MKS Inc director awarded 781.959 RSUs

CANNONE PETER III reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

CANNONE PETER III reported acquisition or exercise transactions in this Form 4 filing.

MKS Inc director Peter Cannone III reported an equity award on Form 4. He received 781.959 restricted stock units, each representing the right to receive one share of MKS common stock. These units vest in full just before the first annual shareholder meeting following the grant. After this award, he directly holds 9,144.039 shares of common stock.

Insider Trade Summary

Grant/Award: 781.959 shares

Grant/Award 1 txn

Insider CANNONE PETER III

Role Director

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

Holdings After Transaction: Common Stock — 9,144.039 shares (Direct)

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

RSUs granted: 781.959 restricted stock units Post-award holdings: 9,144.039 shares Grant price: $0.0000 per share +2 more

5 metrics

RSUs granted 781.959 restricted stock units Equity award to director Peter Cannone III

Post-award holdings 9,144.039 shares Common stock held directly after transaction

Grant price $0.0000 per share Stated transaction price for awarded units

Vesting timing Day prior to first annual meeting after grant Full vesting trigger for RSUs

Alternative vesting date 13-month anniversary of grant If no annual meeting within 13 months

Key Terms

restricted stock units, annual meeting of shareholders, contingent right

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.

annual meeting of shareholders financial

"become fully vested 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.

contingent right financial

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

FAQ

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

What insider transaction did MKS Inc (MKSI) director Peter Cannone III report?

Director Peter Cannone III reported an equity award on Form 4. He received 781.959 restricted stock units, each tied to one MKS common share, increasing his direct holdings to 9,144.039 shares after the grant.

How many restricted stock units did Peter Cannone III receive from MKS Inc (MKSI)?

Peter Cannone III received 781.959 restricted stock units from MKS Inc. Each unit represents a contingent right to one share of common stock, granted at a stated price of $0.0000 per share as part of his director compensation.

When do Peter Cannone III’s MKS Inc restricted stock units vest?

The restricted stock units become fully vested the day before the first annual meeting of shareholders after the grant date. If no meeting occurs within 13 months, they vest on the 13‑month anniversary of the grant date, according to the award terms.

What does each restricted stock unit represent in the MKS Inc (MKSI) Form 4?

Each restricted stock unit represents the contingent right to receive one share of MKS Inc common stock. This means the director does not receive the shares immediately but gains them once the vesting conditions described in the award are satisfied.

What are Peter Cannone III’s MKS Inc share holdings after this Form 4 award?

Following the reported grant, Peter Cannone III directly holds 9,144.039 shares of MKS Inc common stock. This total reflects his position after adding the 781.959 restricted stock units reported as an acquisition of common stock in the filing.

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

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Accepted by SEC EDGAR 05/12/2026 - 03:04 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^*

CANNONE PETER III

(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)	9,144.039	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

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)