31 managers (31 13F filers) reported a position in AMPG shares at 2025-09-30, 3,456,615 shares in all. 11 filers opened a position and 4 filers sold out during the quarter.
Managers
31
13F filers
31
New
11
Added
12
Reduced
5
Sold out
4
Shares held by filers
3,456,615
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
Each filer's latest stake. The shares are the aggregate the reporting persons state, which can include entities that file no 13F.
Funicular Funds, LP 1,714,394 shares, 5.4% in a 13G as of 2026-09-21,0002073679-26-000164 Accepted , ingested
No Form 4 transaction on this security in the data.
13F holders, Q3 2025
Filers in the available 13F reports with a share position at 2025-09-30, 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.
Funicular Funds, LP and 2 other reporting persons reported 1,714,394 AMPG shares, 5.4% of the class, as of 2026-09-21, in a 13G filed 2026-10-07. 0002073679-26-000164
Accepted , ingested
Citadel Securities GP LLC and 6 other reporting persons reported 1,443,191 AMPG shares, 5.7% of the class, as of 2026-06-30, in a 13G filed 2026-10-06. 0001104659-26-114133