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 President & CEO John Tseng-Chung Lee sold 10,000 shares of MKS Inc common stock in an open-market transaction at a price of $315.48 per share. The sale was made under a pre-arranged Rule 10b5-1 trading plan adopted by the executive.
After this transaction, Lee still directly holds about 144,696 shares of MKS Inc common stock, indicating he retains a substantial equity stake in the company despite the sale.
Fidelity Brokerage Services LLC submitted a Form 144 notice to sell 10,000 shares of Common Stock of the issuer listed on NASDAQ. The filing shows a proposed sale date of 05/22/2026 and lists two restricted‑stock vesting lots of 2,659 and 7,341 shares dated 02/15/2021 and 02/15/2026.
MKSI: Notice of proposed sale under Section 144 related to recently vested restricted shares
The filing lists restricted stock vesting entries for 3,143 shares on 02/15/2026 and 5,667 shares on 11/15/2025
The filing shows a broker entry for Fidelity Brokerage Services LLC and a date of 05/22/2026. The document records securities to be sold associated with compensation vesting; timing and exact sale mechanics are not detailed in the excerpt.
MKS Inc director Peter Cannone III reported an open-market sale of 1,350 shares of Common Stock on May 18, 2026 at a price of $303.4001 per share. After this transaction, he directly holds 7,794.039 shares, indicating he retains a meaningful ongoing equity stake in the company.
MKSI notice of proposed sale: 1,350 shares of Common Stock are listed for sale tied to restricted stock vesting on 05/06/2024, with Fidelity Brokerage Services LLC shown as the broker. The filing also records that Peter J. Cannone III sold 1,250 shares on 02/20/2026 for $322,574.50.
MKS INC director Jacqueline F. Moloney reported an open-market sale of 1,000 shares of Common Stock. The shares were sold at an average price of $312.1969 per share. After this transaction, she directly holds 8,775.156 MKS INC shares, indicating she retains a substantial ongoing equity position.
MKSI files a Form 144 notice of proposed sale of common stock. The filing lists 1,000 shares of Common Stock to be sold on 05/11/2026 arising from Restricted Stock Vesting designated as Compensation. The filing also reports recent dispositions by Jacqueline F. Moloney: 829 shares on 02/20/2026, 341 shares on 03/12/2026, and 1,400 shares on 05/13/2026, each with the dollar amounts shown in the filing.
MKS INC director Jacqueline F. Moloney reported an open-market sale of company stock. On May 13, 2026, she sold 1,400 shares of Common Stock at an average price of $318.99 per share.
After this transaction, she directly holds 9,775.156 shares of MKS INC common stock. This filing reflects a director monetizing a portion of her existing equity position while retaining a substantial remaining stake.
MKSI filed a Rule 144 notice reporting proposed resale of 1400 shares of Common Stock tied to a Restricted Stock Vesting event on 05/11/2026. The filing lists prior dispositions in the past three months: 829 shares sold on 02/20/2026 for $205,218.95 and 341 shares sold on 03/12/2026 for $72,705.24. The brokerage intermediary shown is Fidelity Brokerage Services LLC.