MKS Inc (MKSI) Rule 144 Notice — 838 Shares Planned Sale on NASDAQ

Rhea-AI Filing Summary

Form 144 notice for MKSI (MKS Inc). The filing reports a proposed sale of 838 common shares through Fidelity Brokerage Services LLC with an aggregate market value of $103,912, and an approximate sale date of 09/18/2025 on NASDAQ. The shares were acquired via restricted stock vesting on 02/15/2021 (241 shares) and 02/15/2022 (597 shares) and paid as compensation. The filing also discloses a prior sale by James Schreiner of 957 shares on 07/07/2025 for $98,035.08. The form includes the standard attestation that the seller does not possess undisclosed material adverse information about the issuer.

Positive

• Regulatory compliance: The filing discloses acquisition dates, nature of acquisition, broker, planned sale date, and market value as required by Rule 144.
• Transparency on provenance: Shares to be sold are identified as compensation from restricted stock vesting with specific acquisition dates.

Negative

• Insider selling activity: The filing shows planned disposal of 838 shares and a recent sale of 957 shares, which investors may interpret as insider liquidity.
• Limited issuer context: The form provides no operational or financial information about the issuer and no disclosure of any 10b5-1 plan adoption date.

Insights

Securities Analyst

TL;DR: Routine insider sale notice; confirms planned sale of 838 shares and prior sale of 957 shares.

The filing is a standard Rule 144 notice showing an insider or related person intends to sell 838 common shares worth $103,912 on or about 09/18/2025 via Fidelity. The shares originated from restricted stock vesting in 2021 and 2022 and were compensation, which is consistent with typical post-vesting dispositions. The disclosure of a recent sale of 957 shares on 07/07/2025 for $98,035.08 provides additional context on recent insider activity. There are no financial performance metrics or new corporate actions disclosed.

Corporate Governance Expert

TL;DR: Compliance filing demonstrates disclosure of insider transactions but contains limited issuer context.

The submission meets Rule 144 reporting requirements by documenting acquisition dates, nature of acquisition, and planned sale details including broker and exchange. It includes the required representation regarding material non-public information. The filing lacks additional issuer-specific details such as the identity of the person for whose account the sale is to be made (beyond past-seller information) and contains no commentary on trading plans or 10b5-1 adoption 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
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

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

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	838	103912.00	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	02/15/2021	Restricted Stock Vesting	Issuer			241	02/15/2021	Compensation
Common	02/15/2022	Restricted Stock Vesting	Issuer			597	02/15/2022	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
James Schreiner 2 Tech Drive Andover MA 01810	Common	07/07/2025	957	98035.08

144: Remarks and Signature

Remarks

Date of Notice

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

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

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does the MKSI Form 144 report?

The filing reports a proposed sale of 838 common shares on 09/18/2025 via Fidelity with an aggregate market value of $103,912.

How were the shares to be sold acquired?

The shares were acquired as restricted stock vesting: 241 shares on 02/15/2021 and 597 shares on 02/15/2022, recorded as compensation.

Did the filing disclose recent sales by the same person?

Yes. The filing shows a prior sale by James Schreiner of 957 shares on 07/07/2025 for $98,035.08.

On which exchange will the shares be sold?

The planned sale is reported to occur on NASDAQ through Fidelity Brokerage Services LLC.

Does the filing state whether a 10b5-1 trading plan was used?

No. The filing includes the standard notice and a field for plan adoption date, but no 10b5-1 plan adoption date or instruction date is provided.