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    VP & Chief Accounting Officer Mccarthy Michelle M converted options into 2,074 shares and covered exercise/tax liability with 608 shares (SEC Form 4)

    4/17/25 1:51:04 PM ET
    $MKSI
    Industrial Machinery/Components
    Industrials
    Get the next $MKSI alert in real time by email
    SEC FORM 4 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*
    McCarthy Michelle M

    (Last) (First) (Middle)
    C/O MKS INSTRUMENTS, INC.
    2 TECH DRIVE, SUITE 201

    (Street)
    ANDOVER MA 01810

    (City) (State) (Zip)
    2. Issuer Name and Ticker or Trading Symbol
    MKS INSTRUMENTS INC [ MKSI ]
    5. Relationship of Reporting Person(s) to Issuer
    (Check all applicable)
    Director 10% Owner
    X Officer (give title below) Other (specify below)
    VP & Chief Accounting Officer
    3. Date of Earliest Transaction (Month/Day/Year)
    04/15/2025
    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
    Common Stock 04/15/2025 M 968 A (1) 968 D
    Common Stock 04/15/2025 M 1,106 A (1) 2,074 D
    Common Stock 04/15/2025 F(2) 608 D $68.48 1,466 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
    Restricted Stock Unit (1) 04/15/2025 M 968 (3) (3) Common Stock 968 (1) 5,422.414 D
    Restricted Stock Unit (1) 04/15/2025 M 1,106 (3) (3) Common Stock 1,106 (1) 4,316.414 D
    Restricted Stock Unit (1) 04/15/2025 A 5,209.884 (4) (4) Common Stock 5,209.884 (1) 9,526.298 D
    Explanation of Responses:
    1. Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Instruments, Inc.
    2. These shares were withheld by MKS Instruments, 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 April 15, 2025, provided that if, in any vesting year, April 15th is not a business day, such vesting shall occur on the next business day.
    4. These RSUs vest in three equal annual installments commencing on April 15, 2026, provided that if, in any vesting year, April 15th is not a business day, such vesting shall occur on the next business day.
    /s/ James Kruger, attorney-in-fact 04/17/2025
    ** 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.
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