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Stock brief · the live tape
MPWRMonolithic Power Systems, Inc.
Information Technology
$1,256.26
▲ $7.50 (+0.6%) · 30dclose Friday, August 28, 2026
Disclosed flow is mixed.
5 members · 9 disclosed trades · 77 insider filings
The Hill
▲ 5▼ 4
5 buys · 4 sellsThe Boardroom
▲ 3▼ 74
3 buys · 74 sells · 77 filingsFeeding Time13F lens lands with fund ingestion
What is behind it
Recent Signal Scores, decayed48
Events counted, 90d31
Net congressional flowselling
The tape
Price with a twin dot per disclosed trade: filled at the trade, hollow at the filing. The dashed gap is what the market did in between, not anyone’s return.
trade (congress)filingtrade (insider)call legput leg
The cost of chasing
Each rail runs from their trade to their filing. The hatched part is the move a copier missed to the disclosure lag; the solid part is what copying at the filing kept.
Donalds-15.2-7.1
Donalds-15.2-7.1
Mullin+10.5+9.9
Mullin+31.5+10.5
Mullin+31.5+10.5
Guest+21.8+42.0
Bresnahan+176.0+96.3
Bresnahan+113.9+79.5
Median copy kept +10.5% from the filing vs +26.7% from the trade date; the lag took 16.2 pts. The S&P returned +12.1% over the same windows. Numbers describe the window shown; they are not a forecast.
Who is behind it
Congress members with a disclosed position, biggest first. Click through to their dossier.
Markwayne MullinSenateFiled this one in 26dbought$98KByron DonaldsHouse · Oversight & Government Reform · Financial ServicesFiled this one in 40dsold$16KRobert P. Bresnahan, Jr.House · Transportation & Infrastructure · AgricultureFiled this one in 30dmixed$16KTommy TubervilleSenate · Agriculture, Nutrition & Forestry · Armed ServicesFiled this one in 824dsold$8KMichael GuestHouse · Appropriations · Homeland SecurityFiled this one in 30dbought$8K
Committee overlap is a fact, not an accusation. An option leg behind a share buy reads very differently from a plain purchase, so it is called out but never scored as intent.
The boardroom
Scheduled 10b5-1 sales are usually noise, set on autopilot months ago. The unscheduled ones are the tell.
DEAN ROBERT W IIInterim CFOUnscheduled
CHANG KUO WEI HERBERTDirectorUnscheduled
DEAN ROBERT W IIInterim CFOUnscheduled
Sciammas MauriceEVP, WW Sales & MarketingUnscheduled
Sciammas MauriceEVP, WW Sales & MarketingUnscheduled
Sciammas MauriceEVP, WW Sales & MarketingScheduled · 10b5-1
DEAN ROBERT W IIInterim CFOUnscheduled
Sciammas MauriceEVP, WW Sales & MarketingScheduled · 10b5-1
Sciammas MauriceEVP, WW Sales & MarketingScheduled · 10b5-1
Sciammas MauriceEVP, WW Sales & MarketingScheduled · 10b5-1
Sciammas MauriceEVP, WW Sales & MarketingScheduled · 10b5-1
Sciammas MauriceEVP, WW Sales & MarketingScheduled · 10b5-1
Sciammas MauriceEVP, WW Sales & MarketingScheduled · 10b5-1
Sciammas MauriceEVP, WW Sales & MarketingScheduled · 10b5-1
Sciammas MauriceEVP, WW Sales & MarketingScheduled · 10b5-1
Sciammas MauriceEVP, WW Sales & MarketingScheduled · 10b5-1
Sciammas MauriceEVP, WW Sales & MarketingScheduled · 10b5-1
Sciammas MauriceEVP, WW Sales & MarketingScheduled · 10b5-1
Sciammas MauriceEVP, WW Sales & MarketingScheduled · 10b5-1
Sciammas MauriceEVP, WW Sales & MarketingScheduled · 10b5-1
Sciammas MauriceEVP, WW Sales & MarketingScheduled · 10b5-1
Sciammas MauriceEVP, WW Sales & MarketingScheduled · 10b5-1
Sciammas MauriceEVP, WW Sales & MarketingScheduled · 10b5-1
Sciammas MauriceEVP, WW Sales & MarketingScheduled · 10b5-1
Sciammas MauriceEVP, WW Sales & MarketingScheduled · 10b5-1
Sciammas MauriceEVP, WW Sales & MarketingScheduled · 10b5-1
Sciammas MauriceEVP, WW Sales & MarketingScheduled · 10b5-1
Sciammas MauriceEVP, WW Sales & MarketingUnscheduled
Tseng SariaEVP & General CounselUnscheduled
DEAN ROBERT W IIInterim CFOUnscheduled
Zhou JeffDirectorUnscheduled
Tseng SariaEVP & General CounselUnscheduled
Tseng SariaEVP & General CounselUnscheduled
Hsing MichaelCEO, DirectorUnscheduled
Hsing MichaelCEO, DirectorUnscheduled
Hsing MichaelCEO, DirectorUnscheduled
Hsing MichaelCEO, DirectorUnscheduled
Hsing MichaelCEO, DirectorUnscheduled
Hsing MichaelCEO, DirectorUnscheduled
Hsing MichaelCEO, DirectorUnscheduled
The forward book
Every disclosed option leg on this ticker: what was filed, and where the strike sits versus today.
No disclosed option legs on MPWR yet. They plot here the day they file.
A call and a put are shown as filed. We do not infer whether a leg is a hedge or a leveraged bet, because the filing does not say. Read the strike and expiry, not an implied intent.
The fund book
Tracked 13F holders and how their position moved, quarter over quarter.
13F fund positions on MPWR light up when fund ingestion lands. Quarter-end marks, up to 45 days lagged, never live holdings.
Cross-check
When different sources file on the same name inside a window. Overlap like this is rare.
- Tommy TubervilleSenate · Agriculture, Nutrition & Forestry · Armed Services▼
- Byron DonaldsHouse · Oversight & Government Reform · Financial Services▼
- DEAN ROBERT W IIInterim CFO▼
- CHANG KUO WEI HERBERTDirector▼
- Sciammas MauriceEVP, WW Sales & Marketing▲
- Tseng SariaEVP & General Counsel▼
Last 90 days · 6 filers converging
Sources file on different clocks; an overlap like this is rare.
⚠️ Public information, sourced from STOCK Act, Form 4 and 13F filings. Ranges use midpoints. Price paths between a trade and its filing are market moves, not anyone’s return. Not financial advice.