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. reported strong first-quarter 2026 results, with revenue of $1,078 million, up from $936 million a year earlier, and at the high end of guidance. GAAP net income was $84 million, or $1.18 per diluted share, while Non-GAAP net earnings were $157 million, or $2.30 per diluted share, both above the high end of guidance.
Segment revenue was $466 million in Semiconductor, $321 million in Electronics & Packaging and $291 million in Specialty Industrial. Adjusted EBITDA reached $277 million with a 25.7% margin, and free cash flow was $29 million.
MKS refinanced its capital structure by issuing €1.0 billion of 4.25% senior notes due 2034, using those proceeds and term-loan refinancings to prepay about $1.3 billion of existing term loans, and upsized its revolving credit facility to $1.0 billion. It also increased its dividend from $0.22 to $0.25 per share. The company guided second-quarter 2026 revenue to $1,200 million ± $40 million, Non-GAAP EPS to $2.90 ± $0.30, and Adjusted EBITDA to $328 million ± $26 million.
MKS Inc ownership filing: FMR LLC reports beneficial ownership of 2,243,989.13 shares of Common Stock, representing 3.3% of the class as of 03/31/2026. The filer reports sole dispositive power for 2,243,989.13 shares and sole voting power for 2,185,157.72 shares.
The amendment names Abigail P. Johnson in a related capacity and references an Exhibit 99 agreement and an incorporated power of attorney effective April 13, 2026.
MKS Inc ownership filing shows Vanguard Capital Management beneficially owns 3,528,836 shares of common stock, representing 5.24% of the class as reported 03/31/2026. The filer reports sole voting power for 514,635 shares and sole dispositive power for 3,528,836 shares.
The disclosure states ownership includes securities held for Vanguard funds and client accounts over which affiliated Vanguard entities exercise voting or dispositive power. The filing is signed by Vanguard’s Head of Global Fund Administration on 04/30/2026.
MKS Inc ownership disclosure: Vanguard Portfolio Management reports beneficial ownership of 3,700,062 shares of Common Stock, representing 5.49% of the class as reported. The filing states Vanguard exercises sole dispositive power over these shares and includes holdings managed for Vanguard funds and clients.
The filing attributes 14,569 shares of sole voting power to Vanguard Portfolio Management and clarifies the holdings reflect securities held by Vanguard funds and other managed accounts; timing and trading intent are not stated.
MKS Inc EVP & GM, PSD John Edward Williams reported routine equity compensation activity involving restricted stock units (RSUs). On April 17, 2026, RSUs representing 1,740.714 shares of common stock were converted into common shares, reflecting the vesting of previously granted awards.
To cover tax withholding obligations from this RSU vesting, 825.969 common shares were withheld by MKS Inc, which the company notes does not represent a discretionary trade by Williams. Following these transactions, he directly holds 4,554.844 shares of MKS Inc common stock.
MKS Inc. senior vice president and chief accounting officer Michelle M. McCarthy reported equity compensation activity involving restricted stock units (RSUs) and related common stock on April 15, 2026. She received a grant of 1,672.862 RSUs, each representing a contingent right to one share of MKS common stock, which will vest in three equal annual installments beginning on April 15, 2027.
On the same date, RSUs in amounts of 968, 1,107, and 1,736 units were exercised or converted into the same number of common shares as part of earlier awards that vest in three annual installments beginning on April 15, 2025 and April 15, 2026. To cover tax withholding obligations triggered by these vestings, 1,375.451 common shares were withheld by MKS Inc. at a price of $274.15 per share, which the filing notes was not a discretionary trade. Following these transactions, McCarthy directly held 2,435.549 shares of common stock and 7,388.160 RSUs.
MKS Inc. reported that Executive Vice President, General Counsel and Secretary Kathleen F. Burke plans to retire from her officer roles effective June 1, 2026. She notified the company on March 31, 2026 and will continue as a special advisor until July 1, 2026 to support the transition.
MKS Inc. is asking shareholders at the 2026 Annual Meeting to elect three directors, expand its equity incentive capacity, and approve several key governance and compensation items. The meeting will be held on May 11, 2026 at the company’s Andover, Massachusetts headquarters.
A central proposal is approval of the Amended and Restated 2022 Stock Incentive Plan, which would increase the share reserve by 6,200,000 shares of common stock, raising the pool from 6,200,274 to 12,400,274 shares. The plan continues to emphasize full-value RSU awards, a fungible share pool, no option/SAR repricing without shareholder approval, and a $750,000 annual cap on non-employee director cash and equity compensation.
Shareholders will also vote on an advisory say-on-pay resolution, ratification of PricewaterhouseCoopers as auditor for 2026, and two competing proposals to lower the ownership threshold to call a special meeting—one company proposal to reduce it from 40% to 25% and a shareholder proposal to reduce it to 10%. The board recommends voting for the director slate, the amended equity plan, say-on-pay, auditor ratification, and the 25% threshold proposal, and against the 10% threshold proposal.
The Vanguard Group filed an amendment to its Schedule 13G/A for MKS Inc reporting 0 shares beneficially owned and 0% of the class. The filing explains an internal realignment completed on January 12, 2026 that caused certain Vanguard subsidiaries or business divisions to report ownership separately under SEC Release No. 34-39538.
The amendment states Vanguard no longer is deemed to beneficially own securities held by those subsidiaries or divisions and lists its reporting address and signing officer.