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 627 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	BlackRock, Inc. CIK 2012383 · View history	$1.53B 6,641,730 shares	0.03%	+502.89K(+8.20%)Added	SEC filing ↗ May 13, 2026	▾
02	Invesco Ltd. CIK 914208 · Amended · View history	$855.23M 3,721,459 shares	0.08%	-134.05K(-3.50%)Reduced	SEC filing ↗ May 12, 2026	▾
03	VANGUARD PORTFOLIO MANAGEMENT LLC CIK 2100121 · Amended · View history	$846.96M 3,685,493 shares	0.04%	—	SEC filing ↗ May 8, 2026	▾
04	VANGUARD CAPITAL MANAGEMENT LLC CIK 2100119 · Amended · View history	$692.69M 3,014,201 shares	0.02%	—	SEC filing ↗ May 15, 2026	▾
05	STATE STREET CORP CIK 93751 · View history	$472.89M 2,057,732 shares	0.02%	+40.14K(+2.00%)Added	SEC filing ↗ May 15, 2026	▾
06	Capital International Investors CIK 1562230 · View history	$452.44M 1,968,770 shares	0.11%	-1.27M(-39.20%)Reduced	SEC filing ↗ May 13, 2026	▾
07	FMR LLC CIK 315066 · View history	$444.42M 1,933,843 shares	0.02%	-1.26M(-39.50%)Reduced	SEC filing ↗ May 15, 2026	▾
08	JPMORGAN CHASE & CO CIK 19617 · Amended · View history	$441.22M 2,096,342 shares	0.03%	+544.90K(+35.10%)Added	SEC filing ↗ May 13, 2026	▾
09	WELLINGTON MANAGEMENT GROUP LLP CIK 902219 · View history	$421.27M 1,833,137 shares	0.08%	-718.88K(-28.20%)Reduced	SEC filing ↗ May 15, 2026	▾
10	PRICE T ROWE ASSOCIATES INC /MD/ CIK 80255 · View history	$390.71M 1,700,148 shares	0.05%	-1.05M(-38.30%)Reduced	SEC filing ↗ May 15, 2026	▾
11	Point72 Asset Management, L.P. CIK 1603466 · View history	$370.07M 1,610,331 shares	0.64%	+984.53K(+157.30%)Added	SEC filing ↗ May 15, 2026	▾
12	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$353.82M 1,539,319 shares	0.02%	+285.27K(+22.70%)Added	SEC filing ↗ May 15, 2026	▾
13	Aspex Management (HK) Ltd CIK 1768375 · View history	$353.63M 1,538,789 shares	5.13%	+1.54MNew	SEC filing ↗ May 15, 2026	▾
14	NEUBERGER BERMAN GROUP LLC CIK 1465109 · Amended · View history	$329.44M 1,433,529 shares	0.25%	-27.66K(-1.90%)Reduced	SEC filing ↗ Oct 27, 2026	▾
15	Whale Rock Capital Management LLC CIK 1387322 · View history	$300.30M 1,306,724 shares	3.88%	+1.31MNew	SEC filing ↗ May 15, 2026	▾
16	Capital World Investors CIK 1422849 · View history	$293.51M 1,277,200 shares	0.04%	+1.28MNew	SEC filing ↗ May 13, 2026	▾
17	WESTFIELD CAPITAL MANAGEMENT CO LP CIK 1177719 · View history	$240.56M 1,046,763 shares	1.01%	+206.99K(+24.60%)Added	SEC filing ↗ May 11, 2026	▾
18	CITADEL ADVISORS LLC CIK 1423053 · View history	$217.64M 947,032 shares	0.15%	+489.16K(+106.80%)Added	SEC filing ↗ May 15, 2026	▾
19	MILLENNIUM MANAGEMENT LLC CIK 1273087 · View history	$205.53M 894,369 shares	0.15%	+77.12K(+9.40%)Added	SEC filing ↗ May 15, 2026	▾
20	VICTORY CAPITAL MANAGEMENT INC CIK 1040188 · View history	$201.95M 878,758 shares	0.13%	-1.68M(-65.70%)Reduced	SEC filing ↗ May 15, 2026	▾

Showing 20 / 627 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

627

Cancelled or null records excluded

Disclosed shares

69,002,078

Not deduplicated across managers

Disclosed value

$15.78B

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 · Q1 2026

Explore all 627 reporting institutions.

This page includes 20 of 627 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.