MKSI stock forecast, quote, news & analysis

Key Takeaways

• MKS Instruments shares declined roughly 22.6% over the past 30 days, from about $260.37 to $201.60, deepening a longer multi-month pullback.
• The selloff accelerated in mid-October as a broad semiconductor and AI-infrastructure downturn pressured equipment suppliers across the sector.
• Macroeconomic forces—including AI debt-financing concerns, a 3.7% September CPI reading that revived Federal Reserve rate-hike expectations, and Chinese memory-competition worries—fueled the sector-wide retreat.
• The company announced the sale of its Ophir Optics business to TTM Technologies for $650 million in cash, part of an effort to streamline its portfolio and strengthen its balance sheet.
• Fundamentals remain resilient, with Q2 2026 revenue up 28% year over year, though management flagged near-term gross-margin pressure of 50–80 basis points per quarter.
• MKSI is scheduled to report Q3 2026 results on November 4, 2026, a key near-term catalyst for the shares.
• For deeper detail, explore MKS Instruments' Price Targets, Earnings, and Forecast pages.
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MKS Instruments (MKSI) Company Overview and Market Position

MKS Instruments, Inc., operating as MKS Inc., is a global provider of enabling technologies used to measure, control, and analyze critical manufacturing processes. Founded in 1961 and headquartered in Andover, Massachusetts, the company supplies instruments, subsystems, systems, process control solutions, and specialty chemicals to leading semiconductor, electronics and packaging, and specialty industrial customers. Its portfolio spans vacuum technology, pressure measurement, mass flow and gas delivery, RF plasma power and power-delivery systems, lasers and photonics, precision optics, and specialty electroplating chemicals—capabilities expanded through acquisitions including Newport Corporation and Atotech. Investors follow MKSI closely because its products sit at the heart of advanced semiconductor fabrication and AI-driven packaging demand, giving it direct exposure to wafer fab equipment spending cycles.

MKS Instruments (MKSI) Stock Price Performance: Last 30 Days vs. Quarter

Over the last 30 days, MKSI fell approximately 22.6%, dropping from a closing price of $260.37 on September 22, 2026, to roughly $201.60. The decline was not a straight line: shares rallied into early October, reaching about $281, before a sharp mid-month reversal erased those gains and pushed the stock decisively lower.

The quarterly picture is steeper still. Measured from a closing level near $344.84 on July 22, 2026, MKSI has declined about 41.5%. That extends a drawdown of roughly 55% from the stock's 52-week high of $447.62 reached in late June 2026, reflecting a meaningful de-rating despite continued revenue growth.

What Drove MKSI Stock Price in the Last 30 Days

The sharpest pressure came in mid-October, when a semiconductor and AI-infrastructure selloff swept through the sector. Chip stocks headed for their worst week since July as investors weighed concerns about AI-related debt financing, a hotter-than-expected 3.7% September CPI print that revived expectations for further Federal Reserve tightening, and renewed fears over Chinese memory competition. Peer equipment and component names, including Lam Research and others across the supply chain, sold off in tandem, dragging MKSI lower alongside the broader group.

Company-specific news also shaped sentiment. On October 19, 2026, MKS announced a definitive agreement to sell its Ophir Optics business to TTM Technologies for $650 million in cash, representing an estimated multiple of over 18x projected fiscal 2026 adjusted EBITDA. Management framed the divestiture as a move to capitalize on value created outside its core semiconductor and electronics markets and to further strengthen the balance sheet, which still carries debt from the Atotech acquisition. The transaction is expected to close in the second quarter of 2027.

Lingering valuation and margin concerns from the company's August earnings report also contributed to the stock's vulnerability during the pullback.

What Drove MKSI Stock Performance Over the Last Quarter

The multi-month decline reflects a broader de-rating from an elevated peak rather than a collapse in underlying demand. In its Q2 2026 report, MKS delivered revenue of $1.25 billion, up 28% year over year, with non-GAAP earnings per share of $3.30 beating consensus estimates. Semiconductor revenue rose 28% and electronics and packaging revenue climbed 44%, supported by AI-linked investment. Yet shares fell on the report as elevated expectations collided with management's warning of 50–80 basis points of quarterly gross-margin pressure from higher cost of goods. Against a backdrop of high valuation multiples after a strong AI-driven rally, investors reassessed the stock, and the mid-October sector-wide selloff compounded that re-rating into the current drawdown.

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MKSI Stock Forecast Drivers: What Investors Should Watch Next

The next major catalyst is MKSI's Q3 2026 earnings report, scheduled for November 4, 2026. Analysts expect revenue of roughly $1.35 billion and earnings per share near $3.63, following management's guidance for revenue between $1.31 billion and $1.39 billion. Key areas to monitor include whether semiconductor revenue growth above 50% year over year materializes as guided, the trajectory of gross margins, and commentary on wafer fab equipment spending and AI-linked packaging demand. Investors will also watch for progress on the Ophir Optics divestiture and any use of proceeds to reduce leverage. Broader macro factors—including Federal Reserve policy, AI capital expenditure trends, the memory cycle, and competitive dynamics from Chinese suppliers—remain important swing factors for the entire semiconductor equipment complex.

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