Transaction · 0001049502-26-000113

Lee John Tseng-Chung

Lee John Tseng-Chung, PRES, CEO, reported an open-market or private sale at MKS INC involving 10000.000000 shares for an estimated $3020100.00. Reported holdings after the transaction were 134776.266700 shares. The stored filing text includes a detected 10b5-1 reference.

Open-market sellSEC transaction code SPRES, CEO
MKSIMKS INC
Filing timeAug 17
Trade dateAug 14, 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
$320.74
Pre-filing
1mo ago +10.3%1w ago -4.9%1d ago -4.5%
Returns since
7d -16.1%30d -23.2%90d -23.2%180d -23.2%1y -23.2%

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 2026-08-17Filed 18 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
0001049502-26-000113
Common Stock
Transaction date
Aug 14, 2026
Filed Aug 17, 2026, 02:11 PM · 3d delay
Shares
10.0k sh
$30.2k per share
Estimated value
-$302M
Computed from shares × price
Holdings after
134k sh
Direct

Filing signal explanations

Badges describe filing facts only — not predictions.

Cluster 14dRepeat 30dPattern $10.0MLarge $100M
Direct Ownership Large Sale 10b5-1 Detected
-4score
Filing-only score

-4

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

Neutral filing signal

This filing is broadly neutral on the filing-only scale. The Form 4 facts do not strongly tilt positive or negative.

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 effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 20, 2026.

Original filing · 0001049502-26-000113
Related transactions

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Same reporting owner
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