MPWR MONOLITHIC POWER SYSTEMS INC
Price Chart
Executive Summary
CEO Michael Hsing and EVP Maurice Sciammas sold a combined $10.8M in MPWR stock within a week, representing ~0.015% of the $72.1B market cap. The CEO's $5M sale is the largest insider disposition in the trailing 30-day period ($19M total). While the dollar amount is trivial relative to market cap, the cluster involves the two most senior executives selling simultaneously, which warrants attention.
Key Financial Metrics
Actionable Insight
The CEO and top sales executive selling simultaneously is a pattern to flag, but the dollar amount is too small to move a $72B stock. Monitor for any upcoming earnings pre-announcement or guidance change — the cluster may reflect personal portfolio rebalancing rather than a bearish signal. The historical win rate on MPWR reports is 100%, but this cluster is too small to act on.
Key Facts
- CEO Michael Hsing sold 3,424 shares at $1,462.61 for $5.01M on 2026-05-18
- EVP Maurice Sciammas sold 3,741 shares at $1,550.36 for $5.80M on 2026-05-15
- Interim CFO Robert Dean sold 4 shares at $1,563.28 for $6K on 2026-05-18
- Total cluster value: $10.81M, representing ~0.015% of $72.1B market cap
- Trailing 30-day insider activity: 8 sells totaling $19.0M
- All sales are open-market (code S) — no 10b5-1 plan designation noted
Financial Impact
$10.81M in insider sales, 0.015% of market cap — immaterial relative to company size
Risk Factors
- CEO selling $5M could signal personal bearishness, but amount is trivial relative to his likely holdings
- No 10b5-1 plan disclosed — sales may be opportunistic or liquidity-driven
- Cluster occurs after a strong stock run (MPWR up ~19% in prior month per historical data)
Market Snapshot
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CLUSTER Data (Synthetic) | cluster-MPWR-1779322256425 |
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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