MKS Inc (MKSI) director granted 782 restricted stock units in Form 4

Rhea-AI Filing Summary

JABRE WISSAM G reported acquisition or exercise transactions in this Form 4 filing.

MKS Inc director Wissam G. Jabre received an equity award of 781.959 restricted stock units, each tied to one share of common stock at no cost per unit. These units become fully vested on the day before the first annual shareholder meeting following the grant date, or on the 13‑month anniversary if no meeting occurs within that period. After this grant, he directly holds 5,269.935 shares or equivalent units.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider JABRE WISSAM G

Role null

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	781.959	$0.00	--

Holdings After Transaction: Common Stock — 5,269.935 shares (Direct, null)

Footnotes (1)

1. These restricted stock units become fully vested on the day prior to the first annual meeting of shareholders following the date of grant (or if no such meeting is held within 13 months after the date of grant, on the 13 month anniversary of the date of grant). Each restricted stock unit represents the contingent right to receive one share of common stock of MKS Inc.

Key Figures

Restricted stock units granted: 781.959 units Price per unit: $0.0000 per share Holdings after transaction: 5,269.935 shares

3 metrics

Restricted stock units granted 781.959 units Equity award to director on 2026-05-11

Price per unit $0.0000 per share Grant/award acquisition

Holdings after transaction 5,269.935 shares Total direct position following grant

Key Terms

restricted stock units, annual meeting of shareholders, contingent right

3 terms

restricted stock units financial

"These restricted stock units become fully vested on the day prior to the first annual meeting of shareholders"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

annual meeting of shareholders financial

"on the day prior to the first annual meeting of shareholders following the date of grant"

A yearly gathering where a company’s owners (shareholders) vote on key items like electing the board, approving executive pay, and ratifying auditors, and receive updates on performance and strategy. Think of it as an annual town hall for owners: it matters to investors because outcomes and disclosures can affect leadership, corporate direction, dividend and governance policies, and therefore the company’s risk and potential return.

contingent right financial

"Each restricted stock unit represents the contingent right to receive one share of common stock"

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^*

JABRE WISSAM G

(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)
05/11/2026

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	05/11/2026		A(1)		781.959	A	(2)	5,269.935	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. These restricted stock units become fully vested on the day prior to the first annual meeting of shareholders following the date of grant (or if no such meeting is held within 13 months after the date of grant, on the 13 month anniversary of the date of grant).

2. Each restricted stock unit represents the contingent right to receive one share of common stock of MKS Inc.

	/s/ M. Kathryn Rickards, attorney-in-fact	05/12/2026
	** 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 Wissam G. Jabre?

MKS Inc reported that director Wissam G. Jabre received 781.959 restricted stock units as an equity award. Each unit represents a contingent right to one share of common stock, granted at no cash cost per unit.

How many MKS Inc restricted stock units were granted in this Form 4 filing?

The filing shows a grant of 781.959 restricted stock units to director Wissam G. Jabre. Each restricted stock unit corresponds to one share of MKS Inc common stock upon settlement, according to the disclosure footnotes.

What is the vesting schedule for Wissam G. Jabre’s MKS Inc restricted stock units?

These restricted stock units fully vest on the day before the first annual shareholders’ meeting after the grant date. If no meeting occurs within 13 months, they vest on the 13‑month anniversary of the grant, as described in the footnotes.

What does each MKS Inc restricted stock unit represent in this Form 4?

Each restricted stock unit represents a contingent right to receive one share of MKS Inc common stock. The units convert into shares when vesting conditions are satisfied, aligning director compensation with future company performance and share ownership.

How many MKS Inc shares does Wissam G. Jabre hold after this RSU grant?

After the reported transaction, Wissam G. Jabre directly holds 5,269.935 shares or equivalent units of MKS Inc common stock. This total includes the newly granted 781.959 restricted stock units disclosed in the Form 4 filing.