Who owns MKSI? 13F holders and whale ownership
MKSI is tracked across public portfolios in Whale Analyzer. This page answers who owns MKSI, which top funds are buying MKSI, aggregate disclosed value, and recent position changes based on public data. Whale Rock Capital is the largest reported holder at $300M; the top five funds control 100.0% of reported ownership; institutions were net buying last quarter (2 increased, 0 reduced); the stock trades above the aggregate whale cost basis of $229.8. Top tracked holders include Whale Rock Capital and Lee Ainslie.
Continue to the live MKSI dashboardTop holders
| Investor | Reported value | Shares | Change |
|---|---|---|---|
| Whale Rock Capital 13F portfolio Whale Rock Capital Management holdings | $300.3M | 1.3M | New |
| Lee Ainslie 13F portfolio Maverick Capital holdings | $1.7M | 7.3K | New |
Ownership concentration
Reported ownership of MKSI is highly concentrated across tracked institutions.
- Single largest holder: 99.4% of reported ownership
- Top 5 holders: 100.0%
- Top 10 holders: 100.0%
Whale activity this quarter
Across 2 tracked institutions, 2 increased. Net positioning is net buying.
- Whale Rock Capital — Whale Rock Capital Management ($300.3M) · avg cost $229.81
- Lee Ainslie — Maverick Capital ($1.7M) · avg cost $227.43
Whale cost basis vs current price
The aggregate tracked cost basis is $229.80 versus a current price of $388.61, so MKSI trades above its cost basis (+69.1%). Average unrealized P&L across tracked holders: 36%.
Sector positioning — Other
MKSI sits within the Other sector alongside 670 other tracked names. Compare whale ownership across peers:
How to use this page
Values are reported public positions from tracked 13F filers and disclosures — not real-time ownership totals. Open the live MKSI dashboard for price charts and cross-investor scans, or read the SEC 13F guide.
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Learn more in Whale Analyzer Academy
Deepen your read on MKSI with these Whale Analyzer Academy guides:
Frequently asked questions
Who owns MKSI stock?
Whale Analyzer tracks 2 public institutional holders of MKSI with a combined reported value of $302.0M. See the holder table above for the largest tracked positions.
Which top funds are buying MKSI?
Tracked institutions were net buying last quarter — 2 increased. Check the "Change" column: "New" = fresh position, "Increased" = added, "Reduced" = trimmed.
How concentrated is MKSI ownership?
The top five tracked holders report 100.0% of aggregate ownership.
Is MKSI above or below the whale cost basis?
The aggregate tracked cost basis is $229.80 versus a current price of $388.61 (+69.1%).
What does 13F ownership mean for MKSI?
Use the interactive MKSI dashboard on Whale Analyzer for real-time holder analysis, or read our 13F Alpha Signals Guide.