Company · Ownership research

MKS INC MKSI

CIK 0001049502 · CUSIP 55306N104

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 55306N104 (MKSI), not CUSIP 55306N904 (MKSI), CUSIP 55306N954 (MKSI), and does not merge CUSIPs.

This page lists the top 20 of 519 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	VANGUARD GROUP INC CIK 102909 · View history	$1.20B 7,487,305 shares	0.02%	-264.79K(-3.40%)Reduced	SEC filing ↗ Jan 29, 2026	▾
02	BlackRock, Inc. CIK 2012383 · View history	$980.99M 6,138,839 shares	0.02%	+15.51K(+0.30%)Added	SEC filing ↗ Feb 12, 2026	▾
03	Invesco Ltd. CIK 914208 · Amended · View history	$616.11M 3,855,511 shares	0.06%	+1.47M(+61.80%)Added	SEC filing ↗ Feb 19, 2026	▾
04	Capital International Investors CIK 1562230 · View history	$517.63M 3,239,230 shares	0.08%	-15.43K(-0.50%)Reduced	SEC filing ↗ Feb 11, 2026	▾
05	FMR LLC CIK 315066 · View history	$511.09M 3,198,335 shares	0.03%	-244.93K(-7.10%)Reduced	SEC filing ↗ Feb 17, 2026	▾
06	PRICE T ROWE ASSOCIATES INC /MD/ CIK 80255 · View history	$440.07M 2,753,850 shares	0.05%	-879.17K(-24.20%)Reduced	SEC filing ↗ Feb 17, 2026	▾
07	VICTORY CAPITAL MANAGEMENT INC CIK 1040188 · View history	$409.47M 2,562,399 shares	0.23%	-1.02M(-28.50%)Reduced	SEC filing ↗ Feb 13, 2026	▾
08	WELLINGTON MANAGEMENT GROUP LLP CIK 902219 · View history	$407.81M 2,552,021 shares	0.07%	-461.77K(-15.30%)Reduced	SEC filing ↗ Feb 17, 2026	▾
09	STATE STREET CORP CIK 93751 · View history	$322.41M 2,017,590 shares	0.01%	-26.37K(-1.30%)Reduced	SEC filing ↗ Feb 13, 2026	▾
10	JPMORGAN CHASE & CO CIK 19617 · View history	$247.92M 1,551,443 shares	0.02%	+886.85K(+133.40%)Added	SEC filing ↗ Feb 11, 2026	▾
11	NEUBERGER BERMAN GROUP LLC CIK 1465109 · Amended · View history	$233.50M 1,461,189 shares	0.17%	-173.61K(-10.60%)Reduced	SEC filing ↗ Oct 27, 2026	▾
12	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$200.44M 1,254,049 shares	0.01%	+5.55K(+0.40%)Added	SEC filing ↗ Feb 9, 2026	▾
13	DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history	$178.58M 1,117,487 shares	0.04%	-147.88K(-11.70%)Reduced	SEC filing ↗ Feb 12, 2026	▾
14	FRANKLIN RESOURCES INC CIK 38777 · View history	$166.47M 1,041,725 shares	0.04%	-367.23K(-26.10%)Reduced	SEC filing ↗ Feb 11, 2026	▾
15	COOKE & BIELER LP CIK 24386 · View history	$154.48M 966,703 shares	1.61%	-355.17K(-26.90%)Reduced	SEC filing ↗ Feb 9, 2026	▾
16	NORGES BANK CIK 1374170 · View history	$147.45M 922,737 shares	0.02%	+922.74KNew	SEC filing ↗ Feb 10, 2026	▾
17	Madison Asset Management, LLC CIK 1299351 · View history	$147.25M 921,450 shares	1.69%	-54.64K(-5.60%)Reduced	SEC filing ↗ Feb 4, 2026	▾
18	CHARLES SCHWAB INVESTMENT MANAGEMENT INC CIK 884546 · View history	$139.13M 870,654 shares	0.02%	+24.35K(+2.90%)Added	SEC filing ↗ Feb 13, 2026	▾
19	WESTFIELD CAPITAL MANAGEMENT CO LP CIK 1177719 · View history	$134.20M 839,773 shares	0.56%	+516.41K(+159.70%)Added	SEC filing ↗ Feb 11, 2026	▾
20	MILLENNIUM MANAGEMENT LLC CIK 1273087 · View history	$130.60M 817,251 shares	0.09%	+371.00K(+83.10%)Added	SEC filing ↗ Feb 17, 2026	▾

Showing 20 / 519 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

519

Cancelled or null records excluded

Disclosed shares

70,550,047

Not deduplicated across managers

Disclosed value

$11.28B

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

MKS INC · Q4 2025

Explore all 519 reporting institutions.

This page includes 20 of 519 reporting institutions. Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.