Ticker · CUSIP 04956D107
Holders (tracked)
11
Combined shares
8,261,374
Combined value
$186.26M
Last close
—
Quarter
2025Q4
Tracked holders · last 8 quarters
+1 vs previous quarter over the last 8.
SEC event timeline
17 events
- Ken Griffin (Citadel Advisors) added2026-02-17+119,979 shares · 2025Q413F
- D.E. Shaw & Co. trimmed2026-02-17−324,505 shares · 2025Q413F
- Two Sigma Investments trimmed2026-02-17−91,050 shares · 2025Q413F
- Izzy Englander (Millennium Mgmt) trimmed2026-02-17−22,072 shares · 2025Q413F
- Wellington Management trimmed2026-02-17−616,375 shares · 2025Q413F
- AQR Capital Management added2026-02-17+13,065 shares · 2025Q413F
- T. Rowe Price added2026-02-17+596,553 shares · 2025Q413F
- Renaissance Technologies trimmed2026-02-12−166,700 shares · 2025Q413F
- Norges Bank (Norway SWF) opened position2026-02-10+53,214 shares · 2025Q413F
- T. Rowe Price added2025-11-14+1,973,103 shares · 2025Q313F
- Two Sigma Investments trimmed2025-11-14−23,059 shares · 2025Q313F
- Izzy Englander (Millennium Mgmt) added2025-11-14+48,312 shares · 2025Q313F
- AQR Capital Management added2025-11-14+16,246 shares · 2025Q313F
- Wellington Management trimmed2025-11-14−414,355 shares · 2025Q313F
- D.E. Shaw & Co. trimmed2025-11-14−427,365 shares · 2025Q313F
- Renaissance Technologies trimmed2025-11-13−224,800 shares · 2025Q313F
- Norges Bank (Norway SWF) trimmed2025-11-12−21,100 shares · 2024Q313F
Insider activity
No insider transactions in the last 30 days.
Who moved on this name in 2025Q4
13F transactions reported for the latest quarter, grouped by direction.
New positions1
- Norges Bank (Norway SWF)+53,214$2.8M
Added to3
- Ken Griffin (Citadel Advisors)+119,979$6.2M
- AQR Capital Management+13,065$678K
- T. Rowe Price+596,553$31K
Trimmed5
- Wellington Management−616,375$32.0M
- D.E. Shaw & Co.−324,505$16.8M
- Renaissance Technologies−166,700$8.7M
- Two Sigma Investments−91,050$4.7M
- Izzy Englander (Millennium Mgmt)−22,072$1.1M
Exited0
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Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined value |
|---|---|---|
| 2023Q2 | 9 | $86.1M |
| 2023Q3 | 10 | $55.9M |
| 2023Q4 | 8 | $42.4M |
| 2024Q1 | 11 | $382.3M |
| 2024Q2 | 13 | $342.1M |
| 2024Q3 | 12 | $218.8M |
| 2024Q4 | 10 | $140.9M |
| 2025Q1 | 10 | $243.8M |
| 2025Q2 | 9 | $208.0M |
| 2025Q3 | 10 | $208.7M |
| 2025Q4 | 11 | $186.3M |
Who owns ATMU
11 super-investors · 2025Q4
Tracked stake
8.26M
shares
Combined value
$186M
% of shares outstanding
—
shares-out unknown
Quarter action mix
New1Added5Trim5
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | Wellington Management | 1.60M | $83M |
| 2 | D.E. Shaw & Co. | 1.44M | $75M |
| 3 | Ken Griffin Citadel Advisors | 197.3K | $10M |
| 4 | Izzy Englander Millennium Mgmt | 117.8K | $6M |
| 5 | AQR Capital Management | 91.6K | $5M |
| 6 | Norges Bank Norway SWF | 53.2K | $3M |
| 7 | Renaissance Technologies | 47.4K | $2M |
| 8 | Ken Griffin Citadel Advisors | 12.1K | $628K |
| 9 | Ken Griffin Citadel Advisors | 10.5K | $545K |
| 10 | Two Sigma Investments | 7.2K | $374K |
| 11 | T. Rowe Price | 4.68M | $243K |
Recent moves
20 transactions
- TRIMD.E. Shaw & Co.−324,505 · 2025Q4
- −91,050 · 2025Q4
- +119,979 · 2025Q4
- +13,065 · 2025Q4
- +596,553 · 2025Q4
- −22,072 · 2025Q4
- −616,375 · 2025Q4
- −166,700 · 2025Q4
- +53,214 · 2025Q4
- −23,059 · 2025Q3
- +48,312 · 2025Q3
- +1,973,103 · 2025Q3
- −414,355 · 2025Q3
- TRIMD.E. Shaw & Co.−427,365 · 2025Q3
- +16,246 · 2025Q3
- −224,800 · 2025Q3
- −21,100 · 2024Q3
- −128,082 · 2025Q2
- −42,995 · 2025Q2
- +118,304 · 2025Q2
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