| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| BLEGEN THEODORE | EVP and CFO | 5808 LAKE WASHINGTON BLVD NE, KIRKLAND | /s/ Saria Tseng, attorney-in-fact for Mr. Bernie Blegen | 2025-10-01 | 0001415033 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | MPWR | Common Stock | Sale | -$5.42K | -6 | -0.01% | $902.61 | 40.9K | Oct 1, 2025 | Direct | F1 |
| transaction | MPWR | Common Stock | Sale | -$36.2K | -40 | -0.1% | $903.82 | 40.9K | Oct 1, 2025 | Direct | F1 |
| transaction | MPWR | Common Stock | Sale | -$54.2K | -60 | -0.15% | $904.00 | 40.8K | Oct 1, 2025 | Direct | F1 |
| transaction | MPWR | Common Stock | Sale | -$104K | -115 | -0.28% | $905.37 | 40.7K | Oct 1, 2025 | Direct | F1, F2 |
| transaction | MPWR | Common Stock | Sale | -$227K | -250 | -0.61% | $907.36 | 40.5K | Oct 1, 2025 | Direct | F1, F3 |
| transaction | MPWR | Common Stock | Sale | -$72.8K | -80 | -0.2% | $909.52 | 40.4K | Oct 1, 2025 | Direct | F1, F4 |
| transaction | MPWR | Common Stock | Sale | -$59.2K | -65 | -0.16% | $911.27 | 40.3K | Oct 1, 2025 | Direct | F1, F5 |
| transaction | MPWR | Common Stock | Sale | -$617K | -676 | -1.68% | $912.73 | 39.6K | Oct 1, 2025 | Direct | F1, F6 |
| transaction | MPWR | Common Stock | Sale | -$126K | -138 | -0.35% | $913.87 | 39.5K | Oct 1, 2025 | Direct | F1, F7 |
| transaction | MPWR | Common Stock | Sale | -$357K | -390 | -0.99% | $914.71 | 39.1K | Oct 1, 2025 | Direct | F1, F8 |
| transaction | MPWR | Common Stock | Sale | -$403K | -440 | -1.12% | $915.43 | 38.7K | Oct 1, 2025 | Direct | F1, F9 |
| transaction | MPWR | Common Stock | Sale | -$531K | -580 | -1.5% | $916.37 | 38.1K | Oct 1, 2025 | Direct | F1, F10 |
| transaction | MPWR | Common Stock | Sale | -$147K | -160 | -0.42% | $917.17 | 37.9K | Oct 1, 2025 | Direct | F1, F11, F12 |
| holding | MPWR | Common Stock | 5.33K | Oct 1, 2025 | Irrevocable Trust FBO Theodore F. Blegen | ||||||
| holding | MPWR | Common Stock | 5.33K | Oct 1, 2025 | Irrevocable Trust FBO Sarah N. Blegen |
Buy Plan / Sale Plan: These are also open market purchases/sales of shares, but in this case the transaction is part of a trading plan. Rule 10b5-1 allows insiders to setup a trading plan to buy/sell stocks over a certain period of time. Since the purchases/sales are predetermined, this protects the insiders from violating insider trading law.
Transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).
| Id | Content |
|---|---|
| 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. |