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MKS Inc (MKSI) EVP Renee Martel Donlan reports initial common stock and RSU stake

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
3

Rhea-AI Filing Summary

MKS Inc EVP, GC & CCO Renee Martel Donlan filed an initial ownership report showing her equity stake in the company. She directly holds 9,471.7084 shares of common stock and several restricted stock unit (RSU) awards tied to common shares that vest in installments beginning on April 15, 2027.

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Insider Donlan Renee Martel
Role EVP, GC & CCO
Type Security Shares Price Value
holding Restricted Stock Unit -- -- --
holding Restricted Stock Unit -- -- --
holding Restricted Stock Unit -- -- --
holding Common Stock -- -- --
Holdings After Transaction: Restricted Stock Unit — 415.813 shares (Direct, null); Common Stock — 9,471.708 shares (Direct, null)
Footnotes (1)
  1. These restricted stock units (RSUs) vest on April 15, 2027. Each RSU represents the contingent right to receive one share of common stock of MKS Inc. These RSUs vest in two equal annual installments commencing on April 15, 2027, provided that if, in any vesting year, April 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 April 15, 2027, provided that if, in any vesting year, April 15th is not a business day, such vesting shall occur on the next business day.
Direct common stock holdings 9,471.7084 shares Beneficial ownership reported on Form 3
RSU underlying shares grant 1 929.3680 shares Restricted stock units tied to common stock
RSU underlying shares grant 2 2,481.3460 shares Restricted stock units tied to common stock
RSU underlying shares grant 3 415.8130 shares Restricted stock units tied to common stock
RSU vesting start date April 15, 2027 Initial and installment vesting for RSU awards
Restricted Stock Unit financial
"These restricted stock units (RSUs) vest on April 15, 2027."
A restricted stock unit is a promise from a company to give an employee shares of stock after certain conditions are met, like staying with the company for a set amount of time. It’s like earning a bonus that turns into company stock once you’ve proven your commitment, making it a way to motivate and reward employees.
RSUs financial
"These RSUs vest in two equal annual installments commencing on April 15, 2027,"
RSUs, or restricted stock units, are a form of company shares given to employees as part of their compensation. They are typically awarded with certain restrictions, such as a waiting period before they can be fully owned or sold, similar to earning a gift that becomes fully yours over time. For investors, RSUs can impact a company's stock offerings and reflect how much the company relies on stock-based incentives to attract and retain talent.
contingent right financial
"Each RSU represents the contingent right to receive one share of common stock of MKS Inc."
Common Stock financial
"Each RSU represents the contingent right to receive one share of common stock of MKS Inc."
Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.
beneficial ownership financial
"The Form 3 shows Renee Martel Donlan’s initial report of ownership in MKS Inc."
Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.
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Learn about SEC filing dates
SEC Form 3
FORM 3UNITED 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
OMB APPROVAL
OMB Number:3235-0104
Estimated average burden
hours per response:0.5
1. Name and Address of Reporting Person*
Donlan Renee Martel

(Last)(First)(Middle)
C/O MKS INC.
2 TECH DRIVE

(Street)
ANDOVER MASSACHUSETTS 01810

(City)(State)(Zip)

UNITED STATES

(Country)
2. Date of Event Requiring Statement (Month/Day/Year)
06/01/2026
3. Issuer Name and Ticker or Trading Symbol
MKS INC [ MKSI ]
3a. Foreign Trading Symbol
5. If Amendment, Date of Original Filed (Month/Day/Year)
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director10% Owner
XOfficer (give title below)Other (specify below)
EVP, GC & CCO
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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 Stock9,471.7084D
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)
Date ExercisableExpiration DateTitleAmount or Number of Shares
Restricted Stock Unit (1) (1)Common Stock415.813(2)D
Restricted Stock Unit (3) (3)Common Stock2,481.346(2)D
Restricted Stock Unit (4) (4)Common Stock929.368(2)D
Explanation of Responses:
1. These restricted stock units (RSUs) vest on April 15, 2027.
2. Each RSU represents the contingent right to receive one share of common stock of MKS Inc.
3. These RSUs vest in two equal annual installments commencing on April 15, 2027, 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, 2027, provided that if, in any vesting year, April 15th 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-fact06/04/2026
** Signature of Reporting PersonDate
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.
* Form 3: SEC 1473 (03-26)

FAQ

What does the MKS Inc (MKSI) Form 3 filed by Renee Martel Donlan show?

The Form 3 shows Renee Martel Donlan’s initial report of ownership in MKS Inc. It lists her direct holdings of common stock and multiple restricted stock unit awards that convert into common shares as they vest over time starting in 2027.

How many MKS Inc (MKSI) common shares does Renee Martel Donlan directly hold?

Renee Martel Donlan directly holds 9,471.7084 shares of MKS Inc common stock. This figure reflects her reported beneficial ownership as an executive officer and forms the baseline for future insider trading and compensation-related disclosures involving her equity position.

What restricted stock units (RSUs) are reported for Renee Martel Donlan at MKS Inc (MKSI)?

She reports several RSU holdings, including units covering 929.3680, 2,481.3460 and 415.8130 underlying common shares. Each RSU represents a contingent right to receive one share of MKS Inc common stock as vesting conditions are satisfied over the specified schedule.

When do Renee Martel Donlan’s MKS Inc (MKSI) RSUs start vesting?

The RSUs begin vesting on April 15, 2027. Some grants vest fully on that date, while others vest in equal annual installments starting then, shifting to the next business day if April 15 falls on a non-business day in any vesting year.

What does it mean that each MKS Inc (MKSI) RSU represents a contingent right to one share?

Each RSU gives the holder a contingent right to receive one share of common stock. Delivery occurs only if vesting conditions are met, meaning continued service and timing requirements must be satisfied before the RSUs convert into actual MKS Inc shares.

Is the MKS Inc (MKSI) Form 3 for Renee Martel Donlan a buy or sell transaction?

The Form 3 is not a buy or sell transaction report. It is an initial statement of beneficial ownership that lists her existing common stock and RSU positions when she became a reporting insider, without indicating new purchases or sales on the reported date.