ATI Inc.
US ˙ NYSE ˙ US01741R1023

SecurityATI / ATI Inc.
InstitutionNatixis Advisors, L.p.
Latest Disclosed Ownership124,277 shares
Latest Disclosed Value $ 18,077
Natixis Advisors, L.p. reports 17.84% decrease in ownership of ATI / ATI Inc.

On May 13, 2026 - Natixis Advisors, L.p. filed a 13F-HR form disclosing ownership of 124,277 shares of ATI Inc. (US:ATI) valued at $18,077,332 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 151,265 shares of ATI Inc.. This represents a change in shares of -17.84% during the quarter. The current value of the position is $22,362,403 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)
2026-05-13 2026-03-31 13F ATI COM 01741R102 124,277 -26,988 -17.84 18 5.88 0.0251
2026-02-10 2025-12-31 13F ATI COM 01741R102 151,265 75,342 99.23 17 183.33 0.0246
2025-11-13 2025-09-30 13F ATI COM 01741R102 75,923 274 0.36 6 0.00 0.0090
2025-08-13 2025-06-30 13F ATI COM 01741R102 75,649 11,311 17.58 7 100.00 0.0104
2025-05-08 2025-03-31 13F ATI COM 01741R102 64,338 -13,229 -17.05 3 -25.00 0.0062
2025-02-10 2024-12-31 13F ATI COM 01741R102 77,567 -190 -0.24 4 -20.00 0.0080
2024-11-06 2024-09-30 13F ATI COM 01741R102 77,757 12,875 19.84 5 66.67 0.0101
2024-08-01 2024-06-30 13F ATI COM 01741R102 64,882 2,776 4.47 4 0.00 0.0078
2024-04-25 2024-03-31 13F ATI COM 01741R102 62,106 23,596 61.27 3 200.00 0.0073
2024-02-06 2023-12-31 13F ATI COM 01741R102 38,510 -8,137 -17.44 2 0.00 0.0046
2023-11-13 2023-09-30 13F ATI COM 01741R102 46,647 1,600 3.55 2 0.00 0.0059
2023-08-15 2023-06-30 13F ATI COM 01741R102 45,047 2,539 5.97 2 0.00 0.0062
2023-05-11 2023-03-31 13F ATI COM 01741R102 42,508 2,984 7.55 2 0.00 0.0058
2023-01-27 2022-12-31 13F ATI COM 01741R102 39,524 -538 -1.34 1 -99.91 0.0045
2022-11-14 2022-09-30 13F ATI COM 01741R102 40,062 11,378 39.67 1,066 63.75 0.0045
2022-08-12 2022-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 28,684 7,457 35.13 651 14.21 0.0029
2022-05-12 2022-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 21,227 21,227 570 0.0022
2020-04-27 2020-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 0 -26,762 -100.00 0 -100.00
2020-02-10 2019-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 26,762 1,246 4.88 553 6.96 0.0039
2019-11-12 2019-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 25,516 1,031 4.21 517 -16.21 0.0041
2019-08-12 2019-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 24,485 -1,084 -4.24 617 -5.66 0.0050
2019-05-15 2019-03-31 13F/A-1 ALLEGHENY TECHNOLOGIES COM 01741R102 25,569 -1,627 -5.98 654 10.47 0.0057
2019-05-15 2019-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 25,569 -1,627 654
2019-02-13 2018-12-31 13F/A-1 ALLEGHENY TECHNOLOGIES COM 01741R102 27,196 -57 -0.21 592 -26.46 0.0058
2019-02-13 2018-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 27,196 -57 592
2018-11-13 2018-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 27,253 554 2.07 805 19.97 0.0071
2018-08-14 2018-06-30 13F/A-1 ALLEGHENY TECHNOLOGIES COM 01741R102 26,699 5,920 28.49 671 36.38 0.0064
2018-08-14 2018-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 26,699 671
2018-05-10 2018-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 20,779 -596 -2.79 492 -4.65 0.0049
2018-02-14 2017-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 21,375 5,065 31.05 516 32.65 0.0053
2017-11-14 2017-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 16,310 -2,781 -14.57 389 19.69 0.0041
2017-07-27 2017-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 19,091 5,897 44.69 325 37.13 0.0035
2017-05-12 2017-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 13,194 -138 -1.04 237 11.79 0.0026
2017-02-07 2016-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 13,332 -80 -0.60 212 -12.40 0.0025
2016-11-04 2016-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 13,412 13,412 0.00 242 0.0031
2016-08-01 2016-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 0 -12,509 -100.00 0 -100.00
2016-05-06 2016-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 12,509 -8,341 -40.00 204 -13.19 0.0031
2016-02-12 2015-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 20,850 -1,342 -6.05 235 -25.40 0.0039
2015-11-12 2015-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 22,192 3,137 16.46 315 -45.31 0.0055
2015-08-14 2015-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 19,055 -3,941 -17.14 576 -16.52 0.0098
2015-05-15 2015-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 22,996 -7,260 -24.00 690 -34.41 0.0121
2015-02-05 2014-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 30,256 -1,339 -4.24 1,052 -10.24 0.0197
2014-11-03 2014-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 31,595 1,576 5.25 1,172 -13.38 0.0235
2014-08-13 2014-06-30 13F ALLEGHENY COM 01741R102 30,019 1,252 4.35 1,353 24.82 0.0194
2014-05-13 2014-03-31 13F ALLEGHENY COM 01741R102 28,767 12,559 77.49 1,084 87.87 0.0167
2014-02-12 2013-12-31 13F ALLEGHENY COM 01741R102 16,208 2,945 22.20 577 42.47 0.0094
2013-10-30 2013-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 13,263 3,309 33.24 405 55.17 0.0075
2013-07-19 2013-06-30 13F ALLEGHENY COM 01741R102 9,954 9,954 261 0.0052
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.