MKSI Form 144: 1,350 Common Shares Listed for Sale

MKSI notice of proposed sale: 1,350 shares of Common Stock are listed for sale tied to restricted stock vesting on 05/06/2024, with Fidelity Brokerage Services LLC shown as the broker.

Rhea-AI Filing Summary

MKSI notice of proposed sale: 1,350 shares of Common Stock are listed for sale tied to restricted stock vesting on 05/06/2024, with Fidelity Brokerage Services LLC shown as the broker. The filing also records that Peter J. Cannone III sold 1,250 shares on 02/20/2026 for $322,574.50.

Key Figures

Shares listed for proposed sale: 1,350 shares Insider sale reported: 1,250 shares Proceeds from insider sale: $322,574.50 +1 more

4 metrics

Shares listed for proposed sale 1,350 shares restricted stock vesting on 05/06/2024

Insider sale reported 1,250 shares sold on 02/20/2026 by Peter J. Cannone III

Proceeds from insider sale $322,574.50 consideration received for 1,250 shares on 02/20/2026

Listed market value in broker line $409,590.14 appears on broker row associated with 1,350 shares (05/18/2026)

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 | 05/06/2024 | Restricted Stock Vesting"

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

"1350 | 05/06/2024 | Compensation"

FAQ

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

What does MKSI Form 144 list for sale?

The filing lists 1,350 common shares tied to restricted stock vesting on 05/06/2024. The broker shown is Fidelity Brokerage Services LLC and the transaction is associated with compensation-related vested shares.

Did any insider recently sell MKSI shares?

Yes. The filing records that Peter J. Cannone III sold 1,250 common shares on 02/20/2026 for $322,574.50. That sale is listed separately from the proposed sale of 1,350 shares.

Who is the broker handling the proposed MKSI sale?

The broker shown is Fidelity Brokerage Services LLC, located at 900 Salem Street, Smithfield, RI. The filing pairs this broker with the 1,350 common shares identified for sale.

Are the listed shares from compensation or open-market holdings?

The filing ties the 1,350 shares to restricted stock vesting on 05/06/2024 and labels the source as Compensation, indicating the shares originated from a compensation vesting event.

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

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Accepted by SEC EDGAR 05/18/2026 - 11:33 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	0001276985
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	CANNONE PETER III
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	1350	409590.14	67544129	05/18/2026	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			1350	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
Peter J. Cannone III 2 Tech Drive Andover MA 01810	Common	02/20/2026	1250	322574.50

144: Remarks and Signature

Remarks
Date of Notice	05/18/2026
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/ Jared Cook, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Peter J. Cannone III
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)