MPWRMonolithic Power Systems, Inc.
Technology · SemiconductorsNasdaqStockMkt cap $60.3B
Disclosed trades
18
0 in 30d · 0 in 90d
Politicians
5
Last trade Jun 5, 2026
Buys
7
$80.5K at range midpoints
Sells
10
$80K at range midpoints
Closing price · 365 days
Sep 24, 2025 – Sep 23, 2026
Monthly buys vs sells · 24 months
Counts of disclosed transactions
- Buys
- Sells (incl. partial)
Politicians who traded it
| Politician | Seat | Trades | Buys | Sells | Bought (mid) | Sold (mid) | Last trade |
|---|---|---|---|---|---|---|---|
| RTommy Tuberville | Senate · AL | 8 | 2 | 6 | $16K | $48K | May 3, 2024 |
| RByron Donalds | House · FL-19 | 4 | 2 | 2 | $16K | $16K | Jun 5, 2026 |
| DRo Khanna | House · CA-17 | 3 | 1 | 1 | $32.5K | $8K | May 22, 2026 |
| RRobert P. Bresnahan, Jr. | House · PA-08 | 2 | 1 | 1 | $8K | $8K | Apr 8, 2025 |
| RMichael Guest | House · MS-03 | 1 | 1 | 0 | $8K | $0 | Oct 20, 2025 |
Recent trades
| Politician | Ticker | Asset | Type | Owner | Amount | Traded | Filed | Source |
|---|---|---|---|---|---|---|---|---|
| RTommy Tuberville | MPWR | Monolithic Power Systems, Inc. - Common Stock | Sell | Joint | $1,001 - $15,000 | May 3, 2024 | Aug 5, 2026824d | Filing |
| RByron Donalds | MPWR | Monolithic Power Systems, Inc. - Common Stock (MPWR) | Partial | Self | $1,001 - $15,000 | Jun 5, 2026 | Jul 15, 202640d | Filing |
| RByron Donalds | MPWR | Monolithic Power Systems, Inc. - Common Stock (MPWR) | Partial | Spouse | $1,001 - $15,000 | Jun 5, 2026 | Jul 15, 202640d | Filing |
| DRo Khanna | MPWR | MONOLITHIC POWER SYSTEMS, INc. | Buy | Self | $15,001 - $50,000 | May 22, 2026 | Jun 9, 202618d | FilingOCR |
| DRo Khanna | MPWR | MONOLITHIC POWER SYSTEMS INC | UnknownReview | Spouse | — | Mar 10, 2026 | Apr 7, 202628d | FilingOCR |
| RMichael Guest | MPWR | Monolithic Power Systems, Inc. - Common Stock (MPWR) | Buy | Dependent | $1,001 - $15,000 | Oct 20, 2025 | Nov 19, 202530d | Filing |
| RRobert P. Bresnahan, Jr. | MPWR | Monolithic Power Systems, Inc. - Common Stock (MPWR) | Buy | Self | $1,001 - $15,000 | Apr 8, 2025 | May 8, 202530d | Filing |
| RRobert P. Bresnahan, Jr. | MPWR | Monolithic Power Systems, Inc. - Common Stock (MPWR) | Sell | Joint | $1,001 - $15,000 | Jan 13, 2025 | Feb 13, 202531d | Filing |
| DRo Khanna | MPWR | MoNoLItHIc PoWEr SYsTEMs, Inc. | Sell | Dependent | $1,001 - $15,000 | Nov 15, 2024 | Dec 5, 202420d | FilingOCR |
| RByron Donalds | MPWR | SP Monolithic Power Systems (MPWR) | BuyReview | Spouse | $1,001 - $15,000 | Dec 7, 2022 | Nov 8, 2024702d | FilingOCR |
| RByron Donalds | MPWR | Monolithic Power Systems (MPWR) | BuyReview | Self | $1,001 - $15,000 | Dec 7, 2022 | Nov 8, 2024702d | FilingOCR |
| RTommy Tuberville | MPWR | Monolithic Power Systems, Inc. - Common Stock | Sell | Joint | $1,001 - $15,000 | May 3, 2024 | Jun 14, 202442d | Filing |
| RTommy Tuberville | MPWR | Monolithic Power Systems, Inc. - Common Stock | Buy | Joint | $1,001 - $15,000 | Oct 17, 2023 | Nov 16, 202330d | Filing |
| RTommy Tuberville | MPWR | Monolithic Power Systems, Inc. - Common Stock | Partial | Joint | $1,001 - $15,000 | Apr 3, 2023 | May 12, 202339d | Filing |
| RTommy Tuberville | MPWR | Monolithic Power Systems, Inc. - Common Stock | Partial | Joint | $1,001 - $15,000 | Apr 3, 2023 | May 12, 202339d | Filing |
| RTommy Tuberville | MPWR | Monolithic Power Systems, Inc. - Common Stock | Partial | Joint | $1,001 - $15,000 | Apr 3, 2023 | May 11, 202338d | Filing |
| RTommy Tuberville | MPWR | Monolithic Power Systems, Inc. - Common Stock | Partial | Joint | $1,001 - $15,000 | Apr 3, 2023 | May 11, 202338d | Filing |
| RTommy Tuberville | MPWR | Monolithic Power Systems, Inc. - Common Stock | Buy | Joint | $1,001 - $15,000 | Sep 30, 2021 | Oct 15, 202115d | Filing |
Insider activity Filed
Insiders
13
Semiconductors & Related Devices
Open-market buys · 90d
0
$0 bought
Open-market sells · 90d
25
$20.7M sold
Net · 90d
-$20.7M
-$708.7M net over 12 months · last Aug 31, 2026
| Date | Insider | Kind | Security | Shares | Price | Value | Post-holdings | D/I | 10b5-1 | Source |
|---|---|---|---|---|---|---|---|---|---|---|
| Aug 31, 2026filed Sep 2, 2026 | Saria TsengEVP & General Counsel | Gift | Common Stock | 2,000 | $0.00 | $0 | 2,000 | I | — | 4 |
| Aug 31, 2026filed Sep 2, 2026 | Saria TsengEVP & General Counsel | Gift | Common Stock | −2,000 | $0.00 | $0 | 142,218 | D | — | 4 |
| Aug 24, 2026filed Aug 25, 2026 | Kuo Wei Herbert Chang | Sale | Common Stock | −50 | $1,281.57 | $64,079 | 515 | D | — | 4 |
| Aug 24, 2026filed Aug 26, 2026 | Robert W Dean IIInterim CFO | Other | Common Stock | −5 | $0.00 | $0 | 7,089 | D | — | 4 |
| Aug 24, 2026filed Aug 26, 2026 | Robert W Dean IIInterim CFO | Sale | Common Stock | −32 | $1,297.72 | $41,527 | 7,094 | D | — | 4 |
| Aug 17, 2026filed Aug 19, 2026 | Robert W Dean IIInterim CFO | Sale | Common Stock | −6 | $1,413.64 | $8,482 | 7,126 | D | — | 4 |
| Aug 11, 2026filed Aug 13, 2026 | Kuo Wei Herbert Chang | Sale | Common Stock | −50 | $1,420.00 | $71,000 | 565 | D | — | 4 |
| Aug 5, 2026filed Aug 6, 2026 | Robert W Dean IIInterim CFO | Sale | Common Stock | −105 | $1,344.27 | $141,148 | 7,132 | D | — | 4 |
| Aug 4, 2026filed Aug 6, 2026 | Maurice SciammasEVP, WW Sales & Marketing | Gift | Common Stock | 25,000 | $0.00 | $0 | 36,062 | I | — | 4 |
| Aug 4, 2026filed Aug 6, 2026 | Maurice SciammasEVP, WW Sales & Marketing | Gift | Common Stock | −25,000 | $0.00 | $0 | 126,644 | D | — | 4 |
Shares, prices and post-transaction holdings are exactly as reported on SEC Form 4. Net figures count open-market buys minus open-market sales only (awards, exercises, withholding and gifts are excluded).
Unusual activity Estimated
- 50Insider overlapJun 5, 2026
Rep. Byron Donalds partially sold MPWR 10 days after its CFO sold $36K
Details
- Politician
- Byron Donalds
- Ticker
- MPWR
- Asset
- Monolithic Power Systems, Inc. - Common Stock (MPWR)
- Tx type
- partial_sale
- Tx date
- Jun 5, 2026
- Filing date
- Jul 15, 2026
- Amount low
- $1,001
- Amount high
- $15,000
- Amount mid
- $8,001
- Disclosed range
- $1,001 - $15,000
- Reporting lag days
- 40
- Is whale
- No
- Insider trade
- {"insider":{"slug":"robert-w-dean-ii","name":"Robert W Dean II","title":"Interim CFO","short_title":"CFO"},"company":"MONOLITHIC POWER SYSTEMS, INC.","ticker":"MPWR","tx_kind":"open_market_sale","tx_date":"2026-05-26","shares":22,"price":1649.56,"value":36290.32,"is_10b5_1":false}
- Days between
- 10
- Opposite side
- No
- 50Insider overlapJun 5, 2026
Rep. Byron Donalds partially sold MPWR 10 days after its CFO sold $36K
Details
- Politician
- Byron Donalds
- Ticker
- MPWR
- Asset
- Monolithic Power Systems, Inc. - Common Stock (MPWR)
- Tx type
- partial_sale
- Tx date
- Jun 5, 2026
- Filing date
- Jul 15, 2026
- Amount low
- $1,001
- Amount high
- $15,000
- Amount mid
- $8,001
- Disclosed range
- $1,001 - $15,000
- Reporting lag days
- 40
- Is whale
- No
- Insider trade
- {"insider":{"slug":"robert-w-dean-ii","name":"Robert W Dean II","title":"Interim CFO","short_title":"CFO"},"company":"MONOLITHIC POWER SYSTEMS, INC.","ticker":"MPWR","tx_kind":"open_market_sale","tx_date":"2026-05-26","shares":22,"price":1649.56,"value":36290.32,"is_10b5_1":false}
- Days between
- 10
- Opposite side
- No
- 65Insider overlapMay 22, 2026
Rep. Ro Khanna bought MPWR 4 days after its CEO sold $9.9M
Details
- Politician
- Ro Khanna
- Ticker
- MPWR
- Asset
- MONOLITHIC POWER SYSTEMS, INc.
- Tx type
- buy
- Tx date
- May 22, 2026
- Filing date
- Jun 9, 2026
- Amount low
- $15,001
- Amount high
- $50,000
- Amount mid
- $32,501
- Disclosed range
- $15,001 - $50,000
- Reporting lag days
- 18
- Is whale
- No
- Insider trade
- {"insider":{"slug":"michael-hsing","name":"Michael Hsing","title":"CEO","short_title":"CEO"},"company":"MONOLITHIC POWER SYSTEMS, INC.","ticker":"MPWR","tx_kind":"open_market_sale","tx_date":"2026-05-18","shares":6688,"price":1486.76,"value":9943450.88,"is_10b5_1":false}
- Days between
- 4
- Opposite side
- Yes
- 58Committee overlapMay 22, 2026
Select Committee on the CCP ranking member Ro Khanna bought $15,001–$50,000 of MPWR
DRo KhannaHouse Select Committee on the Strategic Competition Between the United States and the Chinese Communist PartyRanking MemberTechnologyMPWRFilingOCRDetails
- Committee
- House Select Committee on the Strategic Competition Between the United States and the Chinese Communist Party
- Title
- Ranking Member
- Leadership seat
- Yes
- Sector
- Technology
- Disclosed range
- $15,001 - $50,000
- 44Exec saleMay 18, 2026
MPWR CEO Michael Hsing sold $9.9M
Details
- Insider
- Michael Hsing
- Company
- MONOLITHIC POWER SYSTEMS, INC.
- Ticker
- MPWR
- Tx kind
- open_market_sale
- Tx date
- May 18, 2026
- Shares
- 6,688
- Price
- $1,487
- Value
- $9.9M
- Is 10b5 1
- No
- 43Exec saleMay 18, 2026
MPWR CEO Michael Hsing sold $8.5M
Details
- Insider
- Michael Hsing
- Company
- MONOLITHIC POWER SYSTEMS, INC.
- Ticker
- MPWR
- Tx kind
- open_market_sale
- Tx date
- May 18, 2026
- Shares
- 5,819
- Price
- $1,468
- Value
- $8.5M
- Is 10b5 1
- No
- 43Exec saleMay 18, 2026
MPWR CEO Michael Hsing sold $8.5M
Details
- Insider
- Michael Hsing
- Company
- MONOLITHIC POWER SYSTEMS, INC.
- Ticker
- MPWR
- Tx kind
- open_market_sale
- Tx date
- May 18, 2026
- Shares
- 5,737
- Price
- $1,483
- Value
- $8.5M
- Is 10b5 1
- No
- 43Exec saleMay 18, 2026
MPWR CEO Michael Hsing sold $7.4M
Details
- Insider
- Michael Hsing
- Company
- MONOLITHIC POWER SYSTEMS, INC.
- Ticker
- MPWR
- Tx kind
- open_market_sale
- Tx date
- May 18, 2026
- Shares
- 5,049
- Price
- $1,473
- Value
- $7.4M
- Is 10b5 1
- No
- 41Exec saleMay 18, 2026
MPWR CEO Michael Hsing sold $6M
Details
- Insider
- Michael Hsing
- Company
- MONOLITHIC POWER SYSTEMS, INC.
- Ticker
- MPWR
- Tx kind
- open_market_sale
- Tx date
- May 18, 2026
- Shares
- 4,082
- Price
- $1,477
- Value
- $6M
- Is 10b5 1
- No
- 41Exec saleMay 18, 2026
MPWR CEO Michael Hsing sold $5.7M
Details
- Insider
- Michael Hsing
- Company
- MONOLITHIC POWER SYSTEMS, INC.
- Ticker
- MPWR
- Tx kind
- open_market_sale
- Tx date
- May 18, 2026
- Shares
- 3,769
- Price
- $1,508
- Value
- $5.7M
- Is 10b5 1
- No