MKS Inc (MKSI) EVP sells 6,000 common shares in open market

Rhea-AI Filing Summary

MKS Inc executive Henry David Philip reported an open-market sale of company stock. On June 1, 2026, he sold 6,000 shares of MKS Inc Common Stock in an open-market transaction at a weighted average price of $314.4305 per share. Following this sale, he directly owns 10,421.527 shares of MKS Inc Common Stock. The filing notes the trade was executed in multiple lots at prices ranging from $314.2425 to $314.955, with the reported price representing the weighted average.

Insider Trade Summary

Net Seller: 6,000 shares ($1,886,583)

Net Sell 1 txn

Insider Henry David Philip

Role EVP, Global Str Mktg & GM, MSD

Sold 6,000 shs ($1.89M)

Type	Security	Shares	Price	Value
Sale	Common Stock	6,000	$314.4305	$1.89M

Holdings After Transaction: Common Stock — 10,421.527 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Shares sold: 6,000 shares Weighted average sale price: $314.4305 per share Price range of trades: $314.2425–$314.955 per share +2 more

5 metrics

Shares sold 6,000 shares Open-market sale of Common Stock on June 1, 2026

Weighted average sale price $314.4305 per share Average price for 6,000 shares sold

Price range of trades $314.2425–$314.955 per share Range of individual trade prices in the sale

Shares owned after transaction 10,421.527 shares Direct holdings following the sale

Net shares sold in filing 6,000 shares Net sell direction per transaction summary

Key Terms

open-market sale, Common Stock, weighted average sale price, Form 4

4 terms

open-market sale financial

"he sold 6,000 shares of MKS Inc Common Stock in an open-market transaction"

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

"he sold 6,000 shares of MKS Inc Common Stock in an open-market transaction"

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"

Form 4 regulatory

"was disclosed in a Form 4 insider trading report"

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.

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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^*

Henry David Philip

(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, Global Str Mktg & GM, MSD

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		6,000	D	$314.4305(1)	10,421.527	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 $314.2425 to $314.955. 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	06/02/2026
	** 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)

FAQ

What insider transaction did MKS Inc (MKSI) report for Henry David Philip?

MKS Inc reported that EVP Henry David Philip sold 6,000 shares of Common Stock in an open-market transaction. The sale occurred on June 1, 2026, and was disclosed in a Form 4 insider trading report.

At what price did Henry David Philip sell MKS Inc (MKSI) shares?

He sold the 6,000 MKS Inc shares at a weighted average price of $314.4305 per share. Individual trade prices ranged from $314.2425 to $314.955, according to the transaction footnote.

How many MKS Inc (MKSI) shares does Henry David Philip hold after the sale?

After the reported sale, Henry David Philip directly owns 10,421.527 shares of MKS Inc Common Stock. This post-transaction holding is disclosed in the Form 4 as total shares following the transaction.

What type of transaction did MKS Inc (MKSI) disclose for Henry David Philip?

The company disclosed an open-market sale of Common Stock by Henry David Philip. The Form 4 classifies the event as a non-derivative transaction with transaction code “S,” indicating a sale in the open market or a private transaction.

Did the MKS Inc (MKSI) filing mention multiple trade prices for the insider sale?

Yes. The footnote explains the sale was executed in multiple trades at prices between $314.2425 and $314.955. The reported $314.4305 figure represents the weighted average sale price across those individual trades.