Sec Form 4 Filing - BERTUCCI JOHN R @ MKS INSTRUMENTS INC - 2018-05-02

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

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, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person BERTUCCI JOHN R 2. Issuer Name and Ticker or Trading Symbol MKS INSTRUMENTS INC [ MKSI] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 2 TECH DRIVE 3. Date of Earliest Transaction (MM/DD/YY) 05/02/2018 (Street) ANDOVER, MA01810 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 05/02/2018 G V 60,996 D $ 0 0 I By John R. Bertucci 2016 Qualified Annuity Trust ( 1 ) Common Stock 05/02/2018 G V 68,336 D $ 0 0 I By Claire R. Bertucci 2016 Qualified Annuity Trust ( 2 ) Common Stock 197,248.102 D Common Stock 51,000 I By Claire R. Bertucci 2016 Second Qualified Annuity Trust Common Stock 27,782 I By John R. Bertucci 2016 Second Qualified Annuity Trust Common Stock 186,505 I By Spouse

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Co de (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (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 of Derivative Security: 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

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other BERTUCCI JOHN R 2 TECH DRIVE ANDOVER, MA01810 X Signatures /s/ M. Kathryn Rickards, attorney-in-fact 05/04/2018 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The reporting person's 2016 Grantor Retained Annuity Trust terminated. On May 2, 2018, 60,996 shares in this trust were transferred to the reporting person's beneficiaries and the remaining 25,976 shares were distributed to the reporting person and are reported in this Form 4 as directly owned by the reporting person. ( 2 )The reporting person's spouse's 2016 Grantor Retained Annuity Trust terminated. On May 2, 2018, 68,336 shares in this trust were transferred to the reporting person's spouse's beneficiaries and the remaining 19,355 shares were distributed to the reporting person's spouse and continue to be reported in this Form 4 as indirectly owned by the reporting person's spouse.

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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