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Elizabeth Mora - DirectorOpen-market sale$75K- John Tseng-Chung Lee
About MKS INC (MKSI)
MKS INC files with the SEC under CIK 0001049502 and is classified as industrial instruments for measurement, display, and control. It is grouped with Information Technology companies on this site.
MKSI Form 4 activity by transaction type, last 90 days
| Form 4 transaction type | Transactions | Shares | Total value |
|---|---|---|---|
| Open-market sale | 3 | 10,757 | $3.23M |
| Grant or award | 1 | 954.04 |
Dollar totals cover purchases and sales only (codes P and S). Grants, option exercises, gifts and tax withholding are counted in shares, because none of them is a trade at a market price.
MKSI insider transactions (Form 4)
4085 Form 4 filings on record, the earliest from Oct 2, 2024, newest first. Filing history page 3 of 3.
| Date | Insider | Transaction | Security | Shares | Price | Value |
|---|---|---|---|---|---|---|
 James Alan Schreiner - Officer | Open-market sale | Common Stock | 838 | $124.00 | $104K | |
 David Philip Henry - Officer | Open-market sale | Common Stock | 5,000 | $130.00 | $650K | |
| Elizabeth Mora - Director | Open-market sale | Common Stock | 300 | $99.85 | $30K | |
| James Alan Schreiner - Officer | Option exercise | Common Stock | 2,641 | - | - | |
| James Alan Schreiner - Officer | Tax withholding / forfeiture | Common Stock | 1,249 | $100.22 | $125K | |
| James Alan Schreiner - Officer | Option exercise | Restricted Stock Unit | 2,641 | - | - | |
 John Edward Williams - Officer | Option exercise | Common Stock | 947.29 | - | - | |
| John Edward Williams - Officer | Tax withholding / forfeiture | Common Stock | 308 | $104.73 | $32K | |
| John Edward Williams - Officer | Option exercise | Restricted Stock Unit | 947.29 | - | - | |
| James Alan Schreiner - Officer | Grant or award | Restricted Stock Unit | 1,330 | - | - | |
 Jacqueline F. Moloney - Director | Open-market sale | Common Stock | 300 | $92.10 | $28K | |
| James Alan Schreiner - Officer | Open-market sale | Common Stock | 957 | $102.44 | $98K | |
| David Philip Henry - Officer | Open-market sale | Common Stock | 2,000 | $105.00 | $210K | |
| Elizabeth Mora - Director | Open-market sale | Common Stock | 300 | $81.78 | $25K | |
| Elizabeth Mora - Director | Grant or award | Common Stock | 2,479 | - | - | |
| Jacqueline F. Moloney - Director | Grant or award | Common Stock | 2,479 | - | - | |
 Wissam G. Jabre - Director | Grant or award | Common Stock | 2,479 | - | - | |
 Raj Batra - Director | Grant or award | Common Stock | 2,479 | - | - | |
 Joseph B. Donahue - Director | Grant or award | Common Stock | 2,479 | - | - | |
 Peter Cannone III - Director | Grant or award | Common Stock | 2,479 | - | - | |
 Gerald G. Colella - Director | Grant or award | Common Stock | 2,479 | - | - | |
| John Edward Williams - Officer | Option exercise | Common Stock | 1,740 | - | - | |
| John Edward Williams - Officer | Tax withholding / forfeiture | Common Stock | 565 | $63.69 | $36K | |
| John Edward Williams - Officer | Option exercise | Restricted Stock Unit | 1,740 | - | - | |
| Michelle M. McCarthy - Officer | Option exercise | Common Stock | 968 | - | - | |
| Michelle M. McCarthy - Officer | Option exercise | Common Stock | 1,106 | - | - | |
| Michelle M. McCarthy - Officer | Tax withholding / forfeiture | Common Stock | 608 | $68.48 | $42K | |
| Michelle M. McCarthy - Officer | Option exercise | Restricted Stock Unit | 968 | - | - | |
| Michelle M. McCarthy - Officer | Option exercise | Restricted Stock Unit | 1,106 | - | - | |
| Michelle M. McCarthy - Officer | Grant or award | Restricted Stock Unit | 5,210 | - | - | |
| Jacqueline F. Moloney - Director | Open-market sale | Common Stock | 300 | $114.80 | $34K | |
| John Tseng-Chung Lee - Officer | Option exercise | Common Stock | 2,010 | - | - | |
| John Tseng-Chung Lee - Officer | Option exercise | Common Stock | 984 | - | - | |
| John Tseng-Chung Lee - Officer | Tax withholding / forfeiture | Common Stock | 2,994 | $114.60 | $343K | |
| John Tseng-Chung Lee - Officer | Option exercise | Restricted Stock Unit | 2,010 | - | - | |
| John Tseng-Chung Lee - Officer | Option exercise | Restricted Stock Unit | 984 | - | - | |
| Elizabeth Mora - Director | Open-market sale | Common Stock | 275 | $113.41 | $31K | |
| Ramakumar Mayampurath - Officer | Grant or award | Restricted Stock Unit | 16,591 | - | - | |
| Wissam G. Jabre - Director | Grant or award | Common Stock | 2,009 | - | - | |
| Jacqueline F. Moloney - Director | Open-market sale | Common Stock | 250 | $108.90 | $27K |
Recent MKSI Form 144 notices of proposed sale
3An insider files Form 144 before selling restricted or control stock. It announces a planned sale. If the sale goes ahead, it shows up later on a Form 4.
| Filed | Filer | Relationship | Shares | Market value | Notice |
|---|---|---|---|---|---|
| Mora Elizabeth | Director | 300 | $75K | View on EDGAR | |
| Lee John Tseng-Chung | Officer, Director | 10,000 |
Stock trades in MKSI disclosed by members of the U.S. House in the last 12 months, newest first. Values are the ranges as filed.
| Member | Type | Traded | Disclosed | Value range | Owner | Days to disclose | Filing |
|---|---|---|---|---|---|---|---|
 Lisa C. McClainRepublican, MI-09 | Sale |
MKSI insider trading FAQ
What is the latest insider trade for MKSI?
MKS INC (MKSI) had 4 insider filings in the last 90 days, with the most recent on 2026-09-02. The full record for MKSI runs to 85 Form 4 filings, the earliest from 2024-10-02. InsiderAlpha adds new Form 4, Form 144 and 8-K filings as they arrive from SEC EDGAR.
How many insiders are buying MKSI stock?
No insider purchases of MKSI were filed in the last 90 days.
How many insiders are selling MKSI stock?
3 insider sales of MKSI were filed in the last 90 days, totaling $3.23M.
Where can I see MKSI SEC filings (Form 4, 10-K, 10-Q, 8-K)?
This page collects MKSI Form 4 insider transactions, Form 144 sale notices and 8-K filings in one place. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
More Information Technology companies with insider activity
Recent insider filings
10The EDGAR links open each original Form 4, so you can check any number on this page against the filing it came from.
- - Elizabeth Mora view on EDGAR
- - Renee Martel Donlan view on EDGAR
- - John Tseng-Chung Lee view on EDGAR
- - John Edward Williams view on EDGAR
- - James Alan Schreiner view on EDGAR
- - James Alan Schreiner view on EDGAR
- - Michelle M. McCarthy view on EDGAR
- - David Philip Henry view on EDGAR
- - Elizabeth Mora view on EDGAR
Related companies with recent insider activity
Learn more
- Insider selling: signal or noise?
- Why most insider sales are routine, and the few patterns worth a second look.
- Form 144 vs Form 4
- A Form 144 announces a planned sale; the Form 4 reports it after it happens.
- Insider activity in Information Technology
- Where MKSI's peers are being bought and sold.
- Every recent Form 4
- The market-wide feed, updated as filings arrive from SEC EDGAR.
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- Every MKSI Form 4 filing on record
- Up to 3 months of MKSI price history
- The daily trading plan of ranked insider buys, on a delay, with the plan archive
