Monolithic Power Systems, Inc.
Monolithic Power Systems, Inc. (MPWR) Insider Trading
Form 4 buy vs sell counts, ratio, and sentiment — switch this quarter or last 12 months; chart and transactions below.
SEC EDGAR · FMP · MPWR · as of Jun 8, 2026
Activity summary
Buy transactions
0
P-Purchase only
Sell transactions
335
12 Months
Buy/Sell ratio
0.00
Buy/Sell (by trades)
Overall sentiment
Monolithic Power Systems, Inc. insiders have been primarily selling shares over the past 12 Months. Selling activity is often driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment toward the company.
▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · Buy = P-Purchase only · Sell = S-Sale only
As of Jun 8, 2026
MPWR insider buying and selling by quarter
MPWR insider selling · MPWR insider buying stocks · quarterly insider activity
Mobile shows last 4Q · Desktop shows full 8Q
▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · last 8 quarters
As of Jun 8, 2026
Active insiders
Most active in past 12 months · MPWR ceo insider trading
Showing all insiders · Click a card to filter the transactions table below
▸ Aggregated from reportingName · top 5 by trade count (12M) · no extra API
Recent insider transactions
MPWR executive sell shares · MPWR board member insider trading · MPWR insider trading SEC filing
Scroll horizontally to see all columns
| Date | Insider | Type | Shares | Value | Filing |
|---|---|---|---|---|---|
| Jun 1, 2026 | Sciammas Maurice EVP, WW Sales & Marketing | Sale | 30 | $46K | Form 4 |
| May 29, 2026 | Sciammas Maurice EVP, WW Sales & Marketing | Gift | 12,472 | — | Form 4 |
| May 27, 2026 | Tseng Saria EVP & General Counsel | Sale | 7,565 | $12.86M⚡ | Form 4 |
| May 26, 2026 | DEAN ROBERT W II Interim CFO | Sale | 22 | $36K | Form 4 |
| May 26, 2026 | Zhou Jeff Director | Sale | 486 | $816K | Form 4 |
| May 22, 2026 | Tseng Saria EVP & General Counsel | Gift | 200 | — | Form 4 |
| May 22, 2026 | Tseng Saria EVP & General Counsel | Sale | 5,000 | $7.93M⚡ | Form 4 |
| May 18, 2026 | Hsing Michael CEO · Director | Sale | 3,424 | $5.01M⚡ | Form 4 |
| May 18, 2026 | Hsing Michael CEO · Director | Sale | 5,819 | $8.54M⚡ | Form 4 |
| May 18, 2026 | Hsing Michael CEO · Director | Sale | 5,049 | $7.44M⚡ | Form 4 |
| May 18, 2026 | Hsing Michael CEO · Director | Sale | 4,082 | $6.03M⚡ | Form 4 |
| May 18, 2026 | Hsing Michael CEO · Director | Sale | 5,737 | $8.51M⚡ | Form 4 |
| May 18, 2026 | Hsing Michael CEO · Director | Sale | 6,688 | $9.94M⚡ | Form 4 |
| May 18, 2026 | Hsing Michael CEO · Director | Sale | 862 | $1.29M⚡ | Form 4 |
| May 18, 2026 | Hsing Michael CEO · Director | Sale | 608 | $912K | Form 4 |
| May 18, 2026 | Hsing Michael CEO · Director | Sale | 2,929 | $4.40M⚡ | Form 4 |
| May 18, 2026 | Hsing Michael CEO · Director | Sale | 3,769 | $5.68M⚡ | Form 4 |
| May 18, 2026 | Hsing Michael CEO · Director | Sale | 551 | $834K | Form 4 |
| May 18, 2026 | Hsing Michael CEO · Director | Sale | 352 | $534K | Form 4 |
| May 18, 2026 | Hsing Michael CEO · Director | Sale | 130 | $198K | Form 4 |
| May 18, 2026 | DEAN ROBERT W II Interim CFO | Sale | 4 | $6K | Form 4 |
| May 15, 2026 | Sciammas Maurice EVP, WW Sales & Marketing | Sale | 3,741 | $5.80M⚡ | Form 4 |
| May 15, 2026 | Sciammas Maurice EVP, WW Sales & Marketing | Sale | 1,717 | $2.67M⚡ | Form 4 |
| May 15, 2026 | Sciammas Maurice EVP, WW Sales & Marketing | Sale | 2,010 | $3.14M⚡ | Form 4 |
| May 15, 2026 | Sciammas Maurice EVP, WW Sales & Marketing | Sale | 2,020 | $3.17M⚡ | Form 4 |
Sciammas Maurice
EVP, WW Sales & Marketing
Date
Jun 1
Shares
30
Price
$1533.95
Value
$46K
Sciammas Maurice
EVP, WW Sales & Marketing
Date
May 29
Shares
12,472
Price
—
Value
—
Tseng Saria
EVP & General Counsel
Date
May 27
Shares
7,565
Price
$1700.00
Value
$12.86M ⚡
Tseng Saria
EVP & General Counsel
Date
May 22
Shares
5,000
Price
$1586.43
Value
$7.93M ⚡
Hsing Michael
CEO · Director
Date
May 18
Shares
3,424
Price
$1462.61
Value
$5.01M ⚡
Hsing Michael
CEO · Director
Date
May 18
Shares
5,819
Price
$1467.62
Value
$8.54M ⚡
Hsing Michael
CEO · Director
Date
May 18
Shares
5,049
Price
$1472.84
Value
$7.44M ⚡
Hsing Michael
CEO · Director
Date
May 18
Shares
4,082
Price
$1476.96
Value
$6.03M ⚡
Hsing Michael
CEO · Director
Date
May 18
Shares
5,737
Price
$1482.51
Value
$8.51M ⚡
Hsing Michael
CEO · Director
Date
May 18
Shares
6,688
Price
$1486.76
Value
$9.94M ⚡
Hsing Michael
CEO · Director
Date
May 18
Shares
2,929
Price
$1503.05
Value
$4.40M ⚡
Hsing Michael
CEO · Director
Date
May 18
Shares
3,769
Price
$1507.70
Value
$5.68M ⚡
Sciammas Maurice
EVP, WW Sales & Marketing
Date
May 15
Shares
3,741
Price
$1550.36
Value
$5.80M ⚡
Sciammas Maurice
EVP, WW Sales & Marketing
Date
May 15
Shares
1,717
Price
$1557.48
Value
$2.67M ⚡
Sciammas Maurice
EVP, WW Sales & Marketing
Date
May 15
Shares
2,010
Price
$1562.01
Value
$3.14M ⚡
Sciammas Maurice
EVP, WW Sales & Marketing
Date
May 15
Shares
2,020
Price
$1567.15
Value
$3.17M ⚡
⚡ = value ≥ $1M · Award/Option price shows — · formType=4 · securityName=Common Stock · url → sec.gov/Archives/edgar
▸ Source: SEC EDGAR · Form 4 filings · ⚡ = value ≥ $1M · Award/Option price shows —
About MPWR insider trading
MPWR insider trades
Monolithic Power Systems, Inc. (MPWR) insider trading data is sourced from SEC Form 4 filings submitted by corporate insiders, including Tseng Saria (EVP & General Counsel), Hsing Michael (CEO · Director), Sciammas Maurice (EVP, WW Sales & Marketing). Over the past 12 months, 5 insiders have filed transactions with the SEC. MPWR insiders have been primarily selling, which may reflect pre-scheduled Rule 10b5-1 plan executions.
For Monolithic Power Systems, Inc.'s institutional ownership breakdown and insider ownership percentage, see the Ownership tab → Ownership tab →
Frequently asked questions
MPWR insider trading · 5 questionsThe insiders of Monolithic Power Systems, Inc. (MPWR) include executives and directors such as Tseng Saria (EVP & General Counsel), Hsing Michael (CEO · Director), Sciammas Maurice (EVP, WW Sales & Marketing), among others. Over the past 12 months, 5 insiders have filed Form 4 transactions with the SEC. Insider transactions are required to be reported within 2 business days of the trade date.
▸ Source: FMP /stable/insider-trading/search · SEC EDGAR Form 3 & 4 · acquisitionOrDisposition A=Buy, D=Sell · RSU vesting (M-Exempt) excluded from sentiment bar · As of Jun 8, 2026