- Quarter end
- 31 Mar 2026
- the date the book describes
- Filed
- 27 Oct 2026
- latest of these filings; the earliest 12 May 2026
- Managers listing it
- 29
- at least, of 95 tracked, among listed positions
- Comparable managers
- 91
- filed both Q4 2025 and Q1 2026; 7 listed it in both
- Shares listed
- 23,371,734
- combined, among listed positions
- Reported value
- $1.3bn
- combined, at the quarter end
1 line marked †. Value as filed implies a price far from other filers'. Each counts in holders and value as filed, and is left out of the net change in shares.
AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.
Among the 91 comparable managers: 19 buyers (opened or added shares) and 11 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +3,289,467.
Managers listing ATMU in Q1 2026
29 of 29 holders
Largest increases and reductions, by shares
Increases
- Neuberger Berman Group LLCexisting position · 1,174,210 shares now+1,168,811
- Arrowstreet Capital LPexisting position · 999,548 shares now+659,357
- Invesco Ltdexisting position · 3,343,900 shares now+615,430
- Fidelity (FMR LLC)existing position · 4,937,777 shares now+517,992
- Jane Street Group LLCexisting position · 426,622 shares now+416,486
Reductions
- Marshall Wace LLPexisting position · 322,609 shares now-242,118
- Wellington Management Group LLPexisting position · 1,386,421 shares now-216,074
- T. Rowe Price Associates Incexisting position · 4,486,690 shares now-191,194
- Voloridge Investment Management LLCexisting position · 167,596 shares now-132,738
- Susquehanna International Group LLPexisting position · 339,083 shares now-104,911
New positions and exits
New (3)
Exited (2)
- Verition Fund Management LLCwas $3.5m
- Caxton Associates LLPwas $282k
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 →