MKS Inc. shares slide as investors digest Q4 results, tariff caveats, and a post-high pullback

MKS Inc. (MKSI) is down 5.5% today. Here is some analysis on what might have caused this price movement.

Analysis: The drop appears tied to the market’s reaction to MKS’ fourth-quarter 2025 earnings release and first-quarter 2026 outlook, even though headline results were broadly in line to slightly better than expectations. The release also highlighted tariff-related uncertainties that could weigh on margins, and the stock was coming off recent record levels—often a setup for “sell-the-news” profit-taking.

Details:

MKS reported Q4 2025 revenue of $1.033 billion and non-GAAP diluted EPS of $2.47, alongside GAAP net income of $108 million ($1.58 per share).

For Q1 2026, MKS guided to revenue of about $1.04 billion (± $40 million) and non-GAAP diluted EPS of about $2.00 (± $0.28), with gross margin guided around 46% (± 1%).

The company noted its Q1 guidance assumptions incorporate the current business environment, including the impact of U.S. import tariffs and potential retaliatory actions.

Shares had recently traded at record highs, which can amplify downside moves when investors reassess valuation after earnings.

Sources:

GlobeNewswire

Investors.com

Associated Press

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 6 times in the past 6 months. Of those trades, 0 have been purchases and 6 have been sales.

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

DAVID PHILIP HENRY (EVP, Global Str Mktg & GM, MSD) sold 5,000 shares for an estimated $650,000
JAMES ALAN SCHREINER (EVP & COO) has made 0 purchases and 2 sales selling 1,549 shares for an estimated $202,513.
ELIZABETH MORA has made 0 purchases and 2 sales selling 600 shares for an estimated $77,598.
JACQUELINE F MOLONEY sold 300 shares for an estimated $36,642

To track insider transactions, check out Quiver Quantitative's insider trading dashboard.

$MKSI Hedge Fund Activity

We have seen 292 institutional investors add shares of $MKSI stock to their portfolio, and 211 decrease their positions in their most recent quarter.

Here are some of the largest recent moves:

VICTORY CAPITAL MANAGEMENT INC removed 1,019,817 shares (-28.5%) from their portfolio in Q4 2025, for an estimated $162,966,756
POINT72 ASSET MANAGEMENT, L.P. added 1,013,553 shares (+inf%) to their portfolio in Q3 2025, for an estimated $125,447,454
NORDEA INVESTMENT MANAGEMENT AB removed 996,602 shares (-62.4%) from their portfolio in Q4 2025, for an estimated $159,256,999
JPMORGAN CHASE & CO added 886,847 shares (+133.4%) to their portfolio in Q4 2025, for an estimated $141,718,150
PRICE T ROWE ASSOCIATES INC /MD/ removed 879,169 shares (-24.2%) from their portfolio in Q4 2025, for an estimated $140,491,206
RAFFERTY ASSET MANAGEMENT, LLC removed 878,114 shares (-100.0%) from their portfolio in Q3 2025, for an estimated $108,684,169
UBS AM, A DISTINCT BUSINESS UNIT OF UBS ASSET MANAGEMENT AMERICAS LLC removed 625,561 shares (-75.8%) from their portfolio in Q4 2025, for an estimated $99,964,647

To track hedge funds' stock portfolios, check out Quiver Quantitative's institutional holdings dashboard.

$MKSI Government Contracts

We have seen $1,024,770 of award payments to $MKSI over the last year.

Here are some of the awards which we have have seen pay out the most over the last year:

AUTOMATED FEMTOSECOND LASER OPTICAL PARAMETRIC AMPLIFIER SYSTEM: $173,950
TSUNAMI LASER UPGRADE: $124,906
MAINTENANCE AGREEMENT FOR MAI TAI BB LASER (S/N 1552EV) AND MAI TAI LASER (S/N 4724EV): $107,111
PURCHASE OF TUNABLE DIODE LASER SYSTEM: $69,666
VIBRATION ISOLATED OPTICAL WORK BENCHES: $54,815

To track government contracts to publicy traded companies, check out Quiver Quantitative's government contracts dashboard.

$MKSI Congressional Stock Trading

Members of Congress have traded $MKSI stock 3 times in the past 6 months. Of those trades, 1 have been purchases and 2 have been sales.

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

REPRESENTATIVE LISA C. MCCLAIN has traded it 3 times. They made 1 purchase worth up to $15,000 on 10/30 and 2 sales worth up to $30,000 on 10/31, 10/30.

To track congressional stock trading, check out Quiver Quantitative's congressional trading dashboard.

$MKSI Analyst Ratings

Wall Street analysts have issued reports on $MKSI in the last several months. We have seen 7 firms issue buy ratings on the stock, and 0 firms issue sell ratings.

Here are some recent analyst ratings:

TD Cowen issued a "Buy" rating on 01/22/2026
Morgan Stanley issued a "Overweight" rating on 01/22/2026
Needham issued a "Buy" rating on 01/13/2026
Mizuho issued a "Outperform" rating on 12/17/2025
Citigroup issued a "Buy" rating on 11/12/2025
Benchmark issued a "Buy" rating on 11/07/2025
Keybanc issued a "Overweight" rating on 11/07/2025

To track analyst ratings and price targets for $MKSI, check out Quiver Quantitative'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 $230.0.

Here are some recent targets:

Joseph Quatrochi from Wells Fargo set a target price of $210.0 on 01/22/2026
James Ricchiuti from Needham set a target price of $260.0 on 01/22/2026
Krish Sankar from TD Cowen set a target price of $230.0 on 01/22/2026
Vivek Arya from B of A Securities set a target price of $255.0 on 01/22/2026
Joseph Moore from Morgan Stanley set a target price of $258.0 on 01/22/2026
Matthew Prisco from Cantor Fitzgerald set a target price of $300.0 on 01/20/2026
Steve Barger from Keybanc set a target price of $250.0 on 01/16/2026

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