Security Snapshot

MKS INC - Common Stock, no par value (MKSI) Institutional Ownership

CUSIP: 55306N104

13F Institutional Holders and Ownership History from Q1 2014 to Q3 2026

13F reference period

Q2 2026

Institutions Reporting

778

Shares (Excl. Options)

70.92MFull value: 70,915,540 · shares · 30 Jun 2026

Price

$444.80

The headline uses the Q2 2026 reference period after its reporting deadline. Available reports may still be incomplete or amended. Newer periods in the history table contain incoming reports and may be incomplete.

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Security type / class
Equity / Common Stock, no par value
Symbol
MKSI on Nasdaq
All holders as of 30 Jun 2026
Q2 2026
Total 13F shares
70,915,540
Latest holder snapshot 5 signals
Total 13F value
$31,356,266,836
Portfolio coverage rank
0.03%
Share change
+1,997,622
Value change
+$1,081,588,052
Number of holders
778
Issuer context Names, identifiers, and filing context for this profile. 3 identity fields
Shares outstanding
69,164,000
SEC-reported price per share
$265.36
Insider filing price
$265.36
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Filing notes and source

Key facts

  • MKSI - MKS INC - Common Stock, no par value is tracked under CUSIP 55306N104.
  • 778 institutions reported positions in Q2 2026.
  • 9 significant owners is listed from Schedule 13D/13G reporting.

Change

  • Holder count moved from 621 to 778 between Q1 2026 and Q2 2026.
  • SEC-reported value moved from
    $15.78BFull value: $15,780,420,554 · USD · 31 Mar 2026
    to
    $31.36BFull value: $31,356,266,836 · USD · 30 Jun 2026
    .

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

Latest holder context comes from 778 institutions filings for Q2 2026.

Open SEC evidence

Security key

55306N104

13F reference period

Q2 2026

13F holders

778

13D/G owners

9

CIK / CUSIP context first

Open Q2 2026 holders MKSI full holder history MKS INC SEC filings MKS INC company facts MKS INC insider transactions

Broader feeds

Latest 13F filings Latest 13D/G filings All securities

13D/G owners

Significant owners

Large-stake holder rows connected to Schedule 13D/G evidence.

Rows
9
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
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
JPMORGAN CHASE & CO 2.9% -42% $643,366,295 -$452,858,270 2,005,756 -41% JPMORGAN CHASE & CO. 31 Aug 2026
VICTORY CAPITAL MANAGEMENT INC 0.9% -79% $268,966,112 -$1,415,580,893 604,690 -84% Victory Capital Management, Inc. 30 Jun 2026
As of 30 Jun 2026, 778 institutional investors reported holding
70.92MFull value: 70,915,540 · shares · 30 Jun 2026
shares of MKS INC - Common Stock, no par value (MKSI). This represents 103% of the company’s total
69.16MFull value: 69,164,000 · shares · Stored outstanding share count
outstanding shares.

13F concentration

Top 25 institutional shareholders

Largest 13F positions for this security by reported shares and value.

Top holder share
68%
Institution Ownership % Shares Held Share Change % Portfolio % Holdings Value
BlackRock, Inc. 10% 6,930,030 +4.3% 0.05% $3,082,477,430
Invesco Ltd. 6.7% 4,661,664 +25% 0.16% $2,073,508,050
VANGUARD PORTFOLIO MANAGEMENT LLC 5.4% 3,707,327 +0.59% 0.07% $1,649,019,050
JPMORGAN CHASE & CO 4.9% 3,373,844 +61% 0.08% $1,404,811,557
VANGUARD CAPITAL MANAGEMENT LLC 4.4% 3,049,560 +1.2% 0.03% $1,356,444,288
STATE STREET CORP 3.1% 2,134,663 +3.7% 0.03% $949,439,264
Point72 Asset Management, L.P. 2.9% 1,996,843 +24% 1.4% $888,195,766
Capital International Investors 2.8% 1,915,187 -2.7% 0.18% $851,875,178
PRICE T ROWE ASSOCIATES INC /MD/ 2.7% 1,889,901 +11% 0.08% $840,629,000
Aspex Management (HK) Ltd 2.6% 1,820,441 +18% 9.1% $809,732,000
GEODE CAPITAL MANAGEMENT, LLC 2.2% 1,539,072 -0.02% 0.04% $686,574,757
FMR LLC 2.2% 1,499,498 -22% 0.03% $666,976,512
WELLINGTON MANAGEMENT GROUP LLP 2% 1,416,034 -23% 0.11% $629,851,923
Capital World Investors 2% 1,366,290 +7% 0.07% $607,725,792
Whale Rock Capital Management LLC 1.8% 1,271,373 -2.7% 4.5% $565,506,710
NEUBERGER BERMAN GROUP LLC 1.7% 1,165,068 -19% 0.35% $518,222,089
ALKEON CAPITAL MANAGEMENT LLC 1.5% 1,072,040 1.8% $476,843,392
NORGES BANK 1.4% 954,667 0.04% $424,635,882
WESTFIELD CAPITAL MANAGEMENT CO LP 1.3% 928,617 -11% 1.3% $413,048,645
Sachem Head Capital Management LP 1.2% 812,700 7.5% $361,488,960
CHARLES SCHWAB INVESTMENT MANAGEMENT INC 1.2% 808,198 -6.7% 0.05% $359,486,470
CITADEL ADVISORS LLC 1% 697,670 -26% 0.18% $310,323,616
MORGAN STANLEY 0.99% 681,576 +32% 0.02% $303,166,053
Bank of New York Mellon Corp 0.95% 658,544 -21% 0.05% $292,920,852
MILLENNIUM MANAGEMENT LLC 0.93% 645,071 -28% 0.19% $286,927,581

Quarter history

Institutional holders across reporting periods

Holder count, reported shares/value, and median price by quarter.

Periods
51
Headline period
Q2 2026
Rows shown
1-25 of 51
Period 13F Shares, Excl. Options Value, Excl. Options Value Change Price (Median) Investors
2026 Q3 1,886,045 $499,975,591 +$160,972,687 $265.36 169
2026 Q2 70,915,540 $31,356,266,836 +$1,081,588,052 $444.80 778
2026 Q1 68,992,014 $15,780,420,554 -$188,209,903 $229.81 621
2025 Q4 70,547,926 $11,279,268,865 -$278,053,181 $159.80 514
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
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