Who owns MKS (MKSI)?
156 holders named in SEC filings declare between 69.4% and 98.3% of MKS' shares outstanding, as of Aug 31, 2026. The largest are Vanguard (10.7%), BlackRock (10.2%) and Invesco (6.9%); the five largest hold 35.9% together. Another 615 institutions hold small positions worth 4.7%. From Mar 31, 2026 to Jun 30, 2026, institutions that filed both quarters bought 14.8% and sold 13.4% of the shares, a net purchase of 1.4%; 196 opened a position, 234 added, 249 reduced and 51 sold out. Biggest buyers: JPMorgan (+1.3M shares) and ALKEON CAPITAL MANAGEMENT LLC (+1.1M shares). Biggest sellers: Fidelity (FMR) (-434,345) and Wellington (-417,103). Schedule 13D/G filings since Mar 31, 2026: JPMORGAN CHASE & CO. fell below 5% (3.0% still declared) on Aug 31, 2026 and Victory Capital Management, Inc. fell below 5% (0.89% still declared) on Jun 30, 2026. Over time, 761 managers declared MKS in their 13F for Q2 2026, against 337 for Q4 2019: together at most 104.9% of the shares outstanding, against 95.4%.
| Holder | Filing | Share of capital | As of | Holding since (13F) |
|---|---|---|---|---|
| Vanguard | 13F | 10.7% | Jun 30, 2026 | Q4 2019 or earlier |
| BlackRock | 13F | 10.2% | Jun 30, 2026 | Q4 2019 or earlier |
| Invesco | 13F | 6.9% | Jun 30, 2026 | Q4 2019 or earlier |
| Capital Group | 13F | 4.9% | Jun 30, 2026 | Q4 2019 or earlier |
| State Street | 13F | 3.2% | Jun 30, 2026 | Q4 2019 or earlier |
| JPMorgan | 13G | 3.0% | Aug 31, 2026 | — |
| Point72 | 13F | 3.0% | Jun 30, 2026 | Q3 2025 |
| T. Rowe Price | 13F | 2.9% | Jun 30, 2026 | Q4 2019 or earlier |
| Aspex Management (HK) Ltd | 13F | 2.7% | Jun 30, 2026 | Q1 2026 |
| Geode Capital | 13F | 2.3% | Jun 30, 2026 | Q4 2019 or earlier |
| Fidelity (FMR) | 13F | 2.2% | Jun 30, 2026 | Q4 2019 or earlier |
| Wellington | 13F | 2.1% | Jun 30, 2026 | Q4 2019 or earlier |
| Whale Rock Capital Management LLC | 13F | 1.9% | Jun 30, 2026 | Q1 2026 |
| Neuberger Berman Group LLC | 13F | 1.7% | Jun 30, 2026 | Q4 2019 or earlier |
| ALKEON CAPITAL MANAGEMENT LLC | 13F | 1.6% | Jun 30, 2026 | Q2 2026 |
| Norges Bank | 13F | 1.4% | Jun 30, 2026 | Q4 2019 or earlier |
| WESTFIELD CAPITAL MANAGEMENT CO LP | 13F | 1.4% | Jun 30, 2026 | Q3 2025 |
| Sachem Head Capital Management LP | 13F | 1.2% | Jun 30, 2026 | Q2 2026 |
| Charles Schwab | 13F | 1.2% | Jun 30, 2026 | Q4 2019 or earlier |
| Citadel | 13F | 1.0% | Jun 30, 2026 | Q2 2025 |
| Morgan Stanley | 13F | 1.0% | Jun 30, 2026 | Q4 2019 or earlier |
| BNY | 13F | 0.97% | Jun 30, 2026 | Q4 2019 or earlier |
| Millennium | 13F | 0.95% | Jun 30, 2026 | Q3 2023 |
| AQR | 13F | 0.94% | Jun 30, 2026 | Q3 2023 |
| Victory Capital Management, Inc. | 13F | 0.90% | Jun 30, 2026 | Q4 2019 or earlier |
MKS institutional ownership over time
| Quarter | 13F managers | Share of the company (upper bound) | Value declared | Held by stock pickers |
|---|---|---|---|---|
| Q4 2019 | 337 | 95.4% | $5.8B | 67.3% |
| Q4 2020 | 338 | 94.4% | $7.8B | 66.7% |
| Q4 2021 | 389 | 96.4% | $9.3B | 67.0% |
| Q4 2022 | 308 | 101.4% | $5.7B | 70.1% |
| Q4 2023 | 317 | 100.0% | $6.9B | 65.3% |
| Q4 2024 | 414 | 104.7% | $7.4B | 61.7% |
| Q4 2025 | 508 | 105.0% | $11.3B | 60.8% |
| Q2 2026 | 761 | 104.9% | $31.4B | 58.1% |
From SEC Form 13F, every quarter since the end of 2019, read like the current quarter: entities of a house summed, a value contradicting its share count set aside. The share of the company is an upper bound — two managers can declare the same shares — over the shares outstanding at that date.