Reported relationships
Latest disclosed role at each company.
| Company | Last reported as | Report date | Published |
|---|---|---|---|
| MONOLITHIC POWER SYSTEMS, INC.MPWR · Entity 877 | EVP and CFO | February 06, 2026 | February 10, 2026 |
Disclosed balances
About these balances
Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.
MONOLITHIC POWER SYSTEMS, INC.
Report date February 06, 2026 · Filed February 10, 2026
| Security / award | Ownership account | Disclosed shares / units | Disclosure context |
|---|---|---|---|
| Common StockSEC Table I · non-derivative | Direct | 82,353 |
Reported balance
After 2026-02-06 transaction · row 1
1 source rowRow 1 · 2026-02-06 · Sale · Disposed 21,725 · Balance 82,353 F1: The reported sales were to cover taxes upon the release of restricted stock units, as required by the Company's equity incentive plan. |
| Common StockSEC Table I · non-derivative | IndirectIrrevocable Trust FBO Sarah N. Blegen | 5,331 |
Reported balance
Holding disclosure · report date 2026-02-06 · row 2
Holding and transaction disclosures are not merged.
1 source rowRow 2 · Balance 5,331 |
| Common StockSEC Table I · non-derivative | IndirectIrrevocable Trust FBO Theodore F. Blegen | 5,331 |
Reported balance
Holding disclosure · report date 2026-02-06 · row 3
Holding and transaction disclosures are not merged.
1 source rowRow 3 · Balance 5,331 |
Filing footnotes · ownership attribution and instrument terms
F1: The reported sales were to cover taxes upon the release of restricted stock units, as required by the Company's equity incentive plan.
Transaction history
JSON APIPurchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”
The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.
| Transaction date | Company | Activity / security | Shares / units | Reported price | Reported value | Details |
|---|---|---|---|---|---|---|
| October 30, 2017 Filed Oct 31, 2017 20:49 UTC | MONOLITHIC POWER SYSTEMS, INC. MPWR · Entity 877 | SaleCommon Stock | 285 | $120.68 | $34,393.80 |
DisclosureSEC source: 0001280452-17-000116 · edgardoc.xml · nonDerivative · entry 1 Blegen Theodore · CIK 0001415033 · CFO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 41,160 F1 · kind: In accordance with the reporting person's 10b5-1 trading plan. Read SEC document |
| September 01, 2017 Filed Sep 6, 2017 22:15 UTC | MONOLITHIC POWER SYSTEMS, INC. MPWR · Entity 877 | SaleCommon Stock | 459 | $101.42 | $46,551.78 |
DisclosureSEC source: 0001280452-17-000103 · edgardoc.xml · nonDerivative · entry 1 Blegen Theodore · CIK 0001415033 · CFO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 41,445 F1 · kind: In accordance with the reporting person's 10b5-1 trading plan. Read SEC document |
| August 18, 2017 Filed Aug 21, 2017 21:26 UTC | MONOLITHIC POWER SYSTEMS, INC. MPWR · Entity 877 | SaleCommon Stock | 78 | $97.59 | $7,612.02 |
DisclosureSEC source: 0001280452-17-000100 · edgardoc.xml · nonDerivative · entry 4 Blegen Theodore · CIK 0001415033 · CFO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 41,904 F3 · kind: In accordance with the reporting person's 10b5-1 trading plan. Read SEC document |
| August 18, 2017 Filed Aug 21, 2017 21:26 UTC | MONOLITHIC POWER SYSTEMS, INC. MPWR · Entity 877 | SaleCommon Stock | 11 | $97.59 | $1,073.49 |
DisclosureSEC source: 0001280452-17-000100 · edgardoc.xml · nonDerivative · entry 3 Blegen Theodore · CIK 0001415033 · CFO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 41,982 F2 · kind: The reported sales were to cover taxes upon the vesting of restricted stock units, as required by the Company's equity incentive plans. Read SEC document |
| August 17, 2017 Filed Aug 21, 2017 21:26 UTC | MONOLITHIC POWER SYSTEMS, INC. MPWR · Entity 877 | SaleCommon Stock | 99 | $100.85 | $9,984.15 |
DisclosureSEC source: 0001280452-17-000100 · edgardoc.xml · nonDerivative · entry 2 Blegen Theodore · CIK 0001415033 · CFO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 41,993 F2 · kind: The reported sales were to cover taxes upon the vesting of restricted stock units, as required by the Company's equity incentive plans. Read SEC document |
| August 15, 2017 Filed Aug 21, 2017 21:26 UTC | MONOLITHIC POWER SYSTEMS, INC. MPWR · Entity 877 | OtherCommon Stock | 24 | $73.12 | $1,754.81 |
DisclosureSEC source: 0001280452-17-000100 · edgardoc.xml · nonDerivative · entry 1 Blegen Theodore · CIK 0001415033 · CFO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 42,092 F1 · kind: Acquired through the Company's qualified ESPP program. Read SEC document |
| July 31, 2017 Filed Aug 2, 2017 22:12 UTC | MONOLITHIC POWER SYSTEMS, INC. MPWR · Entity 877 | SaleCommon Stock | 285 | $102.60 | $29,241.00 |
DisclosureSEC source: 0001280452-17-000090 · edgardoc.xml · nonDerivative · entry 2 Blegen Theodore · CIK 0001415033 · CFO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 42,068 F2 · kind: In accordance with the reporting person's 10b5-1 trading plan. Read SEC document |
| July 31, 2017 Filed Aug 2, 2017 22:12 UTC | MONOLITHIC POWER SYSTEMS, INC. MPWR · Entity 877 | SaleCommon Stock | 177 | $102.60 | $18,160.20 |
DisclosureSEC source: 0001280452-17-000090 · edgardoc.xml · nonDerivative · entry 1 Blegen Theodore · CIK 0001415033 · CFO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 42,353 F1 · kind: The reported sales were to cover taxes upon the vesting of restricted stock units, as required by the Company's equity incentive plans. Read SEC document |
| June 26, 2017 Filed Jun 27, 2017 21:47 UTC | MONOLITHIC POWER SYSTEMS, INC. MPWR · Entity 877 | SaleCommon Stock | 4,604 | $99.00 | $455,796.00 |
DisclosureSEC source: 0001437749-17-011865 · rdgdoc.xml · nonDerivative · entry 1 Blegen Theodore · CIK 0001415033 · CFO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 42,530 F1 · kind: In accordance with the reporting person's 10b5-1 trading plan. F2 · 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 $99.00 to $99.462534. 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. Read SEC document |
| May 18, 2017 Filed May 19, 2017 21:37 UTC | MONOLITHIC POWER SYSTEMS, INC. MPWR · Entity 877 | SaleCommon Stock | 11 | $92.61 | $1,018.71 |
DisclosureSEC source: 0001280452-17-000070 · edgardoc.xml · nonDerivative · entry 2 Blegen Theodore · CIK 0001415033 · CFO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 47,134 F1 · kind: The reported sales were to cover taxes upon the vesting of restricted stock units, as required by the Company's equity incentive plans. Read SEC document |
| May 17, 2017 Filed May 19, 2017 21:37 UTC | MONOLITHIC POWER SYSTEMS, INC. MPWR · Entity 877 | SaleCommon Stock | 99 | $96.75 | $9,578.25 |
DisclosureSEC source: 0001280452-17-000070 · edgardoc.xml · nonDerivative · entry 1 Blegen Theodore · CIK 0001415033 · CFO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 47,145 F1 · kind: The reported sales were to cover taxes upon the vesting of restricted stock units, as required by the Company's equity incentive plans. Read SEC document |
| May 01, 2017 Filed May 2, 2017 21:44 UTC | MONOLITHIC POWER SYSTEMS, INC. MPWR · Entity 877 | SaleCommon Stock | 177 | $91.50 | $16,195.50 |
DisclosureSEC source: 0001280452-17-000058 · edgardoc.xml · nonDerivative · entry 1 Blegen Theodore · CIK 0001415033 · CFO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 47,244 F1 · kind: The reported sales were to cover taxes upon the vesting of restricted stock units, as required by the Company's equity incentive plans. Read SEC document |
| March 01, 2017 Filed Mar 2, 2017 23:05 UTC | MONOLITHIC POWER SYSTEMS, INC. MPWR · Entity 877 | SaleCommon Stock | 284 | $88.75 | $25,205.00 |
DisclosureSEC source: 0001280452-17-000042 · edgardoc.xml · nonDerivative · entry 1 Blegen Theodore · CIK 0001415033 · CFO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 47,421 F1 · kind: The reported sales were to cover taxes upon the vesting of restricted stock units, as required by the Company's equity incentive plans. Read SEC document |
| February 21, 2017 Filed Feb 22, 2017 22:24 UTC | MONOLITHIC POWER SYSTEMS, INC. MPWR · Entity 877 | SaleCommon Stock | 11 | $86.52 | $951.72 |
DisclosureSEC source: 0001280452-17-000036 · edgardoc.xml · nonDerivative · entry 3 Blegen Theodore · CIK 0001415033 · CFO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 47,705 F2 · kind: The reported sales were to cover taxes upon the vesting of restricted stock units, as required by the Company's equity incentive plans. Read SEC document |
| February 17, 2017 Filed Feb 22, 2017 22:24 UTC | MONOLITHIC POWER SYSTEMS, INC. MPWR · Entity 877 | SaleCommon Stock | 503 | $86.16 | $43,339.69 |
DisclosureSEC source: 0001280452-17-000036 · edgardoc.xml · nonDerivative · entry 2 Blegen Theodore · CIK 0001415033 · CFO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 47,716 F2 · kind: The reported sales were to cover taxes upon the vesting of restricted stock units, as required by the Company's equity incentive plans. Read SEC document |
| February 15, 2017 Filed Feb 22, 2017 22:24 UTC | MONOLITHIC POWER SYSTEMS, INC. MPWR · Entity 877 | OtherCommon Stock | 307 | $63.43 | $19,472.09 |
DisclosureSEC source: 0001280452-17-000036 · edgardoc.xml · nonDerivative · entry 1 Blegen Theodore · CIK 0001415033 · CFO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 48,219 F1 · kind: Acquired through the Company's qualified ESPP program. Read SEC document |
| February 07, 2017 Filed Feb 13, 2018 22:04 UTC | MONOLITHIC POWER SYSTEMS, INC. MPWR · Entity 877 | GrantCommon Stock | 2,460 | $0.00 | $0.00 |
DisclosureSEC source: 0001280452-18-000043 · edgardoc.xml · nonDerivative · entry 1 Blegen Theodore · CIK 0001415033 · CFO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 50,372 F1 · shares: On February 3, 2015, the reporting person was granted a target of 1,337 shares of restricted stock units, with the right to earn up to 200% of the target shares, subject to satisfaction of pre-determined, performance-based vesting criteria. On February 7, 2017, the Company's Board of Directors determined that those performance criteria for the restricted stock units had been satisfied, which resulted in 1,123 additional shares being achieved and earned by the reporting person. Of the restricted stock units that were awarded, 1,230 will vest February 16, 2017 and 1,230 will vest quarterly in the next two years. Read SEC document |
| January 30, 2017 Filed Jan 31, 2017 22:54 UTC | MONOLITHIC POWER SYSTEMS, INC. MPWR · Entity 877 | SaleCommon Stock | 206 | $89.00 | $18,334.00 |
DisclosureSEC source: 0001280452-17-000008 · edgardoc.xml · nonDerivative · entry 1 Blegen Theodore · CIK 0001415033 · CFO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 47,912 F1 · kind: The reported sales were to cover taxes upon the vesting of restricted stock units, as required by the Company's equity incentive plans. Read SEC document |
| November 29, 2016 Filed Dec 1, 2016 23:10 UTC | MONOLITHIC POWER SYSTEMS, INC. MPWR · Entity 877 | SaleCommon Stock | 185 | $83.78 | $15,499.30 |
DisclosureSEC source: 0001280452-16-000343 · edgardoc.xml · nonDerivative · entry 1 Blegen Theodore · CIK 0001415033 · CFO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 48,118 F1 · kind: The reported sales were to cover taxes upon the vesting of restricted stock units, as required by the Company's equity incentive plans. Read SEC document |
| November 18, 2016 Filed Nov 22, 2016 02:17 UTC | MONOLITHIC POWER SYSTEMS, INC. MPWR · Entity 877 | SaleCommon Stock | 11 | $81.66 | $898.26 |
DisclosureSEC source: 0001437749-16-042487 · rdgdoc.xml · nonDerivative · entry 2 Blegen Theodore · CIK 0001415033 · CFO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 48,303 F1 · kind: The reported sales were to cover taxes upon the vesting of restricted stock units, as required by the Company's equity incentive plans. Read SEC document |
| November 17, 2016 Filed Nov 22, 2016 02:17 UTC | MONOLITHIC POWER SYSTEMS, INC. MPWR · Entity 877 | SaleCommon Stock | 40 | $81.27 | $3,250.80 |
DisclosureSEC source: 0001437749-16-042487 · rdgdoc.xml · nonDerivative · entry 1 Blegen Theodore · CIK 0001415033 · CFO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 48,314 F1 · kind: The reported sales were to cover taxes upon the vesting of restricted stock units, as required by the Company's equity incentive plans. Read SEC document |
| October 28, 2016 Filed Nov 1, 2016 22:01 UTC | MONOLITHIC POWER SYSTEMS, INC. MPWR · Entity 877 | SaleCommon Stock | 177 | $77.97 | $13,800.69 |
DisclosureSEC source: 0001280452-16-000326 · edgardoc.xml · nonDerivative · entry 1 Blegen Theodore · CIK 0001415033 · CFO 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 48,354 F1 · kind: The reported sales were to cover taxes upon the vesting of restricted stock units, as required by the Company's equity incentive plans. Read SEC document |
Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.