MKS Inc. (MKSI) EVP granted 3,504 performance-based RSUs vesting over 3 years

Rhea-AI Filing Summary

MKS Inc. executive Eric Robert Taranto received 3,504.314 performance-based restricted stock units (RSUs) on February 8, 2026. Each RSU represents the right to receive one share of MKS common stock. After this award, he beneficially owns 12,742.601 derivative securities in the form of RSUs.

The RSUs were tied to performance criteria that were determined to be achieved on February 8, 2026. They will vest in three equal annual installments starting on February 15, 2026, or the next business day if that date is not a business day.

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

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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^*

Taranto Eric Robert

(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 & GM, VSD

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		3,504.314		(2)	(2)	Common Stock	3,504.314	(1)	12,742.601	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).
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FAQ

What insider transaction did MKS Inc. (MKSI) report for Eric Robert Taranto?

MKS Inc. reported a grant of 3,504.314 restricted stock units (RSUs) to EVP & GM, VSD, Eric Robert Taranto. The grant was dated February 8, 2026 and reflects performance-based equity compensation tied to MKS common stock.

How many MKS Inc. (MKSI) RSUs does Eric Robert Taranto hold after this Form 4?

After the reported transaction, Eric Robert Taranto beneficially owns 12,742.601 RSUs. These are derivative securities representing rights to receive MKS common shares, and the newly granted 3,504.314 RSUs are included in this updated total.

What are the vesting terms of the 3,504.314 MKS Inc. (MKSI) RSUs?

The 3,504.314 RSUs vest in three equal annual installments. Vesting begins on February 15, 2026, with remaining installments on the same date in later years, or the next business day if February 15 is not a business day.

Were the new MKS Inc. (MKSI) RSUs granted to Eric Robert Taranto performance-based?

Yes, the RSUs were subject to performance criteria. The company determined that the performance goals were achieved on February 8, 2026. Following that determination, the RSUs became eligible to vest over three annual installments starting February 15, 2026.

What does each restricted stock unit (RSU) from MKS Inc. (MKSI) represent?

Each MKS Inc. RSU represents the contingent right to receive one share of common stock. When RSUs vest, the holder is entitled to receive the corresponding number of MKS common shares, subject to the company’s plan and any applicable conditions.

Is the 2026 RSU grant to Eric Robert Taranto a purchase or a zero-cost award?

The Form 4 shows the RSU grant with a price per unit of 0.0000. This indicates it is an equity award granted as part of compensation, not a market purchase, and does not involve a cash payment per RSU by the executive.