Transaction · 0001214659-26-012375

Hsing Michael

Hsing Michael, CEO, reported an open-market or private sale at MONOLITHIC POWER SYSTEMS, INC. involving 2121.000000 shares for an estimated $2817833.34. Reported holdings after the transaction were 845547.000000 shares. The stored filing text includes a detected 10b5-1 reference.

Open-market sellSEC transaction code SCEO
MPWRMONOLITHIC POWER SYSTEMS, INC.
Filing timeSep 30
Trade dateSep 28, 2026
Filing · SECView on SEC
InsiderProfile
% of reported position traded0.25%Shares sold ÷ (holdings after + shares sold). Estimated position before: 847,668 shares.

Row-level estimate for this security and ownership context, not the insider’s complete portfolio. Joint ownership, other transactions in the filing, amendments and footnotes can affect interpretation.

Price performance since filing

Close on the filing date, the pre-filing context, and the forward return at standard windows
Price at filing
$1,347.22
Pre-filing
1mo ago -6.8%1w ago -5.2%1d ago +1.5%
Returns since
7d30d90d180d1y

MPWR price since this filing

30 days of pre-filing context and vertical markers at the filing date plus 7d / 30d / 90d / 180d / 1y afterwards
MPWR since 2026-09-30Filed yesterday · 1 day of post-filing data
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Filing datePost-filing windows (7d, 30d, 90d, 180d, 1y)30 days of pre-filing context

Transaction facts

Stored Form 4 columns with their raw values

Non-derivative
Type
Sell
Code S
Identifier
0001214659-26-012375
Common Stock
Transaction date
Sep 28, 2026
Filed Sep 30, 2026, 09:21 PM · 2d delay
Shares
2.12k sh
$1,328.54 per share
Estimated value
-$2.81M
Computed from shares × price
Holdings after
845k sh
Direct

Filing signal explanations

Badges describe filing facts only — not predictions.

Cluster 14dRepeat 30dPattern $100kLarge $1.00M
Direct Ownership Large Sale Repeat Seller 10b5-1 Detected
0score
Filing-only score

0

Compact filing score computed from stored Form 4 facts. Version v1.

Neutral filing signal

This filing is broadly neutral on the filing-only scale. The Form 4 facts do not strongly tilt positive or negative.

Reported relationships & other filings

Form 4 relationship flags and nearby filing context

Reported roles

CEO

Officer YesDirector Yes10% NoOther No
Footnotes & amended
  1. F1

    These transactions were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 05/29/2026.

  2. F2

    Ending balance includes 1 share acquired on August 17, 2026, through the Company's qualified ESPP program.

  3. F3

    The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,320.64 to $1,325.61. The reporting person…

  4. F4

    The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,325.65 to $1,330.62. The reporting person…

  5. F5

    The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,330.65 to $1,335.51. The reporting person…

  6. F6

    The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,335.68 to $1,340.66. The reporting person…

  7. F7

    The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,340.69 to $1,345.65. The reporting person…

  8. F8

    The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,345.66 to $1,350.47. The reporting person…

  9. F9

    The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,350.84 to $1,355.11. The reporting person…

  10. F10

    The price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $1,356.78 to $1,357.00. The reporting person…

Original filing · 0001214659-26-012375
Related transactions

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Same reporting owner
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