Companies / Monolithic Power Systems Inc

Monolithic Power Systems Inc

Nasdaq: MPWRCIK 1280452Information TechnologyWEST PALM BEACH, FLmonolithicpower.com ↗

Financials · FY2025

Revenue$2.79B
Net income$621.48M
Total debt—
Cash$1.01B
Diluted EPS$12.86
Shares outstanding49.1M

Ownership

49.1M shares outstanding · as of Jul 29, 2026
3.0%Insiders
Ownership
Insiders2.99%1,470,477
10%+ / strategic30.46%14,967,185
Institutions76.70%37,694,208
Public float0.00%0

Reported holdings exceed shares outstanding — public float shown as 0; some positions may overlap or lag.

% of common shares outstanding (exact, from the latest cover-page filing). Institutions are quarterly 13F snapshots; insiders reflect current officers & directors.

Insiders 12

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Insider% of sharesShares
Hsing MichaelCEOCEO · Director
1.73%848,263
Sciammas MauriceEVP, WW Sales & Marketing
0.47%232,390
Xiao DemingEVP, Global Operations
0.42%205,959
Tseng SariaEVP & General Counsel
0.29%144,218
Blegen TheodoreFormerEVP and CFO
0.17%82,353
Lee Victor KDirector
0.06%27,756
Dean Robert W IIFormerInterim CFO
0.01%5,878
Elmiger Eugen JDirector
0.01%5,402
Zhou JeffDirector
<0.01%3,800
Martinez CarintiaDirector
<0.01%1,067

Institutional holders 1,075

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HolderValue% of shares
BlackRock, Inc.$7.73B11.37%
Vanguard Group Inc$5.47B12.28%
Fmr LLC$3.60B8.09%
State Street Corporation$3.16B4.64%
Geode Capital Management, LLC$1.56B2.91%
Invesco Ltd.$1.30B2.92%
Franklin Resources, Inc.$951.14M2.14%
Norges Bank$658.66M1.48%
First Trust Advisors LP$646.56M1.20%
Morgan Stanley$588.29M1.32%

Activity

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InsidersInstitutions
What insiders are doing in this stock (Form 4).
DateActorActionSecurityValueShares ΔPosition afterImpact
Feb 6, 2026Hsing Michael
CEO
SellCommon Stock$64.32M-55K
-5.27%
988,234
2.01% of shares
high
Feb 6, 2026Sciammas Maurice
Executive
SellCommon Stock$26.79M-23K
-11.35%
178,625
0.36% of shares
high
Feb 6, 2026Tseng Saria
Executive
SellCommon Stock$26.79M-23K
-10.23%
200,626
0.41% of shares
high
Feb 6, 2026Xiao Deming
Executive
SellCommon Stock$26.79M-23K
-8.84%
235,932
0.48% of shares
high
Feb 6, 2026Blegen Theodore
Executive
SellCommon Stock$25.44M-22K
-20.87%
82,353
0.17% of shares
high
May 6, 2026Xiao Deming
Executive
SellCommon Stock$23.42M-14K
-6.09%
218,463
0.44% of shares
high
May 6, 2026Xiao Deming
Executive
SellCommon Stock$19.23M-12K
-5.31%
206,866
0.42% of shares
high
Feb 10, 2026Hsing Michael
CEO
SellCommon Stock$18.36M-16K
-1.64%
961,527
1.96% of shares
high

5%+ ownership events

Schedule 13D / 13G
FilerStance% of classSharesDate
Vanguard Group IncPassive13G/A—0—
BlackRock, Inc.Passive13G/A—4,899,383—
Fmr LLCPassive13G/A—3,977,008—
Vanguard Portfolio ManagementPassive13G—2,528,928—
Vanguard Capital ManagementPassive13G—3,561,866—

Securities

via CUSIP / OpenFIGI
SymbolTypeMarketCUSIPFIGI
MPWR——609839105—