Welcome to our dedicated page for MKS SEC filings (Ticker: MKSI), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
MKS Inc. SEC filings document operating results, capital-structure activity and governance matters for a Nasdaq-listed provider of technology solutions for semiconductor manufacturing, electronics and packaging, and specialty industrial applications. Form 8-K reports disclose results of operations and financial condition, financial guidance updates, material definitive agreements, debt refinancing activity, senior notes, credit facilities and registered common stock information.
The company’s proxy materials cover board and shareholder voting matters, executive compensation and related governance disclosures. Other current reports address officer transitions and compensation arrangements, providing formal records of management, governance and financing developments tied to MKS’s public-company structure.
MKS Inc. furnished an 8-K to announce financial results for the quarter ended September 30, 2025. The company made the news available through a press release, which is attached as Exhibit 99.1.
The company specified that the information in this report and its exhibit is furnished, not filed, under the Exchange Act. As a result, it is not subject to Section 18 liabilities and will only be incorporated by reference in other filings if specifically referenced. MKS Inc.’s common stock trades on the Nasdaq Global Select Market under the symbol MKSI.
MKS Inc. (MKSI) reported insider equity activity. On 10/31/2025, the company’s EVP, GC & Secretary converted restricted stock units into common stock, acquiring 158 shares, 52 shares, 82 shares, 144 shares, and 341 shares through code “M” transactions, each RSU representing one share.
To cover FICA taxes, 777 shares were withheld in a code “F” transaction at $143.71 per share. Following these transactions, the reporting person directly beneficially owned 51,074.509 shares of common stock. Derivative holdings listed after the activity show 16,998.737 RSUs remaining.
MKS Inc. (MKSI) reported insider activity by its President & CEO and Director on 10/31/2025. The filing shows RSU settlements and a related tax transaction. The executive converted RSUs into common stock under code M, acquiring 352 shares and 1,651 shares. To cover FICA taxes, 2,003 shares were disposed under code F at $143.71 per share.
Following these transactions, the executive directly owned 147,269.5227 shares. Each RSU represents the right to receive one common share. The company notes that portions of the 2024 and 2025 RSU awards were accelerated to satisfy FICA taxes.
MKS Inc. (MKSI) reported an insider transaction. The EVP & COO sold 711 shares of common stock at $138.68 on 10/22/2025 under a Rule 10b5-1 trading plan adopted on March 12, 2025. Following the sale, the reporting person beneficially owned 22,534.694 shares, held directly.
MKS Inc. (MKSI) insider transaction: Director Jacqueline F. Moloney reported a sale of 300 shares of MKS common stock on 10/01/2025 at a price of $122.14 per share under a Rule 10b5-1 trading plan adopted 09/10/2024. After the reported sale the filing lists 11,562.304 shares beneficially owned by the reporting person, shown as direct ownership. The Form 4 was executed by an attorney-in-fact on 10/02/2025. The filing discloses this single non-derivative disposition and provides no other transactions or derivative holdings.
Form 144 notice filed for MKSI insider sale. The filer plans to sell 300 shares of common stock through Fidelity Brokerage Services on NASDAQ with an aggregate market value of $36,642 and an approximate sale date of 10/01/2025. The 300 shares were acquired on 05/06/2024 through restricted stock vesting as compensation and were paid for on 05/06/2024. The filing also discloses a sale by Jacqueline Moloney of 300 shares on 08/01/2025 for gross proceeds of $27,630. By signing, the seller represents they are not aware of any undisclosed material adverse information about the issuer.
James Alan Schreiner, Executive Vice President & Chief Operating Officer of MKS Inc. (MKSI), reported a sale of 838 shares of MKS common stock on 09/18/2025 at a price of $124 per share. The filing states the transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 12, 2025. After the reported sale, the reporting person beneficially owned 23,245.694 shares, held directly. The Form 4 was signed by an attorney-in-fact on 09/19/2025. The document lists the reporting person’s address as C/O MKS Inc., 2 Tech Drive, Andover, MA 01810.
Henry David Philip, Executive VP & GM at MKS Inc., reported a sale of 5,000 shares of MKS Inc. common stock on 09/18/2025 at a price of $130 per share, leaving beneficial ownership of 15,571.18 shares. The filing states the sale was made under a Rule 10b5-1 trading plan adopted March 12, 2025. The Form 4 was signed by an attorney-in-fact on 09/19/2025. No derivative transactions or other securities classes are reported in this filing.
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.
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.