27 managers (29 13F filers) reported a position in OSTX shares at 2026-03-31, 2,897,570 shares in all. 8 filers opened a position and 6 filers sold out during the quarter.
Managers
27
13F filers
29
New
8
Added
8
Reduced
2
Sold out
6
Shares held by filers
2,897,570
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, Q1 2026
Filers in the available 13F reports with a share position at 2026-03-31, 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.