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.
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
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
Investment Themes
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 | ||||
|---|---|---|---|---|---|
Sep 10, 2026 21d ago | Press Release | $1,234.46 $1,217.80 | ▼ −1.35% | ▼ −1.13% | $1,427.84 (+15.67%) |
Aug 26, 2026 5w ago | Insider Cluster | $1,311.08 $1,213.65 | ▼ −7.43% | ▼ −7.70% | $1,427.84 (+8.91%) |
Aug 26, 2026 5w ago | Insider Cluster | $1,311.08 $1,219.36 | ▼ −7.00% | ▼ −6.23% | $1,427.84 (+8.91%) |
Aug 24, 2026 5w ago | Court Ruling | $1,285.03 $1,261.99 | ▼ −1.79% | ▼ −2.26% | $1,427.84 (+11.11%) |
Aug 13, 2026 7w ago | Insider Cluster | $1,362.55 $1,310.60 | ▼ −3.81% | ▼ −1.85% | $1,427.84 (+4.79%) |
Aug 6, 2026 8w ago | Insider Cluster | $1,350.21 $1,358.05 | ▲ +0.58% | ▼ −0.63% | $1,427.84 (+5.75%) |
Jul 30, 2026 9w ago | 8-K | $1,426.03 $1,391.91 | ▼ −2.39% | ▼ −5.90% | $1,427.84 (+0.13%) |
Jun 12, 2026 15w ago | Press Release | $1,652.29 $1,537.88 | ▼ −6.92% | ▼ −5.54% | $1,427.84 (−13.58%) |
Jun 3, 2026 17w ago | Insider Cluster | $1,650.98 $1,589.55 | ▼ −3.72% | ▼ −1.17% | $1,427.84 (−13.52%) |
May 29, 2026 17w ago | Insider Cluster | $1,537.90 $1,481.05 | ▼ −3.70% | ▼ −0.95% | $1,427.84 (−7.16%) |
US Market Status
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