As of November 4, 2026, Monolithic Power Systems, Inc. is a publicly traded company (Nasdaq: MPWR); its largest reported holder is Fidelity (FMR), with 10.5% on Schedule 13G/A of July 8, 2026, then BlackRock (10.2%). The largest insider holding is Michael Hsing, the chief executive and a director, with 964,129 shares (2.0% of shares outstanding), per Form 4 of September 30, 2026 (Schedule 13G/A, July 8, 2026).
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Is Monolithic Power Systems, Inc. a real, registered company?
- Monolithic Power Systems Inc files with the SEC under CIK 1280452 (its SEC filings).
- Its shares are listed under the ticker MPWR on Nasdaq (SEC company record).
- Incorporated in Delaware; business address in West Palm Beach, Florida, as its SEC filings state.
- Court and bankruptcy records: see Before you sign or pay below.
Before you sign or pay
- Court and bankruptcy: No federal court case or bankruptcy filing found under MONOLITHIC POWER SYSTEMS INC in our court records and SEC 8-K records (as of 2026-11-04).
- Leadership changes: the latest reported is Tony Balow, Chief Financial Officer (Form 8-K filed 2026-10-29). Check you are dealing with the people now in charge.
- Ownership: 5%+ holders are reported on Schedule 13D or 13G; the latest names Invesco (filed 2026-07-15).
Who are Monolithic Power Systems, Inc.'s owners and officers?
Monolithic Power Systems, Inc.: incorporated in Delaware; business address in West Palm Beach, Florida; industry Semiconductors & Related Devices (Form D, 2026-10-29).
| Report | Holder | Share |
|---|---|---|
| Schedule 13G, 2026-07-15 | Invesco LTD. | 5.2% |
| Schedule 13G/A, 2026-07-08 | Fmr LLC | 10.5% |
| Schedule 13G, 2026-04-30 | Vanguard Capital Management | 7.25% |
| Schedule 13G, 2026-04-29 | Vanguard Portfolio Management | 5.14% |
| Schedule 13G/A, 2026-03-27 | The Vanguard Group | 0% |
| Schedule 13G/A, 2026-02-05 | Fmr LLC | 8.3% |
| Schedule 13G/A, 2026-01-08 | Blackrock, Inc. | 10.2% |
| Schedule 13G/A, 2025-07-29 | The Vanguard Group | 12.4% |
Questions about who owns Monolithic Power Systems, Inc.
Who owns Monolithic Power Systems, Inc.?
On this page, 5 holders' latest ownership filings report 5% or more of Monolithic Power Systems, Inc.: Fmr LLC (10.5%, Schedule 13G/A, filed 2026-07-08), Blackrock, Inc. (10.2%, Schedule 13G/A, filed 2026-01-08), Vanguard Capital Management (7.25%, Schedule 13G, filed 2026-04-30), Invesco LTD. (5.2%, Schedule 13G, filed 2026-07-15) and Vanguard Portfolio Management (5.14%, Schedule 13G, filed 2026-04-29).
Who are the largest shareholders of Monolithic Power Systems, Inc.?
By the share each holder's latest filing reports, the largest holders of Monolithic Power Systems, Inc. on this page are Fmr LLC (10.5%), Blackrock, Inc. (10.2%) and Vanguard Capital Management (7.25%).
When did Fmr LLC buy into Monolithic Power Systems, Inc.?
The filings give report dates, not purchase dates. The earliest filing from Fmr LLC on this page is the Schedule 13G/A, filed 2026-02-05, reporting 8.3%; its latest, Schedule 13G/A filed 2026-07-08, reports 10.5%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 8 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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What They Do, And How The Money Works
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| Filed | Person | Role | Change | Effective |
|---|---|---|---|---|
| Form 8-K, 2026-10-29 | Tony Balow | Chief Financial Officer | appointed | |
| Form 8-K, 2026-10-29 | Robert Dean | Chief Accounting Officer | appointed |
Which insiders own Monolithic Power Systems, Inc. shares?
Directors, officers and holders of 10% or more report their shares on Forms 3, 4 and 5. Each line is the latest such report, largest holding first.
- , the chief executive and a director: 964,129 shares (2.0% of shares outstanding), 818,264 held directly and 145,865 indirectly (Form 4, 2026-09-30).
- , the executive vice president and ww sales: 234,442 shares (0.48% of shares outstanding), 126,644 held directly and 107,798 indirectly (Form 4, 2026-08-06).
- , the executive vice president and global operations: 230,750 shares (0.47% of shares outstanding), 205,959 held directly and 24,791 indirectly (Form 4, 2026-05-08).
- , the general counsel and executive vice president: 145,218 shares (0.30% of shares outstanding), 142,218 held directly and 3,000 indirectly (Form 4, 2026-09-02).
- , the chief financial officer and executive vice president: 93,015 shares (0.19% of shares outstanding), 82,353 held directly and 10,662 indirectly (Form 4, 2026-02-10).
Shares outstanding: 48,768,000 as of 2026-10-27, from the company's latest SEC cover page.
How much has Monolithic Power Systems, Inc. raised?
No fundraising or offering filing from Monolithic Power Systems, Inc. is on file with us.
Keep reading
More on Monolithic Power Systems, Inc. and the records around it.
Monolithic Power Systems, Inc. elsewhere on the record
- Leadership changes Oct 2026
Companies that share a holder
- Invesco Ltd. also filed stake reports on 83 other companies: Alignment Healthcare Inc (Aug 2026), ArcBest Corp (Aug 2026), ARKO Petroleum Corp (Aug 2026)
- FMR LLC also filed stake reports on 713 other companies: BRP INC (Oct 2026), CELLDEX THERAPEUTICS INC (Oct 2026), EIKON THERAPEUTICS INC (Oct 2026)
- Vanguard Portfolio Management also filed stake reports on 941 other companies: A10 Networks Inc (Oct 2026), ADT Inc (Oct 2026), Appian Corp (Oct 2026)
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