Transaction · 0001049502-26-000002

Lee John Tseng-Chung

Lee John Tseng-Chung, PRES, CEO, reported a transaction classified as grant at MKS INC involving 50971.840000 shares. Reported holdings after the transaction were 139124.462000 shares. A 10b5-1 reference was not detected in the stored filing text.

grantSEC transaction code APRES, CEO
MKSIMKS INC
Filing timeFeb 09
Trade dateFeb 08, 2026
Filing · SECView on SEC
InsiderProfile

Price performance since filing

Close on the filing date, the pre-filing context, and the forward return at standard windows
Price at filing
$250.60
Pre-filing
1mo ago -25.7%1w ago -6.1%1d ago -3.0%
Returns since
7d +4.0%30d -10.5%90d +25.0%180d +21.7%1y +8.1%

MKSI price since this filing

30 days of pre-filing context and vertical markers at the filing date plus 7d / 30d / 90d / 180d / 1y afterwards
MKSI since 2026-02-09Filed 207 days ago · 30 days of pre-filing context shaded
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Filing datePost-filing windows (7d, 30d, 90d, 180d, 1y)30 days of pre-filing context

Transaction facts

Stored Form 4 columns with their raw values

Derivative
Type
grant
Code A
Identifier
0001049502-26-000002
Restricted Stock Unit
Transaction date
Feb 08, 2026
Filed Feb 09, 2026, 06:51 PM · 1d delay
Shares
50.9k sh
Price unknown
Estimated value
—
Computed from shares × price
Holdings after
139k sh
Direct

Filing warnings

Notes recorded with this filing
1 warning
missing priceThe filing did not provide a usable price per share.

Filing signal explanations

Badges describe filing facts only — not predictions.

Cluster 14dRepeat 30dPattern $10.0MLarge $100M
Derivative Transaction Direct Ownership Large Holdings Increase
-14score
Filing-only score

-14

Compact filing score computed from stored Form 4 facts. Version v1.

Mixed or weak signal

This filing has a negative filing-only score. It may be less informative as an insider-activity signal and needs extra context.

Reported relationships & other filings

Form 4 relationship flags and nearby filing context

Reported roles

President & CEO

Officer YesDirector Yes10% NoOther No
Footnotes & amended
  1. F1

    Each restricted stock unit (RSU) represents the contingent right to receive one share of common stock of MKS Inc.

  2. F2

    These RSUs were subject to performance criteria, the achievement of which was determined on February 8, 2026, and thereafter vest in three equal annual installments beginning on February 15, 2026, pro…

Original filing · 0001049502-26-000002
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