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Of the 16 tracked institutions holding MKSI, 9 have a 3-year clone track record — 8 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 16 tracked institutional investors we monitor, MKSI (MKS INC.) is held with a combined value of $5.79B across 27,495,537 shares. The largest holder is BlackRock, Inc. with a position worth $1.53B (0.03% of their portfolio). 4 funds opened new positions in the most recent quarter. 7 funds increased their holdings. 5 funds reduced their position.
Total Institutional Value
$5.79B
Total Shares Held
27,495,537
Institutional Holders
16
% of Shares Outstanding
40.7%
of 67.54M shares · SEC 2026-04-29
Days to Cover
3.9+3.9%
5.16M shares short · FINRA 2026-07-15
Tracked 13F institutions hold 40.7% 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 2026-04-29), 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. | $1.53B | 0.03% | +8.2% |
| 2 | VANGUARD GROUP INC | $1.20B | 0.02% | -3.4% |
| 3 | STATE STREET CORP | $472.89M | 0.02% | +2.0% |
| 4 | FMR LLC | $444.42M | 0.02% | -39.5% |
| 5 | WELLINGTON MANAGEMENT GROUP LLP | $421.27M | 0.08% | -28.2% |
| 6 | PRICE T ROWE ASSOCIATES INC /MD/ | $390.71M | 0.05% | -38.3% |
| 7 | Point72 Asset Management, L.P. | $370.07M | 0.64% | +157.3% |
| 8 | Whale Rock Capital Management LLC | $300.30M | 3.88% | New |
| 9 | CITADEL ADVISORS LLC | $217.64M | 0.15% | +106.8% |
| 10 | MILLENNIUM MANAGEMENT LLC | $205.53M | 0.09% | +9.4% |
SEC Schedule 13D (activist) and 13G (passive) filings for MKSI. Filed when an investor acquires 5%+ ownership.
| 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 $1.53B, representing 0.03% of their portfolio. In total, 16 institutional investors hold MKSI with a combined value of $5.79B.
In the most recent quarter, 4 funds opened a new position in MKSI. Additionally, 7 increased their holdings and 5 reduced their positions.
Institutional investors hold $5.79B worth of MKSI stock across 16 positions. The largest institutional holder is BlackRock, Inc. with $1.53B 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 →
| Aug 4, 2025 |
Last Close
$329.18
2026-07-24
YTD
+95.5%
67% of 52-week range
