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Holder clone rankings through .
Of the 19 tracked institutions holding MPWR, 11 have a 3-year clone track record — 8 of them beat the S&P. Average holder's clone alpha: +2.0pt. 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
2.3-2.5%
1.86M shares short · FINRA 2026-09-30
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
19
$54.39M
Total Transactions
19
the last 365 days
| Date | Insider | Code | Type | Shares | Value |
|---|---|---|---|---|---|
| Sep 28, 2026 | Michael Hsing | S | Sale | 2,949 | $3.95M |
| Sep 28, 2026 | Michael Hsing | S | Sale | 2,121 | $2.82M |
| Sep 28, 2026 | Michael Hsing | S | Sale | 596 | $788.69K |
| Sep 28, 2026 | Michael Hsing | S | Sale | 10,967 | $14.82M |
| Sep 28, 2026 | Michael Hsing | S | Sale | 5,783 | $7.77M |
| Sep 28, 2026 | Michael Hsing | S | Sale | 1,111 | $1.48M |
| Sep 28, 2026 | Michael Hsing | S | Sale | 6,343 | $8.54M |
| Sep 28, 2026 | Michael Hsing | S | Sale | 130 | $176.40K |
| Aug 24, 2026 | ROBERT W DEAN II | S | Sale | 32 | $41.53K |
| Aug 24, 2026 | KUO WEI HERBERT CHANG | S | Sale | 50 | $64.08K |
Showing 10 of 19 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.
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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
$1,140
2026-10-23
YTD
+21.8%
34% of 52-week range