Form 4 Insider Transactions: What Each Field Means →

06/11/2026 - 10:40 AM

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)
06/10/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	06/10/2026		S⁽¹⁾		781	D	$317.42	22,701.121	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

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

	/s/ M. Kathryn Rickards, attorney-in-fact	06/11/2026
	** 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)

Source: View Original Filing on SEC EDGAR

FAQ

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

MKS Inc reported that EVP & COO James Alan Schreiner sold 781 shares of common stock in an open-market transaction. The sale occurred on June 10, 2026 at an average price of $317.42 per share, as disclosed in a Form 4 filing.

How many MKS Inc (MKSI) shares did James Alan Schreiner sell and at what price?

James Alan Schreiner sold 781 shares of MKS Inc common stock at an average price of $317.42 per share. This was an open-market sale reported on Form 4, reflecting a relatively small portion of his total direct holdings.

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

Following the June 10, 2026 transaction, James Alan Schreiner directly holds 22,701.121 MKS Inc common shares. This post-transaction balance shows he retains a substantial equity position despite the reported 781-share open-market sale.

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

Yes. The filing states the transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by James Alan Schreiner on March 10, 2026. Such pre-arranged plans schedule trades in advance, reducing the significance of short-term market timing.

What role does James Alan Schreiner hold at MKS Inc (MKSI)?

James Alan Schreiner serves as Executive Vice President and Chief Operating Officer at MKS Inc. His Form 4 filing reports personal trading activity in company common stock, including the June 10, 2026 open-market sale of 781 shares.