Fidelity files Form 144 to sell 10,000 MKSI shares

Fidelity Brokerage Services LLC submitted a Form 144 notice to sell 10,000 shares of Common Stock of the issuer listed on NASDAQ.

Rhea-AI Filing Summary

Fidelity Brokerage Services LLC submitted a Form 144 notice to sell 10,000 shares of Common Stock of the issuer listed on NASDAQ. The filing shows a proposed sale date of 05/22/2026 and lists two restricted‑stock vesting lots of 2,659 and 7,341 shares dated 02/15/2021 and 02/15/2026.

Insights

Securities Counsel

Form 144 filed for an affiliate sale of 10,000 shares on NASDAQ.

The notice lists a proposed brokered sale by Fidelity Brokerage Services LLC for 10,000 shares with a filing date of 05/22/2026. Two restricted‑stock vesting lots (2,659 and 7,341 shares) are recorded, matching the 10,000 total.

Regulatory context: a Form 144 is a required notice for certain affiliate sales; cash‑flow treatment and final sale mechanics are not stated in the excerpt. Subsequent trade execution and Rule 144 compliance must be confirmed in transaction records.

Key Figures

Proposed shares to sell: 10,000 shares Reported dollar figure: $3,154,800.00 Shares outstanding (listed): 67,544,129 +2 more

5 metrics

Proposed shares to sell 10,000 shares Form 144 notice dated <date>05/22/2026</date>

Reported dollar figure <money>$3,154,800.00</money> Listed on the filing excerpt (context of the amount not specified)

Shares outstanding (listed) 67,544,129 Number appearing in the excerpt (labeling in excerpt not explicit)

Vesting lot 1 2,659 shares Restricted Stock Vesting dated <date>02/15/2021</date>

Vesting lot 2 7,341 shares Restricted Stock Vesting dated <date>02/15/2026</date>

Key Terms

Form 144, Restricted Stock Vesting, Fidelity Brokerage Services LLC

3 terms

Form 144 regulatory

"submitted a <b>Form 144</b> notice to sell 10,000 shares"

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

"Restricted Stock Vesting | Issuer | 2,659 | 02/15/2021"

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.

Fidelity Brokerage Services LLC other

"Common | Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917"

FAQ

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

What does MKSI's Form 144 filed by Fidelity show?

It reports a proposed sale of 10,000 shares of MKSI common stock with a filing date of 05/22/2026. The filing lists two restricted‑stock vesting lots of 2,659 and 7,341 shares dated 02/15/2021 and 02/15/2026.

Who is the filing agent on the MKSI Form 144?

The filing names Fidelity Brokerage Services LLC as the broker/dealer associated with the proposed sale. The excerpt shows the broker address and identifies the transaction as a Form 144 notice dated 05/22/2026.

How many restricted shares are listed in the MKSI notice?

The notice lists two restricted‑stock vesting lots totaling 10,000 shares: 2,659 shares vesting on 02/15/2021 and 7,341 shares vesting on 02/15/2026, which together equal the 10,000 proposed sale amount.

Is the sale price or proceeds shown in the MKSI excerpt?

A dollar figure of $3,154,800.00 appears in the excerpt but the filing does not state explicit proceeds allocation or price per share within the provided text. Final execution details are not included in the excerpt.

Does the Form 144 indicate market venue for MKSI shares?

Yes; the excerpt identifies the trading venue as NASDAQ. The filing lists proposed sale mechanics via the named broker but does not specify exact execution methods in the provided excerpt.

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

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Accepted by SEC EDGAR 05/22/2026 - 12:53 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	0001414656
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	Lee John Tseng-Chung
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	Officer
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	10000	3154800.00	67544129	05/22/2026	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	02/15/2021	Restricted Stock Vesting	Issuer			2659	02/15/2021	Compensation
Common	02/15/2026	Restricted Stock Vesting	Issuer			7341	02/15/2026	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

Nothing to Report

144: Remarks and Signature

Remarks
Date of Notice	05/22/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	02/20/2026
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 Tseng-Chung Lee
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)