BLEGEN THEODORE 4

What Happened Theodore Blegen, Executive Vice President and Chief Financial Officer of Monolithic Power Systems, sold a total of 3,000 shares in multiple open‑market transactions on February 2, 2026. The trades were executed at prices ranging roughly from $1,110.58 to $1,139.49 per share, generating aggregate gross proceeds of approximately $3,389,267. These sales were made pursuant to a pre‑planned Rule 10b5‑1 trading plan adopted by Mr. Blegen on February 26, 2025, and therefore represent planned dispositions rather than ad hoc purchases.

Key Details

• Transaction date: February 2, 2026 (report filed Feb 4, 2026).
• Number of shares sold: 3,000 (across 17 reported lots).
• Price range: approximately $1,110.58 to $1,139.49 per share (footnotes provide weighted‑average ranges for specific lines).
• Total proceeds: about $3,389,267.
• Footnotes: F1 confirms trades were made under a Rule 10b5‑1 plan (adopted 2/26/2025). F2–F14 explain weighted‑average price ranges for the grouped lines; F15 notes an ending balance adjustment for a one‑share rounding difference.
• Shares owned after the transactions: not provided in the excerpt of this filing.
• Filing timeliness: no late filing indicated (period of report 2/2/2026; Form 4 filed 2/4/2026).

Context Sales executed under a Rule 10b5‑1 plan are pre‑arranged and typically scheduled in advance, which can make them routine and not necessarily indicative of the insider’s current view of the company. For retail investors, purchases by insiders often carry more informational weight than planned sales; this report documents a planned sale by the CFO.