NASDAQ ยท Technology

MPWRInsider activity

Monolithic Power Systems Inc

Priced common-share disposals outweigh acquisitions across the participating insiders.

Terminal chart โ†—Weekly report โ†—Factor research โ†—

90-day window ยท 14 Jul 2026 โ€“ 11 Oct 2026 ยท latest transaction 28 Sep 2026

Usable events 32 priced common-share records
Named participants 4 in the usable evidence
Recent acquirers 0 distinct people ยท latest 14 days
Repeat acquirers 0 at least two transaction dates
Acquisition value $0 usable, deduplicated records
Disposal value $61.0M usable, deduplicated records
Activity and market context

Disposals meet price strength

Price has risen despite the disposal tilt. Sales may reflect plans, taxes or diversification; the feed cannot establish motive.

Up to three years of weekly prices

Price alongside insider activity

Markers show usable transactions in their calendar week. They are not filing timestamps and do not establish what the market knew at the time. Event coverage is the latest 90 days.

Select a point, or focus the chart and use the arrow keys.
Weekly close Acquisition event Disposal event

View chart values
Week Close Acquisitions Disposals
2023-10-20 412.35 0 0
2023-10-27 398.50 0 0
2023-11-03 483.91 0 0
2023-11-10 495.34 0 0
2023-11-17 530.14 0 0
2023-11-24 539.38 0 0
2023-12-01 549.37 0 0
2023-12-08 565.19 0 0
2023-12-15 621.72 0 0
2023-12-22 606.33 0 0
2023-12-29 620.21 0 0
2024-01-05 564.37 0 0
2024-01-12 569.06 0 0
2024-01-19 620.75 0 0
2024-01-26 591.07 0 0
2024-02-02 625.21 0 0
2024-02-09 739.71 0 0
2024-02-16 718.26 0 0
2024-02-23 709.05 0 0
2024-03-01 731.29 0 0
2024-03-08 719.94 0 0
2024-03-15 675.48 0 0
2024-03-22 661.05 0 0
2024-03-29 667.31 0 0
2024-04-05 644.54 0 0
2024-04-12 648.41 0 0
2024-04-19 582.69 0 0
2024-04-26 667.12 0 0
2024-05-03 696.66 0 0
2024-05-10 692.05 0 0
2024-05-17 719.15 0 0
2024-05-24 742.13 0 0
2024-05-31 724.65 0 0
2024-06-07 740.42 0 0
2024-06-14 794.53 0 0
2024-06-21 813.84 0 0
2024-06-28 810.65 0 0
2024-07-05 830.35 0 0
2024-07-12 844.18 0 0
2024-07-19 797.97 0 0
2024-07-26 810.75 0 0
2024-08-02 785.07 0 0
2024-08-09 811.95 0 0
2024-08-16 902.38 0 0
2024-08-23 923.72 0 0
2024-08-30 922.13 0 0
2024-09-06 795.48 0 0
2024-09-13 901.83 0 0
2024-09-20 879.35 0 0
2024-09-27 912.57 0 0
2024-10-04 924.29 0 0
2024-10-11 927.12 0 0
2024-10-18 905.21 0 0
2024-10-25 890.39 0 0
2024-11-01 750.19 0 0
2024-11-08 752.09 0 0
2024-11-15 566.45 0 0
2024-11-22 573.79 0 0
2024-11-29 560.78 0 0
2024-12-06 582.55 0 0
2024-12-13 601.08 0 0
2024-12-20 586.05 0 0
2024-12-27 605.29 0 0
2025-01-03 613.67 0 0
2025-01-10 585.31 0 0
2025-01-17 619.56 0 0
2025-01-24 671.64 0 0
2025-01-31 630.99 0 0
2025-02-07 713.04 0 0
2025-02-14 678.08 0 0
2025-02-21 654.46 0 0
2025-02-28 604.90 0 0
2025-03-07 590.82 0 0
2025-03-14 600.00 0 0
2025-03-21 585.07 0 0
2025-03-28 574.09 0 0
2025-04-04 473.88 0 0
2025-04-11 529.21 0 0
2025-04-18 519.73 0 0
2025-04-25 579.43 0 0
2025-05-02 632.21 0 0
2025-05-09 633.09 0 0
2025-05-16 710.15 0 0
2025-05-23 657.32 0 0
2025-05-30 657.04 0 0
2025-06-06 682.03 0 0
2025-06-13 668.07 0 0
2025-06-20 680.86 0 0
2025-06-27 730.62 0 0
2025-07-04 754.67 0 0
2025-07-11 732.21 0 0
2025-07-18 721.45 0 0
2025-07-25 710.94 0 0
2025-08-01 781.51 0 0
2025-08-08 800.09 0 0
2025-08-15 822.15 0 0
2025-08-22 839.59 0 0
2025-08-29 831.39 0 0
2025-09-05 861.33 0 0
2025-09-12 829.78 0 0
2025-09-19 911.57 0 0
2025-09-26 882.91 0 0
2025-10-03 915.58 0 0
2025-10-10 901.24 0 0
2025-10-17 1,001.09 0 0
2025-10-24 1,071.10 0 0
2025-10-31 1,001.44 0 0
2025-11-07 954.87 0 0
2025-11-14 916.93 0 0
2025-11-21 869.26 0 0
2025-11-28 924.88 0 0
2025-12-05 959.86 0 0
2025-12-12 943.16 0 0
2025-12-19 933.79 0 0
2025-12-26 942.97 0 0
2026-01-02 934.60 0 0
2026-01-09 957.22 0 0
2026-01-16 1,031.28 0 0
2026-01-23 1,061.80 0 0
2026-01-30 1,122.10 0 0
2026-02-06 1,227.57 0 0
2026-02-13 1,169.33 0 0
2026-02-20 1,201.90 0 0
2026-02-27 1,140.65 0 0
2026-03-06 1,021.29 0 0
2026-03-13 1,050.67 0 0
2026-03-20 1,066.90 0 0
2026-03-27 1,051.09 0 0
2026-04-03 1,118.49 0 0
2026-04-10 1,353.85 0 0
2026-04-17 1,468.35 0 0
2026-04-24 1,632.06 0 0
2026-05-01 1,581.19 0 0
2026-05-08 1,598.53 0 0
2026-05-15 1,547.78 0 0
2026-05-22 1,587.51 0 0
2026-05-29 1,563.95 0 0
2026-06-05 1,478.91 0 0
2026-06-12 1,575.04 0 0
2026-06-19 1,561.44 0 0
2026-06-26 1,311.42 0 0
2026-07-03 1,288.16 0 0
2026-07-10 1,352.74 0 0
2026-07-17 1,312.00 0 18
2026-07-24 1,333.81 0 0
2026-07-31 1,426.03 0 0
2026-08-07 1,401.54 0 2
2026-08-14 1,402.01 0 1
2026-08-21 1,316.28 0 1
2026-08-28 1,254.40 0 2
2026-09-04 1,222.05 0 0
2026-09-11 1,232.63 0 0
2026-09-18 1,215.99 0 0
2026-09-25 1,365.40 0 0
2026-10-02 1,439.73 0 8
2026-10-09 1,386.29 0 0
Research playbook

What would strengthen or challenge the reading?

A set of conditions to investigate, not a claim that an insider transaction predicts the next move.

Strengthens the case

Participation broadens

Additional named insiders dispose on separate dates while price remains weak. Check transaction codes and plans before treating this as bearish conviction.

Alternative explanation

Activity is routine

Awards, option exercises, tax withholding or scheduled transactions may explain the activity. A reported acquisition alone does not establish conviction.

Challenges the case

The pattern fades

Disposals subside, acquisitions broaden or price recovers despite the selling. Reassess rather than assuming insider sales put a ceiling on price.

Participation and concentration

Who is behind the activity?

Largest participant: 52% of capped evidence weight. Multiple rows from one person do not become multiple independent voices.

Activity by named insider

TSENG, SARIA EVP & General Counsel 0 acquisitions ยท 0 disposals 50 activity balance
HSING, MICHAEL Director, CEO 0 acquisitions ยท 8 disposals 28 activity balance
SCIAMMAS, MAURICE EVP, WW Sales & Marketing 0 acquisitions ยท 19 disposals 28 activity balance
DEAN, ROBERT W II Interim CFO 0 acquisitions ยท 3 disposals 28 activity balance
CHANG, KUO WEI HERBERT Director 0 acquisitions ยท 2 disposals 28 activity balance
Distinct people, each week

How participation developed

Usable priced common-share events. Repeated records from one insider count once per side in each week.

Select a point, or focus the chart and use the arrow keys.
Acquiring insiders Disposing insiders

View chart values
Week Acquiring insiders Disposing insiders
2026-07-20 0 0
2026-07-27 0 0
2026-08-03 0 2
2026-08-10 0 1
2026-08-17 0 1
2026-08-24 0 2
2026-08-31 0 0
2026-09-07 0 0
2026-09-14 0 0
2026-09-21 0 0
2026-09-28 0 1
2026-10-05 0 0
Audit the evidence

What contributes to this reading?

32 usable events from 38 source records. Other activity remains visible in the ledger.

Security types

Common equity 38
Equity compensation 0
Options and derivatives 0
Other securities 0

Reported roles

Other or unspecified 21
CEO and chair 8
Finance leadership 5
Director 2
Other executive 2

What remains unknown

Transaction codes, filing dates and trading-plan flags are not supplied. Acquisitions are not verified discretionary purchases.

One participant supplies 52% of the capped evidence weight.

Read the methodology โ†“
Collection coverage ยท 4,983 / 5,028 companies checked successfully 9 Oct 2026 session ๏ผ‹
99.1% checked for this session

45 pending ยท 45 with a recorded check error. Latest successful check: 9 Oct 2026 13:32 BST.

Weekdays before the US open

05:30 New York collection, with an 08:00 recovery check. Unfinished companies are retried until 09:15. Provider or queue delays can leave coverage incomplete; the count above shows what actually succeeded.

These are provider checks, not filing dates. Most Form 4 transactions are reported within two business days; provider availability can add delay.

Source records

The transactions behind the reading

1โ€“30 of 123 records ยท includes awards, derivatives and unpriced activity. All stored dated history is available here; the analysis above uses 90 days.

transaction date
MPWR HSING, MICHAEL Director, CEO
Disposal Common Stock
$14.8M 10,967.00 shares Priced common-share proxy
transaction date
MPWR HSING, MICHAEL Director, CEO
Disposal Common Stock
$8.5M 6,343.00 shares Priced common-share proxy
transaction date
MPWR HSING, MICHAEL Director, CEO
Disposal Common Stock
$7.8M 5,783.00 shares Priced common-share proxy
transaction date
MPWR HSING, MICHAEL Director, CEO
Disposal Common Stock
$3.9M 2,949.00 shares Priced common-share proxy
transaction date
MPWR HSING, MICHAEL Director, CEO
Disposal Common Stock
$2.8M 2,121.00 shares Priced common-share proxy
transaction date
MPWR HSING, MICHAEL Director, CEO
Disposal Common Stock
$1.5M 1,111.00 shares Priced common-share proxy
transaction date
MPWR HSING, MICHAEL Director, CEO
Disposal Common Stock
$788.7K 596.00 shares Priced common-share proxy
transaction date
MPWR HSING, MICHAEL Director, CEO
Disposal Common Stock
$176.4K 130.00 shares Priced common-share proxy
transaction date
MPWR TSENG, SARIA EVP & General Counsel
Disposal Common Stock
Not reported 2,000.00 shares Context only
transaction date
MPWR TSENG, SARIA EVP & General Counsel
Acquisition Common Stock
Not reported 2,000.00 shares Context only
transaction date
MPWR DEAN, ROBERT W II Interim CFO
Disposal Common Stock
Not reported 5.00 shares Context only
transaction date
MPWR CHANG, KUO WEI HERBERT Director
Disposal Common Stock
$64.1K 50.00 shares Priced common-share proxy
transaction date
MPWR DEAN, ROBERT W II Interim CFO
Disposal Common Stock
$41.5K 32.00 shares Priced common-share proxy
transaction date
MPWR DEAN, ROBERT W II Interim CFO
Disposal Common Stock
$8.5K 6.00 shares Priced common-share proxy
transaction date
MPWR CHANG, KUO WEI HERBERT Director
Disposal Common Stock
$71.0K 50.00 shares Priced common-share proxy
transaction date
MPWR DEAN, ROBERT W II Interim CFO
Disposal Common Stock
$141.1K 105.00 shares Priced common-share proxy
transaction date
MPWR SCIAMMAS, MAURICE EVP, WW Sales & Marketing
Acquisition Common Stock
Not reported 25,000.00 shares Context only
transaction date
MPWR SCIAMMAS, MAURICE EVP, WW Sales & Marketing
Disposal Common Stock
Not reported 25,000.00 shares Context only
transaction date
MPWR SCIAMMAS, MAURICE EVP, WW Sales & Marketing
Disposal Common Stock
$40.3K 30.00 shares Priced common-share proxy
transaction date
MPWR DEAN, ROBERT W II Interim CFO
Acquisition Common Stock
Not reported 1,359.00 shares Context only
transaction date
MPWR SCIAMMAS, MAURICE EVP, WW Sales & Marketing
Disposal Common Stock
$7.6M 5,640.00 shares Priced common-share proxy
transaction date
MPWR SCIAMMAS, MAURICE EVP, WW Sales & Marketing
Disposal Common Stock
$2.5M 1,864.00 shares Priced common-share proxy
transaction date
MPWR SCIAMMAS, MAURICE EVP, WW Sales & Marketing
Disposal Common Stock
$2.0M 1,506.00 shares Priced common-share proxy
transaction date
MPWR SCIAMMAS, MAURICE EVP, WW Sales & Marketing
Disposal Common Stock
$2.0M 1,460.00 shares Priced common-share proxy
transaction date
MPWR SCIAMMAS, MAURICE EVP, WW Sales & Marketing
Disposal Common Stock
$1.0M 776.00 shares Priced common-share proxy
transaction date
MPWR SCIAMMAS, MAURICE EVP, WW Sales & Marketing
Disposal Common Stock
$692.5K 527.00 shares Priced common-share proxy
transaction date
MPWR SCIAMMAS, MAURICE EVP, WW Sales & Marketing
Disposal Common Stock
$649.2K 472.00 shares Priced common-share proxy
transaction date
MPWR SCIAMMAS, MAURICE EVP, WW Sales & Marketing
Disposal Common Stock
$616.8K 464.00 shares Priced common-share proxy
transaction date
MPWR SCIAMMAS, MAURICE EVP, WW Sales & Marketing
Disposal Common Stock
$576.3K 418.00 shares Priced common-share proxy
transaction date
MPWR SCIAMMAS, MAURICE EVP, WW Sales & Marketing
Disposal Common Stock
$567.5K 410.00 shares Priced common-share proxy
How to read this research

Useful signals, with the source in view

Data API โ†—

Activity is a starting point

The score measures the balance of priced common-share acquisitions and disposals. The feed does not identify transaction codes, trading plans or filing dates. A reported acquisition is not necessarily a discretionary purchase; a disposal does not prove a bearish view.

People before repeated records

Duplicate records for the same person are combined. Each participantโ€™s contribution is capped; group scores give each qualifying company equal weight. Role, transaction age and size affect the reading. Fifty is mixed or insufficient evidence.

Quality is separate from direction

Evidence quality reflects usable records, named participants and freshness. It is capped at 60/100 while transaction purpose is unverified. Neither score is a probability, a forecast or a measured trading edge.

Windows, amounts and chart interpretation

Company and group reports use the latest 90 calendar days; the dashboard also accepts date filters. Only priced common-share events with usable unit prices enter the score and its value totals. Ambiguous amount estimates, awards, derivatives and unpriced records remain visible as context. Different insiders with identical transactions remain separate.

Charts place transactions in their calendar week, not at the time a filing became public. They describe historical context and cannot establish a tradeable signal or a causal price response. Empty weeks mean no matching records in the selected window, not proof that no activity occurred. Historical returns should not be backtested from transaction dates without publication timestamps.

The 14-day cluster requires three named acquirers at one company. Repeat activity requires separate transaction dates. The 30-day change compares only companies with usable evidence in both consecutive windows.

Collection schedule and original sources

Weekday collection starts at 05:30 America/New_York, with an 08:00 recovery check. Batches resume until 09:15 and check the preceding 90 transaction days. Successful coverage is shown explicitly. A completed provider check can contain no new transactions.

Alpha Vantage insider transaction feed โ†— ยท SEC Form 4 transaction codes โ†— ยท SEC guide to insider reporting โ†—

Most Form 4 transactions must be reported within two business days. The provider can add delay. The dashboardโ€™s last check time is not a filing timestamp.

Evidence context