MPWR MONOLITHIC POWER SYSTEMS INC
Price Chart
Executive Summary
Two MPWR insiders (EVP & General Counsel Saria Tseng and Director Jeff Zhou) sold a total of $8.75M in open-market sales over a 5-day window, with Tseng's $7.93M sale dominating. The total represents ~0.01% of MPWR's $81.7B market cap, well below the 0.1% materiality threshold for insider sales. Per academic literature, cluster sales are not reliably informative — the timing likely reflects routine portfolio rebalancing or blackout-window openings, not a shared bearish view. The historical calibration shows past MPWR reports have been highly accurate (100% win rate at T+20), but this cluster is too small to warrant a directional call.
Key Financial Metrics
Actionable Insight
The cluster is too small relative to market cap to be material. Insider sales at MPWR have been routine (7 sells for $20.9M in the prior 30 days). No C-suite participation and no 10b5-1 plan disclosures — treat as noise. Monitor next 8-K or earnings for any fundamental change, but this filing alone does not warrant a trading action.
Key Facts
- EVP & General Counsel Saria Tseng sold 5,000 shares at $1,586.43 for $7.93M on 2026-05-22
- Director Jeff Zhou sold 486 shares at $1,680.00 for $816K on 2026-05-26
- Total open-market sales: $8.75M, representing ~0.01% of MPWR's $81.7B market cap
- Tseng also made a non-cash gift of 200 shares ($0 value) on 2026-05-22
- No C-suite (CEO/CFO) participation — sales limited to General Counsel and a Director
- Prior 30-day insider activity: 7 sells totaling $20.9M, consistent with ongoing routine selling
Financial Impact
$8.75M in open-market sales, ~0.01% of market cap — trivial relative to company size
Risk Factors
- Insider sales could accelerate if management perceives headwinds in the semiconductor cycle
- No CEO/CFO selling — risk of misinterpretation as bearish signal when it is likely routine
Market Snapshot
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CLUSTER Data (Synthetic) | cluster-MPWR-1779924523838 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
|
Jun 3, 2026
6d ago
|
Insider Cluster
| $1,650.98 $1,476.57 | ▼ −10.56% | ▼ −7.97% | $1,559.18 (−5.56%) |
|
May 29, 2026
11d ago
|
Insider Cluster
| $1,537.90 $1,625.47 | ▲ +5.69% | ▲ +5.55% | $1,559.18 (+1.38%) |
|
May 29, 2026
11d ago
|
Insider Cluster
| $1,537.90 $1,625.47 | ▲ +5.69% | ▲ +5.55% | $1,559.18 (+1.38%) |
|
May 28, 2026
12d ago
|
Insider Cluster
| $1,562.07 $1,537.90 | ▼ −1.55% | ▼ −1.81% | $1,559.18 (−0.18%) |
|
May 27, 2026
13d ago
|
Insider Cluster
| $1,632.36 $1,562.07 | ▼ −4.31% | ▼ −4.55% | $1,559.18 (−4.48%) |
|
May 27, 2026
13d ago
|
Insider Cluster
| $1,632.36 $1,562.07 | ▼ −4.31% | ▼ −4.55% | $1,559.18 (−4.48%) |
|
May 21, 2026
20d ago
|
Insider Cluster
| $1,553.55 $1,588.88 | ▲ +2.27% | ▲ +1.83% | $1,559.18 (+0.36%) |
|
May 20, 2026
20d ago
|
Insider Cluster
| $1,553.55 $1,588.88 | ▲ +2.27% | ▲ +1.83% | $1,559.18 (+0.36%) |
|
May 8, 2026
4w ago
|
Insider Cluster
| $1,653.69 $1,592.75 | ▼ −3.69% | ▼ −3.55% | $1,559.18 (−5.72%) |
|
May 8, 2026
4w ago
|
Insider Cluster
| $1,653.69 $1,592.75 | ▼ −3.69% | ▼ −3.55% | $1,559.18 (−5.72%) |
US Market Status
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