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Monolithic Power Systems, Inc. planned insider sales

In the twelve months since 23 September 2025 insiders at Monolithic Power Systems, Inc. filed 69 Form 144 notices of planned sales, 1.1 million shares worth $1.30 billion at the time of filing, from 21 sellers. The latest, filed 24 August 2026: Dean Robert W Ii (officer), 32 shares worth $41,527, planned for around 24 August 2026 through Morgan Stanley Smith Barney LLC Executive Financial Services.

FiledSellerRelationshipSharesValuePlanned saleBrokerHow acquiredFiling
24 August 2026Dean Robert W IiOfficer32$41,52724 August 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesTime-based restricted stock unitsForm 144
17 August 2026Dean Robert W IiOfficer6$8,12817 August 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesTime-based restricted stock unitsForm 144
11 August 2026Kuo Wei ChangDirector100$142,00011 August 2026UBS Financial Services IncRSUForm 144
5 August 2026Robert DeanOfficer105$141,1485 August 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance SharesForm 144
15 July 2026Maurice SciammasOfficer15,000$20.2 million15 July 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
1 June 2026Theodore Bernhard BlegenOfficer3,001$4.6 million1 June 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance SharesForm 144
28 May 2026Saria TsengOfficer7,565$12.9 million27 May 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance SharesForm 144
26 May 2026Dean Robert W IiOfficer22$35,88226 May 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesTime-based restricted stock unitsForm 144
26 May 2026Jeff ZhouDirector486$816,48026 May 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
22 May 2026Saria TsengOfficer5,000$7.9 million22 May 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance SharesForm 144
18 May 2026Dean Robert W IiOfficer4$6,25318 May 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesTime-based restricted stock unitsForm 144
18 May 2026Michael HsingOfficer, Director40,000$59.3 million18 May 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance SharesForm 144
15 May 2026Maurice SciammasOfficer12,000$18.7 million15 May 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance SharesForm 144
6 May 2026Eileen WynneDirector335$530,1966 May 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
6 May 2026Jeff ZhouDirector500$825,0006 May 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
6 May 2026Elmiger Eugen JDirector12,000$19.8 million7 May 2026Luzerner Kantonalbank AGRestricted Stock UnitsForm 144
6 May 2026Deming XiaoOfficer30,000$49.6 million6 May 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance SharesForm 144
5 May 2026Rosalind SciammasMember of immediate family of any of the foregoing400$600,0005 May 2026UBS Financial Services IncGRAT DistributionForm 144
5 May 2026Jeff ZhouDirector1,014$1.6 million5 May 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted StockForm 144
1 May 2026Theodore Bernhard BlegenOfficer3,000$4.6 million1 May 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance SharesForm 144
8 April 2026Saria TsengOfficer8,964$11.7 million8 April 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance SharesForm 144
6 April 2026Saria TsengOfficer7,636$8.9 million6 April 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance SharesForm 144
1 April 2026Saria TsengOfficer1,400$1.6 million1 April 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance SharesForm 144
1 April 2026Theodore Bernhard BlegenOfficer3,000$3.3 million1 April 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance SharesForm 144
30 March 2026Saria TsengOfficer25,674$25.9 million30 March 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance SharesForm 144
20 March 2026Sciammas MauriceOfficer120$131,33320 March 2026UBS Financial Services, Inc.GiftForm 144
2 March 2026Theodore Bernhard BlegenOfficer3,000$3.3 million2 March 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance SharesForm 144
12 February 2026Michael HsingOfficer, Director33,000$38.7 million12 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance SharesForm 144
11 February 2026Michael HsingOfficer, Director33,000$39.2 million11 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance SharesForm 144
10 February 2026The Sciammas Trust DTD 06/08/2018Member of immediate family of any of the foregoing200$240,00010 February 2026UBS Financial Services IncGRAT DistributionForm 144
10 February 2026Michael HsingOfficer, Director34,000$38.8 million10 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance SharesForm 144
6 February 2026Blegen TheodoreOfficer995$1.2 million6 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance-based restricted stock unitsForm 144
6 February 2026Tseng SariaOfficer1,286$1.5 million6 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance-based restricted stock unitsForm 144
6 February 2026Xiao DemingOfficer1,286$1.5 million6 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance-based restricted stock unitsForm 144
6 February 2026Sciammas MauriceOfficer1,286$1.5 million6 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance-based restricted stock unitsForm 144
6 February 2026Hsing MichaelOfficer, Director3,082$3.6 million6 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance-based restricted stock unitsForm 144
4 February 2026Blegen TheodoreOfficer20,730$24.1 million4 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance-based restricted stock unitsForm 144
4 February 2026Sciammas MauriceOfficer21,590$25.1 million4 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance-based restricted stock unitsForm 144
4 February 2026Tseng SariaOfficer21,590$25.1 million4 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance-based restricted stock unitsForm 144
4 February 2026Xiao DemingOfficer21,590$25.1 million4 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance-based restricted stock unitsForm 144
4 February 2026Hsing MichaelOfficer, Director51,841$60.4 million4 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance-based restricted stock unitsForm 144
2 February 2026Theodore Bernhard BlegenOfficer3,000$3.4 million2 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance SharesForm 144
2 January 2026Theodore Bernhard BlegenOfficer3,000$2.8 million2 January 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance SharesForm 144
29 December 2025Victor LeeDirector2,000$1.9 million24 December 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock UnitsForm 144
1 December 2025Bernie BlegenOfficer3,000$2.7 million1 December 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance SharesForm 144
26 November 2025Saria TsengOfficer20,000$18.5 million26 November 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance SharesForm 144
25 November 2025Saria TsengOfficer20,000$18.1 million25 November 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance SharesForm 144
24 November 2025Maurice SciammasOfficer3,976$3.6 million24 November 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance SharesForm 144
21 November 2025Kuo Wei ChangDirector200$169,24021 November 2025UBS Financial Services IncRSUForm 144
19 November 2025Maurice SciammasOfficer35,000$30.8 million19 November 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance SharesForm 144
12 November 2025Hsing MichaelOfficer, Director7,000$6.7 million12 November 2025UBS Financial Services IncRestricted Stock UnitsForm 144
12 November 2025Michael HsingOfficer, Director30,000$29.0 million12 November 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance SharesForm 144
12 November 2025Michael HsingOfficer, Director40,000$38.3 million11 November 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance SharesForm 144
4 November 2025The Sciammas Trust DTD 06/08/2018Member of immediate family of any of the foregoing200$194,0005 November 2025UBS Financial Services IncGRAT DISTRIBUTIONForm 144
3 November 2025Bernie BlegenOfficer3,000$3.1 million3 November 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance SharesForm 144
30 October 2025Blegen TheodoreOfficer1,077$1.2 million30 October 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance-based restricted stock unitsForm 144
30 October 2025Tseng SariaOfficer1,216$1.3 million30 October 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance-based restricted stock unitsForm 144
30 October 2025Xiao DemingOfficer1,216$1.3 million30 October 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance-based restricted stock unitsForm 144
30 October 2025Sciammas MauriceOfficer1,216$1.3 million30 October 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance-based restricted stock unitsForm 144
30 October 2025Hsing MichaelOfficer, Director2,718$3.0 million30 October 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance-based restricted stock unitsForm 144
28 October 2025Blegen TheodoreOfficer47,222$52.2 million28 October 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance-based restricted stock unitsForm 144
28 October 2025Sciammas MauriceOfficer53,328$58.9 million28 October 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance-based restricted stock unitsForm 144
28 October 2025Tseng SariaOfficer53,328$58.9 million28 October 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance-based restricted stock unitsForm 144
28 October 2025Xiao DemingOfficer53,328$58.9 million28 October 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance-based restricted stock unitsForm 144
28 October 2025Hsing MichaelOfficer, Director302,920$334.7 million28 October 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance-based restricted stock unitsForm 144
24 October 2025Saria TsengOfficer1,301$1.4 million24 October 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance SharesForm 144
16 October 2025Saria TsengOfficer2,812$2.9 million16 October 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance SharesForm 144
15 October 2025Saria TsengOfficer14,028$14.3 million15 October 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance SharesForm 144
1 October 2025Bernie BlegenOfficer3,000$2.7 million1 October 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesPerformance SharesForm 144

A Form 144 is the notice an insider files with the SEC before selling restricted or control shares over the Rule 144 thresholds; it says what may be sold, not what was. Value is the filer's own aggregate market value. Whether the sale happened shows up later on Form 4, on the insiders page.

Source

Form 144 filings on EDGAR for Monolithic Power Systems, Inc.: the company's filing index, each notice read from its own XML.

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