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MKSI · Mks Inc
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TEAM-0.32% 13F +439META+2.47% 13F +2,694RCG-2.04% CLUSTERUTHR-4.03% 13F +425CRWV-1.12% 13F +693CRM-0.46% 13F +1,018CVNA+2.74% 13F +794TPL-0.71% 13F +444NET-4.47% 13F +710MSTR-1.35% 13F +526DELL+15.81% 13F +1,203CRWD-5.42% 13F +1,382ANET+2.87% 13F +1,323COIN-1.05% 13F +475TEAM-0.32% 13F +439META+2.47% 13F +2,694RCG-2.04% CLUSTERUTHR-4.03% 13F +425CRWV-1.12% 13F +693CRM-0.46% 13F +1,018CVNA+2.74% 13F +794TPL-0.71% 13F +444NET-4.47% 13F +710MSTR-1.35% 13F +526DELL+15.81% 13F +1,203CRWD-5.42% 13F +1,382ANET+2.87% 13F +1,323COIN-1.05% 13F +475
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MKSI

MKS INC
MEDICAL DEVICES · INDUSTRIAL INSTRUMENTS FOR MEASUREMENT, DISPLAY, AND CONTROL · CIK 0001049502
CONGRESS · 1FORM 144 · 3☆ WATCH
INSIDER NET · 180D
-$25.1M
open-market buys minus sells, Form 4 codes P and S
INSIDER BUYERS · 180D
0
CONGRESS BUYERS · 1Y
1
FUNDS ADDED · QTR
458
13F, latest reported quarter
REVENUE GROWTH
+9.6%
XBRL, annual
NET MARGIN
7.5%
CONVERSIONS · 180D
4
codes C/M, not in net · no price filed
SEVEN FACTS, RANKED AGAINST THE SECTOR · RANK IS NOT A FORECAST
INSIDERS
net -$25.1M over 180 days
-$4.7M over 90 days
below 91% of Medical Devices
CONGRESS
1 member bought in the last year
the lowest in Medical Devices
FUNDS
458 funds added or opened last quarter
more than 90% of Medical Devices
REVENUE
+9.6% year over year
more than 55% of Medical Devices
MARGIN
7.5% net margin
more than 72% of Medical Devices
BUYBACKS
$45.0M repurchased, FY to 2025-12-31
below 51% of Medical Devices
SHORT
8.5% of shares outstanding short · 4.0 days to cover · settled 2026-07-31
more than 84% of Medical Devices
THE SITUATION · EVERY LINE IS ONE RULE OVER ONE DATASET
Insiders are net sellers: -$25.1M across 13 people in 180 days.
458 funds added or opened positions in the latest 13F quarter, of 782 holders.
1 member of Congress reported buying it this year.
The year, with the filings on it
Total return indexed to 100 over the last 12 months · every marker is a federal filing, placed at its date — hover any marker for the detail
TOTAL 12M RETURN +147.4%
+147.4%12M
-2%+111%+225%+338%2025-092025-102025-122026-032026-052026-072026-09 2026-02-20 · Lee John Tseng-Chung sold $3.4M2026-02-20 · Lee John Tseng-Chung sold $3.3M2026-05-22 · Lee John Tseng-Chung sold $3.2M2026-08-14 · Lee John Tseng-Chung sold $3.0M2026-05-22 · Mayampurath Ramakumar sold $2.8M2026-05-27 · COLELLA GERALD G sold $2.7M2026-02-24 · COLELLA GERALD G sold $2.5M2026-02-20 · COLELLA GERALD G sold $2.5M2026-06-01 · Henry David Philip sold $1.9M2026-05-27 · COLELLA GERALD G sold $1.6M2026-05-11 · Burke Kathleen Flaherty sold $1.4M2026-02-20 · Burke Kathleen Flaherty sold $1.1M2026-02-24 · Schreiner James Alan sold $1.0M2026-03-06 · Taranto Eric Robert sold $1.0M2026-05-27 · COLELLA GERALD G sold $948.0K2026-05-11 · Taranto Eric Robert sold $911.3K2026-06-12 · Schreiner James Alan sold $853.8K2026-05-26 · Henry David Philip sold $826.2K2026-06-05 · McCarthy Michelle M sold $767.3K2026-05-27 · Donahue Joseph B sold $688.7K2025-09-18 · Henry David Philip sold $650.0K2026-05-27 · COLELLA GERALD G sold $607.5K2026-05-27 · COLELLA GERALD G sold $547.2K2026-02-20 · Williams John Edward sold $523.8K2026-02-20 · Henry David Philip sold $523.1K2026-02-20 · Lee John Tseng-Chung sold $512.5K2026-02-20 · Lee John Tseng-Chung sold $490.8K2026-05-13 · Moloney Jacqueline F sold $446.6K2026-05-18 · CANNONE PETER III sold $409.6K2026-02-20 · Taranto Eric Robert sold $359.6K2026-02-20 · CANNONE PETER III sold $322.6K2026-05-14 · Moloney Jacqueline F sold $312.2K2026-06-12 · Schreiner James Alan sold $281.3K2026-06-10 · Schreiner James Alan sold $247.9K2026-02-20 · Moloney Jacqueline F sold $205.2K2026-02-20 · McCarthy Michelle M sold $204.3K2026-02-20 · McCarthy Michelle M sold $162.2K2026-05-27 · COLELLA GERALD G sold $153.3K2026-08-03 · Williams John Edward sold $131.8K2025-09-18 · Schreiner James Alan sold $103.9K2025-10-22 · Schreiner James Alan sold $98.6K2026-06-01 · Mora Elizabeth sold $95.4K2026-09-01 · Mora Elizabeth filed to sell $75.3K2026-08-14 · Lee John Tseng-Chung filed to sell $3.0M2026-08-03 · Williams John Edward filed to sell $131.8K
INSIDER SELLFORM 144
INDEXED RETURN, DIVIDEND-ADJUSTED — NOT A PRICE CHART · LARGE TRADES DRAWN FIRST WHEN A NAME FILES HEAVILY
Live price
Daily candles from TradingView, on their licence — no filings are marked on this one
WHY THIS NAME IS ON THE DESK
Insiders have filed to sell — before selling.
The record shows a net $25.1M sold by insiders over 180 days, 458 funds added last quarter, 1 Congress member(s) bought in 12 months, $3.2M in planned Form 144 sales. Every figure is a federal filing, dated the day it became public.
Backtest this pattern Open the screener
Same sector, ranked by filing activity
Sector from the SEC's own SIC classification
TMOPENROKBLFSMTDSIBNWRBYISRGTXGDXCMEWTMDX
Insider transactions
Form 4 purchases and sales (codes P and S) — grants, option exercises and preferred conversions excluded

Over the last 180 days, MKS INC insiders sold a net $25.1M of stock across 100 Form 4 purchases and sales, with 0 insider(s) buying. Source: SEC Form 4 filings, as of 2026-09-04.

INSIDER
FILED
SHARES
VALUE
Mora Elizabeth
Director
SELL
2026-09-01
300.0
$75.3K
Lee John Tseng-Chung
President & CEO
SELL
2026-08-14
10,000.0
$3.0M
Williams John Edward
EVP & GM, PSD
SELL
2026-08-03
457.0
$131.8K
Schreiner James Alan
EVP & COO
SELL
2026-06-12
812.0
$281.3K
Schreiner James Alan
EVP & COO
SELL
2026-06-12
2,471.0
$853.8K
100 TRANSACTIONS ON RECORD

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Institutional holders
13F · holdings as of the latest quarter funds have reported
BlackRock, Inc.
6,930,030.0 sh
$3.1B
Invesco Ltd.
4,661,664.0 sh
$2.1B
VANGUARD PORTFOLIO MANAGEMENT LLC
3,707,327.0 sh
$1.6B
JPMORGAN CHASE & CO
3,373,844.0 sh
$1.4B
VANGUARD CAPITAL MANAGEMENT LLC
3,049,560.0 sh
$1.4B
SCHEDULE 13D/G
No 5%+ ownership filings
Nobody has crossed 5% with a filing obligation. Absence is a fact here, not missing data.
Planned sales · Form 144
Filed before the sale — intent, not a trade
Mora Elizabeth
FILED 2026-09-01
$75.3K
Lee John Tseng-Chung
FILED 2026-08-14
$3.0M
Williams John Edward
FILED 2026-08-03
$131.8K
Fund concentration
N-PORT · funds ranked by how much of THEMSELVES they put in this stock — the conviction number 13F cannot show
Spear Alpha ETF
$8.2M POSITION · AS OF 2026-03-31
5.7%
ICON HEALTH AND INFORMATION TECHNOLOGY FUND
$4.1M POSITION · AS OF 2026-03-31
5.5%
Pinnacle Focused Opportunities ETF
$2.7M POSITION · AS OF 2026-02-28
4.4%
Royce Premier Fund
$39.2M POSITION · AS OF 2026-03-31
3.9%
Archer Stock Fund
$970.5K POSITION · AS OF 2026-02-28
3.9%
CRM SMALL/MID CAP VALUE FUND
$5.6M POSITION · AS OF 2026-04-30
3.7%
SEC N-PORT, MONTHLY WITH A ~60-DAY PUBLIC LAG · FUNDS ≥ $10M · % = SHARE OF THE FUND'S OWN BOOK
Executive pay vs shareholder return
DEF 14A pay-versus-performance disclosure · both the headline pay and the SEC's mark-to-market figure, beside the return the company delivered and the return of the peer group it chose itself
FY
CEO TOTAL
ACTUALLY PAID
OTHER NEOs AVG
TSR
PEER TSR
2025
$13.0M
$25.0M
$2.8M
+10%
+105%
2024
$8.8M
$7.4M
$2.0M
-28%
+42%
2023
$7.9M
$13.2M
$2.1M
-30%
+22%
2022
$8.1M
$3.5M
$2.0M
-43%
+1%
2021
$7.6M
$11.4M
$2.3M
+16%
+29%
TAGGED BY THE COMPANY UNDER SEC ITEM 402(v) · RETURN IS CUMULATIVE FROM THE START OF THE DISCLOSURE PERIOD · GREEN WHERE THE COMPANY BEAT ITS OWN PEER GROUP
Fundamentals
Annual figures from XBRL filings · pick a past date to see them exactly as the market knew them then — restatements and all
2025-122024-122023-122022-12
REVENUE$3.9B$3.6B$3.6B$3.5B
GROSS PROFIT$1.8B$1.7B$1.6B$1.5B
OPERATING INCOME$528.0M$498.0M$-1.6B$617.0M
NET INCOME$295.0M$190.0M$-1.8B$333.0M
EPS (DILUTED)4.372.81-27.545.56
OPERATING CASH FLOW$645.0M$528.0M$319.0M$529.0M
CASH$418.0M$420.0M$507.0M—
LONG-TERM DEBT$4.2B$4.5B$4.7B$5.1B
BUYBACKS$45.0M$0$0—
DIVIDENDS PAID$59.0M$59.0M$59.0M$52.0M
SEC XBRL · FISCAL-YEAR PERIODS · AS KNOWN ON 2026-09-04 · NOBODY ELSE SHOWS FUNDAMENTALS AS OF A PAST DATE
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Public filings, honestly analyzed. Official US government sources in one desk — every figure carries the date it was filed, and the methodology is published, backtest included.

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