MKSI Form 144: 300 Shares Reported for Sale

MKSI submitted a Form 144 notice reporting the proposed sale of 300 shares of Common Stock.

Rhea-AI Filing Summary

MKSI submitted a Form 144 notice reporting the proposed sale of 300 shares of Common Stock. The filing lists a sale method labeled Compensation with an associated date of 05/06/2024. The document also records a 300-share sale by Elizabeth A. Mora on 03/02/2026.

Key Figures

Shares to be sold: 300 shares Sale recorded in past 3 months: 300 shares Filing reference date: 06/01/2026

3 metrics

Shares to be sold 300 shares listed under "Securities To Be Sold", date 05/06/2024

Sale recorded in past 3 months 300 shares "Securities Sold During The Past 3 Months" attributed to Elizabeth A. Mora on 03/02/2026

Filing reference date 06/01/2026 appears in securities information line with NASDAQ

Key Terms

Form 144, Compensation, Securities Sold During The Past 3 Months

3 terms

Form 144 regulatory

"144: Securities To Be Sold"

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.

Compensation financial

"Common | 05/06/2024 | Common | Issuer | | | 300 | 05/06/2024 | Compensation"

Securities Sold During The Past 3 Months regulatory

"144: Securities Sold During The Past 3 Months"

FAQ

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

What does MKSI's Form 144 report?

It reports a proposed sale of 300 shares of Common Stock. The filing shows the sale method as Compensation with a listed date of 05/06/2024, and a separate 300-share sale by Elizabeth A. Mora on 03/02/2026.

Who is listed as the broker or intermediary on the Form 144 for MKSI?

The filing lists Fidelity Brokerage Services LLC at 900 Salem Street, Smithfield, RI. That name appears under securities information alongside the 300-share quantity referenced in the notice.

How many shares are shown as sold during the past three months?

The notice records a 300-share sale in the "Securities Sold During The Past 3 Months" section, attributed to Elizabeth A. Mora with the date 03/02/2026 shown in the excerpt.

What dates appear on the MKSI Form 144 excerpt?

Dates in the excerpt include 05/06/2024 associated with the securities-to-be-sold entry and 03/02/2026 for the recent 300-share sale; the filing also shows 06/01/2026 in the securities information area.

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

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Accepted by SEC EDGAR 06/01/2026 - 11:31 AM 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	0001548935
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	Mora Elizabeth
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	300	95406.00	67544129	06/01/2026	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	Common	Issuer			300	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
Elizabeth A. Mora 2 Tech Drive Andover MA 01810	Common	03/02/2026	300	71832.00

144: Remarks and Signature

Remarks
Date of Notice	06/01/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	02/23/2026
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/ Jennifer Ruchti, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Elizabeth A. Mora
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)