MKS Inc. SEC Filings

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.

Elizabeth Mora, a director of MKS Inc. (MKSI), reported a sale of 300 shares of common stock on 09/02/2025 at a price of $99.85 per share. The Form 4 shows the transaction was executed pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 19, 2025. After the reported sale, the filing lists 19,263.394 shares beneficially owned by the reporting person. The Form 4 was signed by an attorney-in-fact on 09/03/2025. The filing identifies the reporter as a director and indicates this is a single-person Form 4 filing.

MKS Inc. officer or insider intends to sell 300 shares of common stock through Fidelity Brokerage Services on NASDAQ, with an approximate aggregate market value of $29,955 based on the filing. The securities were acquired on 05/06/2024 through restricted stock vesting and were issued as compensation. The filing lists an approximate sale date of 09/02/2025 and shows 67,159,003 shares outstanding for the issuer. The notice discloses a related sale by the same person of 300 shares on 06/02/2025 for $24,534. The filer affirms they are not aware of undisclosed material adverse information regarding the issuer.

James Alan Schreiner, EVP & COO of MKS Inc. (MKSI), reported transactions dated 08/18/2025 related to vested restricted stock units (RSUs) and a related share withholding sale to cover taxes. The filing shows 2,640.942 RSUs treated as acquired (vesting) and 1,249 shares disposed of in a withholding sale at $100.22 per share to satisfy tax obligations. The filing states each RSU converts to one common share. The reporting person’s post-transaction beneficial ownership is reported as 24,083.694 shares for non-derivative common stock and 13,018.14 derivative securities beneficially owned following the transactions. The report was signed by an attorney-in-fact on behalf of the reporting person.

John Edward Williams, EVP & GM, PSD of MKS Inc. (MKSI), reported restricted stock units (RSUs) vesting on 08/15/2025. A grant of 947.285 RSUs vested (each RSU converts to one share), which increased the reporting person’s beneficial ownership of common stock to 7,343.75 shares on a direct basis. The company withheld 308 shares to satisfy tax withholding obligations at a price shown of $104.73; the withholding was not a discretionary sale by the reporting person. The transactions were reported on Form 4 and executed under codes indicating vesting and tax-withholding treatment.

T. Rowe Price Associates, Inc. filed Amendment No. 4 to a Schedule 13G reporting ownership of 4,129,128 shares of MKS Inc. common stock (CUSIP 55306N104), which the filing states represents 6.2% of the class. The filer reports sole voting power over 4,106,485 shares and sole dispositive power over 4,129,128 shares.

The statement includes the filer’s certification that the securities were acquired and are held in the ordinary course of business and were not acquired to change or influence control of the issuer. The filing lists the issuer address as 2 Tech Drive, Suite 201, Andover, MA, and shows the date of the triggering event as 06/30/2025 with the signature dated 08/14/2025.

Filing type: Amendment (Schedule 13G/A) reporting beneficial ownership of MKS Inc (CUSIP 55306N104).

Key facts:

• Reporting person: Victory Capital Management, Inc. (Type: IA; citizenship: New York).
• Aggregate beneficially owned: 3,787,201 shares, representing 5.64% of MKS Inc common stock (event date: 06/30/2025).
• Sole voting power: 3,711,418 shares; shared voting power: 0.
• Sole dispositive power: 3,787,201 shares; shared dispositive power: 0.
• Issuer address: 2 Tech Dr, Andover, MA 01810-2434.
• Signature: Barry Garrett, Chief Compliance Officer (date: 08/08/2025); comment: Amendment to update Sole Voting Power.

Certifications: The filer attests the securities are held in the ordinary course of business and not to influence control of the issuer.

Victory Capital Management, Inc. filed a Schedule 13G indicating a passive ownership stake in MKS Inc. (MKSI). As of 30 Jun 2025 the investment adviser beneficially owned 3,787,201 common shares, representing 5.64 % of the outstanding class. The firm holds sole voting power over 3,787,201 shares (3,711,418 specifically listed for sole vote) and sole dispositive power over the full position, with no shared voting or dispositive authority.

Key points:

• Filing trigger: first time (or updated) crossing the 5 % threshold, requiring disclosure under Exchange Act Rule 13d-1(b).
• Reporting person classification: Investment Adviser (IA) headquartered in New York; business address in San Antonio, TX.
• Certification states the shares were acquired in the ordinary course and not for the purpose of influencing control.
• Signature by Chief Compliance Officer Barry Garrett on 08 Aug 2025.

Q2-25 highlights (MKSI 10-Q): Revenue climbed 9.7% YoY to $973 m as product sales grew 10% and service 7%. Net income surged to $62 m ($0.92 EPS) from $23 m, lifting 1H profit to $114 m. Gross margin slipped 60 bps to 46.6% on mix, but operating margin improved 40 bps to 13.9% on disciplined opex. End-market mix: Semiconductor +17%, Electronics & Packaging +16%, Specialty Industrial –5%.

Cash & balance sheet: Operating cash flow jumped 62% to $306 m, funding $47 m capex, $45 m buybacks and $30 m dividends. Cash ended at $674 m (-$40 m YTD). Debt fell $131 m to $4.36 b after two $100 m voluntary prepayments and January repricing; weighted-avg rate 5.9%. Interest expense dropped 30% to $55 m. Equity rose to $2.55 b, OCI loss narrowed to $84 m. Company remains covenant-compliant; no guidance provided.