MKS Inc (NASDAQ: MKSI) director receives 781.959 restricted stock units grant

Filing Impact

(Neutral)

Filing Sentiment

(Neutral)

Form Type

Rhea-AI Filing Summary

Moloney Jacqueline F reported acquisition or exercise transactions in this Form 4 filing.

MKS Inc director Jacqueline F. Moloney received an equity award in the form of restricted stock units (RSUs). She was granted 781.959 shares of common stock-equivalent RSUs at no cash cost, increasing her direct holdings to 11,175.156 shares of common stock.

The RSUs will fully vest on the day before the first annual meeting of shareholders following the grant date, or, if no such meeting occurs within 13 months, on the 13‑month anniversary of the grant. Each RSU represents the right to receive one share of MKS Inc common stock upon vesting.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Moloney Jacqueline F

Role null

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

Holdings After Transaction: Common Stock — 11,175.156 shares (Direct, null)

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

Key Figures

RSU grant size: 781.959 shares Holdings after grant: 11,175.156 shares Vesting trigger: Day before first annual meeting or 13 months +1 more

4 metrics

RSU grant size 781.959 shares Restricted stock units granted to director on the transaction date

Holdings after grant 11,175.156 shares Total common stock directly held after the RSU award

Vesting trigger Day before first annual meeting or 13 months RSUs vest before the next annual shareholder meeting or after 13 months

Grant price $0.0000 per share Reported acquisition price for the RSU award

Key Terms

restricted stock units, annual meeting of shareholders, contingent right, common stock

4 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

"…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…"

common stock financial

"Each restricted stock unit 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.

Form 4 Insider Transactions: What Each Field Means →

05/12/2026 - 03:17 PM

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^*

Moloney Jacqueline F

(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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	05/11/2026		A⁽¹⁾		781.959	A	⁽²⁾	11,175.156	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

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)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did MKS Inc (MKSI) report for Jacqueline F. Moloney?

MKS Inc reported that director Jacqueline F. Moloney received 781.959 restricted stock units. These RSUs are an equity award, not an open-market purchase or sale, and increase her direct common stock holdings to 11,175.156 shares after the grant.

How many shares did Jacqueline F. Moloney hold after the latest MKSI Form 4 filing?

After the reported RSU grant, Jacqueline F. Moloney directly holds 11,175.156 shares of MKS Inc common stock. This total includes the effect of the 781.959 restricted stock units granted to her as disclosed in the Form 4 filing.

What are the vesting terms of Jacqueline F. Moloney’s MKS Inc restricted stock units?

The restricted stock units vest fully the day before the first annual shareholder meeting after the grant. If no such meeting occurs within 13 months, they vest on the 13‑month anniversary of the grant, according to the Form 4 footnotes.

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

Each restricted stock unit represents a contingent right to receive one share of MKS Inc common stock. Once the vesting conditions are met, the RSUs convert into common shares on a one‑for‑one basis, as specified in the Form 4 footnotes.

Was the MKS Inc transaction a market buy or sell by Jacqueline F. Moloney?

The transaction was not a market buy or sell. It was a grant of 781.959 restricted stock units to director Jacqueline F. Moloney as compensation, with zero purchase price per share reported in the filing.