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MPWRMonolithic Power Systems · Insider ownership research

Monolithic Power Systems insiders sold $746M in the past 12 months. How much of their stake is that?

About 60% overall. As a group they ended with more shares than they started with. These figures leave out Michael Hsing, the largest holder (most holdings were last confirmed in 2015).

Updated Oct 9, 2026 from SEC filings · covers Oct 10, 2025 to Oct 9, 2026
How this comparesMore of their stake sold than at 415 of the 416 other companies we can measure (#2 of 417)See ranking
0
buyers among officers and directors, past 12 months
37%
of sales were under disclosed trading plans, past 12 months
11 of 12
officers and directors sold shares, past 12 months
Recent activity · past 30 days, Sep 10, 2026 to Oct 9, 2026
Sep 28, 2026Michael Hsing sold 30K shares ($40.3M) under a disclosed trading plan. That is 3.0% of the total stake held that day.
WhoSharesPrice% of total stakeTotal stake afterTrade dateFiled
Michael Hsing
CEO, Director
30,000$1344.973.0%964KSep 28, 2026Sep 30, 2026

"% of total stake" is the shares in this event against all the vested shares the person held that day, across every share class and holding entity, after that day's vesting. "n/a" means the person's holdings don't reconcile, or the row is a purchase. "Holdings record incomplete" means more shares were sold than the filings show the person held that day, so a percentage would be wrong.

Is this normal? More than usual: about 1.5x the 5-year average. 11 insiders sold; the average is 8 a year. Year by year
Latest filing: Filed Sep 30 for a sale on Sep 28. Michael Hsing sold 30K shares ($40.3M) under a disclosed plan. Filing
88 SEC ownership filings in the period · See the evidence

What stands out

Five insiders sold more than 25% of vested holdings: Saria Tseng (95% of holdings, $151M, 44% under a disclosed plan), Deming Xiao (36% of holdings, $76.4M, none under a disclosed plan) and Theodore Blegen (69% of holdings, $37.5M, 32% under a disclosed plan), plus 2 more.Saria Tseng: largest sale, Feb 6, 2026 · Deming Xiao: largest sale, Feb 6, 2026 · Theodore Blegen: largest sale, Feb 6, 2026
Two officers sold $169M with no disclosed plan: Michael Hsing ($133M) and Maurice Sciammas ($35.4M). The filings don't state a reason.Michael Hsing: largest such sale, May 18, 2026 · Maurice Sciammas: largest such sale, Nov 19, 2025
Robert Dean II sold 169 shares (2.5% of starting holdings), but 618 more shares were added, so the stake grew (from 6.7K to 7.2K).Largest sale, Aug 5, 2026

Percentages cover 9 of 12 officers and directors. Left out: Michael Hsing (most holdings were last confirmed in 2015); Maurice Sciammas (holdings couldn't be fully reconciled); Kuo Chang (most holdings were last confirmed in 2007). Disclosed company stock is not an insider's whole wealth.

Who sold, and how much of their stake

Officers and directors, past 12 months. Each bar is 100% of that person's own stake; not comparable between people. The stake is the vested shares held at the start of the period (Oct 9, 2025); the gold part is what they sold.

SoldRest of starting stake
Michael Hsing
CEO, Director
Sold $355M (plan status beside the amount). Share of stake not shown: most holdings were last confirmed in 2015. Why
$355M44% planned, 18% to cover taxes 38% no plan disclosed
Saria Tseng
EVP & General Counsel
95% · $151M44% planned, 18% to cover taxes 38% no plan disclosed
Maurice Sciammas
EVP, WW Sales & Marketing
Sold $101M (plan status beside the amount). Share of stake not shown: holdings couldn't be fully reconciled. Why
$101M39% planned, 26% to cover taxes 35% no plan disclosed
Deming Xiao
EVP, Global Operations
36% · $76.4M35% to cover taxes 65% no plan disclosed
Theodore Blegen
EVP and CFO
69% · $37.5M32% planned, 68% to cover taxes
All 11 sellers

Selling by month

Officers and directors, Oct 2025 to Oct 2026. Each sale is counted once: under a disclosed plan, else to cover taxes, else no plan disclosed.

Disclosed planTo cover taxesNo plan disclosedOne dollar scale for every month; the tallest bar is labeled
Oct 2025: $18.6M under a disclosed planOctNov 2025: $3.1M under a disclosed planNov 2025: $145M no plan disclosedNovDec 2025: $3.7M under a disclosed planDecJan 2026: $3.4M under a disclosed planJanFeb 2026: $121M under a disclosed planFeb 2026: $170M to cover taxesFeb 2026: $236K no plan disclosed$291MFebMar 2026: $26.0M under a disclosed planMarApr 2026: $22.2M under a disclosed planAprMay 2026: $18.8M under a disclosed planMay 2026: $43K to cover taxesMay 2026: $153M no plan disclosedMayJun 2026: $46K under a disclosed planJunJul 2026: $20.3M under a disclosed planJulAug 2026: $40K under a disclosed planAug 2026: $50K to cover taxesAug 2026: $276K no plan disclosedAugSep 2026: $40.3M under a disclosed planSepOct

Outside holders, reported separately

Kuo Chang, Michael Hsing and Saria Tseng reported no open-market sales in the past 12 months. Large shareholders and the funds or companies that board members represent are not part of management, so they are left out of the figures above.

Details

Common questions

Is the Monolithic Power Systems CEO selling stock?

Yes. Michael Hsing sold 302K shares ($355M) in the past 12 months, 44% of it under a trading plan disclosed in the filings.

Why are Monolithic Power Systems insiders selling?

Filings rarely give a reason, and we don't guess at one. What they show is how the sales were made: 37% of sales by value ran under 10b5-1 trading plans disclosed in the filings, 23% were to cover taxes and 40% had no disclosed plan. A trading plan schedules sales in advance.

Are any Monolithic Power Systems insiders buying?

No. Officers and directors reported no purchases in the past 12 months.

How much of their stake did Monolithic Power Systems insiders sell?

About 60% overall. As a group they ended with more shares than they started with. These figures leave out Michael Hsing, the largest holder (most holdings were last confirmed in 2015). That covers the 12 months to Oct 9, 2026 and counts vested shares reported on SEC Forms 3, 4 and 5, which is not an insider's whole wealth.

The evidence

Who sold11 officers and directors: amount, % of holdings, trading plan
Who soldAmount% of holdingsTrading plan
Michael Hsing
CEO, Director
$355M
302K shares
i
No percentage: most holdings were last confirmed in 2015.
44% under a disclosed plan, 18% to cover taxes 38% no plan disclosed
Saria Tseng
EVP & General Counsel
$151M
137K shares
95%44% under a disclosed plan, 18% to cover taxes 38% no plan disclosed
Maurice Sciammas
EVP, WW Sales & Marketing
$101M
90K shares
i
No percentage: holdings couldn't be fully reconciled.
39% under a disclosed plan, 26% to cover taxes 35% no plan disclosed
Deming Xiao
EVP, Global Operations
$76.4M
53K shares
36%35% to cover taxes 65% no plan disclosed
Theodore Blegen
EVP and CFO
$37.5M
34K shares
69%32% under a disclosed plan, 68% to cover taxes
Eugen Elmiger
Director
$19.0M
12K shares
70%No plan disclosed
Jeff Zhou
Director
$3.3M
2K shares
36%No plan disclosed
Victor Lee
Director
$2.0M
2K shares
6.8%Disclosed plan
Eileen Wynne
Director
$530K
335 shares
29%No plan disclosed
Kuo Chang
Director
$312K
300 shares
i
No percentage: most holdings were last confirmed in 2007.
No plan disclosed
Robert Dean II
Interim CFO
$234K
169 shares
2.5%40% to cover taxes 60% no plan disclosed

Sold by a charitable foundation the insider reports: Hsing Fam Foundation, reported by Michael Hsing; C&T Discovery Foundation, reported by Saria Tseng. A foundation's shares are not the insider's own stake, so they are left out of the figures above.

Board members representing outside shareholders, reported separately: Kuo Chang. Details

The full ownership picture11 of 12 insiders fully reconciled · 12 officers and directors

Vested shares across all share classes, held directly and through trusts, LLCs and family members, as reported on SEC Forms 3, 4 and 5. Unvested awards and options are never counted as owned shares.

InsiderHeld Oct 9, 2025SoldHeld Oct 9, 2026Still held
Michael Hsing
!
Most of this insider's holdings were last confirmed in 2015. Confirmed in the last three years: 964,129 shares. Not confirmed since: 2,126,806 shares, left out of this row. "Still held" is not shown because it would cover only the smaller, confirmed part.
CEO, Director
961K−302K964Ksee note
Vesting, gifts, unvested awards and holding lines for Michael Hsing
0shares vested or exercised
−12Kgifted (net of own trusts)
−122Kwithheld by the company for taxes
none reportedunvested awards, start → end
  • Additional holdings last reported more than 3 years ago are shown separately and excluded from totals.
  • Shares owned by Hsing Fam Foundation are a charitable foundation's, listed separately and not counted here.
Held throughShare classOct 9, 2025Oct 9, 2026
DirectCommon Stock814,667818,264
M Hsing 04 TrustCommon Stock133,040133,040
ZH Family 2020 TrustCommon Stock12,82512,825

Additional holdings last reported Feb 9, 2015, not confirmed since: 2,126,806 shares. Not included in any total or percentage on this page.

Reconciliation: minor difference of 30 shares. Difference is stated in footnotes (unreported vesting, exempt acquisition or transfer).

Maurice Sciammas
!
Holdings couldn't be fully reconciled. A footnote describes a transfer or distribution between related entities, but the amounts could not be matched to the balance change. Largest: +18,962 shares on Nov 13, 2025 (Various Sciammas GRATs). See the filing Sales and other transactions for Maurice Sciammas are complete.
EVP, WW Sales & Marketing
n/a−90Kn/an/a
Vesting, gifts, unvested awards and holding lines for Maurice Sciammas
0shares vested or exercised
−12Kgifted (net of own trusts)
−55Kwithheld by the company for taxes
none reportedunvested awards, start → end

Holdings couldn't be fully reconciled. A footnote describes a transfer or distribution between related entities, but the amounts could not be matched to the balance change. Largest: +18,962 shares on Nov 13, 2025 (Various Sciammas GRATs). The balances below are as reported, not verified totals.

Held throughShare classOct 9, 2025Oct 9, 2026
DirectCommon Stock102,325126,644
Sciammas Family TrustCommon Stock44,93052,586
Family TrustCommon Stock25,82025,820
GRATCommon Stock23,27023,270
Various Sciammas GRATsCommon Stock12,22836,062
Maurice Sciammas Trust FBO Oski CrewCommon Stock9,4819,481
Christina Sciammas Trust FBO Oski CrewCommon Stock9,4819,481
Clement Sciammas Family 2021 TrustCommon Stock5,0005,000
Sciammas Trust 2020Common Stock4,0154,015
Rosalind Sciammas Family 2021 TrustCommon Stock2,0002,000
Patrick Francis Sciammas 2020 Irrevocable TrustCommon Stock1,6991,699
Chloe Liliane Sciammas 2020 Irrevocable TrustCommon Stock1,6991,699
Joseph Roger Sciammas 2020 Irrevocable TrustCommon Stock1,6991,699
Clement Sciammas Brokerage AccountCommon Stock1,4991,499
Rosalind Sciammas Brokerage AccountCommon Stock1,499919
Clement Sciammas TrustCommon Stock1,4991,119
Peter Rafferty and Eric Toothill 2021TrustCommon Stock1,0001,000
Deming Xiao
i
Minor difference of 27 shares. Difference is stated in footnotes (unreported vesting, exempt acquisition or transfer). Additional holdings last reported more than 3 years ago are shown separately and excluded from totals.
EVP, Global Operations
145K−53K231K+59%
Vesting, gifts, unvested awards and holding lines for Deming Xiao
0shares vested or exercised
0gifted (net of own trusts)
−55Kwithheld by the company for taxes
none reportedunvested awards, start → end
  • Additional holdings last reported more than 3 years ago are shown separately and excluded from totals.
Held throughShare classOct 9, 2025Oct 9, 2026
DirectCommon Stock120,660205,959
SpouseCommon Stock20,45520,455
Christopher Chao Xiao TrustCommon Stock4,3364,336

Additional holdings last reported Aug 17, 2007, not confirmed since: 195,166 shares. Not included in any total or percentage on this page.

Reconciliation: minor difference of 27 shares. Difference is stated in footnotes (unreported vesting, exempt acquisition or transfer).

Saria Tseng
i
Minor difference of 30 shares. Difference is stated in footnotes (unreported vesting, exempt acquisition or transfer). Includes unvested RSUs, amount not disclosed. Additional holdings last reported more than 3 years ago are shown separately and excluded from totals. New Form 3 filed 2010-02-10; earlier filings set aside. Shares owned by C&T Discovery Foundation are a charitable foundation's, listed separately and not counted here.
EVP & General Counsel
144K−137K144K99.8%
Vesting, gifts, unvested awards and holding lines for Saria Tseng
0shares vested or exercised
−1.2Kgifted (net of own trusts)
−55Kwithheld by the company for taxes
none reportedunvested awards, start → end
  • Includes unvested RSUs, amount not disclosed.
  • Additional holdings last reported more than 3 years ago are shown separately and excluded from totals.
  • New Form 3 filed 2010-02-10; earlier filings set aside.
  • Shares owned by C&T Discovery Foundation are a charitable foundation's, listed separately and not counted here.
Held throughShare classOct 9, 2025Oct 9, 2026
Direct
includes unvested RSUs, amount not disclosed
Common Stock144,494142,218
C&T Family TrustCommon Stock02,000

Additional holdings last reported Feb 19, 2016, not confirmed since: 4,000 shares. Not included in any total or percentage on this page.

Reconciliation: minor difference of 30 shares. Difference is stated in footnotes (unreported vesting, exempt acquisition or transfer).

Theodore Blegen
i
Minor difference of 1 share. Difference is under 0.5% of holdings. Includes unvested RSUs, amount not disclosed.
EVP and CFO
49K−34K93K+91%
Vesting, gifts, unvested awards and holding lines for Theodore Blegen
0shares vested or exercised
0gifted (net of own trusts)
−48Kwithheld by the company for taxes
none reportedunvested awards, start → end
  • Includes unvested RSUs, amount not disclosed.
Held throughShare classOct 9, 2025Oct 9, 2026
Direct
includes unvested RSUs, amount not disclosed
Common Stock37,94082,353
Irrevocable Trust FBO Sarah N. BlegenCommon Stock5,3315,331
Irrevocable Trust FBO Theodore F. BlegenCommon Stock5,3315,331

Reconciliation: minor difference of 1 share. Difference is under 0.5% of holdings.

Victor Lee
Director
30K−2K28K94%
Vesting, gifts, unvested awards and holding lines for Victor Lee
0shares vested or exercised
0gifted (net of own trusts)
none reportedunvested awards, start → end
Held throughShare classOct 9, 2025Oct 9, 2026
DirectCommon Stock29,56727,756
Eugen Elmiger
Director
17K−12K5.4K31%
Vesting, gifts, unvested awards and holding lines for Eugen Elmiger
0shares vested or exercised
0gifted (net of own trusts)
none reportedunvested awards, start → end
Held throughShare classOct 9, 2025Oct 9, 2026
DirectCommon Stock17,2135,402
Robert Dean II
i
Includes unvested RSUs, amount not disclosed. Unvested RSUs stated in footnotes are excluded from owned shares. Started reporting during the period; starting holdings are from the Form 3.
Interim CFO
6.7K−1697.2K+6.7%
Vesting, gifts, unvested awards and holding lines for Robert Dean II
0shares vested or exercised
0gifted (net of own trusts)
none reportedunvested awards, start → end
  • Includes unvested RSUs, amount not disclosed.
  • Unvested RSUs stated in footnotes are excluded from owned shares.
  • Started reporting during the period; starting holdings are from the Form 3.
Held throughShare classOct 9, 2025Oct 9, 2026
Direct
includes unvested RSUs, amount not disclosed
Common Stock6,6407,089
Parent & DaughterCommon Stock6565
Jeff Zhou
Director
5.6K−2K3.8K68%
Vesting, gifts, unvested awards and holding lines for Jeff Zhou
0shares vested or exercised
0gifted (net of own trusts)
none reportedunvested awards, start → end
Held throughShare classOct 9, 2025Oct 9, 2026
DirectCommon Stock5,6113,800
Eileen Wynne
Director
1.2K−3351K87%
Vesting, gifts, unvested awards and holding lines for Eileen Wynne
0shares vested or exercised
0gifted (net of own trusts)
none reportedunvested awards, start → end
Held throughShare classOct 9, 2025Oct 9, 2026
DirectCommon Stock1,1531,007
Carintia Martinez
Director
87801.1Kno sales
Vesting, gifts, unvested awards and holding lines for Carintia Martinez
0shares vested or exercised
0gifted (net of own trusts)
none reportedunvested awards, start → end
Held throughShare classOct 9, 2025Oct 9, 2026
DirectCommon Stock8781,067
Kuo Chang
!
Most of this insider's holdings were last confirmed in 2007. Confirmed in the last three years: 515 shares. Not confirmed since: 444,148 shares, left out of this row. "Still held" is not shown because it would cover only the smaller, confirmed part.
Director
626−300515see note
Vesting, gifts, unvested awards and holding lines for Kuo Chang
0shares vested or exercised
0gifted (net of own trusts)
none reportedunvested awards, start → end
  • Additional holdings last reported more than 3 years ago are shown separately and excluded from totals.
  • Held through InveStar Excelsus; the director disclaims ownership beyond their own interest.
  • Shares held through Forefront Venture Partners, L.P, InveStar Burgeon, InveStar Dayspring Venture Capital, Inc and others belong to an outside shareholder this director represents; they are listed under "Board members representing outside shareholders", not here.
Held throughShare classOct 9, 2025Oct 9, 2026
DirectCommon Stock626515

Additional holdings last reported May 24, 2007, not confirmed since: 444,148 shares. Not included in any total or percentage on this page.

11 of 12 insiders fully reconciled: starting holdings plus reported transactions match ending holdings (7 exactly, 4 with a minor or footnoted difference). For 1 we show sales but not holdings; the ! icon on that row explains why. Percentages cover 9 of 12 officers and directors. Left out: Michael Hsing (most holdings were last confirmed in 2015); Maurice Sciammas (holdings couldn't be fully reconciled); Kuo Chang (most holdings were last confirmed in 2007). "Still held" compares ending with starting vested shares; a plus sign means the holding grew.

What explains the selling$746M of sales by plan status, purpose, seller and month

Officer and director open-market sales: $746M across 632,391 shares. Plan status and stated purpose are separate questions, and a sale can have both.

By plan status

The lighter segment is sales with no plan disclosed in the filing ($469M), including tax-related sales outside a plan.

No plan disclosed · $299M

Sales with no 10b5-1 plan and no tax reference in the filing. $133M of it is Michael Hsing. No plan disclosed is a statement about the filing, not about why the sale happened. Largest such sale: Deming Xiao, May 6, 2026

Taxes

$170M of sales (22.8%) cite tax obligations in their footnotes. Separately, 333,845 shares ($366M) were withheld by the company for taxes, which isn't a market sale. Example: Robert Dean II, Aug 24, 2026

SellerShares soldProceedsUnder a disclosed planShare of totalSales dates
Michael Hsing
CEO, Director
302K$355M44%48%Nov 11, 2025 to Sep 28, 2026
Saria Tseng
EVP & General Counsel
137K$151M44%20%Oct 15, 2025 to May 27, 2026
Maurice Sciammas
EVP, WW Sales & Marketing
90K$101M39%14%Nov 5, 2025 to Aug 3, 2026
Deming Xiao
EVP, Global Operations
53K$76.4M0%10%Feb 6, 2026 to May 6, 2026
Theodore Blegen
EVP and CFO
34K$37.5M32%5%Nov 3, 2025 to Feb 6, 2026
Eugen Elmiger
Director
12K$19.0M0%3%May 6, 2026 to May 6, 2026
Jeff Zhou
Director
2K$3.3M0%0.4%May 5, 2026 to May 26, 2026
Victor Lee
Director
2K$2.0M100%0.3%Dec 24, 2025 to Feb 9, 2026
Eileen Wynne
Director
335$530K0%0.1%May 6, 2026 to May 6, 2026
Kuo Chang
Director
300$312K0%0.0%Nov 21, 2025 to Aug 24, 2026
Robert Dean II
Interim CFO
169$234K0%0.0%May 18, 2026 to Aug 24, 2026

Sales by month

MonthSale proceedsDisclosed planTo cover taxesNo plan disclosed
Oct 2025$18.6M$18.6M$0$0
Nov 2025$148M$3.1M$0$145M
Dec 2025$3.7M$3.7M$0$0
Jan 2026$3.4M$3.4M$0$0
Feb 2026$291M$121M$170M$236K
Mar 2026$26.0M$26.0M$0$0
Apr 2026$22.2M$22.2M$0$0
May 2026$172M$18.8M$43K$153M
Jun 2026$46K$46K$0$0
Jul 2026$20.3M$20.3M$0$0
Aug 2026$367K$40K$50K$276K
Sep 2026$40.3M$40.3M$0$0
Oct 2026$0$0$0$0
Board members representing outside shareholders (1)Listed and sourced; not part of the management totals or the answer line

Directors whose reported holdings sit mostly in an investment fund or a corporate shareholder they represent, not in their own name, with beneficial ownership disclaimed except for their own financial interest. Listed and sourced here; not part of the management totals or the answer line. Shares a fund hands to its own investors are distributions, not sales.

Board memberHeld Oct 9, 2025SoldHeld Oct 9, 2026Still held
Kuo Chang
!
Most of this insider's holdings were last confirmed in 2005. Confirmed in the last three years: 0 shares. Not confirmed since: 1,308,637 shares, left out of this row. "Still held" is not shown because it would cover only the smaller, confirmed part.
Director
000see note
Vesting, gifts, unvested awards and holding lines for Kuo Chang
0shares vested or exercised
0gifted (net of own trusts)
none reportedunvested awards, start → end
  • Additional holdings last reported more than 3 years ago are shown separately and excluded from totals.

Additional holdings last reported Aug 26, 2005, not confirmed since: 1,308,637 shares. Not included in any total or percentage on this page.

Is this normal? Selling year by year5 earlier years to compare with

More than usual: about 1.5x the 5-year average. 11 insiders sold; the average is 8 a year.

12 months endingShares soldInsiders who soldProceeds
Oct 9, 2026
Latest 12 months
632K11$746M
Oct 9, 2025
1 year earlier
152K9$118M
Oct 9, 2024
2 years earlier
446K8$302M
Oct 10, 2023
3 years earlier
401K7$184M
Oct 10, 2022
4 years earlier
289K7$127M
Oct 10, 2021
5 years earlier
762K8$281M

Open-market sales (Form 4 code S) by people who were officers or directors, in split-adjusted shares. Earlier years include people who have since left. A sale that an outside holder also reports (a family trust, a fund) is counted with outside holders in every year. Shares, not dollars, are compared, so a change in the stock price doesn't look like a change in selling. Years the filings don't fully cover are shown but left out of the average.

Known gaps and uncertainty1 insider whose holdings couldn't be fully reconciled

Maurice Sciammas: holdings couldn't be fully reconciled (difference of 18,985 shares). A footnote describes a transfer or distribution between related entities, but the amounts could not be matched to the balance change. Largest: +18,962 shares on Nov 13, 2025 (Various Sciammas GRATs). Filing, Nov 13, 2025

Footnote: "4,530 shares were transferred from two GRATs, on which the reporting person is a Trustee, to the Sciammas Family Trust, on which the reporting person is a Trustee. No funds were exchanged, and no sale of shares occurred in the transfer."

Michael Hsing: minor difference of 30 shares. Difference is stated in footnotes (unreported vesting, exempt acquisition or transfer).

Deming Xiao: minor difference of 27 shares. Difference is stated in footnotes (unreported vesting, exempt acquisition or transfer).

Saria Tseng: minor difference of 30 shares. Difference is stated in footnotes (unreported vesting, exempt acquisition or transfer).

Theodore Blegen: minor difference of 1 share. Difference is under 0.5% of holdings.

Inferred rename: "Michael Hsing 2004 Trust" is treated as the same holder as "Sharon Hsing 2004 Trust", because the old name was never reported again and the new one opened with the same balance (382,500 shares). Old name, new name

Inferred rename: "InveStar Excelsus Venture Capital (Int'l) Inc., LDC" is treated as the same holder as "InveStar Excelsus Venture Capital (International) Inc., LDC", because the old name was never reported again and the new one opened with the same balance (182,238 shares). Old name, new name

Inferred rename: "C Squared Investment Corp" is treated as the same holder as "C Squared Invest", because the old name was never reported again and the new one opened with the same balance (30,386 shares). Old name, new name

Inferred rename: "InveStar Burgeon Venture Capital, Inc" is treated as the same holder as "InveStar Burgeon", because the old name was never reported again and the new one opened with the same balance (677,671 shares). Old name, new name

Inferred rename: "InveStar Excelsus Venture Capital (International) Inc., LDC" is treated as the same holder as "InveStar Excelsus", because the old name was never reported again and the new one opened with the same balance (313,193 shares). Old name, new name

Inferred rename: "InveStar Semiconductor Development Fund, Inc" is treated as the same holder as "InveStar SemiDev1", because the old name was never reported again and the new one opened with the same balance (1,974,690 shares). Old name, new name

Inferred rename: "InveStar Semiconductor Development Fund, Inc (II) LDC" is treated as the same holder as "InveStar SemiDev2", because the old name was never reported again and the new one opened with the same balance (864,489 shares). Old name, new name

Inferred rename: "Family Trust" is treated as the same holder as "S. Tseng Charity Fung", because the old name was never reported again and the new one opened with the same balance (2,000 shares). Old name, new name

Inferred rename: "Sciammas Trst 2020" is treated as the same holder as "Sciammas Trust 2020", because the old name was never reported again and the new one opened with the same balance (14,000 shares). Old name, new name

Inferred rename: "Clement Sciammas (Sibling) Brokerage Account" is treated as the same holder as "Clement Sciammas Brokerage Account", because the old name was never reported again and the new one opened with the same balance (1,499 shares). Old name, new name

Inferred rename: "Clement Sciammas Brokerage Account" is treated as the same holder as "Clement Sciammas Trust", because the old name was never reported again and the new one opened with the same balance (1,499 shares). Old name, new name

External context: we only cite outside events when a documented connection exists. None is shown for this period.

Sources and methodology2,222 filings from SEC EDGAR, and how we read them

All 2,222 Forms 3, 4 and 5 filed for Monolithic Power Systems (SEC CIK 1280452) from Nov 18, 2004 to Sep 30, 2026, retrieved from SEC EDGAR on Oct 9, 2026. Prices are the ones reported in each filing, often weighted averages.

Holdings. Each holding line (a share class plus an owner, such as a trust or LLC) carries its last reported balance forward. Entities first reported during the period start at zero, so transfers between an insider's own trusts don't count as selling. Lines not reported for three years or more are listed separately and left out of totals.

Sales. A sale counts as under a 10b5-1 plan if its footnote cites one or the filing's Rule 10b5-1 box is checked, and as tax-related if its footnote cites tax obligations or sell-to-cover. Shares withheld by the company for taxes are listed separately. Sales with neither attribute are labeled "no plan disclosed".

Full methodology

Former or inactive filers (14)No filing in 18 months; last reported balances, not in any total
NameLast filedLast reported balance
James MoyerAug 29, 20241,106,509 shares, last reported balance as of Aug 29, 2024
James MoyerAug 29, 2024No balance on record
Pilkington Smith-Apr 29, 201622,996 shares, last reported balance as of Apr 28, 2016
Meera RaoFeb 9, 2016243,534 shares, last reported balance as of Feb 8, 2016
Douglas McBurnieMay 23, 2014No balance on record
Paul UeuntenFeb 6, 2013429,501 shares, last reported balance as of Feb 4, 2013
Umesh PadvalFeb 10, 20115,700 shares, last reported balance as of Feb 8, 2011
Rick NeelyDec 8, 201028,125 shares, last reported balance as of Dec 8, 2010
Adriana ChiocchiOct 5, 20097,500 shares, last reported balance as of Oct 5, 2009
Alan EarhartFeb 18, 2009No balance on record
Jim Jones IIIJun 23, 2006No balance on record
Jim Jones IIIJun 23, 20062,120,356 shares, last reported balance as of Jun 21, 2006
Tim ChristoffersenSep 8, 200512,500 shares, last reported balance as of Sep 6, 2005
BAVP, L.P.Nov 29, 20042,298,185 shares, last reported balance as of Nov 24, 2004

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