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MONOLITHIC POWER SYSTEMS INC — Director's Dealing 2025
Oct 2, 2025
30057_dirs_2025-10-01_4c0acb7c-0498-4f45-ae20-91a52deea4d7.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: 2025-10-01
Reporting Person: BLEGEN THEODORE (N/A)
Non-Derivative Transactions
| Date | Security | Code | Shares | Price | A/D | Holdings After | Ownership |
|---|---|---|---|---|---|---|---|
| 2025-10-01 | Common Stock | S | 6 | $902.61 | Disposed | 40933 | Direct |
| 2025-10-01 | Common Stock | S | 40 | $903.82 | Disposed | 40893 | Direct |
| 2025-10-01 | Common Stock | S | 60 | $904.00 | Disposed | 40833 | Direct |
| 2025-10-01 | Common Stock | S | 115 | $905.37 | Disposed | 40718 | Direct |
| 2025-10-01 | Common Stock | S | 250 | $907.36 | Disposed | 40468 | Direct |
| 2025-10-01 | Common Stock | S | 80 | $909.52 | Disposed | 40388 | Direct |
| 2025-10-01 | Common Stock | S | 65 | $911.27 | Disposed | 40323 | Direct |
| 2025-10-01 | Common Stock | S | 676 | $912.73 | Disposed | 39647 | Direct |
| 2025-10-01 | Common Stock | S | 138 | $913.87 | Disposed | 39509 | Direct |
| 2025-10-01 | Common Stock | S | 390 | $914.71 | Disposed | 39119 | Direct |
| 2025-10-01 | Common Stock | S | 440 | $915.43 | Disposed | 38679 | Direct |
| 2025-10-01 | Common Stock | S | 580 | $916.37 | Disposed | 38099 | Direct |
| 2025-10-01 | Common Stock | S | 160 | $917.17 | Disposed | 37940 | Direct |
Holdings (Non-Derivative)
| Security | Shares | Ownership |
|---|---|---|
| Common Stock | 5331 | Indirect |
| Common Stock | 5331 | Indirect |
Footnotes
F1: These transactions were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 2/26/2025.
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 $905.35 to $905.40. 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 $907.30 to $907.37. 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 $909.22 to $909.82. 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 $911.04 to $911.66. 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 $912.39 to $912.82. 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 $913.84 to $913.87. 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 $914.59 to $914.77. 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 $915.01 to $915.68. 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 $916.09 to $916.49. 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.
F11: 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 $917.08 to $917.28. 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.
F12: Ending balance includes 1 share acquired on August 15, 2025 through the Company's qualified ESPP program.