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Of the 19 tracked institutions holding MPWR, 13 have a 3-year clone track record — 10 of them beat the S&P. Average holder's clone alpha: +3.0pt. It's a gauge of who owns the name, not just how many.
Among the 19 tracked institutional investors we monitor, MPWR (MONOLITHIC PWR SYS INC) is held with a combined value of $25.65B across 20,633,377 shares. The largest holder is BlackRock, Inc. with a position worth $7.73B (0.12% of their portfolio). 5 funds opened new positions in the most recent quarter. 6 funds increased their holdings. 8 funds reduced their position.
Total Institutional Value
$25.65B
Total Shares Held
20,633,377
Institutional Holders
19
% of Shares Outstanding
42.0%
of 49.14M shares · SEC 2026-07-29
Days to Cover
2.7-13.3%
1.84M shares short · FINRA 2026-08-14
Tracked 13F institutions hold 42.0% of MPWR's shares outstanding. This is a floor: 13F filings arrive on a ~45-day lag and we track only a subset of institutional filers, so true institutional ownership is higher. Shares-outstanding is the latest SEC cover-page figure (as of 2026-07-29), not a live float.
Ranked by estimated dollars moved (share change × implied price). 13F data lags up to 45 days.
0
$0
11
$14.04M
Total Transactions
11
Last 12 months
| Date | Insider | Code | Type | Shares | Value |
|---|---|---|---|---|---|
| Aug 24, 2026 | ROBERT W DEAN II | S | Sale | 32 | $41.53K |
| Aug 24, 2026 | KUO WEI HERBERT CHANG | S | Sale | 50 | $64.08K |
| Aug 17, 2026 | ROBERT W DEAN II | S | Sale | 6 | $8.48K |
| Aug 11, 2026 | KUO WEI HERBERT CHANG | S | Sale | 50 | $71.00K |
| Aug 5, 2026 | ROBERT W DEAN II | S | Sale | 105 | $141.15K |
| Aug 3, 2026 | Maurice Sciammas | S | Sale | 30 | $40.32K |
| Jul 15, 2026 | Maurice Sciammas | S | Sale | 527 | $692.49K |
| Jul 1, 2026 | Maurice Sciammas | S | Sale | 30 | $40.55K |
| Jun 1, 2026 | Maurice Sciammas | S | Sale | 30 | $46.02K |
| May 27, 2026 | Saria Tseng | S | Sale | 7,565 | $12.86M |
Showing 10 of 11 transactions
| # | Fund | Value↓ | Portfolio % | Change |
|---|---|---|---|---|
| 1 | BlackRock, Inc. | $7.73B | 0.12% | -7.9% |
| 2 | FMR LLC | $7.16B | 0.31% | +17.6% |
| 3 | VANGUARD GROUP INC | $5.47B | 0.08% | -0.7% |
| 4 | STATE STREET CORP | $3.16B | 0.09% | +4.3% |
| 5 | PRICE T ROWE ASSOCIATES INC /MD/ | $1.35B | 0.14% | -22.7% |
| 6 | MILLENNIUM MANAGEMENT LLC | $189.16M | 0.13% | +960.7% |
| 7 | ADAGE CAPITAL PARTNERS GP, L.L.C. | $133.19M | 0.19% | +30.8% |
| 8 | D1 Capital Partners L.P. | $117.64M | 0.34% | New |
| 9 | WELLINGTON MANAGEMENT GROUP LLP | $99.53M | 0.02% | -71.3% |
| 10 | CITADEL ADVISORS LLC | $87.76M | 0.05% | +369.9% |
| Member | Type | Date |
|---|---|---|
| Byron Donalds | Sell | Jun 5, 2026 |
| Markwayne Mullin | Buy | Feb 4, 2026 |
| Markwayne Mullin | Buy | Jan 5, 2026 |
| Michael Patrick Guest | Buy |
As of the latest SEC 13F filings, BlackRock, Inc. is the largest institutional holder of MPWR with a position worth $7.73B, representing 0.12% of their portfolio. In total, 19 institutional investors hold MPWR with a combined value of $25.65B.
In the most recent quarter, 5 funds opened a new position in MPWR. Additionally, 6 increased their holdings and 8 reduced their positions.
Institutional investors hold $25.65B worth of MPWR stock across 19 positions. The largest institutional holder is BlackRock, Inc. with $7.73B in holdings.
A 13F filing is a quarterly report required by the SEC from institutional investment managers with over $100 million in assets. It discloses their holdings in U.S. equities. For MPWR, these filings reveal which major funds are accumulating or reducing positions, providing insights into institutional sentiment.
Get notified when hedge funds change their MPWR positions.
Alpha = the manager's 3-year clone return minus the S&P 500. A skilled roster is a stronger tell than a crowded one — though even skilled managers' edge doesn't reliably survive the 13F disclosure lag. Why →
| Oct 20, 2025 |
| Rob Bresnahan | Buy | Apr 8, 2025 |
| Rob Bresnahan | Sell | Jan 13, 2025 |
| Thomas H Tuberville | Sell | May 3, 2024 |
Last Close
$1,204
2026-09-09
YTD
+28.6%
44% of 52-week range
