MKSI Form 144: Insider Plans Sale of 5,000 Shares Valued $650K

Form 144 filed for MKSI (MKS Inc) reports a proposed sale of 5,000 common shares through Fidelity Brokerage Services, valued at $650,000, with an approximate sale date of 09/18/2025 on NASDAQ.

Rhea-AI Filing Summary

Form 144 filed for MKSI (MKS Inc) reports a proposed sale of 5,000 common shares through Fidelity Brokerage Services, valued at $650,000, with an approximate sale date of 09/18/2025 on NASDAQ. The filing lists the securities' acquisition history: purchases under the ESPP on 05/28/2021 (89 shares) and 11/30/2021 (67 shares), and restricted stock vesting on 02/15/2022 (1,472 shares) and 02/15/2024 (3,372 shares). It also discloses a prior sale of 2,000 shares on 07/03/2025 with gross proceeds of $210,000. The filer attests there is no undisclosed material adverse information.

Positive

• Clear compliance with Rule 144 disclosure requirements including broker, share counts, and acquisition history
• Specific acquisition dates and nature of payment (ESPP purchases and restricted stock vesting) are provided
• Prior sale disclosed (2,000 shares on 07/03/2025 for $210,000), showing transparency about recent dispositions

Negative

• Insider selling activity with a proposed sale of 5,000 shares valued at $650,000, which may be viewed negatively by some investors
• No 10b5-1 plan date is indicated in the filing, so the sale does not appear tied to a pre-established trading plan

Insights

Securities Analyst

TL;DR: Insider plans a modest sale of 5,000 MKSI shares, previously selling 2,000 in July, disclosed per Rule 144.

The filing documents a proposed Rule 144 sale of 5,000 common shares via Fidelity valued at $650,000, with clear acquisition provenance including ESPP purchases and restricted stock vesting. The recent 2,000-share sale on 07/03/2025 for $210,000 is disclosed, showing prior disposition activity. This is a routine insider liquidity event; the filing contains no forward-looking estimates or operational details about the issuer.

Corporate Governance Expert

TL;DR: Disclosure is compliant and specific, indicating adherence to Rule 144 reporting requirements.

The notice provides required broker, share-count, aggregate value, acquisition dates, and payment nature (cash and compensation). The signer affirms absence of undisclosed material adverse information, and no trading-plan date is indicated. From a governance perspective, the form meets disclosure norms but signals insider selling activity that investors may note.

FAQ

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

The filing discloses a proposed sale of 5,000 common shares via Fidelity on 09/18/2025, with an aggregate market value of $650,000 on NASDAQ.

What prior sales by the seller are reported in the MKSI filing?

The filing reports a prior sale of 2,000 shares on 07/03/2025 with gross proceeds of $210,000.

How were the shares being sold originally acquired?

Shares were acquired via ESPP purchases on 05/28/2021 and 11/30/2021, and via restricted stock vesting on 02/15/2022 and 02/15/2024.

Is there a stated trading plan (Rule 10b5-1) for these sales?

No date of plan adoption or instruction for a Rule 10b5-1 trading plan is provided in the filing.

Who is the broker handling the proposed MKSI sale?

The broker named in the filing is Fidelity Brokerage Services LLC at the listed address in Smithfield, RI.

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Accepted by SEC EDGAR 09/18/2025 - 12:54 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	0001842459
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	Henry David Philip
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

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	5000	650000.00	67159003	09/18/2025	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	05/28/2021	ESPP Purchase	Issuer			89	05/28/2021	Cash
Common	11/30/2021	ESPP Purchase	Issuer			67	11/30/2021	Cash
Common	02/15/2022	Restricted Stock Vesting	Issuer			1472	02/15/2022	Compensation
Common	02/15/2024	Restricted Stock Vesting	Issuer			3372	02/15/2024	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
David Henry 2 Tech Drive Andover MA 01810	Common	07/03/2025	2000	210000.00

144: Remarks and Signature

Remarks
Date of Notice	09/18/2025
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	03/12/2025
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 David Henry
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)