Transaction · 0001049502-26-000030

Lee John Tseng-Chung

Lee John Tseng-Chung, PRES, CEO, reported an open-market or private sale at MKS INC involving 1890.000000 shares for an estimated $490839.05. Reported holdings after the transaction were 154696.107700 shares. A 10b5-1 reference was not detected in the stored filing text.

Open-market sellSEC transaction code SPRES, CEO
MKSIMKS INC
Filing timeFeb 23
Trade dateFeb 20, 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
$253.71
Pre-filing
1mo ago -13.0%1w ago +2.8%1d ago -1.8%
Returns since
7d -3.7%30d -4.0%90d +26.4%180d +10.0%1y +6.1%

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 2026-02-23Filed 193 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

Non-derivative
Type
Sell
Code S
Identifier
0001049502-26-000030
Common Stock
Transaction date
Feb 20, 2026
Filed Feb 23, 2026, 12:00 AM · 3d delay
Shares
1.89k sh
$25.9k per share
Estimated value
-$49.0M
Computed from shares × price
Holdings after
154k sh
Direct

Filing signal explanations

Badges describe filing facts only — not predictions.

Cluster 14dRepeat 30dPattern $10.0MLarge $100M
Direct Ownership Repeat Seller
+6score
Filing-only score

+6

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

Positive filing signal

This filing has a modest positive filing-only score. Treat it as a useful flag for review, not as a buy signal.

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

    This transaction was executed in multiple trades at prices ranging from $255.425 to $256.415. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes…

  2. F2

    This transaction was executed in multiple trades at prices ranging from $256.4275 to $257.275. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes…

  3. F3

    This transaction was executed in multiple trades at prices ranging from $257.445 to $258.320. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes…

  4. F4

    This transaction was executed in multiple trades at prices ranging from $259.170 to $259.920. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes…

Original filing · 0001049502-26-000030
Related transactions

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Same reporting owner
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