- Quarter end
- 30 Sep 2025
- the date the book describes
- Filed
- 14 Nov 2025
- latest of these filings; the earliest 13 Nov 2025
- Managers listing it
- 3
- at least, of 95 tracked, among listed positions
- Comparable managers
- 95
- filed both Q2 2025 and Q3 2025; 2 listed it in both
- Shares listed
- 2,936,017
- combined, among listed positions
- Reported value
- $54m
- combined, at the quarter end
Among the 95 comparable managers: 2 buyers (opened or added shares) and 1 seller (trimmed or exited), at least, among listed positions. Their net change in shares is not known from listed positions, because at least one of them lists it in only one of the two quarters.
Managers listing OS in Q3 2025
3 of 3 holders
| Action | Filing | |||||
|---|---|---|---|---|---|---|
| Marshall Wace LLP | 2,481,917 | $46m | under 0.1% | Added | +492,815 | 13 Nov 2025 (the filing on sec.gov) |
| Soros Fund Management LLC | 322,600 | $5.9m | 0.08% | Trimmed | -303,200 | 14 Nov 2025 (the filing on sec.gov) |
| Winton Group Ltd | 131,500 | $2.4m | 0.09% | New | new | 13 Nov 2025 (the filing on sec.gov) |
Largest increases and reductions, by shares
Increases
- Marshall Wace LLPexisting position · 2,481,917 shares now+492,815
- Winton Group Ltdnew position · 131,500 shares now+131,500
Reductions
- Soros Fund Management LLCexisting position · 322,600 shares now-303,200
New positions and exits
New (1)
- Winton Group Ltd$2.4m
Exited (0)
No exit shown by a manager’s own filing.
Ownership over time
Tracked managers listing it, at least.
| Quarter | Holders | Reported value | Buyers | Sellers |
|---|---|---|---|---|
| Q3 2024 | 7 | $95m | 7 | 0 |
| Q4 2024 | 7 | $73m | 7 | 3 |
| Q1 2025 | 3 | $57m | 2 | 2 |
| Q2 2025 | 6 | $150m | 4 | 2 |
| Q3 2025 | 3 | $54m | 2 | 1 |
| Q4 2025 | 4 | $88m | 14 | 14 |
| Q1 2026 | 3 | $118m | 15 | 13 |
Compare with…
Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.
How much of the picture this is
A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.
Which funds own OS, latest filings →Back to the 13F Explorer →