Archived explainer. For the current picture see today's MKSI page.
MKS INC (MKSI) is down -11.29% in the latest session. Our newswire has captured 2 stories on MKSI across 2 sources in the last 36 hours, with AI sentiment reading bullish (avg 68/100).
MKS Inc (MKSI) fell 11.29% to $280.12 in morning trading on Monday. The stock opened at a 4.3% discount to the prior close and continued to decline throughout the session. The move reflects a combination of bearish sentiment from recent insider selling and a gap down in price following a volatile 52-week range. The stock is currently trading below its 50-day and 200-day moving averages.
MKS Inc opened at $302.00, a significant drop from the previous close of $315.70. The stock quickly moved lower, hitting a session low of $277.01 before stabilizing slightly. The decline comes after a series of recent insider transactions, with executives including EVP and COO James Alan Schreiner and SVP Michelle M McCarthy selling shares over the past two weeks. These transactions, totaling $21.8 million in the last 90 days, have raised concerns among investors. Meanwhile, the stock has been trading within a wide 52-week range of $88.49 to $447.62, indicating significant volatility.
The intraday session shows a volume of 0.4 million shares, which is 0.3 times the 3-month average. The stock opened at $302.00 and has since fallen to $279.52. MKSI has a market cap of $22.2 billion and a P/E ratio of 66.1, indicating a high valuation. The company has a beta of 1.93, suggesting it is more volatile than the broader market. Despite recent analyst upgrades and price targets as high as $600, the stock has been unable to hold above key moving averages, and the recent insider selling has contributed to the downward pressure.
MKS Inc is scheduled to report Q2 earnings on August 5. Investors will be watching for signs of continued strength in semiconductor subsystem demand and whether the company can justify its premium valuation. Coverage breadth and any further analyst action will also be important to monitor in the coming weeks.
AI-assisted analysis composed exclusively from headlines and data on the Top Tier newswire. Not financial advice.
WS Amati Global Innovation Fund, managed by a UK-based equity management firm from AMAti Global Investors, released its second quarter 2026 investor letter. A copy of the letter is available to download here. Financial market performance in the second quarter was dominated by geopolitical conflict and enthusiasm for AI. Significant investments across all elements of […]
Buy-rated MKS (MKSI): strong semiconductor subsystem demand, 25% discount to peers, and Q2 Aug 5 earnings preview with risk-reward setup—read now.
More on MKSI: full news and sentiment history. Sentiment scores are AI-derived research signals, not financial advice.
Earlier MKSI move explainers: 2026-07-28 · 2026-07-27