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MONOLITHIC POWER SYSTEMS INC — Director's Dealing 2025
Nov 20, 2025
30057_dirs_2025-11-20_3e91d61e-7a7c-4120-8191-65105da55e8b.zip
Director's Dealing
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SEC Form 4 — Statement of Changes in Beneficial Ownership
Issuer: MONOLITHIC POWER SYSTEMS INC (MPWR)
CIK: 0001280452
Period of Report: 2025-11-19
Reporting Person: Sciammas Maurice (N/A)
Non-Derivative Transactions
| Date | Security | Code | Shares | Price | A/D | Holdings After | Ownership |
|---|---|---|---|---|---|---|---|
| 2025-11-19 | Common Stock | S | 240.00 | $862.58 | Disposed | 183066 | Direct |
| 2025-11-19 | Common Stock | S | 160.00 | $863.86 | Disposed | 182906 | Direct |
| 2025-11-19 | Common Stock | S | 40.00 | $865.89 | Disposed | 182866 | Direct |
| 2025-11-19 | Common Stock | S | 339.00 | $866.19 | Disposed | 182527 | Direct |
| 2025-11-19 | Common Stock | S | 699.00 | $867.57 | Disposed | 181828 | Direct |
| 2025-11-19 | Common Stock | S | 723.00 | $868.42 | Disposed | 181105 | Direct |
| 2025-11-19 | Common Stock | S | 1842.00 | $869.39 | Disposed | 179263 | Direct |
| 2025-11-19 | Common Stock | S | 320.00 | $870.36 | Disposed | 178943 | Direct |
| 2025-11-19 | Common Stock | S | 220.00 | $871.45 | Disposed | 178723 | Direct |
| 2025-11-19 | Common Stock | S | 574.00 | $872.80 | Disposed | 178149 | Direct |
| 2025-11-19 | Common Stock | S | 1146.00 | $873.78 | Disposed | 177003 | Direct |
| 2025-11-19 | Common Stock | S | 731.00 | $874.50 | Disposed | 176272 | Direct |
Holdings (Non-Derivative)
| Security | Shares | Ownership |
|---|---|---|
| Common Stock | 1699 | Indirect |
| Common Stock | 2000 | Indirect |
| Common Stock | 1299 | Indirect |
| Common Stock | 49460 | Indirect |
| Common Stock | 26660 | Indirect |
| Common Stock | 1699 | Indirect |
| Common Stock | 4015 | Indirect |
| Common Stock | 5000 | Indirect |
| Common Stock | 1000 | Indirect |
| Common Stock | 1699 | Indirect |
| Common Stock | 1499 | Indirect |
Footnotes
F1: 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 $862.25 to $862.75. 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.
F2: 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 $866.16 to $866.51. 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.
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 $867.04 to $867.98. 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.
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 $868.00 to $868.94. 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.
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 $869.00 to $869.91. 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.
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 $870.07 to $870.98. 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.
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 $871.39 to $871.64. 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.
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 $872.74 to $872.89. 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.
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 $873.49 to $873.97. 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.
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 $874.09 to $874.90. 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.