Explore more topics
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 2026-11-07T14:03:26.246Z

Jump to a section

Read one actual disclosure before using it

Show the table · 1 row, 6 columns

Scroll sideways to compare all columns. Select a heading to sort.

2026-09-302026-09-28Hsing MichaelS130Not reported

First displayed source row from Recent Form 4 activity. The full bounded history and coverage notes remain below.

The displayed observation date is 2026-09-28 and its public availability date is 2026-09-30. Subtracting those calendar dates gives 2 days of disclosure lag. Historical public research can use the record from the availability date, rather than backdating knowledge to the observation date. The calendar-day difference does not assert an intraday publication time.

This row is code S: a sale. A purchase-following rule excludes this sale even if the reported dollar amount is large.

Open the linked original receipts to verify the row, then inspect a second record before drawing a pattern. This public filing observation supplies source evidence, not a completed copy-trading return.

SEC 0001214659-26-012375 ↗SEC 0001214659-26-012375 ↗SEC 0001214659-26-012375 ↗

Recent Form 4 activity

Inspect all 12 displayed rows: Recent Form 4 activity

Scroll sideways to compare all columns. Select a heading to sort.

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

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

Recent institutional filing receipts

Inspect all 50 displayed rows: 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.

Scroll sideways to compare all columns. Select a heading to sort.

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.

Show the table · 0 rows, 5 columns

Scroll sideways to compare all columns. Select a heading to sort.

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.