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Of the 17 tracked institutions holding MKSI, 10 have a 3-year clone track record — 9 of them beat the S&P. Average holder's clone alpha: +7.4pt. It's a gauge of who owns the name, not just how many.
Among the 17 tracked institutional investors we monitor, MKSI (MKS INC.) is held with a combined value of $9.85B across 26,952,498 shares. The largest holder is BlackRock, Inc. with a position worth $3.08B (0.05% of their portfolio). TWO SIGMA ADVISERS, LP opened a new position in the most recent quarter. 5 funds increased their holdings. 11 funds reduced their position.
Total Institutional Value
$9.85B
Total Shares Held
26,952,498
Institutional Holders
17
% of Shares Outstanding
39.9%
of 67.62M shares · SEC 2026-07-28
Days to Cover
3.5-4.6%
5.49M shares short · FINRA 2026-08-14
Tracked 13F institutions hold 39.9% of MKSI's shares outstanding. This is a floor: 13F filings arrive on a ~45-day lag and we track only a subset of institutional filers, so true institutional ownership is higher. Shares-outstanding is the latest SEC cover-page figure (as of 2026-07-28), not a live float.
Ranked by estimated dollars moved (share change × implied price). 13F data lags up to 45 days.
| # | Fund | Value↓ | Portfolio % | Change |
|---|---|---|---|---|
| 1 | BlackRock, Inc. | $3.08B | 0.05% | +4.3% |
| 2 | VANGUARD GROUP INC | $1.20B | 0.02% | -3.4% |
| 3 | STATE STREET CORP | $949.44M | 0.03% | +3.7% |
| 4 | Point72 Asset Management, L.P. | $888.20M | 1.36% | +24.0% |
| 5 | PRICE T ROWE ASSOCIATES INC /MD/ | $840.63M | 0.08% | +11.2% |
| 6 | FMR LLC | $666.98M | 0.03% | -22.5% |
| 7 | WELLINGTON MANAGEMENT GROUP LLP | $629.85M | 0.11% | -22.8% |
| 8 | Whale Rock Capital Management LLC | $565.51M | 4.54% | -2.7% |
| 9 | CITADEL ADVISORS LLC | $310.32M | 0.18% | -26.3% |
| 10 | MILLENNIUM MANAGEMENT LLC | $286.93M | 0.19% | -27.9% |
| Member | Type | Date |
|---|---|---|
| Lisa McClain | Sell | Oct 31, 2025 |
| Lisa McClain | Sell | Oct 30, 2025 |
| Lisa McClain | Buy | Oct 30, 2025 |
| Lisa McClain | Buy |
As of the latest SEC 13F filings, BlackRock, Inc. is the largest institutional holder of MKSI with a position worth $3.08B, representing 0.05% of their portfolio. In total, 17 institutional investors hold MKSI with a combined value of $9.85B.
In the most recent quarter, 1 fund opened a new position in MKSI. Additionally, 5 increased their holdings and 11 reduced their positions.
Institutional investors hold $9.85B worth of MKSI stock across 17 positions. The largest institutional holder is BlackRock, Inc. with $3.08B in holdings.
A 13F filing is a quarterly report required by the SEC from institutional investment managers with over $100 million in assets. It discloses their holdings in U.S. equities. For MKSI, these filings reveal which major funds are accumulating or reducing positions, providing insights into institutional sentiment.
Get notified when hedge funds change their MKSI positions.
Alpha = the manager's 3-year clone return minus the S&P 500. A skilled roster is a stronger tell than a crowded one — though even skilled managers' edge doesn't reliably survive the 13F disclosure lag. Why →
| 2026-07-24 |
SEC Schedule 13D (activist) and 13G (passive) filings for MKSI. Filed when an investor acquires 5%+ ownership.
| Aug 4, 2025 |
Last Close
$268.05
2026-09-09
YTD
+59.2%
49% of 52-week range
