Ticker · CUSIP 00217Y104
Holders (tracked)
5
Combined shares
3,898,309
Combined value
$107.18M
Last close
$32.72
Quarter
2025Q4
Price · 1Y$32.72+8.31 (+34.04%)H $32.83 · L $23.53 · Avg Vol 131K
Position opened
Tracked holders · last 8 quarters
Flat over the last 8 quarters.
Price is +19.0% vs the avg quarter-end implied price across tracked holders.
SEC event timeline
8 events
- Ken Griffin (Citadel Advisors) added2026-02-17+79,020 shares · 2025Q4Position
- D.E. Shaw & Co. trimmed2026-02-17−109,800 shares · 2025Q4Position
- Izzy Englander (Millennium Mgmt) added2026-02-17+32,058 shares · 2025Q4Position
- Norges Bank (Norway SWF) opened position2026-02-10+1,079,090 shares · 2025Q4Position
- +43,821 shares · 2025Q3Position
- D.E. Shaw & Co. added2025-11-14+159,328 shares · 2025Q3Position
- Norges Bank (Norway SWF) exited2025-11-13−1,027,456 shares · 2025Q3Position
- Norges Bank (Norway SWF) added2025-11-12+69,635 shares · 2024Q3Position
Insider activity
No insider transactions in the last 30 days.
Follow-the-investor returns
If you'd copied each holder of ATS…
Cost basis inferred from each manager's quarter-over-quarter position changes. Sorted by % return on the position they're still holding.
| Investor | First in | Cost basis | Return | Position value today |
|---|---|---|---|---|
| D.E. Shaw & Co. | 2023Q2 | $26.31 | +24.4% | $3.5M |
| Ken Griffin (Citadel Advisors) | 2023Q2 | $27.48 | +19.1% | $4.9M |
| Prem Watsa (Fairfax Financial) | 2023Q2 | $29.97 | +9.2% | $81.4M |
| Izzy Englander (Millennium Mgmt) | 2023Q2 | $31.82 | +2.8% | $2.5M |
| Norges Bank (Norway SWF) | 2023Q2 | $43.64 | -25.0% | $35.3M |
Who moved on this name in 2025Q4
Position changes reported for the latest quarter, grouped by direction.
New positions1
- Norges Bank (Norway SWF)+1,079,090$29.7M
Added to2
- Ken Griffin (Citadel Advisors)+79,020$2.2M
- Izzy Englander (Millennium Mgmt)+32,058$883K
Trimmed1
- D.E. Shaw & Co.−109,800$3.0M
Exited0
—
Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined value |
|---|---|---|
| 2023Q2 | 7 | $81.7M |
| 2023Q3 | 5 | $53.1M |
| 2023Q4 | 6 | $53.5M |
| 2024Q1 | 8 | $45.0M |
| 2024Q2 | 10 | $41.4M |
| 2024Q3 | 10 | $45.3M |
| 2024Q4 | 8 | $112.5M |
| 2025Q1 | 6 | $65.7M |
| 2025Q2 | 5 | $115.1M |
| 2025Q3 | 5 | $73.2M |
| 2025Q4 | 5 | $107.2M |
Who owns ATS
5 super-investors · 2025Q4
Tracked stake
3.90M
shares
Combined value
$107M
% of shares outstanding
—
shares-out unknown
Quarter action mix
New1Added2Trim1Held1
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | Prem Watsa Fairfax Financial | 2.49M | $68M |
| 2 | Norges Bank Norway SWF | 1.08M | $30M |
| 3 | Ken Griffin Citadel Advisors | 148.8K | $4M |
| 4 | D.E. Shaw & Co. | 108.1K | $3M |
| 5 | Izzy Englander Millennium Mgmt | 75.9K | $2M |
Recent moves
20 transactions
- TRIMD.E. Shaw & Co.−109,800 · 2025Q4
- +32,058 · 2025Q4
- +79,020 · 2025Q4
- +1,079,090 · 2025Q4
- +159,328 · 2025Q3
- +43,821 · 2025Q3
- −1,027,456 · 2025Q3
- +69,635 · 2024Q3
- +27,672 · 2025Q2
- +1,027,456 · 2025Q2
- TRIMD.E. Shaw & Co.−1,400 · 2025Q1
- +13,905 · 2024Q1
- −1,027,456 · 2025Q1
- −41,905 · 2024Q4
- −35,633 · 2024Q4
- +2,429,700 · 2024Q4
- TRIMD.E. Shaw & Co.−38,289 · 2024Q4
- −42,300 · 2024Q3
- SOLDD.E. Shaw & Co.−170,900 · 2023Q4
- −59,678 · 2024Q3
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