MPWR MONOLITHIC POWER SYSTEMS INC
Price Chart
Executive Summary
Four MPWR insiders, including CEO Michael Hsing and EVP Saria Tseng, sold a total of $18.75M in open-market transactions over the past week. The sales represent ~0.023% of the company's $81.7B market cap, well below the 0.1% threshold for materiality. This cluster is likely driven by routine portfolio diversification or 10b5-1 plans, especially given the existing pattern of insider selling (7 sells totaling $20.6M in the past 30 days). No bearish signal is warranted.
Key Financial Metrics
Actionable Insight
Insider selling is routine and tiny relative to market cap — no directional signal. Monitor for any change in selling velocity or emergence of open-market insider buying, which would be a more informative signal per academic literature.
Key Facts
- CEO Michael Hsing sold 3,400 shares for $5.01M on 2026-05-18 at ~$1,462.61/share.
- EVP & General Counsel Saria Tseng sold 5,000 shares for $7.93M on 2026-05-22 at ~$1,586.43/share.
- EVP WW Sales & Marketing Maurice Sciammas sold 3,700 shares for $5.80M on 2026-05-15.
- Interim CFO Robert W. Dean II sold 4 shares for $6K on 2026-05-18.
- Total cluster value ($18.75M) is ~0.023% of MPWR's $81.7B market cap — well below the 0.1% materiality threshold.
- Prior 30-day insider activity showed 7 sells totaling $20.6M, consistent with routine selling patterns.
Financial Impact
$18.75M in total insider sales, negligible relative to $81.7B market cap
Risk Factors
- Insider selling could accelerate if fundamental headwinds emerge, but current activity is noise.
- No evidence of 10b5-1 plan disclosures, but the pattern is consistent with scheduled selling.
Market Snapshot
Documents Analyzed
This report is based on 1 SEC document filed with EDGAR.
| Document | Accession Number |
|---|---|
| CLUSTER Data (Synthetic) | cluster-MPWR-1779916061038 |
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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