- Quarter end
- 30 Jun 2025
- the date the book describes
- Filed
- 14 Aug 2025
- latest of these filings; the earliest 8 Aug 2025
- Managers listing it
- 8
- at least, of 95 tracked, among listed positions
- Comparable managers
- 95
- filed both Q1 2025 and Q2 2025; 6 listed it in both
- Shares listed
- 5,237,234
- combined, among listed positions
- Reported value
- $191m
- combined, at the quarter end
Among the 95 comparable managers: 5 buyers (opened or added shares) and 3 sellers (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 ATMU in Q2 2025
8 of 8 holders
| Action | Filing | |||||
|---|---|---|---|---|---|---|
| D. E. Shaw & Co. | 2,195,839 | $80m | 0.06% | Added | +118,304 | 14 Aug 2025 (the filing on sec.gov) |
| MFS Investment Management | 1,218,655 | $44m | under 0.1% | Trimmed | -2,708 | 8 Aug 2025 (the filing on sec.gov) |
| Janus Henderson Group Ltd | 794,616 | $29m | under 0.1% | Added | n.a. | 14 Aug 2025 (the filing on sec.gov) |
| Woodline Partners LP | 458,242 | $17m | 0.09% | Added | +300,875 | 14 Aug 2025 (the filing on sec.gov) |
| Two Sigma Advisers LP | 363,298 | $13m | under 0.1% | Trimmed | -117,300 | 14 Aug 2025 (the filing on sec.gov) |
| PDT Partners LLC | 117,970 | $4.3m | 0.24% | Added | +17,616 | 14 Aug 2025 (the filing on sec.gov) |
| Quantbot Technologies LP | 70,143 | $2.6m | 0.07% | Trimmed | -30,943 | 13 Aug 2025 (the filing on sec.gov) |
| Freestone Grove Partners LP | 18,471 | $673k | under 0.1% | New | new | 14 Aug 2025 (the filing on sec.gov) |
Largest increases and reductions, by shares
Increases
- Woodline Partners LPexisting position · 458,242 shares now+300,875
- D. E. Shaw & Co.existing position · 2,195,839 shares now+118,304
- Freestone Grove Partners LPnew position · 18,471 shares now+18,471
- PDT Partners LLCexisting position · 117,970 shares now+17,616
Reductions
- Two Sigma Advisers LPexisting position · 363,298 shares now-117,300
- Quantbot Technologies LPexisting position · 70,143 shares now-30,943
- MFS Investment Managementexisting position · 1,218,655 shares now-2,708
New positions and exits
New (1)
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 |
|---|---|---|---|---|
| Q2 2023 | 2 | $1.2m | n.a. | n.a. |
| Q4 2023 | 1 | $585k | 1 | 0 |
| Q1 2024 | 10 | $287m | 10 | 0 |
| Q2 2024 | 8 | $154m | 5 | 4 |
| Q3 2024 | 9 | $266m | 3 | 7 |
| Q4 2024 | 9 | $343m | 5 | 3 |
| Q1 2025 | 6 | $152m | 4 | 2 |
| Q2 2025 | 8 | $191m | 5 | 3 |
| Q3 2025 | 6 | $365m | 2 | 4 |
| Q4 2025 | 7 | $410m | 19 | 14 |
| Q1 2026 | 12 | $660m | 19 | 11 |
| Q2 2026 | 6 | $504m | 10 | 21 |
Compare with…
Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.
ATMU and AMZN →ATMU and TSLA →ATMU and HD →Choose a stock to compare with ATMU →
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 ATMU, latest filings →Back to the 13F Explorer →