ATI Inc.
MX ˙ BMV ˙ US01741R1023
SecurityMX:ATI / ATI Inc.
InstitutionMorgan Stanley
Latest Disclosed Ownership1,668,591 shares
Latest Disclosed Value $ 242,713,664
Morgan Stanley reports 30.00% increase in ownership of ATI / ATI Inc.

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 1,668,591 shares of ATI Inc. (MX:ATI) valued at $242,713,664 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 1,283,539 shares of ATI Inc.. This represents a change in shares of 30.00% 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 1,668,591 385,052 30.00 242,714 64.78 0.0146
2026-05-27 2025-12-31 13F/A-1 ATI COM 01741R102 1,283,539 -130,847 -9.25 147,299 28.03 0.0088
2026-02-13 2025-12-31 13F ATI COM 01741R102 1,283,539 -130,847 147,299 0.0088
2026-05-27 2025-09-30 13F/A-1 ATI COM 01741R102 1,414,386 207,175 17.16 115,046 10.38 0.0070
2025-11-14 2025-09-30 13F ATI COM 01741R102 1,414,386 207,175 115,046 0.0070
2025-08-15 2025-06-30 13F ATI COM 01741R102 1,207,211 104,752 9.50 104,231 81.71 0.0068
2025-05-15 2025-03-31 13F ATI COM 01741R102 1,102,459 -425,732 -27.86 57,361 -31.80 0.0041
2025-05-15 2024-12-31 13F/A-1 ATI COM 01741R102 1,528,191 -172,119 -10.12 84,112 -26.07 0.0059
2025-02-14 2024-12-31 13F ATI COM 01741R102 1,528,191 -172,119 84,112 0.0059
2025-05-14 2024-09-30 13F/A-2 ATI COM 01741R102 1,700,310 -62,709 -3.56 113,768 16.37 0.0082
2025-02-14 2024-09-30 13F/A-1 ATI COM 01741R102 1,700,310 -62,709 113,768 0.0082
2024-11-14 2024-09-30 13F ATI COM 01741R102 1,700,310 -62,709 113,768 0.0010
2025-05-14 2024-06-30 13F/A-2 ATI COM 01741R102 1,763,019 -116,992 -6.22 97,759 1.62 0.0076
2024-10-17 2024-06-30 13F/A-1 ATI COM 01741R102 1,763,019 -116,992 97,759 0.0076
2024-08-14 2024-06-30 13F ATI COM 01741R102 1,763,019 -116,992 97,759 0.0076
2024-10-17 2024-03-31 13F/A-2 ATI COM 01741R102 1,880,011 -222,721 -10.59 96,200 0.62 0.0077
2024-08-16 2024-03-31 13F/A-1 ATI COM 01741R102 1,880,011 -222,721 96,200 0.0009
2024-05-15 2024-03-31 13F ATI COM 01741R102 1,880,011 -222,721 96,200 0.0077
2024-08-16 2023-12-31 13F/A-1 ATI COM 01741R102 2,102,732 775,086 58.38 95,611 75.01 0.0084
2024-02-13 2023-12-31 13F ATI COM 01741R102 2,102,732 775,086 95,611 0.0084
2023-11-15 2023-09-30 13F ATI COM 01741R102 1,327,646 -11,608 -0.87 54,633 -7.77 0.0056
2023-08-14 2023-06-30 13F ATI COM 01741R102 1,339,254 -118,296 -8.12 59,235 2.99 0.0058
2023-05-15 2023-03-31 13F ATI COM 01741R102 1,457,550 288,252 24.65 57,515 64.73 0.0062
2023-02-14 2022-12-31 13F ATI COM 01741R102 1,169,298 -62,880 -5.10 34,915 6.49 0.0040
2022-11-14 2022-09-30 13F ATI COM 01741R102 1,232,178 -154,956 -11.17 32,788 4.08 0.0045
2022-10-27 2022-06-30 13F/A-1 ALLEGHENY TECHNOLOGIES COM 01741R102 1,387,134 302,306 27.87 31,503 8.19 0.0041
2022-08-15 2022-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 1,387,134 302,306 31,503 0.0041
2022-10-27 2022-03-31 13F/A-1 ALLEGHENY TECHNOLOGIES COM 01741R102 1,084,828 -445,346 -29.10 29,117 19.44 0.0039
2022-05-13 2022-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 1,084,828 -445,346 29,117 0.0039
2022-02-14 2021-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 1,530,174 216,752 16.50 24,377 11.61 0.0030
2021-11-15 2021-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 1,313,422 -84,282 -6.03 21,842 -25.05 0.0029
2021-08-23 2021-06-30 13F/A-1 ALLEGHENY TECHNOLOGIES COM 01741R102 1,397,704 619,380 79.58 29,141 77.78 0.0038
2021-08-16 2021-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 1,397,704 619,380 29,141 0.0008
2021-05-17 2021-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 778,324 -105,094 -11.90 16,392 10.64 0.0024
2021-02-16 2020-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 883,418 103,498 13.27 14,815 117.87 0.0023
2020-11-13 2020-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 779,920 182,882 30.63 6,800 11.77 0.0013
2020-08-14 2020-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 597,038 121,862 25.65 6,084 50.63 0.0013
2020-05-26 2020-03-31 13F/A-1 ALLEGHENY TECHNOLOGIES COM 01741R102 475,176 -752,672 -61.30 4,039 -84.08 0.0011
2020-05-15 2020-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 475,176 -752,672 4,039 310.2794
2020-02-14 2019-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 1,227,848 546,116 80.11 25,367 83.75 0.0059
2019-11-14 2019-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 681,732 79,922 13.28 13,805 -8.97 0.0037
2019-08-14 2019-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 601,810 -285,651 -32.19 15,166 -33.17 0.0040
2019-05-15 2019-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 887,461 9,274 1.06 22,693 18.70 0.0064
2019-02-14 2018-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 878,187 -770,579 -46.74 19,118 -60.76 0.0057
2019-04-23 2018-09-30 13F/A-2 ALLEGHENY TECHNOLOGIES COM 01741R102 1,648,766 455,524 38.18 48,720 62.54 0.0122
2018-11-20 2018-09-30 13F/A-1 ALLEGHENY TECHNOLOGIES COM 01741R102 1,648,766 0 48,720 0.0122
2018-11-14 2018-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 1,648,766 455,524 48,720
2019-04-23 2018-06-30 13F/A-1 ALLEGHENY TECHNOLOGIES COM 01741R102 1,193,242 -129,954 -9.82 29,974 -4.34 0.0081
2018-08-14 2018-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 1,193,242 -129,954 29,974
2019-04-23 2018-03-31 13F/A-1 ALLEGHENY TECHNOLOGIES COM 01741R102 1,323,196 71,009 5.67 31,334 3.66 0.0087
2018-05-14 2018-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 1,323,196 71,009 31,334
2019-04-23 2017-12-31 13F/A-1 ALLEGHENY TECHNOLOGIES COM 01741R102 1,252,187 27,801 2.27 30,228 3.30 0.0083
2018-02-14 2017-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 1,252,187 27,801 30,228
2017-11-14 2017-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 1,224,386 -43,809 -3.45 29,263 35.66 0.0088
2017-08-11 2017-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 1,268,195 138,727 12.28 21,571 6.33 0.0065
2017-05-22 2017-03-31 13F/A-1 ALLEGHENY TECHNOLOGIES COM 01741R102 1,129,468 -117,665 -9.43 20,286 2.11 0.0062
2017-05-12 2017-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 1,129,468 20,286
2017-02-22 2016-12-31 13F/A-1 ALLEGHENY TECHNOLOGIES COM 01741R102 1,247,133 513,485 69.99 19,866 49.85 0.0065
2017-02-13 2016-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 1,247,133 19,866
2016-11-10 2016-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 733,648 53,411 7.85 13,257 52.87 0.0045
2016-08-12 2016-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 680,237 162,800 31.46 8,672 2.82 0.0031
2016-05-12 2016-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 517,437 19,788 3.98 8,434 50.66 0.0032
2016-02-09 2015-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 497,649 42,586 9.36 5,598 -13.25 0.0020
2016-02-08 2015-09-30 13F/A-1 ALLEGHENY TECHNOLOGIES COM 01741R102 455,063 -204,357 -30.99 6,453 -67.60 0.0024
2015-11-09 2015-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 455,063 6,453
2015-08-12 2015-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 659,420 -291,640 -30.66 19,914 -30.23 0.0069
2015-05-14 2015-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 951,060 577,690 154.72 28,542 119.86 0.0105
2015-02-13 2014-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 373,370 -35,557 -8.70 12,982 -14.43 0.0047
2014-12-16 2014-09-30 13F/A-1 ALLEGHENY TECHNOLOGIES COM 01741R102 408,927 -7,983 -1.91 15,171 -19.31 0.0058
2014-11-14 2014-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 408,927 15,171
2014-08-12 2014-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 416,910 96,316 30.04 18,802 55.63 0.0322
2014-05-13 2014-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 320,594 -182,280 -36.25 12,081 -32.58 0.0051
2014-02-13 2013-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 502,874 220,735 78.24 17,918 108.08 0.0076
2013-11-13 2013-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 282,139 49,345 21.20 8,611 40.59 0.0041
2013-08-08 2013-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 232,794 232,794 6,125 0.0031
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.