ATI Inc.
MX ˙ BMV ˙ US01741R1023
SecurityMX:ATI / ATI Inc.
InstitutionAmeriprise Financial Inc
Latest Disclosed Ownership998,834 shares
Latest Disclosed Value $ 145,290,393
Ameriprise Financial Inc reports 19.72% decrease in ownership of ATI / ATI Inc.

On May 15, 2026 - Ameriprise Financial Inc filed a 13F-HR form disclosing ownership of 998,834 shares of ATI Inc. (MX:ATI) valued at $145,290,393 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 1,244,248 shares of ATI Inc.. This represents a change in shares of -19.72% during the quarter.

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 998,834 -245,414 -19.72 145,290 1.75 0.0062
2026-02-17 2025-12-31 13F ATI COM 01741R102 1,244,248 -70,675 -5.37 142,790 33.50 0.0323
2025-11-14 2025-09-30 13F ATI COM 01741R102 1,314,923 -794,996 -37.68 106,956 -41.29 0.0246
2025-08-14 2025-06-30 13F ATI COM 01741R102 2,109,919 -807,737 -27.68 182,170 20.00 0.0449
2025-05-14 2025-03-31 13F ATI COM 01741R102 2,917,656 -237,821 -7.54 151,806 -12.59 0.0410
2025-02-14 2024-12-31 13F ATI COM 01741R102 3,155,477 12,528 0.40 173,677 -17.41 0.0446
2024-11-14 2024-09-30 13F ATI COM 01741R102 3,142,949 -505,961 -13.87 210,295 3.94 0.0539
2024-08-14 2024-06-30 13F ATI COM 01741R102 3,648,910 401,210 12.35 202,332 21.75 0.0547
2024-05-15 2024-03-31 13F ATI COM 01741R102 3,247,700 69,685 2.19 166,185 15.00 0.0457
2024-02-14 2023-12-31 13F ATI COM 01741R102 3,178,015 141,280 4.65 144,504 15.64 0.0433
2023-11-14 2023-09-30 13F ATI COM 01741R102 3,036,735 -22,055 -0.72 124,962 -7.63 0.0410
2023-08-14 2023-06-30 13F ATI COM 01741R102 3,058,790 -142,164 -4.44 135,290 7.11 0.0424
2023-05-22 2023-03-31 13F/A-1 ATI COM 01741R102 3,200,954 -149,606 -4.47 126,310 26.25 0.0414
2023-05-15 2023-03-31 13F ATI COM 01741R102 3,200,954 -149,606 126,310 0.0076
2023-02-14 2022-12-31 13F ATI COM 01741R102 3,350,560 206,959 6.58 100,046 19.60 0.0343
2022-11-14 2022-09-30 13F ATI COM 01741R102 3,143,601 -211,602 -6.31 83,651 9.78 0.0309
2022-08-15 2022-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 3,355,203 -226,874 -6.33 76,199 -20.74 0.0266
2022-05-16 2022-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 3,582,077 595,603 19.94 96,143 102.08 0.0284
2022-02-14 2021-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 2,986,474 6,812 0.23 47,576 -3.99 0.0132
2021-11-15 2021-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 2,979,662 -35,075 -1.16 49,554 -21.16 0.0158
2021-08-16 2021-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 3,014,737 2,428,295 414.07 62,857 408.92 0.0194
2021-05-17 2021-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 586,442 24,423 4.35 12,351 31.05 0.0041
2021-02-12 2020-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 562,019 -33,090 -5.56 9,425 81.63 0.0033
2020-11-16 2020-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 595,109 255,874 75.43 5,189 50.10 0.0021
2020-08-14 2020-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 339,235 7,198 2.17 3,457 22.50 0.0015
2020-05-15 2020-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 332,037 -537,697 -61.82 2,822 -84.29 0.0015
2020-02-14 2019-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 869,734 -579,303 -39.98 17,967 -38.77 0.0075
2019-11-14 2019-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 1,449,037 -141,227 -8.88 29,342 -26.78 0.0131
2019-08-14 2019-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 1,590,264 -253,988 -13.77 40,074 -15.02 0.0179
2019-05-15 2019-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 1,844,252 -142,410 -7.17 47,158 9.00 0.0217
2019-02-14 2018-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 1,986,662 63,039 3.28 43,266 -23.89 0.0216
2018-11-14 2018-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 1,923,623 17,946 0.94 56,843 18.75 0.0199
2018-08-14 2018-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 1,905,677 165,556 9.51 47,869 16.17 0.0212
2018-05-14 2018-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 1,740,121 -1,779 -0.10 41,206 -1.93 0.0186
2018-02-12 2017-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 1,741,900 433,858 33.17 42,019 34.40 0.0192
2017-11-07 2017-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 1,308,042 622,591 90.83 31,264 168.02 0.0149
2017-08-10 2017-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 685,451 -239,320 -25.88 11,665 -29.77 0.0058
2017-05-05 2017-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 924,771 57,127 6.58 16,610 20.17 0.0086
2017-02-03 2016-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 867,644 85,724 10.96 13,822 -2.18 0.0075
2016-11-08 2016-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 781,920 140,106 21.83 14,130 72.65 0.0079
2016-08-08 2016-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 641,814 153,093 31.33 8,184 2.74 0.0048
2016-05-12 2016-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 488,721 203,042 71.07 7,966 147.85 0.0048
2016-02-11 2015-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 285,679 -5,207 -1.79 3,214 -22.08 0.0019
2015-11-12 2015-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 290,886 164,115 129.46 4,125 7.73 0.0026
2015-08-13 2015-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 126,771 4,243 3.46 3,829 4.13 0.0022
2015-05-14 2015-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 122,528 -2,933 -2.34 3,677 -15.74 0.0021
2015-02-13 2014-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 125,461 26,051 26.21 4,364 18.36 0.0025
2014-11-14 2014-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 99,410 58,912 145.47 3,687 102.03 0.0022
2014-08-13 2014-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 40,498 1,787 4.62 1,825 25.09 0.0011
2014-05-14 2014-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 38,711 -271 -0.70 1,459 4.96 0.0009
2014-02-14 2013-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 38,982 964 2.54 1,390 19.72 0.0008
2013-11-14 2013-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 38,018 -1,482 -3.75 1,161 11.85 0.0008
2013-08-14 2013-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 39,500 39,500 1,038 0.0007
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.