Ticker · CUSIP 01741R102
Holders (tracked)
23
Combined shares
8,670,702
Combined value
$937.94M
Last close
$155.83
Quarter
2025Q4
Tracked holders · last 8 quarters
+7 vs previous quarter over the last 8.
Price is +44.1% vs the avg quarter-end implied price across tracked holders.
SEC event timeline
30 events
- T. Rowe Price trimmed2026-02-17−575,972 shares · 2025Q413F
- AQR Capital Management added2026-02-17+889,912 shares · 2025Q413F
- Ken Griffin (Citadel Advisors) trimmed2026-02-17−10,201 shares · 2025Q413F
- Wellington Management trimmed2026-02-17−79,942 shares · 2025Q413F
- +8,200 shares · 2025Q413F
- Two Sigma Investments opened position2026-02-17+1,967 shares · 2025Q413F
- Izzy Englander (Millennium Mgmt) added2026-02-17+169,290 shares · 2025Q413F
- Steve Cohen (Point72) added2026-02-17+450,983 shares · 2025Q413F
- D.E. Shaw & Co. trimmed2026-02-17−1,004,481 shares · 2025Q413F
- −136,458 shares · 2025Q413F
- Renaissance Technologies exited2026-02-12−259,992 shares · 2025Q413F
- Cathie Wood (ARK Invest) added2026-02-11+147 shares · 2025Q413F
- Norges Bank (Norway SWF) opened position2026-02-10+1,732,195 shares · 2025Q413F
- Ken Fisher (Fisher Asset Mgmt) trimmed2026-02-09−49,153 shares · 2025Q413F
- Mario Gabelli (GAMCO) trimmed2026-02-05−12,700 shares · 2025Q413F
- −591,342 shares · 2025Q313F
- AQR Capital Management added2025-11-14+64,986 shares · 2025Q313F
- Izzy Englander (Millennium Mgmt) added2025-11-14+48,774 shares · 2025Q313F
- Steve Cohen (Point72) trimmed2025-11-14−477,065 shares · 2025Q313F
- Two Sigma Investments exited2025-11-14−256,653 shares · 2025Q313F
- D.E. Shaw & Co. trimmed2025-11-14−486,846 shares · 2025Q313F
- T. Rowe Price trimmed2025-11-14−64,437 shares · 2025Q313F
- Wellington Management trimmed2025-11-14−10,069 shares · 2025Q313F
- George Soros (Soros Fund Mgmt) exited2025-11-14−362,695 shares · 2025Q313F
- Renaissance Technologies trimmed2025-11-13−221,700 shares · 2025Q313F
- Norges Bank (Norway SWF) exited2025-11-13−1,699,392 shares · 2025Q313F
- +136,458 shares · 2025Q313F
- Mario Gabelli (GAMCO) trimmed2025-11-12−5,000 shares · 2025Q313F
- Norges Bank (Norway SWF) added2025-11-12+227,191 shares · 2024Q313F
- Ken Fisher (Fisher Asset Mgmt) added2025-11-12+329,668 shares · 2025Q313F
Insider activity
No insider transactions in the last 30 days.
Follow-the-investor returns
If you'd copied each holder of ATI…
Cost basis inferred from 13F share-delta history. Sorted by % return on the position they're still holding.
| Investor | First in | Cost basis | Return | Position value today |
|---|---|---|---|---|
| T. Rowe Price | 2016Q1 | $0.66 | +23671.7% | $77.6M |
| Mario Gabelli (GAMCO) | 2016Q3 | $16.82 | +826.6% | $59.7M |
| Wellington Management | 2016Q1 | $35.83 | +334.9% | $58.8M |
| Ken Fisher (Fisher Asset Mgmt) | 2018Q2 | $40.16 | +288.0% | $141.6M |
| Cathie Wood (ARK Invest) | 2016Q4 | $76.16 | +104.6% | $139K |
| Paul Tudor Jones (Tudor Investment) | 2016Q1 | $86.25 | +80.7% | $1.3M |
| Two Sigma Investments | 2016Q1 | $88.31 | +76.5% | $561K |
| Two Sigma Investments | 2016Q1 | $88.31 | +76.5% | $561K |
| Two Sigma Investments | 2016Q1 | $88.31 | +76.5% | $561K |
| Ken Griffin (Citadel Advisors) | 2016Q3 | $89.17 | +74.8% | $21.0M |
| Ken Griffin (Citadel Advisors) | 2016Q3 | $89.17 | +74.8% | $21.0M |
| Ken Griffin (Citadel Advisors) | 2016Q3 | $89.17 | +74.8% | $21.0M |
| AQR Capital Management | 2016Q1 | $109.36 | +42.5% | $158.9M |
| Steve Cohen (Point72) | 2016Q2 | $113.33 | +37.5% | $3.5M |
| Steve Cohen (Point72) | 2016Q2 | $113.33 | +37.5% | $3.5M |
| Steve Cohen (Point72) | 2016Q2 | $113.33 | +37.5% | $3.5M |
| Izzy Englander (Millennium Mgmt) | 2016Q1 | $113.54 | +37.3% | $764K |
| Izzy Englander (Millennium Mgmt) | 2016Q1 | $113.54 | +37.3% | $764K |
| Izzy Englander (Millennium Mgmt) | 2016Q1 | $113.54 | +37.3% | $764K |
| D.E. Shaw & Co. | 2016Q1 | $114.67 | +35.9% | $315.2M |
| D.E. Shaw & Co. | 2016Q1 | $114.67 | +35.9% | $315.2M |
| D.E. Shaw & Co. | 2016Q1 | $114.67 | +35.9% | $315.2M |
| Norges Bank (Norway SWF) | 2016Q1 | $5615.90 | -97.2% | $269.9M |
Who moved on this name in 2025Q4
13F transactions reported for the latest quarter, grouped by direction.
New positions3
- Norges Bank (Norway SWF)+1,732,195$198.8M
- Paul Tudor Jones (Tudor Investment)+8,200$941K
- Two Sigma Investments+1,967$226K
Added to4
- AQR Capital Management+889,912$102.1M
- Steve Cohen (Point72)+450,983$51.8M
- Izzy Englander (Millennium Mgmt)+169,290$19.4M
- Cathie Wood (ARK Invest)+147$17K
Trimmed6
- D.E. Shaw & Co.−1,004,481$115.3M
- Wellington Management−79,942$9.2M
- Ken Fisher (Fisher Asset Mgmt)−49,153$5.6M
- Mario Gabelli (GAMCO)−12,700$1.5M
- Ken Griffin (Citadel Advisors)−10,201$1.2M
- T. Rowe Price−575,972$66K
Exited2
- Renaissance Technologies−259,992$21.1M
- Ray Dalio (Bridgewater Associates)−136,458$11.1M
Institutional ownership over time
Distinct super-investors holding this ticker · combined dollar value, by quarter.
| Quarter | Holders | Combined value |
|---|---|---|
| 2022Q1 | 17 | $32.70B |
| 2022Q2 | 17 | $26.41B |
| 2022Q3 | 18 | $31.1M |
| 2022Q4 | 17 | $849.9M |
| 2023Q1 | 18 | $1.11B |
| 2023Q2 | 19 | $1.20B |
| 2023Q3 | 18 | $1.02B |
| 2023Q4 | 15 | $1.16B |
| 2024Q1 | 17 | $1.28B |
| 2024Q2 | 18 | $1.38B |
| 2024Q3 | 17 | $591.9M |
| 2024Q4 | 16 | $363.2M |
| 2025Q1 | 18 | $439.1M |
| 2025Q2 | 20 | $916.2M |
| 2025Q3 | 16 | $533.9M |
| 2025Q4 | 23 | $937.9M |
Who owns ATI
23 super-investors · 2025Q4
Tracked stake
8.67M
shares
Combined value
$938M
% of shares outstanding
—
shares-out unknown
Quarter action mix
New5Added8Trim10
| # | Manager | Shares | Value |
|---|---|---|---|
| 1 | D.E. Shaw & Co. | 2.02M | $232M |
| 2 | Norges Bank Norway SWF | 1.73M | $199M |
| 3 | AQR Capital Management | 1.02M | $117M |
| 4 | Ken Fisher Fisher Asset Mgmt | 908.5K | $104M |
| 5 | Steve Cohen Point72 | 760.2K | $87M |
| 6 | Izzy Englander Millennium Mgmt | 506.9K | $58M |
| 7 | Mario Gabelli GAMCO | 383.1K | $44M |
| 8 | Wellington Management | 377.4K | $43M |
| 9 | Ken Griffin Citadel Advisors | 134.7K | $15M |
| 10 | Ken Griffin Citadel Advisors | 132.5K | $15M |
| 11 | Ken Griffin Citadel Advisors | 102.7K | $12M |
| 12 | Steve Cohen Point72 | 22.7K | $3M |
| 13 | Steve Cohen Point72 | 17.4K | $2M |
| 14 | D.E. Shaw & Co. | 12.3K | $1M |
| 15 | Izzy Englander Millennium Mgmt | 10.6K | $1M |
| 16 | Paul Tudor Jones Tudor Investment | 8.2K | $941K |
| 17 | D.E. Shaw & Co. | 5.4K | $620K |
| 18 | Izzy Englander Millennium Mgmt | 4.9K | $562K |
| 19 | Two Sigma Investments | 4.0K | $459K |
| 20 | Two Sigma Investments | 3.6K | $413K |
| 21 | Two Sigma Investments | 2.0K | $226K |
| 22 | Cathie Wood ARK Invest | 889 | $102K |
| 23 | T. Rowe Price | 498.2K | $57K |
Recent moves
20 transactions
- TRIMT. Rowe Price−575,972 · 2025Q4
- −79,942 · 2025Q4
- +1,967 · 2025Q4
- +8,200 · 2025Q4
- −10,201 · 2025Q4
- +450,983 · 2025Q4
- +889,912 · 2025Q4
- TRIMD.E. Shaw & Co.−1,004,481 · 2025Q4
- +169,290 · 2025Q4
- −136,458 · 2025Q4
- −259,992 · 2025Q4
- +147 · 2025Q4
- +1,732,195 · 2025Q4
- −49,153 · 2025Q4
- −12,700 · 2025Q4
- −591,342 · 2025Q3
- −256,653 · 2025Q3
- +48,774 · 2025Q3
- −477,065 · 2025Q3
- TRIMD.E. Shaw & Co.−486,846 · 2025Q3
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