1,032 managers (1,063 13F filers) reported a position in MPWR shares at 2025-12-31, 48,830,047 shares in all. 131 filers opened a position and 92 filers sold out during the quarter.
Managers
1,032
13F filers
1,063
New
131
Added
384
Reduced
353
Sold out
92
Shares held by filers
48,830,047
Shares held by filers adds up every 13F filer's report, so a share reported by a parent and by its subsidiary counts twice (H9). Managers counts each filer group once.
13D and 13G filers
No 13D or 13G on this security in the data. Structured 13D/G data starts 2024-12-18.
Insider trades
No Form 4 transaction on this security in the data.
13F holders, Q4 2025
Filers in the available 13F reports with a share position at 2025-12-31, filer groups collapsed to one row (method), largest first. Options and principal amounts are left out. A group row states no % of portfolio, since each member reports its own portfolio: the members' percents are listed under it. A value about 1,000 times or 1/1,000 of the price other filers imply is shown as filed but neither ranks the row nor enters a sum.