Monolithic Power Systems (MPWR)Factory Mutual Insurance Co reduced its stake -4,515 shares

35K

Shares reported · -4,515 vs prior quarter

0.46%

Disclosed portfolio weight

$49M

Reported value

Holdings as of

Jun 30, 2026

Filed

Jul 21, 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. May 22, 2026InsiderOfficer sold ~$7.93M of MPWR shares in the open market
2. May 26, 2026Insider · 2 peopleInsiders: 2 sales (~$853K)
3. May 27, 2026InsiderOfficer sold ~$12.9M of MPWR shares in the open market
4. Jun 1, 2026InsiderOfficer sold ~$46K of MPWR shares in the open market
5. Jun 5, 2026Congress · 1 personMembers of Congress: 2 sales
6. Jul 1, 2026InsiderOfficer sold ~$41K of MPWR shares in the open market
7. Jul 8, 20265% stakeFMR LLC reported a passive stake (13G) of 10.5%
8. Jul 15, 20265% stakeInvesco Ltd. reported a passive stake (13G) of 5.2%
9. Jul 15, 2026Insider · 1 personInsiders: 18 sales (~$20.2M)

What came next

1. Jul 30, 2026Company filing · Form 8-K · ResultsReported its results
2. Aug 3, 2026InsiderOfficer sold ~$40K of MPWR shares in the open market
3. Aug 5, 2026InsiderCFO sold ~$141K of MPWR shares in the open market
4. Aug 11, 2026InsiderDirector sold ~$71K of MPWR shares in the open market
5. Aug 17, 2026InsiderCFO sold ~$8.5K of MPWR shares in the open market
6. Aug 24, 2026Insider · 2 peopleInsiders: 2 sales (~$106K)
7. Sep 14, 2026Government · Federal Register noticeNotice of Receipt of Complaint; Solicitation of Comments Relating to the Public Interest
8. Sep 28, 2026Insider · 1 personInsiders: 8 sales (~$40.3M)

How to read SEC Form 13F-HR

Form 13F is the quarterly report in which investment managers that oversee $100 million or more list the US-listed stocks and some other securities they held on the last day of the quarter.

Full guide: What is an SEC Form 13F?

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.

How this filing works

• SEC Form 13F

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.