Affiliate sales reported for MKSI (NASDAQ: MKSI): 6,019 shares, $1.37M proceeds

Rhea-AI Filing Summary

MKSI filed notices under Rule 144 reporting proposed or recent sales of Common Stock by an affiliate. The filing lists two completed sales in the past three months: 02/20/2026 (1,452 shares, $359,623.31) and 03/06/2026 (4,567 shares, $1,007,317.82). The filing also itemizes previously vested restricted shares and an ESPP purchase by the reporting affiliate with dated vesting counts.

Insights

Securities Compliance Attorney

Rule 144 notices record recent affiliate sales and vesting events.

The filing lists two affiliate sales totaling 6,019 shares on 02/20/2026 and 03/06/2026 with stated gross proceeds. It also enumerates multiple restricted stock vesting events and an ESPP purchase by the affiliate with share counts and vesting dates.

These notices are procedural disclosures under Rule 144; cash‑flow treatment to the issuer is not stated. Subsequent filings may show additional dispositions or confirm whether proposed sales occurred under brokered or other methods.

Key Figures

Sale on 02/20/2026: 1,452 shares Proceeds on 02/20/2026: $359,623.31 Sale on 03/06/2026: 4,567 shares +3 more

6 metrics

Sale on 02/20/2026 1,452 shares sold by Eric Taranto on <date>02/20/2026</date>

Proceeds on 02/20/2026 <money>$359,623.31</money> gross proceeds reported for 1,452 shares

Sale on 03/06/2026 4,567 shares sold by Eric Taranto on <date>03/06/2026</date>

Proceeds on 03/06/2026 <money>$1,007,317.82</money> gross proceeds reported for 4,567 shares

Restricted shares vested (example) 919 shares Restricted Stock Vesting on <date>02/15/2024</date>

ESPP purchase 101 shares ESPP Purchase on <date>05/31/2022</date>

Key Terms

Rule 144, Restricted Stock Vesting, ESPP Purchase

3 terms

Rule 144 regulatory

"Securities Sold During The Past 3 Months"

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

"Restricted Stock Vesting | Issuer | 02/13/2020"

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.

ESPP Purchase financial

"ESPP Purchase | Issuer | 05/31/2022"

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	2849	911327.73	67544129	05/11/2026	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	02/13/2020	Restricted Stock Vesting	Issuer			613	02/13/2020	Compensation
Common	04/15/2022	Restricted Stock Vesting	Issuer			556	04/15/2022	Compensation
Common	04/17/2022	Restricted Stock Vesting	Issuer			660	04/17/2022	Compensation
Common	05/31/2022	ESPP Purchase	Issuer			101	05/31/2022	Cash
Common	02/15/2024	Restricted Stock Vesting	Issuer			919	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
Eric Taranto 2 Tech Drive Andover MA 01810	Common	02/20/2026	1452	359623.31
Eric Taranto 2 Tech Drive Andover MA 01810	Common	03/06/2026	4567	1007317.82

144: Remarks and Signature

Remarks

Date of Notice

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 did MKSI's Form 144 report?

The filing reports proposed or completed affiliate sales of Common Stock and lists vesting events. It records two sales: 1,452 shares on 02/20/2026 for $359,623.31 and 4,567 shares on 03/06/2026 for $1,007,317.82.

Who is the reported seller in the MKSI Form 144?

The filing identifies an affiliate, with specific sales by Eric Taranto. It lists his address and the two sale dates with share counts and proceeds, and also shows prior restricted stock vesting and an ESPP purchase attributed to the affiliate.

Do the Form 144 entries change MKSI's outstanding shares?

The filing lists vesting counts and sales amounts but does not state shares outstanding. The document enumerates vested restricted shares and ESPP purchases as dated items; it does not report an updated outstanding share total in the provided excerpt.

What methods were used for the reported MKSI sales?

The excerpt provides sale dates, share counts, and gross proceeds but does not specify the method of sale (brokered trades, block trades, or private placements). The filing does not state the distribution method in the provided content.