Public ownership evidence

Monolithic Power Systems, Inc. (MPWR) Ownership Disclosures

Read MPWR insider transactions, institutional 13F filings and Congressional disclosures with report dates, public availability and original receipts.

As of 2026-10-10T12:08:28.848Z

Separate the three disclosure sources

Step 1 of 3

Recent Form 4 activity

Monolithic Power Systems, Inc.: source evidence dated 2026-10-10T12:08:28.848Z.

Available
2026-09-30
Trade date
2026-09-28
Reporting owners
Hsing Michael
Code
S
Shares
130
Reported value
Not reported
What you should see

The displayed owner or issuer and source fields identify the receipt to verify; keep reporting and availability dates separate.

Step 2 of 3

Is this an insider transaction, 13F holding, or Congressional event?

Each source has different dates and units. Raw ticker-matched receipts, including amendments, are not deduplicated current ownership totals.

SEC 0001214659-26-012375
What you should see

Follow the source receipt or manager/member profile. Avoid combining transaction value and 13F position value into an ownership percentage.

Step 3 of 3

Read MPWR fundamentals

Follow the source receipt or manager/member profile. Avoid combining transaction value and 13F position value into an ownership percentage.

Read MPWR fundamentals
What you should see

Keep reporting dates and units beside the answer, and inspect its original citations.

Recent Form 4 activity

See the complete recent form 4 activity

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2026-09-302026-09-28Hsing MichaelS130Not reported
2026-09-302026-09-28Hsing MichaelS10,967Not reported
2026-09-302026-09-28Hsing MichaelS6,343Not reported
2026-09-302026-09-28Hsing MichaelS5,783Not reported
2026-09-302026-09-28Hsing MichaelS2,949Not reported
2026-09-302026-09-28Hsing MichaelS1,111Not reported
2026-09-302026-09-28Hsing MichaelS2,121Not reported
2026-09-302026-09-28Hsing MichaelS596Not reported
2026-08-272026-08-24DEAN ROBERT W IIS32Not reported
2026-08-262026-08-24CHANG KUO WEI HERBERTS50Not reported
2026-08-202026-08-17DEAN ROBERT W IIS6Not reported
2026-08-142026-08-11CHANG KUO WEI HERBERTS50Not reported
2026-08-072026-08-05DEAN ROBERT W IIS105Not reported
2026-08-062026-08-03Sciammas MauriceS30Not reported
2026-07-292026-07-25DEAN ROBERT W IIA1,359Not reported
2026-07-182026-07-15Sciammas MauriceS110Not reported
2026-07-182026-07-15Sciammas MauriceS117Not reported
2026-07-182026-07-15Sciammas MauriceS213Not reported
2026-07-182026-07-15Sciammas MauriceS50Not reported
2026-07-182026-07-15Sciammas MauriceS410Not reported
2026-07-182026-07-15Sciammas MauriceS418Not reported
2026-07-182026-07-15Sciammas MauriceS472Not reported
2026-07-182026-07-15Sciammas MauriceS240Not reported
2026-07-182026-07-15Sciammas MauriceS50Not reported
2026-07-182026-07-15Sciammas MauriceS5,640Not reported
2026-07-182026-07-15Sciammas MauriceS1,506Not reported
2026-07-182026-07-15Sciammas MauriceS1,864Not reported
2026-07-182026-07-15Sciammas MauriceS1,460Not reported
2026-07-182026-07-15Sciammas MauriceS776Not reported
2026-07-182026-07-15Sciammas MauriceS464Not reported
2026-07-182026-07-15Sciammas MauriceS409Not reported
2026-07-182026-07-15Sciammas MauriceS274Not reported
2026-07-182026-07-15Sciammas MauriceS527Not reported

90-day public availability window, up to 50 records.

Recent institutional filing receipts

These are raw ticker-matched positions in recent 13F receipts, including amendments. They are not deduplicated current ownership totals. Open the manager profile to inspect its effective filing book.

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Cornerstone Financial Management LLC2026-06-302026-08-2911$15,206None
Cornerstone Financial Management LLC2026-03-312026-08-295$5,467None
Cornerstone Financial Management LLC2025-12-312026-08-295$4,532None
B. Riley Wealth Advisors, Inc.2025-03-312026-08-29416$241,185None
Advisors Asset Management, Inc.2021-12-312026-08-285,573$2,749,328None
Advisors Asset Management, Inc.2022-12-312026-08-283,664$1,295,627None
Advisors Asset Management, Inc.2020-06-302026-08-2815,566$3,689,142None
Advisors Asset Management, Inc.2022-06-302026-08-284,570$1,755,000None
Advisors Asset Management, Inc.2021-09-302026-08-285,610$2,719,000None
Corient Private Wealth LP2026-06-302026-08-281,024$1,415,992None
Corient Private Wealth LP2026-06-302026-08-2843,062$59,527,634None
Redwood Investment Management, LLC2025-03-312026-08-282,305$1,337,000None
Wellington Grp LLC2026-06-302026-08-27665$919,269None
Principia Wealth Advisory, LLC2026-06-302026-08-2747$64,971None
Principia Wealth Advisory, LLC2026-03-312026-08-2795$103,868None
Advisors Asset Management, Inc.2024-03-312026-08-276,833$4,628,811None
Advisors Asset Management, Inc.2025-03-312026-08-277,075$4,103,359None
Advisors Asset Management, Inc.2022-09-302026-08-274,528$1,645,000None
Advisors Asset Management, Inc.2020-12-312026-08-2715,293$5,601,000None
Advisors Asset Management, Inc.2022-03-312026-08-275,366$2,606,159None
Advisors Asset Management, Inc.2023-06-302026-08-273,869$2,090,150None
Advisors Asset Management, Inc.2023-09-302026-08-274,241$1,959,342None
Advisors Asset Management, Inc.2023-03-312026-08-273,645$1,824,468None
Advisors Asset Management, Inc.2021-03-312026-08-2714,865$5,250,467None
Advisors Asset Management, Inc.2021-06-302026-08-278,838$3,301,000None
Advisors Asset Management, Inc.2020-09-302026-08-2715,641$4,373,380None
Advisors Asset Management, Inc.2025-09-302026-08-274,760$4,382,246None
Advisors Asset Management, Inc.2023-12-312026-08-275,711$3,602,385None
Dakota Wealth Management2025-09-302026-08-273,998$3,681,542None
Dakota Wealth Management2025-12-312026-08-276,218$5,636,172None
Dakota Wealth Management2026-03-312026-08-277,658$8,373,950None
Redwood Investment Management, LLC2025-06-302026-08-271,853$1,355,000None
Groupe la Francaise2026-06-302026-08-262,692$3,721,313None
Advisors Asset Management, Inc.2019-12-312026-08-268,161$1,452,821None
Advisors Asset Management, Inc.2025-06-302026-08-256,318$4,620,859None
Vancity Investment Management Ltd2026-06-302026-08-25470$650,000None
CYBER HORNET ETFs LLC2026-06-302026-08-25132$182,472None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-2569,420$95,963,431None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-2595,963,431$69,420,000None
Advisors Asset Management, Inc.2024-09-302026-08-229,126$8,436,987None
Advisors Asset Management, Inc.2024-06-302026-08-227,952$6,533,999None
Advisors Asset Management, Inc.2024-12-312026-08-228,968$5,306,366None
Advisors Asset Management, Inc.2025-12-312026-08-223,110$2,818,780None
Advisors Asset Management, Inc.2020-03-312026-08-2211,671$1,954,426None
Assenagon Asset Management S.A.2026-06-302026-08-221,485$2,052,805None
Harvest Fund Management Co., Ltd2026-06-302026-08-2128,056$38,737,000None
Kingsview Wealth Management, LLC2026-06-302026-08-201,075$1,486,054None
Sustainable Insight Capital Management, LLC2026-06-302026-08-20152$210,119None
MERCER GLOBAL ADVISORS INC /ADV2026-06-302026-08-209,772$13,508,616None
Beacon Pointe Advisors, LLC2026-06-302026-08-191,061$1,466,931None

90-day public filing window, up to 50 source positions.

Cornerstone Financial Management LLC ↗Cornerstone Financial Management LLC ↗Cornerstone Financial Management LLC ↗B. Riley Wealth Advisors, Inc. ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Corient Private Wealth LP ↗

Recent Congressional disclosures

No matching Congressional transactions were returned in this source preview.

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No records are available for this view.

Bounded public source preview, up to 25 disclosed events.

How to read the disclosure dates

The tables report different things: insider transactions, institutional positions and Congressional transaction ranges. Read each table with its source dates and units. They cannot be added into a combined ownership percentage.

  1. Company insiders

    SEC Form 4 purchases, sales and awards report transactions and their public filing availability.

  2. Institutional managers

    13F reports disclose delayed quarter-end positions. They are not a record of trades between quarters.

  3. Congressional filers

    Periodic transaction reports disclose transaction dates and amount brackets. Public filing dates determine what researchers could know.

Institutional source directory ↗Congressional source directory ↗

Read the transaction codes

Awards use transaction code A, purchases P and sales S. An acquisition from an award is not the same as an open-market purchase. Joint filers may share a transaction. Use original receipts and availability dates to interpret the events.

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