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MONOLITHIC POWER SYSTEMS INC — Director's Dealing 2025
Aug 18, 2025
30057_dirs_2025-08-18_e1fe85b1-d93f-4891-8e2a-eff0e0147f27.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: 2025-08-15
Reporting Person: Hsing Michael (N/A)
Non-Derivative Transactions
| Date | Security | Code | Shares | Price | A/D | Holdings After | Ownership |
|---|---|---|---|---|---|---|---|
| 2025-08-15 | Common Stock | S | 2603 | $825.69 | Disposed | 832295 | Direct |
| 2025-08-15 | Common Stock | S | 2555 | $826.64 | Disposed | 829740 | Direct |
| 2025-08-15 | Common Stock | S | 3878 | $827.72 | Disposed | 825862 | Direct |
| 2025-08-15 | Common Stock | S | 396 | $828.64 | Disposed | 825466 | Direct |
| 2025-08-15 | Common Stock | S | 4101 | $829.45 | Disposed | 821365 | Direct |
| 2025-08-15 | Common Stock | S | 2100 | $830.46 | Disposed | 819265 | Direct |
| 2025-08-15 | Common Stock | S | 1953 | $831.57 | Disposed | 817312 | Direct |
| 2025-08-15 | Common Stock | S | 1510 | $832.57 | Disposed | 815802 | Direct |
| 2025-08-15 | Common Stock | S | 535 | $833.37 | Disposed | 815267 | Direct |
| 2025-08-15 | Common Stock | S | 200 | $834.92 | Disposed | 815067 | Direct |
| 2025-08-15 | Common Stock | S | 400 | $836.40 | Disposed | 814667 | Direct |
Holdings (Non-Derivative)
| Security | Shares | Ownership |
|---|---|---|
| Common Stock | 133040 | Indirect |
| Common Stock | 12825 | 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 $825.06 to $825.86. 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 $826.12 to $826.98. 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.
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 $827.06 to $827.98. 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 $828.07 to $828.84. 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 $829.23 to $829.86. 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 $830.01 to $830.97. 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.
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 $831.00 to $831.87. 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 $832.05 to $832.90. 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.
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 $833.20 to $833.50. 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 $836.11 to $836.50. 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.