MKSI — MKS INSTRS INC
As of Q2 2026, 45 SEC-registered investment managers reported holding MKSI (MKS INSTRS INC) in their latest 13F filings, with a combined reported value of $6.57B across 225.62M shares. That is -21.0% by share count (-60.12M shares) versus the previous quarter, while reported value moved +134.9%. Ownership is concentrated: the five largest holders account for 49.1% of reported value and the top ten for 75.0%.
Compared with the prior quarter, 3 opened new positions, 14 added to existing stakes, 24 trimmed, 2 exited entirely. 13F holdings are quarter-end snapshots, so these moves reflect positioning as of Q2 2026, not real-time trading.
MKSI is classified in the Industrials sector.
All figures on this page are computed from SEC Form 13F quarterly filings. 13F filers disclose long positions of $100,000 or more within 45 days of quarter end; short positions, options overlays and intra-quarter trades are not included, so treat the numbers as a quarterly snapshot of institutional ownership rather than real-time positioning.
| Fund | Quarter | Shares | Value | Portfolio Weight | Change |
|---|---|---|---|---|---|
| Vanguard Group history | Q4 2025 | 7.49M | $1.20B | 0.02% | Reduce |
| Point72 Asset Management history | Q2 2026 | 2.00M | $890.20M | 1.03% | Reduce |
| Geode Capital Management history | Q2 2026 | 1.54M | $686.57M | 0.04% | Hold |
| Capital World Investors history | Q2 2026 | 1.37M | $607.73M | 0.08% | Add |
| Whale Rock Capital Management history | Q2 2026 | 1.27M | $565.51M | 4.55% | Reduce |
| Alkeon Capital Management history | Q2 2026 | 1.07M | $476.84M | 0.64% | New |
| Norges Bank Investment Management history | Q2 2026 | 954.67K | $424.64M | 0.04% | Add |
| Citadel Advisors history | Q2 2026 | 850.27K | $378.20M | 0.04% | Reduce |
| Charles Schwab Investment Management history | Q2 2026 | 808.20K | $359.49M | 0.05% | Reduce |
| AQR Capital Management history | Q2 2026 | 638.33K | $280.24M | 0.10% | Add |
| Northern Trust Corp history | Q2 2026 | 577.87K | $257.03M | 0.03% | Add |
| Bank of America Corp history | Q2 2026 | 520.85K | $231.67M | 0.01% | Reduce |
| Principal Global Investors history | Q2 2026 | 474.69K | $211.09M | 0.10% | Reduce |
| Davidson Kempner Capital Management history | Q2 2026 | 49.50M | $145.71M | 1.93% | Add |
| Fidelity Management & Research (FMR) history | Q2 2026 | 44.03M | $129.60M | 0.01% | Reduce |
| Royce & Associates history | Q2 2026 | 261.57K | $116.35M | 0.94% | Reduce |
| Balyasny Asset Management history | Q2 2026 | 260.18K | $115.73M | 0.15% | Reduce |
| BlackRock Inc history | Q2 2026 | 34.20M | $100.68M | 0.00% | Add |
| Marshall Wace history | Q2 2026 | 225.12K | $100.13M | 0.08% | Add |
| Two Sigma Investments history | Q2 2026 | 146.76K | $65.28M | 0.05% | Reduce |
New Positions (Q2 2026)
- Alkeon Capital Management 1.07M sh · $476.84M
- JPMorgan Chase & Co 14.56M sh · $40.34M
- MFS Investment Management 49.85K sh · $22.17M
Fully Exited (vs previous quarter)
- Janus Henderson Group sold 30.37K sh · $6.98M
- Moore Capital Management sold 10.00K sh · $2.30M
Fund Position History — shares by quarter (top 20 funds)
| Fund | Q3 2021 | Q4 2021 | Q1 2022 | Q2 2022 | Q3 2022 | Q4 2022 | Q1 2023 | Q2 2023 | Q3 2023 | Q4 2023 | Q1 2024 | Q2 2024 | Q3 2024 | Q4 2024 | Q1 2025 | Q2 2025 | Q3 2025 | Q4 2025 | Q1 2026 | Q2 2026 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Point72 Asset Management | — | — | — | — | — | — | — | 32.70K | — | — | — | 12.24K | 172.38K | 321.54K | 359.89K | — | 1.01M | 8.50M | 10.00M | 2.00M |
| Geode Capital Management | 744.97K | 758.75K | 779.43K | 791.28K | 812.77K | 843.99K | 855.74K | 932.53K | 1.01M | 1.04M | 1.09M | 1.12M | 1.17M | 1.17M | 1.22M | 1.26M | 1.25M | 1.25M | 1.54M | 1.54M |
| Capital World Investors | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1.28M | 1.37M |
| Whale Rock Capital Management | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1.31M | 1.27M |
| Alkeon Capital Management | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1.07M |
| Norges Bank Investment Management | — | — | — | — | — | 877.61K | — | — | — | 1.14M | — | 713.56K | — | 818.58K | — | 859.41K | — | 922.74K | — | 954.67K |
| Citadel Advisors | 102.45K | 54.43K | 58.00K | 280.48K | 85.81K | 105.87K | 159.39K | 211.73K | 111.44K | 100.74K | 87.90K | 119.11K | 144.68K | 85.32K | 122.20K | 219.44K | 225.46K | 546.47K | 1.03M | 850.27K |
| Charles Schwab Investment Management | 497.09K | 510.67K | 459.13K | 460.20K | 488.63K | 510.52K | 514.15K | 521.30K | 586.80K | 597.31K | 612.14K | 617.55K | 663.41K | 666.40K | 718.24K | 790.66K | 846.30K | 870.65K | 866.65K | 808.20K |
| AQR Capital Management | 139.78K | 114.34K | 168.89K | 248.23K | 243.66K | 27.37K | 5.59K | — | 3.60K | 8.34K | 19.60K | 34.33K | 134.93K | 58.81K | 70.21K | 185.05K | 170.00K | 196.66K | 616.50K | 638.33K |
| Northern Trust Corp | 445.49K | 441.40K | 438.03K | 418.74K | 429.78K | 454.02K | 453.98K | 471.55K | 480.72K | 483.90K | 437.58K | 497.09K | 505.12K | 608.38K | 634.20K | 606.88K | 591.90K | 565.99K | 569.22K | 577.87K |
| Bank of America Corp | 194.49K | 274.36K | 295.95K | 299.21K | 218.81K | 200.61K | 351.26K | 164.77K | 221.07K | 324.85K | 650.23K | 644.82K | 876.69K | 707.06K | 681.42K | 982.64K | 1.59M | 9.83M | 5.84M | 520.85K |
| Principal Global Investors | 709.43K | 722.10K | 730.72K | 802.58K | 863.03K | 861.51K | 930.18K | 931.07K | 933.75K | 901.16K | 911.24K | 894.28K | 837.70K | 836.39K | 835.20K | 852.64K | 818.75K | 765.60K | 614.23K | 474.69K |
| Davidson Kempner Capital Management | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 28.00M | 49.50M |
| Fidelity Management & Research (FMR) | 691.55K | 616.81K | 857.61K | 1.06M | 1.20M | 1.56M | 2.77M | 3.13M | 3.46M | 4.05M | 4.01M | 4.44M | 4.31M | 4.22M | 4.04M | 57.18M | 84.81M | 74.77M | 47.86M | 44.03M |
| Royce & Associates | 876.13K | 843.28K | 687.34K | 790.73K | 802.35K | 847.82K | 886.22K | 1.01M | 959.99K | 1.12M | 919.49K | 800.41K | 763.39K | 739.44K | 793.24K | 915.11K | 827.13K | 616.61K | 403.67K | 261.57K |
| Balyasny Asset Management | — | 7.70K | 4.84K | — | — | 166.99K | 8.91K | 29.54K | 45.63K | 195.19K | 133.87K | 321.43K | 324.23K | 99.81K | 494.58K | 732.68K | 850.25K | 511.62K | 407.39K | 260.18K |
| BlackRock Inc | — | — | — | — | — | — | — | — | — | — | — | — | 6.85M | 7.12M | 7.07M | 67.35M | 67.51M | 20.40M | 22.80M | 34.20M |
| Marshall Wace | 91.36K | 1.53K | — | — | — | — | — | — | — | 5.60K | 47.66K | 17.30K | 25.25K | — | — | — | — | — | 98.69K | 225.12K |
| Two Sigma Investments | 194.51K | 8.38K | — | 105.76K | — | 160.12K | 123.48K | 15.80K | 128.68K | 34.18K | 4.30K | 5.00K | — | 42.20K | — | 4.80K | 6.20K | 29.36K | 278.69K | 146.76K |
| Legal & General Investment Management America | 119.31K | 177.40K | 161.36K | 110.84K | 113.69K | 109.98K | 115.98K | 89.31K | 92.47K | 95.48K | 96.82K | 106.32K | 111.53K | 104.64K | 105.18K | 108.29K | 103.42K | 99.59K | 90.02K | 117.82K |
▲ Bought Low (fund opened/added, stock rose ≥5% next quarter) ▼ Sold High (fund reduced, stock fell ≥5% next quarter)
Drag / scroll to zoom · Default shows the most recent year · Annotations come from quarterly fund actions in 13F filings · Hover a marker for details