Monolithic Power Sys (MPWR): Congress and insider trades
Who in Congress and inside the company traded MPWR, when each filing appeared, and what buying after each one would have earned against the S&P 500.
Key Facts
- Monolithic Power Sys (MPWR) is a listed stock on NASDAQ.
- 5 members of Congress filed 16 buys and 13 sells of MPWR, the latest published 2026-08-12 (12 August 2026).
- Insiders filed 0 open market buys worth $0 and 24 sells worth $171M, the latest filed 2026-08-26 (26 August 2026).
- Across 13 scored buys, Congress averaged +9.4% against the S&P 500 (SPY) over the 90 days after disclosure, with 69% of them ahead of the index. That result is not distinguishable from luck.
- Data as of 2026-09-29 (29 September 2026).
Congress trades in MPWR
as of 2026-08-12| Filed | Member | Type | Size | Days to file | 90 day vs S&P |
|---|---|---|---|---|---|
| 12 Aug 2026 | Ro Khanna (D-CA) | buy | 1K–15K | 11 | n/a |
| 5 Aug 2026 | Tommy Tuberville (R-AL) | sell | 1K–15K | 824 | n/a |
| 16 Jul 2026 | Byron Donalds (R-FL) | sell | 1K–15K | 40 | n/a |
| 16 Jul 2026 | Byron Donalds (R-FL) | sell | 1K–15K | 40 | n/a |
| 8 Jul 2026 | Ro Khanna (D-CA) | buy | 1K–15K | 18 | n/a |
| 11 Jun 2026 | Ro Khanna (D-CA) | buy | 15K–50K | 18 | -27.1% |
| 9 Apr 2026 | Ro Khanna (D-CA) | sell | 1K–15K | 28 | n/a |
| 12 Mar 2026 | Ro Khanna (D-CA) | buy | 1K–15K | 32 | +39.6% |
| 2 Mar 2026 | Markwayne Mullin (R-OK) | buy | 15K–50K | 26 | +32.0% |
| 4 Feb 2026 | Markwayne Mullin (R-OK) | buy | 15K–50K | 30 | +34.6% |
| 4 Feb 2026 | Markwayne Mullin (R-OK) | buy | 15K–50K | 30 | +34.6% |
| 15 May 2025 | Ro Khanna (D-CA) | sell | 1K–15K | 19 | n/a |
| 9 May 2025 | Rob Bresnahan (R-PA) | buy | 1K–15K | 30 | +4.0% |
| 16 Nov 2023 | Tommy Tuberville (R-AL) | buy | 1K–15K | 30 | +24.4% |
| 10 Nov 2023 | Ro Khanna (D-CA) | sell | 15K–50K | 13 | n/a |
| 12 Jul 2023 | Ro Khanna (D-CA) | sell | 1K–15K | 26 | n/a |
| 12 May 2023 | Tommy Tuberville (R-AL) | sell | 1K–15K | 39 | n/a |
| 9 Feb 2023 | Ro Khanna (D-CA) | buy | 1K–15K | 29 | -20.2% |
| 7 Dec 2022 | Ro Khanna (D-CA) | sell | 1K–15K | 33 | n/a |
| 7 Dec 2022 | Ro Khanna (D-CA) | buy | 1K–15K | 34 | +30.1% |
| 17 Nov 2022 | Ro Khanna (D-CA) | sell | 1K–15K | 21 | n/a |
| 12 Oct 2022 | Ro Khanna (D-CA) | sell | 1K–15K | 8 | n/a |
| 12 Oct 2022 | Ro Khanna (D-CA) | buy | 1K–15K | 31 | +11.4% |
| 11 Jul 2022 | Ro Khanna (D-CA) | sell | 1K–15K | 20 | n/a |
| 15 Jun 2022 | Ro Khanna (D-CA) | buy | 1K–15K | 31 | +3.1% |
| 12 May 2022 | Ro Khanna (D-CA) | buy | 1K–15K | 25 | +15.2% |
| 9 Feb 2022 | Ro Khanna (D-CA) | sell | 1K–15K | 28 | n/a |
| 16 Oct 2021 | Tommy Tuberville (R-AL) | buy | 1K–15K | 15 | -14.8% |
| 16 Sep 2021 | Ro Khanna (D-CA) | buy | 1K–15K | 22 | -10.0% |
Nothing matches that search.
Insider trades in MPWR
as of 2026-08-26| Filed | Insider | Type | Shares | Price | Value | 90 day vs S&P |
|---|---|---|---|---|---|---|
| 26 Aug 2026 | DEAN ROBERT W II | sell | 32 | $1297.72 | $41.5K | n/a |
| 25 Aug 2026 | CHANG KUO WEI HERBERT | sell | 50 | $1281.57 | $64.1K | n/a |
| 19 Aug 2026 | DEAN ROBERT W II | sell | 6 | $1413.64 | $8.5K | n/a |
| 13 Aug 2026 | CHANG KUO WEI HERBERT | sell | 50 | $1420.00 | $71.0K | n/a |
| 6 Aug 2026 | DEAN ROBERT W II | sell | 105 | $1344.27 | $141K | n/a |
| 5 Aug 2026 | Sciammas Maurice | sell | 30 | $1343.94 | $40.3K | n/a |
| 17 Jul 2026 | Sciammas Maurice | sell | 15,000 | $1349.73 | $20M | n/a |
| 6 Jul 2026 | Sciammas Maurice | sell | 30 | $1351.61 | $40.5K | n/a |
| 3 Jun 2026 | Sciammas Maurice | sell | 30 | $1533.95 | $46.0K | n/a |
| 29 May 2026 | Tseng Saria | sell | 7,565 | $1700.00 | $13M | n/a |
| 28 May 2026 | DEAN ROBERT W II | sell | 22 | $1649.56 | $36.3K | n/a |
| 27 May 2026 | Tseng Saria | sell | 5,000 | $1586.43 | $7.9M | n/a |
| 27 May 2026 | Zhou Jeff | sell | 486 | $1680.00 | $816K | n/a |
| 20 May 2026 | Hsing Michael | sell | 40,000 | $1482.75 | $59M | n/a |
| 20 May 2026 | DEAN ROBERT W II | sell | 4 | $1563.28 | $6.3K | n/a |
| 19 May 2026 | Sciammas Maurice | sell | 12,000 | $1561.40 | $19M | n/a |
| 6 May 2026 | Zhou Jeff | sell | 500 | $1650.00 | $825K | n/a |
| 6 May 2026 | Zhou Jeff | sell | 1,014 | $1587.06 | $1.6M | n/a |
| 10 Apr 2026 | Tseng Saria | sell | 8,963 | $1305.22 | $12M | n/a |
| 8 Apr 2026 | Tseng Saria | sell | 7,636 | $1167.95 | $8.9M | n/a |
| 3 Apr 2026 | Sciammas Maurice | sell | 30 | $1116.44 | $33.5K | n/a |
| 3 Apr 2026 | Tseng Saria | sell | 1,400 | $1133.52 | $1.6M | n/a |
| 1 Apr 2026 | Tseng Saria | sell | 25,674 | $1010.50 | $26M | n/a |
| 24 Mar 2026 | Sciammas Maurice | sell | 30 | $1095.07 | $32.9K | n/a |
Nothing matches that search.
Related pages
Frequently asked questions
Who has bought MPWR?
16 Congress buys by 5 members and 0 insider buys are on file. The tables on this page list every one.
Did buying MPWR after a disclosure beat the market?
Across 13 scored buys, Congress averaged +9.4% against the S&P 500 (SPY) over the 90 days after disclosure, with 69% of them ahead of the index. That result is not distinguishable from luck. A single stock is a small sample.
Sources: Congressional trades: STOCK Act disclosures, collected from CapitolTrades. Insider trades: SEC Form 4 filings, collected from Finviz. Prices: Yahoo Finance daily adjusted closes. Data as of 2026-09-29 (29 September 2026). About these sources.
Not investment advice. Past disclosed trades do not predict future returns. Disclosures are published late, so the trades shown are ones you could only have copied after the fact. Talk to a licensed adviser before you invest.