Company · Ownership research

MONOLITHIC POWER SYSTEMS, INC. MPWR

CIK 0001280452 · CUSIP 609839105

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 609839105 (MPWR), not CUSIP 609839905 (MPWR), CUSIP 609839955 (MPWR), and does not merge CUSIPs.

This page lists the top 20 of 1,123 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	$6.64B 6,072,467 shares	0.12%	+110.08K(+1.80%)Added	SEC filing ↗ May 13, 2026	▾
02	FMR LLC CIK 315066 · View history	$4.81B 4,400,831 shares	0.25%	+423.82K(+10.70%)Added	SEC filing ↗ May 15, 2026	▾
03	VANGUARD CAPITAL MANAGEMENT LLC CIK 2100119 · Amended · View history	$3.37B 3,083,449 shares	0.08%	—	SEC filing ↗ May 15, 2026	▾
04	VANGUARD PORTFOLIO MANAGEMENT LLC CIK 2100121 · Amended · View history	$2.75B 2,516,492 shares	0.14%	—	SEC filing ↗ May 8, 2026	▾
05	Invesco Ltd. CIK 914208 · Amended · View history	$2.75B 2,515,987 shares	0.27%	+5.01K(+0.20%)Added	SEC filing ↗SEC filing ↗ May 12, 2026	▾
06	STATE STREET CORP CIK 93751 · View history	$2.40B 2,188,454 shares	0.08%	+8.04K(+0.40%)Added	SEC filing ↗ May 15, 2026	▾
07	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$1.56B 1,432,066 shares	0.10%	+49.79K(+3.60%)Added	SEC filing ↗ May 15, 2026	▾
08	PRICE T ROWE ASSOCIATES INC /MD/ CIK 80255 · View history	$1.38B 1,262,954 shares	0.16%	-428.44K(-25.30%)Reduced	SEC filing ↗ May 15, 2026	▾
09	FRANKLIN RESOURCES INC CIK 38777 · View history	$1.02B 928,671 shares	0.25%	-120.74K(-11.50%)Reduced	SEC filing ↗ May 13, 2026	▾
10	T. Rowe Price Investment Management, Inc. CIK 1897612 · View history	$788.99M 721,622 shares	0.54%	-2.87K(-0.40%)Reduced	SEC filing ↗ May 15, 2026	▾
11	MORGAN STANLEY CIK 895421 · View history	$717.64M 656,367 shares	0.04%	+7.30K(+1.10%)Added	SEC filing ↗ May 15, 2026	▾
12	FIRST TRUST ADVISORS LP CIK 1125816 · View history	$646.56M 591,353 shares	0.46%	-110.10K(-15.70%)Reduced	SEC filing ↗ May 13, 2026	▾
13	GOLDMAN SACHS GROUP INC CIK 886982 · View history	$621.09M 568,064 shares	0.08%	-25.68K(-4.30%)Reduced	SEC filing ↗ May 15, 2026	▾
14	MASSACHUSETTS FINANCIAL SERVICES CO /MA/ CIK 912938 · View history	$620.75M 567,769 shares	0.21%	-2.95K(-0.50%)Reduced	SEC filing ↗ May 14, 2026	▾
15	BARCLAYS PLC CIK 312069 · View history	$607.69M 555,808 shares	0.22%	-48.99K(-8.10%)Reduced	SEC filing ↗ May 15, 2026	▾
16	UBS Group AG CIK 1610520 · View history	$590.86M 540,413 shares	0.10%	+101.43K(+23.10%)Added	SEC filing ↗ May 5, 2026	▾
17	VAN ECK ASSOCIATES CORP CIK 869178 · View history	$573.54M 524,571 shares	0.43%	+22.26K(+4.40%)Added	SEC filing ↗ May 15, 2026	▾
18	JPMORGAN CHASE & CO CIK 19617 · Amended · View history	$556.22M 554,919 shares	0.04%	+42.65K(+8.30%)Added	SEC filing ↗ May 13, 2026	▾
19	NORTHERN TRUST CORP CIK 73124 · View history	$534.78M 489,120 shares	0.07%	+5.42K(+1.10%)Added	SEC filing ↗ May 14, 2026	▾
20	ROYAL BANK OF CANADA CIK 1000275 · View history	$517.56M 473,368 shares	0.10%	+296.79K(+168.10%)Added	SEC filing ↗ May 15, 2026	▾

Showing 20 / 1,123 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

1,123

Cancelled or null records excluded

Disclosed shares

47,261,632

Not deduplicated across managers

Disclosed value

$51.56B

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.

MONOLITHIC POWER SYSTEMS, INC. · Q1 2026

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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.