ATI Inc.
US ˙ NYSE ˙ US01741R1023

SecurityATI / ATI Inc.
InstitutionTrexquant Investment LP
Latest Disclosed Ownership0 shares
Latest Disclosed Value $ 0
Trexquant Investment LP closes position in ATI / ATI Inc.

On May 15, 2026 - Trexquant Investment LP filed a 13F-HR form disclosing ownership of 0 shares of ATI Inc. (US:ATI) valued at $0 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 14,551 shares of ATI Inc.. The current value of the position is $0 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F ATI COM 01741R102 0 -100.00 0
2026-02-17 2025-12-31 13F ATI COM 01741R102 14,551 14,551 1,670 0.0149
2025-11-14 2025-09-30 13F ATI COM 01741R102 0 -100.00 0
2025-08-12 2025-06-30 13F ATI COM 01741R102 114,228 -304,898 -72.75 9,862 -54.78 0.1112
2025-05-14 2025-03-31 13F ATI COM 01741R102 419,126 419,126 21,807 0.2537
2025-02-12 2024-12-31 13F ATI COM 01741R102 0 -137,472 -100.00 0 -100.00
2024-11-12 2024-09-30 13F ATI COM 01741R102 137,472 125,014 1,003.48 9,198 1,233.04 0.1164
2024-08-13 2024-06-30 13F ATI COM 01741R102 12,458 12,458 691 0.0105
2024-05-14 2024-03-31 13F ATI COM 01741R102 0 -55,638 -100.00 0 -100.00
2024-02-09 2023-12-31 13F ATI COM 01741R102 55,638 55,638 2,530 0.0569
2023-08-11 2023-06-30 13F ATI COM 01741R102 0 -35,130 -100.00 0 -100.00
2023-05-15 2023-03-31 13F ATI COM 01741R102 35,130 6,474 22.59 1,386 62.11 0.0381
2023-02-13 2022-12-31 13F ATI COM 01741R102 28,656 -3,854 -11.85 856 -1.16 0.0243
2022-11-14 2022-09-30 13F ATI COM 01741R102 32,510 -19,153 -37.07 865 -26.26 0.0304
2022-08-11 2022-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 51,663 -2,658 -4.89 1,173 -19.55 0.0526
2022-05-13 2022-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 54,321 54,321 1,458 0.0685
2021-05-13 2021-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 0 -61,060 -100.00 0 -100.00
2021-02-11 2020-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 61,060 -41,465 -40.44 1,024 14.54 0.1085
2020-11-06 2020-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 102,525 5,525 5.70 894 -9.51 0.0575
2020-08-07 2020-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 97,000 79,520 454.92 988 563.09 0.0686
2020-05-08 2020-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 17,480 17,480 149 0.0108
2019-08-09 2019-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 0 -103,717 -100.00 0 -100.00
2019-05-13 2019-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 103,717 103,717 2,652 0.1883
2018-02-08 2017-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 0 -20,286 -100.00 0 -100.00
2017-11-09 2017-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 20,286 6,186 43.87 485 102.08 0.1222
2017-08-01 2017-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 14,100 14,100 240 0.0657
2017-02-10 2016-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 0 -15,900 -100.00 0 -100.00
2016-11-10 2016-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 15,900 15,900 287 0.0641
2016-05-11 2016-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 0 0 0 0.0000
2016-02-10 2015-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 0 -41,800 -100.00 0 -100.00
2015-11-02 2015-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 41,800 30,500 269.91 592 73.61 0.0510
2015-08-12 2015-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 11,300 11,300 341 0.0383
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.