Latest filingSep 02, 2026Most recent Form 4
MPWR
MONOLITHIC POWER SYSTEMS, INC.
NasdaqTechnologySemiconductors & Related Devices
Insider activity for last month from 08/03 to 09/03. Counts use processed Form 4 rows. Purchase and sale metrics use codes P and S; totals remain unknown when any matching value is missing. Rows without a usable transaction date cannot be assigned to a rolling period and are excluded.
Total buying$00 buys
Total selling$5.00M2 sells
Net open-market-$5.00M2 insiders
Open-market mix
Buy vs sell distribution by transaction countInsider activity report
Monthly open-market purchase and sale counts Buys Sells
Transaction codes
By Form 4 transaction code in selected period5transactions
- G · Gifts · dominant2 · 40%
- S · Open-market sells2 · 40%
- J · Other1 · 20%
Activity by reported role
A joint filing can contribute to multiple roles7transactions
- IC · dominant3 · 43%
- EVP2 · 29%
- GC2 · 29%
Distinct insiders active
Reporting-owner CIKs by month · peak Aug 2026 (2)Aug 2026Sep 2026
Reported Holdings After
Separated by insider, security, and ownership typeDean Robert W IiCommon Stock · Direct
7,089Aug 24, 2026
Tseng SariaCommon Stock · Direct
142,218Aug 31, 2026
Tseng SariaCommon Stock · Indirect · C&T Family Trust
2,000Aug 31, 2026
These are reported post-transaction holdings, not company-wide ownership percentages. Securities, indirect vehicles, and amendments are kept separate.
Filing activity heatmap
Each cell is one day · intensity = transactions · buys green, sells redAug 03 → Sep 03
LessMore
Top insiders
By absolute net value across the selected period- DI-$8.5k
- TS+$0
Filing detail checks
Secondary metrics for the selected periodFiling-only signals
Deterministic matches in the selected period
MPWR transaction history
Filters apply within this company and selected period by default| Ticker | Insider | Role | Type | Shares | Value | Code | Signals | 90d return | Filed | Trans date |
|---|---|---|---|---|---|---|---|---|---|---|
| MPWR | Tseng Saria | EVPGC | gift | 2.00k | $0 | G | — | 0.0% | 09/02 | 08/31 |
| MPWR | Tseng Saria | EVPGC | gift | 2.00k | $0 | G | — | 0.0% | 09/02 | 08/31 |
| MPWR | DEAN ROBERT W II | IC | sale | 6 | -$848k | S | −6.5% | 08/20 | 08/17 |
MONOLITHIC POWER SYSTEMS, INC. Insider Activity FAQ
SEC Form 4 contextWho recently reported transactions at MONOLITHIC POWER SYSTEMS, INC.?
Tseng Saria, DEAN ROBERT W II.
When was the latest reported open-market purchase?
No code-P purchase is available for this period.
When was the latest reported open-market sale?
Dean Robert W Ii reported a sale on Aug 24, 2026 valued at $4.15M. Read the SEC filing.
What is the recent purchase and sale balance?
Net open-market selling in the selected period was $50,008.88. Sales can occur for many non-investment reasons.
Where can I see the original SEC filing?
Every transaction row and latest-activity fact links to its original SEC filing.
What do these Form 4 transaction codes mean?
P and S generally describe open-market or private purchases and sales. A, D, F, M, X, G, J, and V describe awards, issuer dispositions, tax withholding, exercises, gifts, other transactions, and voluntary early reports; review each filing and its footnotes for context.