// company-profile
Mks Inc
MKSIExchangeNasdaqSectorIndustrial Instruments For Measurement, Display, and ControlInc.MAFilings161Insiders34
// api This Mks Inc insider-trading data is served live by the Form4API insider trading API. Get the same data via API.
// activity-summary
Recent insider activity is bearish. Over the last 30 days, insiders net sold $3.8M across 5 transactions.
// 90-day insight
Over the last 90 days, Mks Inc insiders bought $0 (16 transactions) and sold $7.9M (12 transactions).
- Most active insider: McCarthy Michelle M with 9 transactions totaling $1.1M.
- Largest single sale: $3.2M by Lee John Tseng-Chung on May 22, 2026.
- 52% of recent sales were pre-scheduled 10b5-1 trades — typically less informative than open-market activity.
Activity is mixed — buys and sales are roughly balanced.
Institutional Ownership
Top 13F-HR holders of Mks Inc as of 2026-03-31
Total reported AUM
$13.70B
QoQ change
+38.2%
Reporting period
2026-03-31
#1
BlackRock, Inc.
CIK 2012383
$834.0M
3.6M shares
#2
VANGUARD CAPITAL MANAGEMENT LLC
CIK 2100119
$692.7M
3.0M shares
#3
Invesco Ltd.
CIK 914208
$663.6M
2.9M shares
Data source: SEC Form 13F-HR filings. Joined with insider activity above — see who's loading up institutionally while insiders are trading. Full 13F-HR API →
Insider Transactions
Sourced from SEC EDGAR Form 4 filings. Updated hourly.
| Date | Insider | Company | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Jun 12, 2026 | Schreiner James Alan | MKSI | Sale | 2,471 | $345.52 | $854K |
| Jun 12, 2026 | Schreiner James Alan | MKSI | Sale | 812 | $346.41 | $281K |
| Jun 12, 2026 | Schreiner James Alan | MKSI | Sale | 217 | $347.00 | $75K |
| Jun 10, 2026 | Schreiner James Alan | MKSI | Sale10b5 | 781 | $317.42 | $248K |
| Jun 5, 2026 | McCarthy Michelle M | MKSI | Sale10b5 | 2,434 | $315.23 | $767K |
45 more transactions hidden
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