ATI Inc.
MX ˙ BMV ˙ US01741R1023
SecurityMX:ATI / ATI Inc.
InstitutionVanguard Group Inc
Latest Disclosed Ownership0 shares
Ownership 0.00%
Vanguard Group Inc ownership in ATI / ATI Inc.

2026-03-26 - Vanguard Group Inc has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 0 shares of ATI Inc. (MX:ATI). This represents 0.0 percent ownership of the company. In their previous filing dated 2025-04-30 , Vanguard Group Inc had reported owning 13,895,719 shares, indicating a decrease of -100.00 percent.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File
Date		Effective
Date		Form Prev
Shares		 Latest
Shares		 ΔShares
(Percent)		 Ownership
(Percent)		 ΔOwnership
(Percent)
2026-03-26 2026-03-26 13G/A 13,895,719 0 -100.00 0.00 -100.00
2025-04-30 2025-04-30 13G/A 14,200,240 13,895,719 -2.14 9.85 -11.50
2024-02-13 2024-02-13 13G/A 14,470,396 14,200,240 -1.87 11.13 -0.45
2023-02-09 2023-02-09 13G/A 13,815,653 14,470,396 4.74 11.18 2.95
2022-02-09 2022-02-09 13G/A 12,908,138 13,815,653 7.03 10.86 6.68
2021-02-10 2021-02-10 13G/A 12,486,387 12,908,138 3.38 10.18 2.83
2020-02-10 2020-02-10 13G/A 11,551,533 12,486,387 8.09 9.90 7.73
2019-02-11 2019-02-11 13G/A 10,902,267 11,551,533 5.96 9.19 6.12
2018-02-12 2018-02-12 13G/A 8,617,797 10,902,267 26.51 8.66 9.48
2017-02-09 2017-02-09 13G/A 7,191,843 8,617,797 19.83 7.91 20.21
2016-02-10 2016-02-10 13G/A 7,191,843 6.58
2015-02-11 2015-02-11 13G/A 8,118,555 7.46
2014-02-10 2014-02-10 13G/A 7,150,177 6.62
2013-02-22 2013-02-22 13G/A 6,109,619 5.69
2013-02-11 2013-02-11 13G/A 6,109,619 5.37
2012-02-07 2012-02-07 13G 5,439,611 5.11

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

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)
2026-01-29 2025-12-31 13F ATI COM 01741R102 12,726,524 -327,723 -2.51 1,460,496 37.54 0.0212
2025-11-07 2025-09-30 13F ATI COM 01741R102 13,054,247 -276,228 -2.07 1,061,832 -7.74 0.0159
2025-08-11 2025-06-30 13F ATI COM 01741R102 13,330,475 -566,067 -4.07 1,150,953 59.18 0.0186
2025-05-09 2025-03-31 13F ATI COM 01741R102 13,896,542 -1,438,867 -9.38 723,037 -14.34 0.0131
2025-02-11 2024-12-31 13F ATI COM 01741R102 15,335,409 2,020,313 15.17 844,061 -5.26 0.0147
2024-11-13 2024-09-30 13F ATI COM 01741R102 13,315,096 87,761 0.66 890,913 21.47 0.0160
2024-08-13 2024-06-30 13F ATI COM 01741R102 13,227,335 -1,111,538 -7.75 733,456 -0.04 0.0141
2024-05-10 2024-03-31 13F ATI COM 01741R102 14,338,873 132,478 0.93 733,720 13.59 0.0145
2024-03-11 2023-12-31 13F/A-1 ATI COM 01741R102 14,206,395 -107,366 -0.75 645,965 9.67 0.0141
2024-02-14 2023-12-31 13F ATI COM 01741R102 14,206,395 -107,366 645,965 0.0123
2023-12-18 2023-09-30 13F/A-1 ATI COM 01741R102 14,313,761 -64,536 -0.45 589,011 -7.38 0.0145
2023-11-14 2023-09-30 13F ATI COM 01741R102 14,313,761 -64,536 589,011 0.0026
2023-08-14 2023-06-30 13F ATI COM 01741R102 14,378,297 -185,180 -1.27 635,952 10.66 0.0151
2023-07-14 2023-03-31 13F/A-1 ATI COM 01741R102 14,563,477 93,081 0.64 574,675 33.00 0.0146
2023-05-15 2023-03-31 13F ATI COM 01741R102 14,563,477 93,081 574,675 0.0146
2023-02-10 2022-12-31 13F ATI COM 01741R102 14,470,396 115,995 0.81 432,086 13.12 0.0118
2022-11-14 2022-09-30 13F ATI COM 01741R102 14,354,401 527,117 3.81 381,970 21.64 0.0112
2022-08-12 2022-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 13,827,284 -255,803 -1.82 314,017 -16.92 0.0088
2022-05-13 2022-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 14,083,087 267,434 1.94 377,991 71.75 0.0089
2022-02-14 2021-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 13,815,653 -9,208 -0.07 220,083 -4.27 0.0050
2021-11-12 2021-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 13,824,861 101,618 0.74 229,907 -19.65 0.0057
2021-08-13 2021-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 13,723,243 347,962 2.60 286,129 1.58 0.0071
2021-05-14 2021-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 13,375,281 467,143 3.62 281,683 30.13 0.0076
2021-02-12 2020-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 12,908,138 280,731 2.22 216,470 96.59 0.0063
2020-11-16 2020-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 12,627,407 754,014 6.35 110,112 -8.99 0.0036
2020-08-14 2020-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 11,873,393 -886,221 -6.95 120,990 11.56 0.0043
2020-05-15 2020-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 12,759,614 273,227 2.19 108,457 -57.96 0.0046
2020-02-14 2019-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 12,486,387 329,177 2.71 257,968 4.79 0.0088
2019-11-14 2019-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 12,157,210 12,103 0.10 246,184 -19.56 0.0091
2019-08-14 2019-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 12,145,107 373,842 3.18 306,056 1.68 0.0115
2019-05-15 2019-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 11,771,265 219,732 1.90 300,991 19.69 0.0118
2019-02-14 2018-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 11,551,533 205,037 1.81 251,477 -25.00 0.0113
2018-12-13 2018-09-30 13F/A-2 ALLEGHENY TECHNOLOGIES COM 01741R102 11,346,496 187,817 1.68 335,290 19.62 0.0131
2018-11-23 2018-09-30 13F/A-1 ALLEGHENY TECHNOLOGIES COM 01741R102 11,346,496 0 335,290 0.0131
2018-11-14 2018-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 11,346,496 187,817 335,290
2018-08-14 2018-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 11,158,679 195,237 1.78 280,306 7.97 0.0117
2018-05-15 2018-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 10,963,442 61,175 0.56 259,614 -1.35 0.0114
2018-02-14 2017-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 10,902,267 1,644,461 17.76 263,180 18.94 0.0115
2017-11-14 2017-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 9,257,806 120,312 1.32 221,262 42.35 0.0103
2017-08-24 2017-06-30 13F/A-1 ALLEGHENY TECHNOLOGIES COM 01741R102 9,137,494 55,412 0.61 155,430 -4.71 0.0077
2017-08-11 2017-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 9,137,494 55,412 155,430
2017-05-12 2017-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 9,082,082 464,285 5.39 163,114 18.82 0.0084
2017-02-14 2016-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 8,617,797 311,596 3.75 137,282 -8.54 0.0077
2016-11-14 2016-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 8,306,201 303,543 3.79 150,093 47.10 0.0088
2016-08-10 2016-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 8,002,658 472,609 6.28 102,034 -16.87 0.0063
2016-05-13 2016-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 7,530,049 338,206 4.70 122,740 51.70 0.0080
2016-02-08 2015-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 7,191,843 7,112,798 8,998.42 80,909 7,117.57 0.0054
2015-11-12 2015-09-30 13F/A-1 ALLEGHENY TECHNOLOGIES COM 01741R102 79,045 -8,528,819 -99.08 1,121 -99.57 0.0000
2015-11-12 2015-09-30 13F/A-1 ALLEGHENY TECHNOLOGIES COM 01741R102 14,244,465 5,636,601 201,985 0.0086
2015-11-12 2015-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 16,464,939 471,284
2015-08-13 2015-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 8,607,864 225,931 2.70 259,958 3.35 0.0176
2015-05-15 2015-03-31 13F/A-1 ALLEGHENY TECHNOLOGIES COM 01741R102 8,381,933 263,378 3.24 251,541 -10.89 0.0171
2015-05-14 2015-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 8,381,933 251,541
2015-02-12 2014-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 8,118,555 501,004 6.58 282,281 -0.12 0.0203
2014-11-12 2014-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 7,617,551 149,519 2.00 282,611 -16.09 0.0220
2014-08-11 2014-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 7,468,032 151,144 2.07 336,808 22.16 0.0265
2014-05-13 2014-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 7,316,888 166,711 2.33 275,701 8.22 0.0232
2014-02-12 2013-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 7,150,177 -12,897 -0.18 254,762 16.53 0.0224
2013-11-07 2013-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 7,163,074 406,371 6.01 218,617 22.98 0.0214
2013-08-13 2013-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 6,756,703 6,756,703 177,768 0.0187
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.