Latest Period
Q1 2026
Security Snapshot
MKS INC - COMMON STOCK (MKSI) Institutional Ownership
CUSIP: 55306N104
13F Institutional Holders and Ownership History from Q1 2014 to Q1 2026
Institutions Reporting
613
Shares (Excl. Options)
68,946,219
Price
$229.81
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- Type / Class
- Equity / COMMON STOCK
- Symbol
- MKSI on Nasdaq
- Shares outstanding
- 67,999,671
- Price per share
- $319.71
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 68,946,219
- Total reported value
- $15,769,896,723
- % of total 13F portfolios
- 0.02%
- Share change
- -1,364,794
- Value change
- -$193,752,751
- Number of holders
- 613
- Price from insider filings
- $319.71
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors
Key facts
- MKSI - MKS INC - COMMON STOCK is tracked under CUSIP 55306N104.
- 613 institutions reported positions in Q1 2026.
- 8 significant owners is listed from Schedule 13D/13G reporting.
Change
- Holder count moved from 513 to 613 between Q4 2025 and Q1 2026.
- Reported value moved from $11,279,267,107 to $15,769,896,723.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC Evidence
Latest holder context comes from 613 institutions filings for Q1 2026.
Security key
55306N104
Latest holder period
Q1 2026
13F holders
613
13D/G owners
8
CIK / CUSIP context first
Open Q1 2026 holders
MKSI full holder history
MKS INC SEC filings
MKS INC company facts
MKS INC insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 55306N104:
13D/G owners
Significant owners
Large-stake holder rows connected to Schedule 13D/G evidence.
Rows
8
Security
MKSI
| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| BlackRock, Inc. | 8.8% | $728,716,050 | 5,887,663 | BlackRock, Inc. | 30 Sep 2025 | |||
| Invesco Ltd. | 6.5% | $806,336,618 | 4,394,205 | Invesco Ltd. | 31 Dec 2025 | |||
| VICTORY CAPITAL MANAGEMENT INC | 5.6% | $381,446,885 | 3,787,201 | Victory Capital Management, Inc. | 30 Jun 2025 | |||
| VANGUARD PORTFOLIO MANAGEMENT LLC | 5.5% | $850,311,248 | 3,700,062 | Vanguard Portfolio Management | 31 Mar 2026 | |||
| VANGUARD CAPITAL MANAGEMENT LLC | 5.2% | $810,961,801 | 3,528,836 | Vanguard Capital Management | 31 Mar 2026 | |||
| Capital International Investors | 4.7% | $225,778,190 | 3,160,389 | Capital International Investors | 30 Sep 2024 | |||
| PRICE T ROWE ASSOCIATES INC /MD/ | 4.1% | -35% | $505,335,328 | -$252,359,660 | 2,753,871 | -33% | T. Rowe Price Associates, Inc. | 31 Dec 2025 |
| FMR LLC | 3.3% | $613,012,951 | 2,243,989 | FMR LLC | 31 Mar 2026 |
As of 31 Mar 2026, 613 institutional investors reported holding 68,946,219 shares of MKS INC - COMMON STOCK (MKSI). This represents 101% of the company’s total 67,999,671 outstanding shares.
13F concentration
Top 25 institutional shareholders
Largest 13F positions for this security by reported shares and value.
Top holder share
66%
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| BlackRock, Inc. | 9.8% | 6,641,730 | +8.2% | 0.03% | $1,526,335,861 |
| Invesco Ltd. | 5.5% | 3,721,459 | -3.5% | 0.13% | $855,228,394 |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 5.4% | 3,685,493 | 0% | 0.04% | $846,963,146 |
| VANGUARD CAPITAL MANAGEMENT LLC | 4.4% | 3,014,201 | 0% | 0.02% | $692,693,532 |
| JPMORGAN CHASE & CO | 3.1% | 2,096,342 | +35% | 0.03% | $441,217,278 |
| STATE STREET CORP | 3% | 2,057,732 | +2% | 0.02% | $472,887,391 |
| Capital International Investors | 2.9% | 1,968,770 | -39% | 0.11% | $452,443,034 |
| FMR LLC | 2.8% | 1,933,843 | -40% | 0.02% | $444,416,544 |
| WELLINGTON MANAGEMENT GROUP LLP | 2.7% | 1,833,137 | -28% | 0.08% | $421,273,215 |
| PRICE T ROWE ASSOCIATES INC /MD/ | 2.5% | 1,700,148 | -38% | 0.05% | $390,712,000 |
| Point72 Asset Management, L.P. | 2.4% | 1,610,331 | +157% | 0.64% | $370,070,167 |
| GEODE CAPITAL MANAGEMENT, LLC | 2.3% | 1,539,319 | +23% | 0.02% | $353,818,861 |
| Aspex Management (HK) Ltd | 2.3% | 1,538,789 | 5.1% | $353,629,000 | |
| NEUBERGER BERMAN GROUP LLC | 2.1% | 1,433,529 | -1.9% | 0.25% | $329,439,399 |
| Whale Rock Capital Management LLC | 1.9% | 1,306,724 | 3.9% | $300,298,242 | |
| Capital World Investors | 1.9% | 1,277,200 | 0.04% | $293,513,332 | |
| WESTFIELD CAPITAL MANAGEMENT CO LP | 1.5% | 1,046,763 | +25% | 1% | $240,556,578 |
| CITADEL ADVISORS LLC | 1.4% | 947,032 | +107% | 0.15% | $217,637,424 |
| MILLENNIUM MANAGEMENT LLC | 1.3% | 894,369 | +9.4% | 0.15% | $205,534,940 |
| VICTORY CAPITAL MANAGEMENT INC | 1.3% | 878,758 | -66% | 0.13% | $201,947,376 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 1.3% | 866,647 | -0.46% | 0.03% | $199,164,147 |
| DIMENSIONAL FUND ADVISORS LP | 1.2% | 835,345 | -25% | 0.04% | $191,879,336 |
| Bank of New York Mellon Corp | 1.2% | 832,150 | +5.5% | 0.04% | $191,236,622 |
| AQR CAPITAL MANAGEMENT LLC | 0.91% | 616,497 | +213% | 0.06% | $136,862,293 |
| PRINCIPAL FINANCIAL GROUP INC | 0.9% | 614,230 | -20% | 0.08% | $141,162,055 |
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
49
Latest
Q1 2026
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 68,946,219 | $15,769,896,723 | -$193,752,751 | $229.81 | 613 |
| 2025 Q4 | 70,547,915 | $11,279,267,107 | -$278,053,181 | $159.80 | 513 |
| 2025 Q3 | 72,009,390 | $8,912,346,556 | -$247,110,462 | $123.77 | 432 |
| 2025 Q2 | 74,656,256 | $7,417,760,692 | +$501,510,755 | $99.36 | 391 |
| 2025 Q1 | 70,604,374 | $5,654,976,915 | +$15,984,881 | $80.15 | 390 |
| 2024 Q4 | 70,469,090 | $7,360,920,393 | +$163,297,205 | $104.39 | 416 |
| 2024 Q3 | 67,801,071 | $7,370,645,916 | -$175,427,802 | $108.71 | 405 |
| 2024 Q2 | 69,059,487 | $9,023,696,771 | +$20,371,519 | $130.58 | 393 |
| 2024 Q1 | 68,945,423 | $9,157,146,718 | +$298,920,133 | $133.00 | 336 |
| 2023 Q4 | 66,915,706 | $6,883,792,520 | +$74,542,820 | $102.87 | 322 |
| 2023 Q3 | 67,016,612 | $5,797,022,331 | -$98,537,748 | $86.54 | 320 |
| 2023 Q2 | 67,793,825 | $7,320,534,717 | +$83,578,503 | $108.10 | 318 |
| 2023 Q1 | 67,091,933 | $5,943,332,893 | -$31,005,207 | $88.62 | 320 |
| 2022 Q4 | 67,488,362 | $5,740,811,738 | +$777,783,941 | $84.73 | 310 |
| 2022 Q3 | 58,488,300 | $4,841,875,867 | +$414,649,121 | $82.64 | 340 |
| 2022 Q2 | 53,123,303 | $5,449,916,038 | -$71,616,252 | $102.63 | 361 |
| 2022 Q1 | 53,950,167 | $8,057,424,746 | +$9,162,472 | $150.00 | 383 |
| 2021 Q4 | 53,647,275 | $9,337,726,302 | +$135,642,019 | $174.17 | 399 |
| 2021 Q3 | 52,553,176 | $7,929,920,269 | +$42,671,310 | $150.91 | 365 |
| 2021 Q2 | 52,084,245 | $9,266,889,055 | -$156,963,648 | $177.95 | 366 |
| 2021 Q1 | 53,005,490 | $9,827,292,725 | +$175,330,067 | $185.42 | 345 |
| 2020 Q4 | 52,082,426 | $7,837,018,243 | +$71,934,035 | $150.45 | 339 |
| 2020 Q3 | 51,806,716 | $5,662,007,337 | -$106,289,181 | $109.23 | 327 |
| 2020 Q2 | 52,725,910 | $5,972,142,259 | -$137,548,110 | $113.24 | 309 |
| 2020 Q1 | 54,018,372 | $4,400,202,816 | +$82,076,417 | $81.45 | 296 |
| 2019 Q4 | 52,685,982 | $5,795,928,320 | -$179,043,053 | $110.01 | 342 |
| 2019 Q3 | 54,109,549 | $4,993,385,895 | +$170,440,918 | $92.28 | 292 |
| 2019 Q2 | 52,504,189 | $4,090,510,705 | +$80,253,517 | $77.89 | 301 |
| 2019 Q1 | 52,307,959 | $4,865,302,244 | +$241,488,461 | $93.05 | 324 |
| 2018 Q4 | 50,153,477 | $3,239,577,698 | -$19,868,131 | $64.61 | 338 |
| 2018 Q3 | 50,277,371 | $4,028,173,297 | -$77,098,738 | $80.15 | 377 |
| 2018 Q2 | 50,930,841 | $4,872,663,487 | -$116,765,898 | $95.70 | 382 |
| 2018 Q1 | 51,830,820 | $5,991,456,911 | +$140,227,515 | $115.65 | 388 |
| 2017 Q4 | 51,372,716 | $4,854,068,641 | -$126,172,442 | $94.50 | 354 |
| 2017 Q3 | 52,247,222 | $4,935,175,550 | +$15,899,965 | $94.45 | 336 |
| 2017 Q2 | 52,101,232 | $3,510,067,554 | -$71,640,225 | $67.30 | 312 |
| 2017 Q1 | 53,712,589 | $3,694,099,495 | +$311,720,466 | $68.75 | 284 |
| 2016 Q4 | 55,488,684 | $3,296,305,677 | +$262,781 | $59.40 | 267 |
| 2016 Q3 | 55,562,664 | $2,761,653,392 | +$20,272,404 | $49.73 | 242 |
| 2016 Q2 | 55,285,484 | $2,382,069,687 | +$89,671,190 | $43.06 | 206 |
| 2016 Q1 | 52,713,601 | $1,985,077,961 | +$23,827,495 | $37.65 | 203 |
| 2015 Q4 | 52,832,827 | $1,902,401,980 | +$4,055,175 | $36.00 | 183 |
| 2015 Q3 | 53,328,510 | $1,788,081,539 | +$9,288,697 | $33.53 | 200 |
| 2015 Q2 | 52,902,839 | $2,006,995,250 | +$23,222,207 | $37.94 | 197 |
| 2015 Q1 | 52,323,808 | $1,769,179,621 | -$3,877,059 | $33.81 | 193 |
| 2014 Q4 | 52,448,772 | $1,919,418,691 | -$41,616,717 | $36.60 | 181 |
| 2014 Q3 | 53,596,339 | $1,789,044,115 | -$23,521,665 | $33.38 | 162 |
| 2014 Q2 | 54,369,786 | $1,698,780,873 | +$21,678,002 | $31.24 | 156 |
| 2014 Q1 | 53,680,587 | $1,603,720,460 | +$38,279,294 | $29.89 | 149 |