Monolithic Power (MPWR) EVP/CFO Executes 10b5-1 Sales Reducing Holdings
Rhea-AI Filing Summary
Monolithic Power Systems (MPWR) Form 4 reports multiple open-market sales by EVP and CFO Theodore Blegen executed on 10/01/2025 under a Rule 10b5-1 trading plan adopted 02/26/2025. The schedule shows a sequence of sales at weighted-average prices ranging from $902.61 to $917.17 per share across separate blocks, reducing Mr. Blegen's direct holdings from earlier reported balances down to 37,940 shares held directly. The filing also discloses indirect ownership of 5,331 shares in an irrevocable trust for Theodore F. Blegen and 5,331 shares in an irrevocable trust for Sarah N. Blegen. The form is signed by an attorney-in-fact.
Positive
- Transactions were executed under a Rule 10b5-1 trading plan, indicating pre-established, compliant disposition methodology
- Detailed weighted-average prices and offer to provide per-price breakdowns improve transparency for regulators and investors
- Indirect trust holdings remain disclosed, preserving visibility into continued insider economic exposure
Negative
- Significant reduction in direct holdings to 37,940 shares following multiple sales on 10/01/2025
- All reported activity are dispositions; no purchases or option grants reported that would offset dilution or indicate accumulation
Insights
TL;DR: Senior officer sold a material tranche of shares via a pre-established 10b5-1 plan; holdings decreased but indirect trust ownership remains.
The reported trades consist solely of planned dispositions under a Rule 10b5-1 plan adopted on 02/26/2025, with multiple execution lines on 10/01/2025 at weighted-average prices between $902.61 and $917.17. The direct position following the transactions is reported as 37,940 shares, with two identical irrevocable trust holdings of 5,331 shares each disclosed as indirect. For investors, this is a disclosure of insider liquidity rather than an operational signal; absence of purchases or option exercises in this filing suggests no concurrent increasing insider accumulation.
TL;DR: Sales were executed under a documented 10b5-1 plan, which supports compliance but reduces insider free float.
The filing transparently cites the 10b5-1 plan as the basis for the transactions and provides weighted-average price ranges and an undertaking to supply per-price breakdowns on request, which aligns with good governance disclosure practices. The signature by an attorney-in-fact is noted. These sales lower the reporting person’s direct ownership and should be viewed as scheduled liquidity rather than discretionary trades based on nonpublic information, per the plan disclosure.
Insider Trade Summary
| Type | Security | Shares | Price | Value |
|---|---|---|---|---|
| Sale | Common Stock | 6 | $902.61 | $5K |
| Sale | Common Stock | 40 | $903.82 | $36K |
| Sale | Common Stock | 60 | $904.00 | $54K |
| Sale | Common Stock | 115 | $905.37 | $104K |
| Sale | Common Stock | 250 | $907.36 | $227K |
| Sale | Common Stock | 80 | $909.52 | $73K |
| Sale | Common Stock | 65 | $911.27 | $59K |
| Sale | Common Stock | 676 | $912.73 | $617K |
| Sale | Common Stock | 138 | $913.87 | $126K |
| Sale | Common Stock | 390 | $914.71 | $357K |
| Sale | Common Stock | 440 | $915.43 | $403K |
| Sale | Common Stock | 580 | $916.37 | $531K |
| Sale | Common Stock | 160 | $917.17 | $147K |
| holding | Common Stock | -- | -- | -- |
| holding | Common Stock | -- | -- | -- |
Footnotes (1)
- These transactions were made pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on 2/26/2025. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. Ending balance includes 1 share acquired on August 15, 2025 through the Company's qualified ESPP program.
