ATI Inc.
US ˙ NYSE ˙ US01741R1023

SecurityATI / ATI Inc.
InstitutionStifel Financial Corp
Latest Disclosed Ownership92,619 shares
Latest Disclosed Value $ 13,472,411
Stifel Financial Corp reports 5.13% decrease in ownership of ATI / ATI Inc.

On May 12, 2026 - Stifel Financial Corp filed a 13F-HR form disclosing ownership of 92,619 shares of ATI Inc. (US:ATI) valued at $13,472,360 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 97,630 shares of ATI Inc.. This represents a change in shares of -5.13% during the quarter. The current value of the position is $16,773,301 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)
2026-05-12 2026-03-31 13F ATI COM 01741R102 92,619 -5,011 -5.13 13,472 20.24 0.0124
2026-02-13 2025-12-31 13F ATI COM 01741R102 97,630 8,174 9.14 11,204 53.99 0.0101
2025-11-12 2025-09-30 13F ATI COM 01741R102 89,456 14,689 19.65 7,276 12.72 0.0066
2025-08-14 2025-06-30 13F ATI COM 01741R102 74,767 6,584 9.66 6,455 81.98 0.0063
2025-05-14 2025-03-31 13F ATI COM 01741R102 68,183 44,474 187.58 3,547 172.01 0.0038
2025-02-13 2024-12-31 13F ATI COM 01741R102 23,709 1,075 4.75 1,305 -13.87 0.0014
2024-11-14 2024-09-30 13F ATI COM 01741R102 22,634 -930 -3.95 1,514 15.93 0.0016
2024-08-13 2024-06-30 13F ATI COM 01741R102 23,564 11 0.05 1,307 8.38 0.0015
2024-05-14 2024-03-31 13F ATI COM 01741R102 23,553 5,877 33.25 1,205 50.06 0.0014
2024-02-12 2023-12-31 13F ATI COM 01741R102 17,676 -5,292 -23.04 804 -15.03 0.0010
2023-11-13 2023-09-30 13F ATI COM 01741R102 22,968 -5,759 -20.05 945 -25.59 0.0013
2023-08-14 2023-06-30 13F ATI COM 01741R102 28,727 -2,287 -7.37 1,271 3.84 0.0017
2023-05-12 2023-03-31 13F ATI COM 01741R102 31,014 -15,778 -33.72 1,224 -12.46 0.0018
2023-02-13 2022-12-31 13F ATI COM 01741R102 46,792 3,895 9.08 1,397 22.33 0.0021
2022-11-14 2022-09-30 13F ATI COM 01741R102 42,897 4,886 12.85 1,142 32.33 0.0019
2022-08-15 2022-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 38,011 2,375 6.66 863 -9.73 0.0014
2022-05-13 2022-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 35,636 6,169 20.94 956 103.40 0.0013
2022-02-14 2021-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 29,467 -1,055 -3.46 470 -7.48 0.0006
2021-11-15 2021-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 30,522 2,118 7.46 508 -14.19 0.0007
2021-08-13 2021-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 28,404 -15,596 -35.45 592 -36.07 0.0009
2021-05-14 2021-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 44,000 -6,638 -13.11 926 9.07 0.0015
2021-02-12 2020-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 50,638 -4,362 -7.93 849 76.88 0.0015
2020-11-16 2020-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 55,000 -4,747 -7.95 480 -21.18 0.0010
2020-08-14 2020-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 59,747 -34,707 -36.74 609 -22.72 0.0014
2020-05-14 2020-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 94,454 -509,401 -84.36 788 -93.70 0.0022
2020-02-13 2019-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 603,855 45,685 8.18 12,503 10.34 0.0260
2019-11-19 2019-09-30 13F/A-1 ALLEGHENY TECHNOLOGIES COM 01741R102 558,170 -78,542 -12.34 11,331 -29.80 0.0289
2019-11-13 2019-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 558,170 -78,542 11,331 6,351.5934
2019-08-14 2019-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 636,712 -27,392 -4.12 16,141 -5.39 0.0416
2019-05-14 2019-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 664,104 109,276 19.70 17,060 40.77 0.0482
2019-02-13 2018-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 554,828 420,182 312.06 12,119 203.51 0.0392
2018-11-13 2018-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 134,646 -22,413 -14.27 3,993 -0.05 0.0114
2018-08-14 2018-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 157,059 -5,190 -3.20 3,995 4.25 0.0123
2018-05-11 2018-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 162,249 -47,538 -22.66 3,832 -23.88 0.0121
2018-02-14 2017-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 209,787 -62,963 -23.08 5,034 -22.78 0.0160
2017-11-13 2017-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 272,750 -44,733 -14.09 6,519 20.45 0.0226
2017-08-14 2017-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 317,483 20,647 6.96 5,412 0.91 0.0201
2017-05-10 2017-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 296,836 36,559 14.05 5,363 28.52 0.0208
2017-02-16 2016-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 260,277 -3,001 -1.14 4,173 -12.74 0.0177
2016-11-15 2016-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 263,278 -13,885 -5.01 4,782 35.31 0.0215
2016-08-17 2016-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 277,163 -57,885 -17.28 3,534 -35.29 0.0163
2016-05-16 2016-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 335,048 -19,859 -5.60 5,461 36.76 0.0291
2016-03-21 2015-12-31 13F/A-2 ALLEGHENY TECHNOLOGIES COM 01741R102 354,907 36,891 11.60 3,993 -11.44 0.0208
2016-02-26 2015-12-31 13F/A-1 ALLEGHENY TECHNOLOGIES COM 01741R102 353,993 -914 3,983 0.0208
2016-02-16 2015-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 354,140 3,984
2015-11-16 2015-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 318,016 118,383 59.30 4,509 -25.21 0.0253
2015-08-17 2015-06-30 13F/A-1 ALLEGHENY TECHNOLOGIES COM 01741R102 199,633 15,510 8.42 6,029 9.10 0.0312
2015-08-17 2015-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 199,595 6,028
2015-05-14 2015-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 184,123 -35,292 -16.08 5,526 -27.57 0.0302
2015-02-13 2014-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 219,415 14,568 7.11 7,629 0.38 0.0424
2014-11-13 2014-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 204,847 -23,387 -10.25 7,600 -26.16 0.0667
2014-08-14 2014-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 228,234 -653,446 -74.11 10,293 -69.02 0.0924
2014-05-15 2014-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 881,680 881,680 33,222 0.3179
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.