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MKSI · Mks Inc

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Market Cap
$17.29B
Shares
67.62M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 775
Total Value: $33,950,102,138
Total Shares: 76,333,325
Showing 1–100 of 804 holdings by value · page 1 of 9

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 775 13F filers · Δ vs Mar 31, 2026
Top Holder
9.1%
Sep 2023 → Jun 2026 · range 9.1% – 12.0%
−0.2 pts
Top 5
28.5%
Sep 2023 → Jun 2026 · range 26.9% – 44.2%
+1.6 pts
Top 10
41.3%
Sep 2023 → Jun 2026 · range 40.2% – 61.8%
+1.1 pts
HHI
265
Sep 2023 → Jun 2026 · range 257 – 516
Broadly held+8

Quarterly Activity

vs Mar 31, 2026
New
211
Increased
249
Decreased
250
Sold Out
60
Unchanged
65
Holder count: +151
Institutional value: +107.1%
Shares held: +7.0%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 804
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1049502 CUSIP 55306N104 13F (30d) 584 filings 552 filers Visit website Investor relations