MKS Inc director granted 781 RSUs in Form 4

COLELLA GERALD G reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

COLELLA GERALD G reported acquisition or exercise transactions in this Form 4 filing.

MKS Inc director Gerald G. Colella reported a compensation-related equity grant. On May 11, 2026, he received 781.959 shares of common stock at $0.00 per share as a grant of restricted stock units that vest before the next annual shareholder meeting. After this award, he holds 8,998.886 common shares directly and 40,017 shares indirectly through The Gerald G. Colella 2019 Trust.

Insights

Equity compensation analyst

Routine director equity grant with no open-market buying or selling.

Gerald G. Colella, a director of MKS Inc, received 781.959 restricted stock units on May 11, 2026. The grant price is $0.00 per share, indicating a standard equity award rather than a market transaction.

The footnotes state these restricted stock units vest in full before the first annual meeting of shareholders following the grant date, or by the 13‑month anniversary if no meeting occurs. Each unit converts into one common share, increasing his direct equity stake as they vest.

Following this award, Colella holds 8,998.886 shares directly and 40,017 shares indirectly through The Gerald G. Colella 2019 Trust. The filing shows no open‑market purchases or sales, so the information primarily reflects ongoing director compensation and ownership reporting.

Insider Trade Summary

Grant/Award: 781.959 shares

Grant/Award 2 txns

Insider COLELLA GERALD G

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	781.959	$0.00	$0.00
holding	Common Stock	--	--	--

Holdings After Transaction: Common Stock — 8,998.886 shares (Direct); Common Stock — 40,017 shares (Indirect, By The Gerald G. Colella 2019 Trust)

Footnotes (2)

1. F1. These restricted stock units become fully vested on the day prior to the first annual meeting of shareholders following the date of grant (or if no such meeting is held within 13 months after the date of grant, on the 13 month anniversary of the date of grant).
2. F2. Each restricted stock unit represents the contingent right to receive one share of common stock of MKS Inc.

Key Figures

RSU grant: 781.959 shares Grant price: $0.00 per share Direct holdings after grant: 8,998.886 shares +2 more

5 metrics

RSU grant 781.959 shares Restricted stock units granted on May 11, 2026

Grant price $0.00 per share Price for RSU grant to director

Direct holdings after grant 8,998.886 shares Common stock directly owned post-transaction

Indirect holdings 40,017 shares Held by The Gerald G. Colella 2019 Trust

Transaction date May 11, 2026 Date of RSU grant and holdings entry

Key Terms

restricted stock units, contingent right, annual meeting of shareholders

3 terms

restricted stock units financial

"These restricted stock units become fully vested on the day prior to the first annual meeting of shareholders"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

contingent right financial

"Each restricted stock unit represents the contingent right to receive one share of common stock"

annual meeting of shareholders financial

"on the day prior to the first annual meeting of shareholders following the date of grant"

A yearly gathering where a company’s owners (shareholders) vote on key items like electing the board, approving executive pay, and ratifying auditors, and receive updates on performance and strategy. Think of it as an annual town hall for owners: it matters to investors because outcomes and disclosures can affect leadership, corporate direction, dividend and governance policies, and therefore the company’s risk and potential return.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did MKS Inc (MKSI) director Gerald Colella report?

Gerald G. Colella reported receiving a grant of 781.959 restricted stock units of MKS Inc common stock at $0.00 per share. This is a compensation-related equity award, not an open-market trade, and increases his direct share ownership when the units vest.

How many MKS Inc shares does Gerald Colella own after this Form 4 filing?

After the reported grant, Gerald Colella holds 8,998.886 MKS Inc common shares directly. He also has 40,017 shares reported as indirectly owned through The Gerald G. Colella 2019 Trust, reflecting both personal and trust-related positions in the company.

When do Gerald Colella’s newly granted MKS Inc restricted stock units vest?

The restricted stock units become fully vested the day before the first annual meeting of shareholders following the grant date. If no such meeting occurs within 13 months, they vest on the 13‑month anniversary, providing a clear timeline tied to MKS Inc’s shareholder meeting schedule.

What does each restricted stock unit granted to Gerald Colella represent?

Each restricted stock unit represents the contingent right to receive one share of MKS Inc common stock. Once vesting conditions are met, the units convert into actual shares, increasing Gerald Colella’s direct equity ownership in the company without involving cash payment per share.

Did Gerald Colella buy or sell MKS Inc shares on the open market in this filing?

No open-market purchases or sales are reported in this Form 4. The filing shows a grant of 781.959 restricted stock units at $0.00 per share and an indirect holding entry, indicating compensation and ownership reporting rather than discretionary market trading activity.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/12/2026 - 02:59 PM EDT Learn about SEC filing dates

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^*

COLELLA GERALD G

(Last) (First) (Middle)

C/O MKS INC.

2 TECH DRIVE

(Street)

ANDOVER MASSACHUSETTS 01810

(City) (State) (Zip)

UNITED STATES

(Country)

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

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

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/11/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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	05/11/2026		A(1)		781.959	A	(2)	8,998.886	D
Common Stock								40,017	I	By The Gerald G. Colella 2019 Trust

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

Explanation of Responses:

1. These restricted stock units become fully vested on the day prior to the first annual meeting of shareholders following the date of grant (or if no such meeting is held within 13 months after the date of grant, on the 13 month anniversary of the date of grant).

2. Each restricted stock unit represents the contingent right to receive one share of common stock of MKS Inc.

	/s/ M. Kathryn Rickards, attorney-in-fact	05/12/2026
	** 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.
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 4: SEC 1474 (03-26)