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MONOLITHIC PWR SYS INC (MPWR)

Name: MONOLITHIC PWR SYS INC (MPWR) — Institutional ownership, SEC filings and insider activity
Creator: Sightfile
License: https://www.sec.gov/privacy#dissemination

Institutional ownership, SEC filings and insider activity

Sector: Technology · SEC CIK 0001280452 · EDGAR filings · Updated 2026-07-28

MONOLITHIC PWR SYS INC (MPWR) has reported institutional ownership of 94.0%, with 1,110 institutional managers holding positions valued at $50.4B per the latest 13F reporting period. SEC filings include an active non-reliance notice on previously issued financial statements (8-K Item 4.02).

Institutional ownership

94.0%

Institutional managers

1,110

Reported 13F value

$50.4B

Insider activity

301 trans.

−$552.2M net selling

Data flags

1 active

from SEC filings

Filings this week (1)

2026-07-28 — Insider transaction reported (Form 4)

Every filing links to the official SEC document. Real-time filing alerts for this company are available inside the app.

Latest updates

2026-07-17 — Insider transaction reported (Form 4)
2026-07-15 — Notice of proposed sale filed (Form 144)
2026-07-15 — SCHEDULE 13G filed
2026-07-08 — SCHEDULE 13G/A filed
2026-07-06 — Insider transaction reported (Form 4)
2026-06-12 — Current report (8-K) filed
2026-06-03 — Insider transaction reported (Form 4)
2026-06-02 — Insider transaction reported (Form 4)

Institutional ownership overview

According to SEC 13F filings tracked by Sightfile, MONOLITHIC PWR SYS INC has 1,110 institutional holders and institutional ownership of 94.0%.

#	Institution	Reported value	% of tracked total
1	BlackRock, Inc.	$6.64B	13.2%
2	FMR LLC	$4.81B	9.6%
3	VANGUARD CAPITAL MANAGEMENT LLC	$3.37B	6.7%
4	VANGUARD PORTFOLIO MANAGEMENT LLC	$2.75B	5.5%
5	STATE STREET CORP	$2.40B	4.8%
6	Invesco Ltd.	$1.62B	3.2%
7	GEODE CAPITAL MANAGEMENT, LLC	$1.56B	3.1%
8	PRICE T ROWE ASSOCIATES INC /MD/	$1.38B	2.7%
9	FRANKLIN RESOURCES INC	$1.02B	2.0%
10	T. Rowe Price Investment Management, Inc.	$789.0M	1.6%

Full holder history and quarter-over-quarter changes are available inside the app.

Insider activity

Insiders reported 301 transactions (0 buys, 262 sells) across 12 reporting insiders, with a net reported value of −$552.2M.

Quarterly net insider value, as reported in Form 4 filings.

Data flags from SEC filings

Active non-reliance notice on previously issued financial statements (8-K Item 4.02), most recently filed 2026-02-27 (recurring since 2026-02-27) — source filing. The authoritative details are those stated in the filing itself.

Fails-to-deliver

The SEC's fails-to-deliver file for 2026-06-30 reports 7,906 failed-to-deliver shares ($10.4M) for MPWR — an official data point published by the SEC, shown as reported.

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See full history, cross-references and alerts on Sightfile

Sightfile provides information only — not investment advice, recommendations, or an assessment of any security. Data is derived from official public sources (SEC EDGAR and U.S. government agencies), may contain errors or delays, and should be verified against the source filing before relying on it.
Data sources: SEC EDGAR (filings, 13F, FTD), aggregated by Sightfile. Page updated 2026-07-28.