ThZeal - The Zeal

SEC FORM 3 SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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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1. Name and Address of Reporting Person^*

Williams John Edward

(Last)

(First)

(Middle)

C/O MKS INSTRUMENTS, INC.

2 TECH DRIVE, SUITE 201

(Street)

ANDOVER

MA

01810

(City)

(State)

(Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
05/12/2024

3. Issuer Name and Ticker or Trading Symbol
MKS INSTRUMENTS INC [ MKSI ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP & GM, PSD

5. 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 Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	1,174	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
Restricted Stock Unit	⁽¹⁾	⁽¹⁾	Common Stock	914.903	⁽²⁾	D
Restricted Stock Unit	⁽³⁾	⁽³⁾	Common Stock	658.031	⁽²⁾	D
Restricted Stock Unit	⁽⁴⁾	⁽⁴⁾	Common Stock	1,893.285	⁽²⁾	D
Restricted Stock Unit	⁽⁵⁾	⁽⁵⁾	Common Stock	3,480.714	⁽²⁾	D

Explanation of Responses:

1. These restricted stock units (RSUs) were subject to performance criteria, the achievement of which was determined on February 8, 2023, and will vest on February 18, 2025.

2. Each RSU represents the contingent right to receive one share of common stock of MKS Instruments, Inc.

3. These RSUs vest on February 18, 2025.

4. These RSUs vest in two equal annual installments commencing on August 15, 2024, provided that if, in any vesting year, August 15th is not a business day, such vesting shall occur on the next business day.

5. These RSUs vest in two equal annual installments commencing on April 17, 2025, provided that if, in any vesting year, April 17th is not a business day, such vesting shall occur on the next business day.

Remarks:

Exhibit 24 - Power of Attorney

	/s/ M. Kathryn Rickards, attorney-in-fact	05/15/2024
	** 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 5 (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.