Monolithic Power Systems, Inc. (MPWR) insider trading

{
  "status": "OK",
  "results": [
    {
      "tickers": [
        "MPWR",
        "MPWRE"
      ],
      "issuer_cik": "0001280452",
      "owner_cik": "0001308676",
      "accession_number": "0001214659-26-012375",
      "form_type": "4",
      "filing_date": "2026-09-30",
      "period_of_report": "2026-09-28",
      "issuer_name": "MONOLITHIC POWER SYSTEMS, INC.",
      "issuer_trading_symbol": "MPWR",
      "owner_name": "Hsing Michael",
      "is_director": true,
      "is_officer": true,
      "is_ten_percent_owner": false,
      "is_other": false,
      "officer_title": "CEO",
      "security_type": "non_derivative",
      "record_type": "transaction",
      "security_title": "Common Stock",
      "transaction_timeliness": "O",
      "aff_10b5_one": true,
      "transaction_date": "2026-09-28",
      "transaction_code": "S",
      "equity_swap_involved": false,
      "transaction_shares": 2121,
      "transaction_price_per_share": 1328.54,
      "transaction_acquired_disposed": "D",
      "shares_owned_following_transaction": 845547,
      "transaction_value": 2817833.34,
      "direct_or_indirect": "D",
      "footnotes": [
        {
          "id": "F1",
          "description": "These transactions were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 05/29/2026."
        },
        {
          "id": "F4",
          "description": "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 undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price."
        }
      ]
    },
    {
      "tickers": [
        "MPWR",
        "MPWRE"
      ],
      "issuer_cik": "0001280452",
      "owner_cik": "0001308676",
      "accession_number": "0001214659-26-012375",
      "form_type": "4",
      "filing_date": "2026-09-30",
      "period_of_report": "2026-09-28",
      "issuer_name": "MONOLITHIC POWER SYSTEMS, INC.",
      "issuer_trading_symbol": "MPWR",
      "owner_name": "Hsing Michael",
      "is_director": true,
      "is_officer": true,
      "is_ten_percent_owner": false,
      "is_other": false,
      "officer_title": "CEO",
      "security_type": "non_derivative",
      "record_type": "transaction",
      "security_title": "Common Stock",
      "transaction_timeliness": "O",
      "aff_10b5_one": true,
      "transaction_date": "2026-09-28",
      "transaction_code": "S",
      "equity_swap_involved": false,
      "transaction_shares": 1111,
      "transaction_price_per_share": 1333.34,
      "transaction_acquired_disposed": "D",
      "shares_owned_following_transaction": 844436,
      "transaction_value": 1481340.74,
      "direct_or_indirect": "D",
      "footnotes": [
        {
          "id": "F1",
          "description": "These transactions were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 05/29/2026."
        },
        {
          "id": "F5",
          "description": "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 undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer, or a security holder of the issuer, full information regarding the number of shares sold at each separate price."
        }
      ]
    }
  ]
}

// trimmed to 2 results

The response includes every Form 4 record; this page keeps open-market purchases and sales on common stock and removes duplicate joint-filer rows.