MKS Inc. (MKSI) EVP & COO awarded 5,226.759 performance-based RSUs

Rhea-AI Filing Summary

MKS Inc. executive vice president and chief operating officer James Alan Schreiner reported a grant of performance-based restricted stock units. On February 8, 2026, he was awarded 5,226.759 RSUs, each representing the right to receive one share of MKS Inc. common stock.

These RSUs vest in three equal annual installments beginning on February 15, 2026, with vesting moving to the next business day if that date is not a business day. Following this grant, Schreiner beneficially owns 18,244.899 derivative securities in the form of RSUs held directly.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Schreiner James Alan

Role EVP & COO

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Unit	5,226.759	$0.00	--

Holdings After Transaction: Restricted Stock Unit — 18,244.899 shares (Direct)

Footnotes (1)

1. Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc. These RSUs were subject to performance criteria, the achievement of which was determined on February 8, 2026, and thereafter vest in three equal annual installments beginning on February 15, 2026, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

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^*

Schreiner James Alan

(Last) (First) (Middle)

C/O MKS INC.

2 TECH DRIVE

(Street)

ANDOVER MA 01810

(City) (State) (Zip)

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

3. Date of Earliest Transaction (Month/Day/Year)
02/08/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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

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
Restricted Stock Unit	(1)	02/08/2026		A		5,226.759		(2)	(2)	Common Stock	5,226.759	(1)	18,244.899	D

Explanation of Responses:

1. Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc.

2. These RSUs were subject to performance criteria, the achievement of which was determined on February 8, 2026, and thereafter vest in three equal annual installments beginning on February 15, 2026, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

	/s/ M. Kathryn Rickards, attorney-in-fact	02/09/2026
	** 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.

FAQ

What insider transaction did MKSI executive James Alan Schreiner report?

James Alan Schreiner reported receiving 5,226.759 restricted stock units (RSUs) of MKS Inc. on February 8, 2026. Each RSU represents a contingent right to receive one share of MKS Inc. common stock, reflecting equity-based compensation for the EVP & COO.

How many MKSI restricted stock units were granted in the latest Form 4?

The filing shows a grant of 5,226.759 restricted stock units to EVP & COO James Alan Schreiner. These RSUs are derivative securities that convert into an equal number of MKS Inc. common shares upon vesting, subject to the specified vesting schedule and conditions.

What is the vesting schedule for James Alan Schreiner’s MKSI RSUs?

The RSUs vest in three equal annual installments beginning on February 15, 2026. If February 15 in any vesting year is not a business day, vesting occurs on the next business day, aligning delivery of shares with standard market operating days.

Were performance conditions attached to the new MKSI RSU grant?

Yes. The RSUs were subject to performance criteria, with achievement determined on February 8, 2026. Only after that determination do they vest in three equal annual installments, linking executive equity compensation to pre-defined performance outcomes at MKS Inc.

How many MKSI derivative securities does James Alan Schreiner own after this grant?

After the reported grant, James Alan Schreiner beneficially owns 18,244.899 derivative securities in the form of RSUs. These are held directly and represent potential future MKS Inc. common shares, subject to the stated vesting terms and prior performance determination.

What price per unit is shown for the new MKSI RSU award?

The transaction lists a price per restricted stock unit of $0.0000. This indicates the RSUs were awarded without a cash purchase price, consistent with typical equity-based compensation, where value is realized upon vesting and share delivery rather than upfront payment.