MKSI insider files to sell 341 shares

Registrant: A Form 144 was filed disclosing a proposed sale of 341 shares of common stock.

Rhea-AI Filing Summary

Registrant: A Form 144 was filed disclosing a proposed sale of 341 shares of common stock. The filing lists $72,705.24 as the aggregate amount and identifies Fidelity Brokerage Services LLC as the broker with a filing date of 03/12/2026.

The shares are described as issued upon restricted stock vesting on 05/06/2024 under a compensation arrangement. The filing also reports that Jacqueline F. Moloney sold 829 shares on 02/20/2026 for $205,218.95.

Insights

Corporate Governance Analyst

Routine director/insider resale of vested compensation.

This Form 144 documents a proposed sale of 341 shares tied to restricted stock vesting on 05/06/2024, with an aggregate value shown as $72,705.24. The broker listed is Fidelity Brokerage Services LLC.

Prior short‑term activity is disclosed: 829 shares were sold on 02/20/2026 for $205,218.95. These entries represent reported insider dispositions; timing and execution details beyond the broker and aggregate amounts are not provided in the excerpt.

FAQ

What does MKSI's Form 144 disclose about the proposed sale?

The Form 144 discloses a proposed sale of 341 shares with an aggregate $72,705.24, brokered by Fidelity Brokerage Services LLC and filed on 03/12/2026.

Why are the 341 shares eligible for sale according to the filing?

The 341 shares are described as resulting from restricted stock vesting dated 05/06/2024 and are classified under the filing as compensation‑issued securities.

Has the reporting person recently sold other MKSI shares?

Yes. The filing reports that Jacqueline F. Moloney sold 829 shares on 02/20/2026 for $205,218.95, listed in the "Securities Sold During The Past 3 Months" section.

Who is the broker listed for the proposed MKSI sale?

The broker named in the filing is Fidelity Brokerage Services LLC, associated with the proposed sale of 341 shares and the aggregate amount of $72,705.24.

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Accepted by SEC EDGAR 03/12/2026 - 02:31 PM 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	341	72705.24	67248357	03/12/2026	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	05/06/2024	Restricted Stock Vesting	Issuer			341	05/06/2024	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

144: Remarks and Signature

Remarks
Date of Notice	03/12/2026
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/ Daniel Tucci, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Jacqueline Moloney
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)