MKS Inc (MKSI) CFO reports RSU grants, conversions and tax withholding

Filing Impact

(Very High)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

MKS Inc EVP & CFO Mayampurath Ramakumar reported multiple equity transactions on common stock and restricted stock units. He acquired shares through exercises and conversions of RSUs, received a new RSU award, and had shares of common stock withheld by MKS Inc to cover tax obligations from RSU vesting, which the filing states were not discretionary trades.

Insider Trade Summary

5,660.08 shares exercised/converted

Mixed 6 txns

Insider Mayampurath Ramakumar

Role EVP & CFO

Type	Security	Shares	Price	Value
Grant/Award	Restricted Stock Unit	4,278.543	$0.00	--
Exercise	Restricted Stock Unit	2,958.08	$0.00	--
Exercise	Restricted Stock Unit	2,702	$0.00	--
Exercise	Common Stock	2,958.08	$0.00	--
Exercise	Common Stock	2,702	$0.00	--
Tax Withholding	Common Stock	2,515.941	$260.74	$656K

Holdings After Transaction: Restricted Stock Unit — 29,558.533 shares (Direct); Common Stock — 8,625.08 shares (Direct)

Footnotes (1)

Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc. These shares were withheld by MKS Inc. to satisfy the tax withholding obligations triggered by the vesting of RSUs and do not represent a discretionary trade by the reporting person. These RSUs vest in three equal annual installments commencing on February 15, 2027, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day. 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. These RSUs vest in three equal annual installments commencing 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 →

02/18/2026 - 04:58 PM

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

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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^*

Mayampurath Ramakumar

(Last)

(First)

(Middle)

C/O MKS INC.

2 TECH DRIVE

(Street)

ANDOVER

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 & CFO

3. Date of Earliest Transaction (Month/Day/Year)
02/17/2026

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)
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	02/17/2026		M		2,958.08	A	⁽¹⁾	8,625.08	D
Common Stock	02/17/2026		M		2,702	A	⁽¹⁾	11,327.08	D
Common Stock	02/17/2026		F⁽²⁾		2,515.941	D	$260.74	8,811.139	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)
Restricted Stock Unit	⁽¹⁾	02/17/2026		A		4,278.543		⁽³⁾	⁽³⁾	Common Stock	4,278.543	⁽¹⁾	29,558.533	D
Restricted Stock Unit	⁽¹⁾	02/17/2026		M			2,958.08	⁽⁴⁾	⁽⁴⁾	Common Stock	2,958.08	⁽¹⁾	26,600.453	D
Restricted Stock Unit	⁽¹⁾	02/17/2026		M			2,702	⁽⁵⁾	⁽⁵⁾	Common Stock	2,702	⁽¹⁾	23,898.453	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 shares were withheld by MKS Inc. to satisfy the tax withholding obligations triggered by the vesting of RSUs and do not represent a discretionary trade by the reporting person.

3. These RSUs vest in three equal annual installments commencing on February 15, 2027, provided that if, in any vesting year, February 15th is not a business day, such vesting shall occur on the next business day.

4. 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.

5. These RSUs vest in three equal annual installments commencing 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	02/18/2026
	** 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.
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Source: View Original Filing on SEC EDGAR

FAQ

What insider transactions did MKS Inc (MKSI) CFO Mayampurath Ramakumar report?

He reported RSU-related activity and common stock movements on February 17, 2026. Transactions included RSU exercises or conversions, a new RSU grant, and common shares withheld by MKS Inc to satisfy tax obligations arising from RSU vesting events.

Did the MKS Inc (MKSI) CFO buy or sell shares in the open market?

The filing does not show open-market purchases or sales. It reports RSU exercises or conversions and shares withheld by MKS Inc for tax withholding, which the footnotes state do not represent discretionary trades by the reporting person.

What new restricted stock units did the MKS Inc (MKSI) CFO receive?

He acquired 4,278.543 restricted stock units as a grant or award. Footnotes state these RSUs vest in three equal annual installments beginning February 15, 2027, or the next business day if that date is not a business day.

How were taxes handled on the MKS Inc (MKSI) CFO’s RSU vesting?

MKS Inc withheld 2,515.941 shares of common stock at $260.7400 per share to satisfy tax withholding obligations. A footnote clarifies this withholding does not represent a discretionary trade by the reporting person.

What vesting schedule applies to the MKS Inc (MKSI) CFO’s performance-based RSUs?

Certain RSUs were subject to performance criteria determined on February 8, 2026. After that determination, they vest in three equal annual installments starting February 15, 2026, or the next business day if that date is not a business day.