MPWRMonolithic Power Systems, Inc.
Technology · SemiconductorsNasdaqStockMkt cap $60.3B
Disclosed trades
32
0 in 30d · 0 in 90d
Politicians
6
Last trade Jul 27, 2026
Buys
16
$152.5K at range midpoints
Sells
15
$144.5K at range midpoints
Closing price · 365 days
Nov 6, 2025 – Nov 5, 2026
Monthly buys vs sells · 24 months
Counts of disclosed transactions
- Buys
- Sells (incl. partial)
Politicians who traded it
5 hold it now Estimated
| Politician | Seat | Trades | Buys | Sells | Bought (mid) | Sold (mid) | Last trade | Est. position Estimated |
|---|---|---|---|---|---|---|---|---|
| DRo Khanna | House · CA-17 | 19 | 10 | 8 | $104.5K | $88.5K | Jul 27, 2026 | $43.4K |
| RTommy Tuberville | Senate · AL | 8 | 2 | 6 | $16K | $48K | May 3, 2024 | $6.2K |
| RByron Donalds | House · FL-19 | 4 | 2 | 2 | $16K | $16K | Jun 5, 2026 | $37K |
| RRobert P. Bresnahan, Jr. | House · PA-08 | 2 | 1 | 1 | $8K | $8K | Apr 8, 2025 | $19.9K |
| DDonna E. Shalala | House · FL-27 | 1 | 0 | 1 | $0 | $8K | Jun 24, 2019 | — |
| RMichael Guest | House · MS-03 | 1 | 1 | 0 | $8K | $0 | Oct 20, 2025 | $8.8K |
Recent trades
| Politician | Ticker | Asset | Type | Owner | Amount | vs S&P Estimated | Traded | Filed | Source |
|---|---|---|---|---|---|---|---|---|---|
| DRo Khanna | MPWR | MONOLITHIC POWER SYSTEMS INC CMN | Buy | Dependent | $1,001 - $15,000 | -14.1% | Jul 27, 2026 | Aug 7, 202611d | FilingOCR |
| RTommy Tuberville | MPWR | Monolithic Power Systems, Inc. - Common Stock | SellRestated | Joint | $1,001 - $15,000 | +11.1% | May 3, 2024 | Aug 5, 2026824d | Filing |
| RByron Donalds | MPWR | Monolithic Power Systems, Inc. - Common Stock (MPWR) | Partial | Self | $1,001 - $15,000 | +13.5% | Jun 5, 2026 | Jul 15, 202640d | Filing |
| RByron Donalds | MPWR | Monolithic Power Systems, Inc. - Common Stock (MPWR) | Partial | Spouse | $1,001 - $15,000 | +13.5% | Jun 5, 2026 | Jul 15, 202640d | Filing |
| DRo Khanna | MPWR | MONOLITHIC POWER SYSTEMS, INC. CMN | Buy | Dependent | $1,001 - $15,000 | -13.5% | Jun 18, 2026 | Jul 6, 202618d | FilingOCR |
| DRo Khanna | MPWR | MONOLITHIC POWER SYSTEMS, INc. | Buy | Self | $15,001 - $50,000 | -25.6% | May 22, 2026 | Jun 9, 202618d | FilingOCR |
| DRo Khanna | MPWR | MONOLITHIC POWER SYSTEMS INC CMN | Sell | Spouse | $1,001 - $15,000 | +16.2% | Mar 10, 2026 | Apr 7, 202628d | FilingOCR |
| DRo Khanna | MPWR | MONOLITHICPOWERSYSTEMS,INC CMN | Buy | Spouse | $1,001 - $15,000 | -1.5% | Feb 5, 2026 | Mar 9, 202632d | FilingOCR |
| DRo Khanna | MPWR | MONOLITHICPOWERSYSTEMS,INC. CMN | Buy | Dependent | $1,001 - $15,000 | -14.1% | Jan 23, 2026 | Feb 6, 202614d | FilingOCR |
| RMichael Guest | MPWR | Monolithic Power Systems, Inc. - Common Stock (MPWR) | Buy | Dependent | $1,001 - $15,000 | +17.3% | Oct 20, 2025 | Nov 19, 202530d | Filing |
| DRo Khanna | MPWR | MONOLITHIc POwER SYStEMs, INc. CMN | Sell | Spouse | $1,001 - $15,000 | -33.8% | Apr 23, 2025 | May 12, 202519d | FilingOCR |
| RRobert P. Bresnahan, Jr. | MPWR | Monolithic Power Systems, Inc. - Common Stock (MPWR) | Buy | Self | $1,001 - $15,000 | +47.1% | Apr 8, 2025 | May 8, 202530d | Filing |
| DRo Khanna | MPWR | MonoLithIc power systeMs, Inc. CMN | Sell | Dependent | $1,001 - $15,000 | -93.7% | Mar 12, 2025 | Apr 10, 202529d | FilingOCR |
| DRo Khanna | MPWR | MONOLITHIC POWER SYSTEMS, INC. CMN | Buy | Dependent | $1,001 - $15,000 | +72.0% | Feb 25, 2025 | Mar 6, 20259d | FilingOCR |
| RRobert P. Bresnahan, Jr. | MPWR | Monolithic Power Systems, Inc. - Common Stock (MPWR) | Sell | Joint | $1,001 - $15,000 | -41.4% | Jan 13, 2025 | Feb 13, 202531d | Filing |
| DRo Khanna | MPWR | MONOLITHIC POWER SYSTEMS, INC. CMN | Buy | Spouse | $1,001 - $15,000 | +50.3% | Jan 17, 2025 | Feb 6, 202520d | FilingOCR |
| DRo Khanna | MPWR | MONOLITHIC POWER SYSTEMS, INC. CMN | Sell | Spouse | $1,001 - $15,000 | -57.9% | Dec 16, 2024 | Jan 8, 202523d | FilingOCR |
| DRo Khanna | MPWR | MoNoLItHIc PoWEr SYsTEMs, Inc. | Sell | Dependent | $1,001 - $15,000 | -76.9% | Nov 15, 2024 | Dec 5, 202420d | FilingOCR |
| RByron Donalds | MPWR | Monolithic Power Systems (MPWR) | BuyReview | Spouse | $1,001 - $15,000 | +26.1% | Dec 7, 2022 | Nov 8, 2024702d | FilingOCR |
| RByron Donalds | MPWR | Monolithic Power Systems (MPWR) | BuyReview | Self | $1,001 - $15,000 | +26.1% | Dec 7, 2022 | Nov 8, 2024702d | FilingOCR |
| RTommy Tuberville | MPWR | Monolithic Power Systems, Inc. - Common Stock | Sell | Joint | $1,001 - $15,000 | -5.2% | May 3, 2024 | Jun 14, 202442d | Filing |
| DRo Khanna | MPWR | MONOLITHIC POWER SYSTEMS, INC. CMN | Buy | Dependent | $1,001 - $15,000 | +12.2% | May 29, 2024 | Jun 5, 20247d | FilingOCR |
| DRo Khanna | MPWR | MONOLITHIC POWER SYSTEMS, INC. CMN | Sell | Dependent | $1,001 - $15,000 | -31.5% | Mar 25, 2024 | Apr 5, 202411d | FilingOCR |
| RTommy Tuberville | MPWR | Monolithic Power Systems, Inc. - Common Stock | Buy | Joint | $1,001 - $15,000 | +47.9% | Oct 17, 2023 | Nov 16, 202330d | Filing |
| DRo Khanna | MPWR | MONOLITHIC POWER SYSTEMS, IN. CMN | Sell | Dependent | $15,001 - $50,000 | -61.9% | Oct 26, 2023 | Nov 8, 202313d | FilingOCR |
| RTommy Tuberville | MPWR | Monolithic Power Systems, Inc. - Common Stock | PartialRestated | Joint | $1,001 - $15,000 | -105.3% | Apr 3, 2023 | May 12, 202339d | Filing |
| RTommy Tuberville | MPWR | Monolithic Power Systems, Inc. - Common Stock | PartialRestated | Joint | $1,001 - $15,000 | -105.3% | Apr 3, 2023 | May 12, 202339d | Filing |
| RTommy Tuberville | MPWR | Monolithic Power Systems, Inc. - Common Stock | Partial | Joint | $1,001 - $15,000 | -106.0% | Apr 3, 2023 | May 11, 202338d | Filing |
| RTommy Tuberville | MPWR | Monolithic Power Systems, Inc. - Common Stock | Partial | Joint | $1,001 - $15,000 | -106.0% | Apr 3, 2023 | May 11, 202338d | Filing |
| DRo Khanna | MPWR | MONOLITHICPOWERSYSTEMS,INC.CMN | Buy | Spouse | $1,001 - $15,000 | +65.4% | Jan 9, 2023 | Feb 7, 202329d | FilingOCR |
| DRo Khanna | MPWR | MONOLI'THIC POWER SYSTEMS, INC. CMN | Sell | Spouse | $1,001 - $15,000 | -124.8% | Nov 3, 2022 | Dec 6, 202233d | FilingOCR |
| DRo Khanna | MPWR | MONOLITHIC POWEr SYSTEMS, INC, CMN | Buy | Dependent | $1,001 - $15,000 | +124.8% | Nov 2, 2022 | Dec 6, 202234d | FilingOCR |
| DRo Khanna | MPWR | MONOLITHIC POWER SYSTEMS, INC, CMN | UnknownReview | Unknown | $1,001 - $15,000 | — | Sep 6, 2022 | Oct 7, 202231d | FilingOCR |
| RTommy Tuberville | MPWR | Monolithic Power Systems, Inc. - Common Stock | Buy | Joint | $1,001 - $15,000 | +70.8% | Sep 30, 2021 | Oct 15, 202115d | Filing |
| DDonna E. Shalala | MPWR | Monolithic Power Systems, Inc. (MPWR) | Sell | Self | $1,001 - $15,000 | — | Jun 24, 2019 | Apr 27, 2020308d | Filing |
Insider activity Filed
Insiders
13
Semiconductors & Related Devices
Open-market buys · 90d
0
$0 bought
Open-market sells · 90d
12
$40.5M sold
Net · 90d
-$40.5M
-$724.5M net over 12 months · last Nov 3, 2026
| Date | Insider | Kind | Security | Shares | Price | Value | Post-holdings | D/I | 10b5-1 | Source |
|---|---|---|---|---|---|---|---|---|---|---|
| Nov 3, 2026filed Nov 5, 2026 | Maurice SciammasEVP, WW Sales & Marketing | Gift | Common Stock | 13,000 | $0.00 | $0 | 49,062 | I | — | 4 |
| Nov 3, 2026filed Nov 5, 2026 | Maurice SciammasEVP, WW Sales & Marketing | Gift | Common Stock | −13,000 | $0.00 | $0 | 113,652 | D | — | 4 |
| Sep 28, 2026filed Sep 30, 2026 | Michael HsingCEO | Sale | Common Stock | −130 | $1,356.94 | $176,402 | 818,264 | D | 10b5-1 | 4 |
| Sep 28, 2026filed Sep 30, 2026 | Michael HsingCEO | Sale | Common Stock | −10,967 | $1,351.43 | $14,821,133 | 818,394 | D | 10b5-1 | 4 |
| Sep 28, 2026filed Sep 30, 2026 | Michael HsingCEO | Sale | Common Stock | −6,343 | $1,347.15 | $8,544,972 | 829,361 | D | 10b5-1 | 4 |
| Sep 28, 2026filed Sep 30, 2026 | Michael HsingCEO | Sale | Common Stock | −5,783 | $1,343.76 | $7,770,964 | 835,704 | D | 10b5-1 | 4 |
| Sep 28, 2026filed Sep 30, 2026 | Michael HsingCEO | Sale | Common Stock | −2,949 | $1,338.66 | $3,947,708 | 841,487 | D | 10b5-1 | 4 |
| Sep 28, 2026filed Sep 30, 2026 | Michael HsingCEO | Sale | Common Stock | −1,111 | $1,333.34 | $1,481,341 | 844,436 | D | 10b5-1 | 4 |
| Sep 28, 2026filed Sep 30, 2026 | Michael HsingCEO | Sale | Common Stock | −2,121 | $1,328.54 | $2,817,833 | 845,547 | D | 10b5-1 | 4 |
| Sep 28, 2026filed Sep 30, 2026 | Michael HsingCEO | Sale | Common Stock | −596 | $1,323.31 | $788,693 | 847,668 | D | 10b5-1 | 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
- 32Exec salePublic Sep 30, 2026 · traded Sep 28, 2026
MPWR CEO Michael Hsing sold $14.8M (10b5-1 plan)
Details
- Insider
- Michael Hsing
- Company
- MONOLITHIC POWER SYSTEMS, INC.
- Ticker
- MPWR
- Tx kind
- open_market_sale
- Traded
- Sep 28, 2026
- Shares
- 10,967
- Price
- $1,351
- Value
- $14.8M
- Is 10b5 1
- Yes
- Filed
- Sep 30, 2026
- Public from
- Sep 30, 2026
- Method version
- 2026-11-03
- 28Exec salePublic Sep 30, 2026 · traded Sep 28, 2026
MPWR CEO Michael Hsing sold $8.5M (10b5-1 plan)
Details
- Insider
- Michael Hsing
- Company
- MONOLITHIC POWER SYSTEMS, INC.
- Ticker
- MPWR
- Tx kind
- open_market_sale
- Traded
- Sep 28, 2026
- Shares
- 6,343
- Price
- $1,347
- Value
- $8.5M
- Is 10b5 1
- Yes
- Filed
- Sep 30, 2026
- Public from
- Sep 30, 2026
- Method version
- 2026-11-03
- 28Exec salePublic Sep 30, 2026 · traded Sep 28, 2026
MPWR CEO Michael Hsing sold $7.8M (10b5-1 plan)
Details
- Insider
- Michael Hsing
- Company
- MONOLITHIC POWER SYSTEMS, INC.
- Ticker
- MPWR
- Tx kind
- open_market_sale
- Traded
- Sep 28, 2026
- Shares
- 5,783
- Price
- $1,344
- Value
- $7.8M
- Is 10b5 1
- Yes
- Filed
- Sep 30, 2026
- Public from
- Sep 30, 2026
- Method version
- 2026-11-03
- 65Insider overlapPublic Aug 7, 2026 · traded Jul 27, 2026
Rep. Ro Khanna's dependent child bought MPWR 9 days before its CFO sold $141K
Details
- Politician
- Ro Khanna
- Ticker
- MPWR
- Asset
- MONOLITHIC POWER SYSTEMS INC CMN
- Tx type
- buy
- Traded
- Jul 27, 2026
- Filed
- Aug 7, 2026
- Amount low
- $1,001
- Amount high
- $15,000
- Range midpoint (estimate)
- $8,001
- Disclosed range
- $1,001 - $15,000
- Reporting lag days
- 11
- Owner type
- dependent
- 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":"2026-08-05","shares":105,"price":1344.27,"value":141148.35,"is_10b5_1":false,"filing_date":"2026-08-06"}
- Days between
- -9
- Opposite side
- Yes
- Public from
- Aug 7, 2026
- Method version
- 2026-11-03
- 50Insider overlapPublic Jul 15, 2026 · traded Jun 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
- Traded
- Jun 5, 2026
- Filed
- Jul 15, 2026
- Amount low
- $1,001
- Amount high
- $15,000
- Range midpoint (estimate)
- $8,001
- Disclosed range
- $1,001 - $15,000
- Reporting lag days
- 40
- Owner type
- self
- 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,"filing_date":"2026-05-28"}
- Days between
- 10
- Opposite side
- No
- Public from
- Jul 15, 2026
- Method version
- 2026-11-03
- 50Insider overlapPublic Jul 15, 2026 · traded Jun 5, 2026
Rep. Byron Donalds's spouse 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
- Traded
- Jun 5, 2026
- Filed
- Jul 15, 2026
- Amount low
- $1,001
- Amount high
- $15,000
- Range midpoint (estimate)
- $8,001
- Disclosed range
- $1,001 - $15,000
- Reporting lag days
- 40
- Owner type
- spouse
- 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,"filing_date":"2026-05-28"}
- Days between
- 10
- Opposite side
- No
- Public from
- Jul 15, 2026
- Method version
- 2026-11-03
- 65Insider overlapPublic Jul 6, 2026 · traded Jun 18, 2026
Rep. Ro Khanna's dependent child bought MPWR 23 days after its CFO sold $36K
Details
- Politician
- Ro Khanna
- Ticker
- MPWR
- Asset
- MONOLITHIC POWER SYSTEMS, INC. CMN
- Tx type
- buy
- Traded
- Jun 18, 2026
- Filed
- Jul 6, 2026
- Amount low
- $1,001
- Amount high
- $15,000
- Range midpoint (estimate)
- $8,001
- Disclosed range
- $1,001 - $15,000
- Reporting lag days
- 18
- Owner type
- dependent
- 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,"filing_date":"2026-05-28"}
- Days between
- 23
- Opposite side
- Yes
- Public from
- Jul 6, 2026
- Method version
- 2026-11-03
- 65Insider overlapPublic Jun 9, 2026 · traded May 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
- Traded
- May 22, 2026
- Filed
- Jun 9, 2026
- Amount low
- $15,001
- Amount high
- $50,000
- Range midpoint (estimate)
- $32,501
- Disclosed range
- $15,001 - $50,000
- Reporting lag days
- 18
- Owner type
- self
- 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,"filing_date":"2026-05-20"}
- Days between
- 4
- Opposite side
- Yes
- Public from
- Jun 9, 2026
- Method version
- 2026-11-03
- 58Committee overlapPublic Jun 9, 2026 · traded May 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
- Traded
- May 22, 2026
- Filed
- Jun 9, 2026
- Public from
- Jun 9, 2026
- Method version
- 2026-11-03
- 44Exec salePublic May 20, 2026 · traded May 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
- Traded
- May 18, 2026
- Shares
- 6,688
- Price
- $1,487
- Value
- $9.9M
- Is 10b5 1
- No
- Filed
- May 20, 2026
- Public from
- May 20, 2026
- Method version
- 2026-11-03