Monolithic Power Systems, Inc
Held by 16 tracked managers as of Q2 2026 · CUSIP ⓘCUSIP: A 9-character ID for one specific security - one share class of one company, or one bond. Tickers can change and can mean different things in different countries; a CUSIP always identifies exactly the same security, which is why filings use it. Guide 609839105 · Sector ⓘGICS sectors: The 11-sector system most investors know (Global Industry Classification Standard): Technology, Health Care, Financials and so on. This site assigns each company a GICS-style sector from its SIC code, with a few hand corrections, so sector pages match the names investors expect. Guide
In plain English: 16 of the investors we track own this stock. In the latest quarter, 8 of them bought more of it and 6 sold some or all of theirs (3 bought it for the first time). That tells you what they did last quarter — not what the stock will do next.
Educational and informational only, not personalized investment advice. Based on public filings that may be delayed or contain errors; verify with the original filings. Disclaimer
Managers holding
16
+3 vs last quarter (like-for-like)
Total value held
$1.81B
Across tracked managers
Average weight ⓘOn average, how big this stock is in the portfolios that own it (its share of each manager's reported portfolio value).
0.1%
Of each manager's book
QoQ value ⓘLike-for-like: only managers that filed both quarters are compared, so a manager filing late (or confidentially) does not look like buying or selling. Includes price changes.
+$615.04M
+384.7% vs last quarter
Net shares bought
+414.4K
Est. net flow +$572.80M
Quarter activity
8 bought · 6 sold
3 new · 0 sold out
Tracked capital in this stock
Total value held (area) and number of managers (line). Dips can mean a large holder filed that quarter confidentially (e.g. Norges Bank in Q1/Q3).
Aggregate buying and selling
Net share change reported each quarter
Who owns MPWR?
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Who owns MPWR? — Q2 2026
Holders ranked by position size, with each one's quarter-over-quarter change.
Column filters
| # | Manager | Fund | Shares | Value ↓ | % of their portfolio | QoQ | Δ shares | Δ shares % | Est. Δ value ⓘChange in shares × this quarter's price |
|---|---|---|---|---|---|---|---|---|---|
| 6 | Ron Baron | Baron Capital (BAMCO) | 58.60K | $81.01M | 0.1% | Reduced | -4.4K | -7.0% | -$6.07M |
| 7 | Parnassus Investments | Parnassus Investments LLC | 17.57K | $24.28M | 0.1% | Reduced | -606 | -3.3% | -$837.71K |
| 10 | Ray Dalio | Bridgewater Associates | 3.10K | $4.28M | 0.0% | Reduced | -8.8K | -74.1% | -$12.23M |
| 13 | Wasatch Advisors | Wasatch Advisors LP | 1.24K | $1.71M | 0.0% | Reduced | -1.7K | -58.0% | -$2.36M |
| 14 | Jeremy Grantham | GMO | 1.07K | $1.48M | 0.0% | Reduced | -447 | -29.4% | -$617.75K |
| 15 | Ken Fisher | Fisher Asset Management | 177 | $245.52K | 0.0% | Reduced | -35 | -16.5% | -$48.55K |
Column filters
No tracked manager sold out of this stock this quarter.
Politician trades
Column filters
| Politician | Date | Ticker | Asset | Type | Reported range ⓘThe dollar range the politician reported. Exact amounts are not disclosed. | Est. size ⓘOur estimate only: the midpoint of the reported range. | Owner | Account ⓘSubholding Of: the account the trade was in, as named on the report (e.g. an IRA or a brokerage account). The same stock bought on the same day in different accounts is a separate trade in each account. | Filed ↓ | Filing delay ⓘDays between the trade and the report. Over 45 days is late under the STOCK Act. | Source |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Ro Khanna Politician | Jul 27, 2026 | MPWR | MONOLITHIC POWER SYSTEMS INC CMN x scanned | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Child | — | Aug 7, 2026 | 11 days | PTR ↗ |
| Byron Donalds Politician | Jun 5, 2026 | MPWR | Monolithic Power Systems, Inc. - Common Stock (MPWR) [ST] | Sale (partial) | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Spouse | Moran Wealth IRA | Jul 15, 2026 | 40 days | PTR ↗ |
| Byron Donalds Politician | Jun 5, 2026 | MPWR | Monolithic Power Systems, Inc. - Common Stock (MPWR) [ST] | Sale (partial) | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Self | Moran Wealth IRA | Jul 15, 2026 | 40 days | PTR ↗ |
| Ro Khanna Politician | Jun 18, 2026 | MPWR | MONOLITHIC POWER SYSTEMS, INC, CMN scanned | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | — | — | Jul 6, 2026 | 18 days | PTR ↗ |
| Ro Khanna Politician | May 22, 2026 | MPWR | MONOLITHIC POWER SYSTEMS, INC. CMN : : scanned | Purchase | $15,001 - $50,000 | Est. $32,500 (midpoint of reported range $15,001–$50,000) | — | — | Jun 9, 2026 | 18 days | PTR ↗ |
| Ro Khanna Politician | Jan 23, 2026 | MPWR | MONOLITHIC POWER SYSTEMS, INC. CMN scanned | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | — | — | Feb 6, 2026 | 14 days | PTR ↗ |
| Ro Khanna Politician | Jan 29, 2026 | MPWR | MONOLITHIC POWER SYSTEMS, INC. CN scanned | Sale (partial) | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Spouse | — | Feb 6, 2026 | 8 days | PTR ↗ |
| Michael Guest Politician | Oct 20, 2025 | MPWR | Monolithic Power Systems, Inc. - Common Stock (MPWR) [ST] | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Child | TR - D1 | Nov 19, 2025 | 30 days | PTR ↗ |
| Ro Khanna Politician | Apr 23, 2025 | MPWR | MONOLITHIC POWER SYSTEMS, INC. CMN scanned | Sale | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Spouse | — | May 12, 2025 | 19 days | PTR ↗ |
| Robert P. Bresnahan, Jr. Politician | Apr 8, 2025 | MPWR | Monolithic Power Systems, Inc. - Common Stock (MPWR) [ST] | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Self | JP Morgan Brokerage Account | May 8, 2025 | 30 days | PTR ↗ |
| Ro Khanna Politician | Mar 12, 2025 | MPWR | MONOLITHIC POWER SYSTEMS, INC. CMN scanned | Sale (partial) | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | — | — | Apr 10, 2025 | 29 days | PTR ↗ |
| Ro Khanna Politician | Feb 25, 2025 | MPWR | MONOLITHIC POWER SYSTEMS, INC. CMN scanned | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | — | — | Mar 6, 2025 | 9 days | PTR ↗ |
| Robert P. Bresnahan, Jr. Politician | Jan 13, 2025 | MPWR | Monolithic Power Systems, Inc. - Common Stock (MPWR) [ST] | Sale | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Joint | Joint Ownership LPL Account | Feb 13, 2025 | 31 days | PTR ↗ |
| Ro Khanna Politician | Jan 17, 2025 | MPWR | MONOLITHIC POWER SYSTEMS, INC. CMN scanned | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Spouse | — | Feb 6, 2025 | 20 days | PTR ↗ |
| Ro Khanna Politician | Dec 16, 2024 | MPWR | MONOLITHIC POWER SYSTEMS, INC. CMN scanned | Sale | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Spouse | — | Jan 8, 2025 | 23 days | PTR ↗ |
| Ro Khanna Politician | Nov 15, 2024 | MPWR | MONOLITHIC POWER SYSTEMS, INC. CuN scanned | Sale | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | — | — | Dec 5, 2024 | 20 days | PTR ↗ |
| Byron Donalds Politician | Dec 7, 2022 | MPWR | Monolithic Power Systems (MPWR) scanned | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | — | — | Nov 8, 2024 | 702 days Late | PTR ↗ |
| Byron Donalds Politician | Dec 7, 2022 | MPWR | Monolithic Power Systems (MPWR! scanned | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | — | — | Nov 8, 2024 | 702 days Late | PTR ↗ |
| Ro Khanna Politician | May 29, 2024 | MPWR | MONOLITHIC POWER SYSTEMS, INC. CMN scanned | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Child | — | Jun 5, 2024 | 7 days | PTR ↗ |
| Ro Khanna Politician | Mar 25, 2024 | MPWR | MONOLITHIC POWER SYSTEMS, INC. CMN scanned | Sale (partial) | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | — | — | Apr 5, 2024 | 11 days | PTR ↗ |
| Ro Khanna Politician | Mar 20, 2024 | MPWR | MONOLITHIC POWER SYSTEMS, INC. CMN scanned | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | Spouse | — | Apr 5, 2024 | 16 days | PTR ↗ |
| Ro Khanna Politician | Feb 13, 2024 | MPWR | MONOUTHIC POWER SYSTEMS, INC scanned | Purchase | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | — | — | Mar 6, 2024 | 22 days | PTR ↗ |
| Ro Khanna Politician | Jan 10, 2024 | MPWR | MONOLITHIC POWER SYSTEMS, INC. CMN scanned | Sale | $1,001 - $15,000 | Est. $8,000 (midpoint of reported range $1,001–$15,000) | — | — | Feb 5, 2024 | 26 days | PTR ↗ |