Why MKS Inc. (MKSI) Stock Is Down Today

2026-11-13

Investivoq PriceTracker

MKS Inc. (MKSI) is down 4.5% today. Here is some analysis on what might have caused this price movement.

Analysis: The most likely driver appears to be a mix of semiconductor-sector weakness and post-earnings repositioning rather than a fresh negative company announcement. MKS recently posted strong third-quarter results and issued fourth-quarter guidance above prior levels, but investors may be focusing on softer sentiment across chip-related names and on analyst price-target resets after the report.

Details:

MKS reported record third-quarter 2026 revenue of $1.413 billion and non-GAAP earnings of $4.18 per diluted share, both above the high end of its guidance.

The company guided for fourth-quarter 2026 revenue of about $1.49 billion, plus or minus $40 million, and non-GAAP earnings per diluted share of about $5.00, plus or minus $0.38.

MKS also disclosed a new $500 million share repurchase program and said it made a voluntary $100 million principal prepayment on its USD term loan B in November.

Even with those positives, sentiment may be getting pressured by broader volatility in semiconductor and AI-linked stocks, along with at least one post-earnings analyst price-target cut while maintaining a positive rating.

Sources:

MKS Inc., SEC, Yahoo Finance, AP News

Disclaimer: This price movement analysis was generated with the help of AI. Please double-check the information provided for mistakes.

$MKSI Insider Trading Activity

$MKSI insiders have traded $MKSI stock on the open market 22 times in the past 6 months. Of those trades, 0 have been purchases and 22 have been sales.

Here’s a breakdown of recent trading of $MKSI stock by insiders over the last 6 months:

GERALD G COLELLA has made 0 purchases and 7 sales selling 20,000 shares for an estimated $6,668,075.
JOHN TSENG-CHUNG LEE (President & CEO) has made 0 purchases and 2 sales selling 20,000 shares for an estimated $6,174,900.
RAMAKUMAR MAYAMPURATH (EVP & CFO) sold 8,810 shares for an estimated $2,779,378
DAVID PHILIP HENRY (EVP, Global Str Mktg & GM, MSD) has made 0 purchases and 2 sales selling 8,500 shares for an estimated $2,712,833.
JAMES ALAN SCHREINER (EVP & COO) has made 0 purchases and 4 sales selling 4,281 shares for an estimated $1,458,275.
MICHELLE M MCCARTHY (SVP & Chief Accounting Officer) sold 2,434 shares for an estimated $767,269
JOSEPH B DONAHUE sold 2,100 shares for an estimated $688,703
PETER III CANNONE sold 1,350 shares for an estimated $409,590
ELIZABETH MORA has made 0 purchases and 2 sales selling 600 shares for an estimated $170,694.
JOHN EDWARD WILLIAMS (EVP & GM, PSD) sold 457 shares for an estimated $131,757

To track insider transactions, check out Investivoq's insider trading dashboard. You can access data on insider stock transactions through the Investivoq API insider transaction endpoint.

EARLY ACCESS

Receive MKSI Data Alerts

Real-time alerts on filings, insider trades, and market signals — before everyone else.

Get Alerts →

$MKSI Hedge Fund Activity

We have seen 397 institutional investors add shares of $MKSI stock to their portfolio, and 401 decrease their positions in their most recent quarter.

Here are some of the largest recent moves:

INVESCO LTD. removed 2,301,811 shares (-49.4%) from their portfolio in Q3 2026, for an estimated $610,808,566
JPMORGAN CHASE & CO removed 1,588,392 shares (-47.1%) from their portfolio in Q3 2026, for an estimated $421,495,701
ALKEON CAPITAL MANAGEMENT LLC added 1,072,040 shares (+inf%) to their portfolio in Q2 2026, for an estimated $476,843,392
SACHEM HEAD CAPITAL MANAGEMENT LP added 812,700 shares (+inf%) to their portfolio in Q2 2026, for an estimated $361,488,960
SIXTH STREET PARTNERS MANAGEMENT COMPANY, L.P. removed 808,198 shares (-100.0%) from their portfolio in Q3 2026, for an estimated $214,463,421
VICTORY CAPITAL MANAGEMENT INC removed 576,494 shares (-94.7%) from their portfolio in Q3 2026, for an estimated $152,978,447
QUBE RESEARCH & TECHNOLOGIES LTD added 576,011 shares (+95.0%) to their portfolio in Q3 2026, for an estimated $152,850,278

To track hedge funds' stock portfolios, check out Investivoq's institutional holdings dashboard. You can access data on hedge funds moves and 13F filings through the Investivoq API 13F endpoint.

$MKSI Analyst Ratings

Wall Street analysts have issued reports on $MKSI in the last several months. We have seen 6 firms issue buy ratings on the stock, and 0 firms issue sell ratings.

Here are some recent analyst ratings:

Citigroup issued a "Buy" rating on 11/06/2026
Needham issued a "Buy" rating on 11/05/2026
Morgan Stanley issued a "Overweight" rating on 10/26/2026
Mizuho issued a "Outperform" rating on 08/25/2026
JP Morgan issued a "Overweight" rating on 08/07/2026
Cantor Fitzgerald issued a "Overweight" rating on 08/03/2026

To track analyst ratings and price targets for $MKSI, check out Investivoq's $MKSI forecast page.

$MKSI Price Targets

Multiple analysts have issued price targets for $MKSI recently. We have seen 11 analysts offer price targets for $MKSI in the last 6 months, with a median target of $380.0.

Here are some recent targets:

Elizabeth Sun from Citigroup set a target price of $350.0 on 11/06/2026
Joseph Quatrochi from Wells Fargo set a target price of $195.0 on 11/06/2026
James Ricchiuti from Needham set a target price of $300.0 on 11/05/2026
Joseph Moore from Morgan Stanley set a target price of $330.0 on 10/26/2026
Vijay Rakesh from Mizuho set a target price of $330.0 on 08/25/2026
Mayur Ramdhani from JP Morgan set a target price of $380.0 on 08/07/2026
Matthew Prisco from Cantor Fitzgerald set a target price of $600.0 on 08/03/2026

This article is not financial advice. See Investivoq's disclaimers for more information. Note that there may be inaccuracies due to mistakes in ticker-mapping, and other anomalies.