229 managers (236 13F filers) reported a position in AMPH shares at 2025-12-31, 33,583,033 shares in all. 22 filers opened a position and 32 filers sold out during the quarter.
Managers
229
13F filers
236
New
22
Added
94
Reduced
87
Sold out
32
Shares held by filers
33,583,033
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.