MKSI files Form 144 to sell 1,000 vested shares

MKSI files a Form 144 notice of proposed sale of common stock.

Rhea-AI Filing Summary

MKSI files a Form 144 notice of proposed sale of common stock. The filing lists 1,000 shares of Common Stock to be sold on 05/11/2026 arising from Restricted Stock Vesting designated as Compensation. The filing also reports recent dispositions by Jacqueline F. Moloney: 829 shares on 02/20/2026, 341 shares on 03/12/2026, and 1,400 shares on 05/13/2026, each with the dollar amounts shown in the filing.

Insights

Securities Compliance Analyst

Routine Rule 144 notice of resale activity; compensation-related vesting noted.

The filing documents a proposed resale of 1,000 shares tied to Restricted Stock Vesting classified as compensation, and discloses three recent sales by Jacqueline F. Moloney in 2026. This is a regulatory notification of intended/reported transactions.

Timing and cash‑flow recipients are stated by date and dollar amounts in the excerpt; the filing primarily serves to notify market participants and the issuer's transfer agent of planned sales under Rule 144.

Corporate Governance Specialist

No material governance action; transactions are routine disclosures.

The item records compensation vesting and subsequent disposals by an individual holder rather than corporate changes. The methods shown (vesting, sales) are standard and do not in themselves alter governance or capital structure.

Subsequent documents or transfer-agent reports would show settlement details; the filing itself is an administrative compliance step.

Key Figures

Proposed resale: 1,000 shares Recent sale: 829 shares Recent sale: 341 shares +1 more

4 metrics

Proposed resale 1,000 shares to be sold on 05/11/2026 from Restricted Stock Vesting

Recent sale 829 shares sold on 02/20/2026 for $205,218.95

Recent sale 341 shares sold on 03/12/2026 for $72,705.24

Recent sale 1,400 shares sold on 05/13/2026 for $446,586.00

Key Terms

Form 144, Restricted Stock Vesting, Compensation

3 terms

Form 144 regulatory

"Filer Information | | | 144: Filer Information"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

Restricted Stock Vesting financial

"Common | 05/11/2026 | Restricted Stock Vesting | Issuer"

Restricted stock vesting is the timetable and conditions under which shares granted to employees or insiders become fully owned and can be sold, typically requiring continued work or meeting performance goals. It matters to investors because large blocks of shares can become tradable at once, which can change share supply and price, and because vesting aligns insiders’ incentives with the company’s long‑term performance—think of it like a timed unlock that both rewards and locks in key people.

Compensation financial

"05/11/2026 | Restricted Stock Vesting | Issuer | | | 1000 | 05/11/2026 | Compensation"

FAQ

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

What does MKSI's Form 144 disclose about planned sales?

The filing discloses a proposed resale of 1,000 shares of common stock on 05/11/2026 arising from Restricted Stock Vesting classified as compensation. It notifies market participants of the intended disposition under Rule 144.

Which recent sales by Jacqueline F. Moloney are reported in the MKSI filing?

The filing reports three past dispositions by Jacqueline F. Moloney: 829 shares on 02/20/2026 for $205,218.95, 341 shares on 03/12/2026 for $72,705.24, and 1,400 shares on 05/13/2026 for $446,586.00.

Is the 1,000-share sale part of compensation for MKSI?

Yes. The filing states the 1,000 shares to be sold on 05/11/2026 result from Restricted Stock Vesting and are labeled as Compensation in the excerpt.

Does the Form 144 indicate who will receive proceeds from the 1,000-share sale?

The excerpt ties the 1,000-share transaction to vested restricted stock designated as Compensation; the filing shows the transaction origin but does not state any alternate recipient beyond the issuer/holder relationship in the provided excerpt.

Where were the reported sales executed according to the MKSI filing?

The excerpt lists broker/dealer information for a security entry referencing Fidelity Brokerage Services LLC at an address and shows NASDAQ as the market; individual sale rows list dates, share counts, and dollar amounts.

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

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Accepted by SEC EDGAR 05/14/2026 - 03:44 PM EDT Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001501968
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	MKS INC
SEC File Number	000-23621
Address of Issuer	2 TECH DRIVE ANDOVER MASSACHUSETTS 01810
Phone	978-645-5500
Name of Person for Whose Account the Securities are To Be Sold	Moloney Jacqueline F
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Director

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917	1000	312196.90	67544129	05/14/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	05/11/2026	Restricted Stock Vesting	Issuer			1000	05/11/2026	Compensation

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Jacqueline F. Moloney 2 Tech Drive Andover MA 01810	Common	02/20/2026	829	205218.95
Jacqueline F. Moloney 2 Tech Drive Andover, MA 01810	Common	03/12/2026	341	72705.24
Jacqueline F. Moloney 2 Tech Drive Andover, MA 01810	Common	05/13/2026	1400	446586.00

144: Remarks and Signature

Remarks
Date of Notice	05/14/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Gary Redman, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Jacqueline F. Moloney
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)