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.
Pressure gauges, vacuum subsystems and photonics lasers may power the world’s fabs, but they also make MKS Instruments’ disclosures unusually dense. Sorting through multi-segment revenue tables, acquisition accounting and patent roll-forwards across hundreds of pages can feel overwhelming when all you want is a clear view of semiconductor exposure or cash-flow trends.
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Whether youre understanding MKS Instruments SEC documents with AI or need MKS Instruments 8-K material events explained, every filing is indexed, searchable and updated continuously. This page is your single stop for MKS Instruments SEC filings explained simply, helping you act on insights before the market reacts.
MKS Inc. executive reports RSU vesting and related share withholding. The company’s EVP & CFO reported the vesting of 8,295 restricted stock units on common stock of MKS Inc. on 11/17/2025, each RSU representing the right to receive one share of common stock.
Of these shares, 2,628 were withheld by MKS Inc. at a price of $142.74 per share to cover tax withholding obligations, leaving 5,667 shares of common stock beneficially owned directly after the transaction. Following this activity, the executive also reports 16,402.394 restricted stock units beneficially owned, which continue to represent future rights to receive common shares as they vest in scheduled installments.
MKS Inc. (MKSI) reported Q3 2025 results showing higher sales and improved profitability. Total revenue was $988 million (products $860 million; services $128 million), up from $896 million a year ago. Gross profit reached $461 million. Operating income was $138 million, and net income was $74 million, or $1.10 diluted EPS.
End-market mix was balanced: Semiconductor $415 million, Electronics and Packaging $289 million, and Specialty Industrial $284 million. Year to date, revenue totaled $2.898 billion with net income of $188 million. Operating cash flow was $503 million for the nine months, funding capex of $98 million and debt reduction. Cash and equivalents were $697 million. Long-term debt, net, declined to $4.253 billion from $4.488 billion, aided by multiple voluntary prepayments, while Q3 interest expense fell to $53 million from $64 million.
The company recorded $44 million related to the AMIC within other current assets, reducing depreciation over the life of qualifying assets. Stockholders’ equity increased to $2.600 billion, with accumulated other comprehensive loss improving to $(108) million.
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.
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