# MKS INC (MKSI) — Institutional Ownership

Source: SEC EDGAR 13F filings, congressional STOCK Act disclosures, SEC Form 4 insider transactions.
CUSIP: 55306NAB0
Page URL: https://superinvestorclub.com/stock/MKSI
Last updated: 2026-07-08T12:48:27.506Z

## Summary

As of the most recent 13F filing period, MKS INC (MKSI) is held by 0 tracked superinvestors with an aggregate position value of $0 representing 0 shares.

## Top institutional holders (0)

| Rank | Manager | Fund | Shares | Value | % of Portfolio | Period |
|------|---------|------|--------|-------|----------------|--------|

## Ownership history (quarter-over-quarter)

- 2025-06-30: 1 holders, $11.9M aggregate, 011985000 shares
- 2025-09-30: 1 holders, $18.3M aggregate, 016705000 shares
- 2025-12-31: 1 holders, $8.0M aggregate, 06255000 shares

## Recent congressional trades (14)

- 2025-10-31: Lisa McClain (Republican-MI) sale $1,001 - $15,000
- 2025-10-30: Lisa McClain (Republican-MI) purchase $1,001 - $15,000
- 2025-10-30: Lisa McClain (Republican-MI) sale $1,001 - $15,000
- 2025-08-04: Lisa McClain (Republican-MI) purchase $1,001 - $15,000
- 2025-04-20: Ro Khanna (Democrat-CA) purchase $1,001 - $15,000
- 2025-04-17: Ro Khanna (Democrat-CA) sale $1,001 - $15,000
- 2025-04-16: Ro Khanna (Democrat-CA) sale $1,001 - $15,000
- 2025-04-15: Ro Khanna (Democrat-CA) sale $15,001 - $50,000
- 2025-04-15: Ro Khanna (Democrat-CA) sale $1,001 - $15,000
- 2025-04-10: Ro Khanna (Democrat-CA) purchase $1,001 - $15,000
- 2025-04-08: Ro Khanna (Democrat-CA) purchase $1,001 - $15,000
- 2025-04-04: Ro Khanna (Democrat-CA) purchase $1,001 - $15,000
- 2025-04-03: Ro Khanna (Democrat-CA) purchase $15,001 - $50,000
- 2025-04-03: Ro Khanna (Democrat-CA) purchase $1,001 - $15,000

## Recent insider transactions (0)


## Citation

When citing, use: "MKS INC (MKSI) institutional ownership data via Superinvestor (https://superinvestorclub.com/stock/MKSI), aggregating SEC 13F, Form 4, and congressional disclosures."