Monolithic Power Systems (MPWR)EVP & General Counsel sold ~$14.3M

~$14.3M

Approx. value · 14K sh @ $1,016.18

130K

Holds after · shares reported

Traded

Oct 15, 2025

Filed

Oct 17, 2025

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. Aug 15, 2025Insider · 1 personInsiders: 11 sales (~$16.8M)
2. Aug 27, 2025InsiderDirector sold ~$168K of MPWR shares in the open market
3. Aug 29, 2025Insider · 1 personInsiders: 6 sales (~$3.4M)
4. Sep 2, 2025Insider · 1 personInsiders: 14 sales (~$2.4M)
5. Sep 18, 2025Insider · 2 peopleInsiders: 2 sales (~$14.5M)
6. Oct 15, 2025 · this disclosureInsiderOfficer sold ~$14.3M of MPWR shares in the open market

What came next

1. Oct 16, 2025Insider · 1 personInsiders: 2 sales (~$2.9M)
2. Oct 24, 2025InsiderOfficer sold ~$1.41M of MPWR shares in the open market
3. Oct 30, 2025Company filing · Form 8-K · ResultsReported its results
4. Nov 3, 2025Insider · 1 personInsiders: 22 sales (~$3.1M)
5. Nov 5, 2025InsiderOfficer sold ~$197K of MPWR shares in the open market
6. Nov 12, 2025Insider · 1 personInsiders: 19 sales (~$35.7M)
7. Nov 19, 2025Company filing · Form 8-K · Bylaws or charterChanged its bylaws, charter or fiscal year
8. Jan 8, 20265% stakeBlackRock, Inc. reported a passive stake (13G) of 10.2%
9. Jan 14, 2026Government · Federal Register noticeNotice of Receipt of Complaint; Solicitation of Comments Relating to the Public Interest
10. Feb 3, 2026Company filing · Form 8-K · Results, Executive changeChanged a top executive or board member, and reported its results (and 1 more item)“On February 3, 2026, Bernie Blegen informed the Company’s Board of Directors (the “Board”) of his intention to retire from his position as Executive Vice President and Chief Financial Officer.”
11. Feb 5, 20265% stakeFMR LLC reported a passive stake (13G) of 8.3%

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.