Monolithic Power Systems (MPWR)EVP & General Counsel sold ~$457K

~$457K

Approx. value · 360 sh @ $1,270.29

165K

Holds after · shares reported

Traded

Apr 8, 2026

Filed

Apr 10, 2026

The story around this disclosure

Every dated public record OQRO holds about the company from 60 days before to 120 days after, oldest first. It shows what was going on; none of it is a stated reason for the trade.

1. Feb 4, 2026CongressDisclosed purchase of MPWR — reported range $15,001 - $50,000
2. Feb 6, 2026Insider · 5 peopleInsiders: 5 sales (~$170.1M)
3. Feb 9, 2026InsiderDirector sold ~$485K of MPWR shares in the open market
4. Feb 10, 2026Insider · 1 personInsiders: 9 sales (~$38.8M)
5. Feb 11, 2026Insider · 2 peopleInsiders: 11 sales (~$39.5M)
6. Feb 12, 2026Insider · 1 personInsiders: 12 sales (~$38.7M)
7. Feb 17, 2026Government · Federal Register noticeCertain Power Converters, Circuit Board Assemblies, and Computing Systems Containing the Same; Notice of Institution of Investigation
8. Feb 26, 2026Company filing · Form 8-K · RestatementSaid past financial statements can no longer be relied on
9. Mar 20, 2026InsiderOfficer sold ~$33K of MPWR shares in the open market
10. Mar 27, 20265% stakeThe Vanguard Group reported a passive stake (13G)
11. Mar 30, 2026Insider · 1 personInsiders: 8 sales (~$25.9M)
12. Apr 1, 2026Insider · 2 peopleInsiders: 6 sales (~$1.6M)
13. Apr 6, 2026Insider · 1 personInsiders: 8 sales (~$8.9M)
14. Apr 8, 2026 · this disclosureInsiderOfficer sold ~$457K of MPWR shares in the open market

What came next

1. Apr 8, 2026Insider · 1 personInsiders: 9 sales (~$11.2M)
2. Apr 29, 20265% stakeVanguard Portfolio Management reported a passive stake (13G) of 5.1%
3. Apr 30, 2026Company filing · Form 8-K · ResultsReported its results
4. Apr 30, 20265% stakeVanguard Capital Management reported a passive stake (13G) of 7.3%
5. May 4, 2026InsiderOfficer sold ~$48K of MPWR shares in the open market
6. May 5, 2026Insider · 2 peopleInsiders: 3 sales (~$2.2M)
7. May 6, 2026Insider · 2 peopleInsiders: 4 sales (~$4.3M)
8. Jul 8, 20265% stakeFMR LLC reported a passive stake (13G) of 10.5%
9. Jul 15, 20265% stakeInvesco Ltd. reported a passive stake (13G) of 5.2%
10. Jul 30, 2026Company filing · Form 8-K · ResultsReported its results

How to read SEC Form 4

Form 4 is the filing that officers, directors and owners of more than 10% of a US-listed company must send to the SEC within two business days after they buy, sell or otherwise change their holding of the company's stock.

Full guide: What is an SEC Form 4?

What else is on file for Monolithic Power Systems

For Monolithic Power Systems, OQRO holds 33 insider filings (SEC Form 4 or Form 144), 2 Congress trade reports and 23 fund holdings reports (13F) dated in the last 90 days.

These are records OQRO holds, counted by their date, not a measure of how much trading took place. Routine paperwork such as option exercises and tax withholding is left out. Everything for the company is on its MPWR page.

Other recent filings by Saria Tseng, EVP & General Counsel

• SEC Form 4 at Monolithic Power Systems (MPWR)May 29, 2026
• SEC Form 4 at Monolithic Power Systems (MPWR)May 27, 2026
• SEC Form 4 at Monolithic Power Systems (MPWR)Apr 10, 2026
• SEC Form 4 at Monolithic Power Systems (MPWR)Apr 10, 2026
• SEC Form 4 at Monolithic Power Systems (MPWR)Apr 10, 2026

The full history of Saria Tseng, EVP & General Counsel is on the profile page.

How this filing works

• SEC Form 4
• Open-market purchase
• Rule 10b5-1 trading plans

Other disclosures at Monolithic Power Systems

• SEC Form 4Sep 30, 2026
• SEC Form 4Sep 30, 2026
• SEC Form 4Sep 30, 2026
• SEC Form 4Sep 30, 2026
• SEC Form 4Sep 30, 2026
• SEC Form 4Sep 30, 2026

Everything OQRO holds on this company is on its MPWR page.