ATI Inc.
US ˙ NYSE ˙ US01741R1023

SecurityATI / ATI Inc.
InstitutionAsset Management One Co., Ltd.
Latest Disclosed Ownership42,215 shares
Latest Disclosed Value $ 6,086,133
Asset Management One Co., Ltd. reports 0.44% decrease in ownership of ATI / ATI Inc.

On May 8, 2026 - Asset Management One Co., Ltd. filed a 13F-HR form disclosing ownership of 42,215 shares of ATI Inc. (US:ATI) valued at $6,140,594 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 27, 2026 disclosing 42,400 shares of ATI Inc.. This represents a change in shares of -0.44% during the quarter. The current value of the position is $7,645,136 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)
2026-05-08 2026-03-31 13F ATI COM 01741R102 42,215 -185 -0.44 6,086 23.15 0.0179
2026-01-27 2025-12-31 13F ATI COM 01741R102 42,400 -2,784 -6.16 4,943 34.92 0.0137
2025-10-22 2025-09-30 13F ATI COM 01741R102 45,184 45,184 3,664 0.0106
2020-08-14 2020-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 0 -126,904 -100.00 0 -100.00
2020-05-14 2020-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 126,904 -37,913 -23.00 1,079 -68.31 0.0063
2020-02-14 2019-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 164,817 0 0.00 3,405 2.01 0.0153
2019-11-14 2019-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 164,817 26,936 19.54 3,338 -3.94 0.0161
2019-08-14 2019-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 137,881 32,876 31.31 3,475 29.42 0.0171
2019-05-15 2019-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 105,005 18,170 20.92 2,685 38.69 0.0145
2019-02-13 2018-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 86,835 2,821 3.36 1,936 -22.53 0.0046
2018-11-14 2018-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 84,014 84,014 2,499 0.0051
2017-05-02 2016-12-31 13F/A-1 ALLEGHENY TECHNOLOGIES Com 01741R102 0 -18,700 -100.00 0 -100.00
2016-11-07 2016-09-30 13F ALLEGHENY TECHNOLOGIES Com 01741R102 18,700 -5,300 -22.08 338 10.46 0.0050
2016-08-03 2016-06-30 13F ALLEGHENY TECHNOLOGIES Com 01741R102 24,000 8,400 53.85 306 20.47 0.0046
2016-05-05 2016-03-31 13F ALLEGHENY TECHNOLOGIES Com 01741R102 15,600 -5,400 -25.71 254 7.63 0.0037
2016-01-28 2015-12-31 13F ALLEGHENY TECHNOLOGIES Com 01741R102 21,000 -947 -4.31 236 -23.87 0.0035
2015-11-12 2015-09-30 13F ALLEGHENY TECHNOLOGIES Com 01741R102 21,947 12,700 137.34 310 8.39 0.0047
2015-08-06 2015-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 9,247 0 0.00 286 0.35 0.0040
2015-05-11 2015-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 9,247 0 0.00 285 -12.31 0.0035
2015-02-09 2014-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 9,247 -2,384 -20.50 325 -26.80 0.0042
2014-11-05 2014-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 11,631 0 0.00 444 -14.29 0.0061
2014-08-12 2014-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 11,631 -6,158 -34.62 518 -22.22 0.0077
2014-05-05 2014-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 17,789 -5,657 -24.13 666 -20.24 0.0105
2014-02-05 2013-12-31 13F/A-1 ALLEGHENY TECHNOLOGIES COM 01741R102 23,446 0 0.00 835 17.77 0.0129
2014-01-29 2013-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 23,446 835
2014-02-05 2013-09-30 13F/A-1 ALLEGHENY TECHNOLOGIES Com 01741R102 23,446 0 0.00 709 11.83 0.0107
2013-11-06 2013-09-30 13F ALLEGHENY TECHNOLOGIES Com 01741R102 23,446 709
2014-02-12 2013-06-30 13F/A-1 ALLEGHENY TECHNOLOGIES Com 01741R102 23,446 23,446 634 0.0103
2013-08-05 2013-06-30 13F ALLEGHENY TECHNOLOGIES Com 01741R102 23,446 634
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.