MKS director plans $75K sale of 300 shares

Rhea-AI Filing Summary

MKS INC (MKSI) received a notice under Rule 144 that director Elizabeth A. Mora, through Fidelity Brokerage Services LLC, plans to sell 300 shares of common stock on NASDAQ. The shares relate to restricted stock vesting designated as compensation, and Mora has sold 300 shares in the prior three months.

Key Figures

Shares to be sold: 300 shares of common stock Aggregate value of planned sale: $75,288.00 Shares sold in past 3 months: 300 shares of common stock +1 more

4 metrics

Shares to be sold 300 shares of common stock Planned Rule 144 sale through Fidelity Brokerage Services LLC

Aggregate value of planned sale $75,288.00 Listed for the 300 MKSI common shares to be sold

Shares sold in past 3 months 300 shares of common stock Reported prior sale by Elizabeth A. Mora

Aggregate value of past 3-month sales $95,406.00 Value of 300 MKSI common shares sold during the past three months

Key Terms

Rule 144, Restricted Stock Vesting, attorney-in-fact, Compensation

4 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

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.

attorney-in-fact regulatory

"as attorney-in-fact for Elizabeth A. Mora"

An attorney-in-fact is the person or entity given legal authority through a power of attorney to act on behalf of another for specific tasks, such as signing documents, voting shares, or handling transactions. For investors, this matters because it lets a trusted representative make timely decisions or complete paperwork when the owner cannot, much like handing keys to someone to run errands on your behalf—so checks on scope and limits of that authority are important.

Compensation financial

"300 | 05/11/2026 | Compensation"

FAQ

What does the Form 144 filing disclose for MKSI?

It discloses that Elizabeth A. Mora, a director of MKS INC, has filed a notice of intent under Rule 144 to sell 300 shares of MKSI common stock through Fidelity Brokerage Services LLC on NASDAQ.

How many MKSI shares are proposed to be sold under this Rule 144 notice?

The notice states that 300 shares of MKS INC common stock are to be sold through Fidelity Brokerage Services LLC in a Rule 144 transaction.

What is the approximate value of the MKSI shares to be sold?

The filing lists an aggregate value of $75,288.00 for the 300 shares of MKS INC common stock covered by the planned Rule 144 sale.

What prior MKSI stock sales by Elizabeth A. Mora are disclosed?

The filing reports that 300 shares of MKS INC common stock were sold during the past three months, for an aggregate amount of $95,406.00.

What is the source of the MKSI shares to be sold under this Form 144?

The shares are described as Restricted Stock Vesting from the issuer, categorized as Compensation in the Rule 144 disclosure.

Who is executing the Rule 144 sale for MKSI shares?

The broker listed is Fidelity Brokerage Services LLC, which is acting as broker and attorney-in-fact for Elizabeth A. Mora in connection with the planned Rule 144 sale of MKSI shares.

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

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Available on EDGAR 09/01/2026 - 11:48 AM Accepted by SEC EDGAR 09/01/2026 - 11:47 AM 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	75288.00	67617558	09/01/2026	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	05/11/2026	Restricted Stock Vesting	Issuer			300	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
Elizabeth A. Mora 2 Tech Drive Andover MA 01810	Common	06/01/2026	300	95406.00

144: Remarks and Signature

Remarks
Date of Notice	09/01/2026
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)