ATI Inc.
MX ˙ BMV ˙ US01741R1023
SecurityMX:ATI / ATI Inc.
InstitutionQuadrant Capital Group Llc
Latest Disclosed Ownership16,122 shares
Latest Disclosed Value $ 2,345,107
Quadrant Capital Group Llc reports 2.21% increase in ownership of ATI / ATI Inc.

On May 13, 2026 - Quadrant Capital Group Llc filed a 13F-HR/A form disclosing ownership of 16,122 shares of ATI Inc. (MX:ATI) valued at $2,345,107 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 15,773 shares of ATI Inc.. This represents a change in shares of 2.21% 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)
2026-05-13 2026-03-31 13F/A-1 ATI COM 01741R102 16,122 349 2.21 2,345 29.56 0.0701
2026-05-11 2026-03-31 13F ATI COM 01741R102 16,122 349 49 0.0369
2026-02-12 2025-12-31 13F ATI COM 01741R102 15,773 289 1.87 1,810 43.76 0.0547
2025-11-13 2025-09-30 13F ATI COM 01741R102 15,484 -527 -3.29 1,259 -8.90 0.0409
2025-08-13 2025-06-30 13F ATI COM 01741R102 16,011 -847 -5.02 1,382 57.58 0.0498
2025-05-13 2025-03-31 13F ATI COM 01741R102 16,858 10,528 166.32 877 152.01 0.0326
2025-02-13 2024-12-31 13F ATI COM 01741R102 6,330 -346 -5.18 348 -21.97 0.0240
2024-11-12 2024-09-30 13F ATI COM 01741R102 6,676 625 10.33 447 33.13 0.0310
2024-08-12 2024-06-30 13F ATI COM 01741R102 6,051 448 8.00 336 17.13 0.0249
2024-05-15 2024-03-31 13F ATI COM 01741R102 5,603 410 7.90 287 21.19 0.0226
2024-02-08 2023-12-31 13F ATI COM 01741R102 5,193 -234 -4.31 236 5.83 0.0203
2023-11-14 2023-09-30 13F ATI COM 01741R102 5,427 721 15.32 223 7.21 0.0224
2023-08-10 2023-06-30 13F ATI COM 01741R102 4,706 672 16.66 208 30.82 0.0207
2023-05-11 2023-03-31 13F ATI COM 01741R102 4,034 116 2.96 159 37.07 0.0166
2023-02-13 2022-12-31 13F ATI COM 01741R102 3,918 -498 -11.28 117 -1.69 0.0133
2022-11-10 2022-09-30 13F ATI COM 01741R102 4,416 4,053 1,116.53 118 1,375.00 0.0156
2022-08-09 2022-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 363 1 0.28 8 -20.00 0.0011
2022-05-06 2022-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 362 109 43.08 10 150.00 0.0012
2022-02-01 2021-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 253 35 16.06 4 0.00 0.0005
2021-11-12 2021-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 218 0 0.00 4 -20.00 0.0006
2021-08-09 2021-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 218 0 0.00 5 0.00 0.0007
2021-05-12 2021-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 218 0 0.00 5 25.00 0.0008
2021-02-16 2020-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 218 61 38.85 4 300.00 0.0007
2020-11-13 2020-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 157 0 0.00 1 -50.00 0.0002
2020-08-13 2020-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 157 -996 -86.38 2 -80.00 0.0004
2020-05-15 2020-03-31 13F Allegheny Technologies Com 01741R102 1,153 885 330.22 10 100.00 0.0017
2020-03-19 2019-12-31 13F/A-1 Allegheny Technologies Com 01741R102 268 0 0.00 5 0.00 0.0006
2020-02-03 2019-12-31 13F Allegheny Technologies Com 01741R102 268 0 5 16.8957
2019-10-24 2019-09-30 13F Allegheny Technologies COM 01741R102 268 0 0.00 5 -16.67 0.0008
2019-07-24 2019-06-30 13F Allegheny Technologies COM 01741R102 268 -997 -78.81 6 -80.65 0.0009
2019-04-29 2019-03-31 13F Allegheny Technologies COM 01741R102 1,265 935 283.33 31 416.67 0.0054
2019-01-17 2018-12-31 13F Allegheny Technologies COM 01741R102 330 62 23.13 6 -14.29 0.0016
2018-10-29 2018-09-30 13F Allegheny Technologies COM 01741R102 268 0 0.00 7 16.67 0.0020
2018-08-08 2018-06-30 13F Allegheny Technologies COM 01741R102 268 0 0.00 6 0.00 0.0021
2018-05-10 2018-03-31 13F Allegheny Technologies COM 01741R102 268 0 0.00 6 0.00 0.0022
2018-01-31 2017-12-31 13F Allegheny Tech Inc COM 01741R102 268 0 0.00 6 0.00 0.0024
2017-10-13 2017-09-30 13F Allegheny Tech Inc COM 01741R102 268 0 0.00 6 0.0025
2017-08-14 2017-06-30 13F Allegheny Tech Inc COM 01741R102 268 0 0.00 0 -100.00
2017-04-10 2017-03-31 13F Allegheny Tech Inc COM 01741R102 268 0 0.00 4 0.00 0.0018
2017-01-11 2016-12-31 13F Allegheny Tech Inc COM 01741R102 268 0 0.00 4 0.00 0.0020
2016-10-25 2016-09-30 13F Allegheny Tech Inc COM 01741R102 268 0 0.00 4 33.33 0.0026
2016-07-28 2016-06-30 13F Allegheny Tech Inc COM 01741R102 268 0 0.00 3 -25.00 0.0021
2016-04-27 2016-03-31 13F Allegheny Tech Inc COM 01741R102 268 164 157.69 4 300.00 0.0026
2016-01-28 2015-12-31 13F Allegheny Tech Inc COM 01741R102 104 74 246.67 1 0.0007
2015-10-28 2015-09-30 13F Allegheny Tech Inc COM 01741R102 30 30 0 0.0000
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.