ATI Inc.
MX ˙ BMV ˙ US01741R1023
SecurityMX:ATI / ATI Inc.
InstitutionMengis Capital Management, Inc.
Latest Disclosed Ownership70,652 shares
Latest Disclosed Value $ 10,277,039
Mengis Capital Management, Inc. reports 3.57% decrease in ownership of ATI / ATI Inc.

On May 12, 2026 - Mengis Capital Management, Inc. filed a 13F-HR form disclosing ownership of 70,652 shares of ATI Inc. (MX:ATI) valued at $10,277,039 USD as of March 31, 2026. The entity filed a previous 13F-HR on March 5, 2026 disclosing 73,267 shares of ATI Inc.. This represents a change in shares of -3.57% 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)
2026-05-12 2026-03-31 13F ATI COM 01741R102 70,652 -2,615 -3.57 10,277 22.23 1.7688
2026-03-05 2025-12-31 13F ATI COM 01741R102 73,267 -8,540 -10.44 8,408 26.36 1.4863
2025-11-12 2025-09-30 13F ATI COM 01741R102 81,807 1,080 1.34 6,654 -4.52 1.3084
2025-07-24 2025-06-30 13F ATI COM 01741R102 80,727 -2,180 -2.63 6,970 61.58 1.4808
2025-05-08 2025-03-31 13F ATI COM 01741R102 82,907 2,575 3.21 4,314 -2.44 0.9006
2025-02-04 2024-12-31 13F ATI COM 01741R102 80,332 1,530 1.94 4,421 -16.14 0.9031
2024-11-05 2024-09-30 13F ATI COM 01741R102 78,802 -1,150 -1.44 5,273 18.93 1.0374
2024-08-13 2024-06-30 13F/A-1 ATI COM 01741R102 79,952 -450 -0.56 4,433 7.75 0.8986
2024-07-17 2024-06-30 13F ATI COM 01741R102 80,402 0 4,114 0.5865
2024-05-14 2024-03-31 13F/A-1 ATI COM 01741R102 80,402 2,650 3.41 4,114 16.38 0.6344
2024-05-07 2024-03-31 13F ATI COM 01741R102 77,752 0 3,535 0.6626
2024-02-01 2023-12-31 13F ATI COM 01741R102 77,752 6,150 8.59 3,535 19.99 0.6626
2023-11-09 2023-09-30 13F ATI COM 01741R102 71,602 748 1.06 2,946 -5.97 0.6124
2023-08-08 2023-06-30 13F ATI COM 01741R102 70,854 900 1.29 3,134 13.51 0.6253
2023-05-05 2023-03-31 13F ATI COM 01741R102 69,954 100 0.14 2,760 137,900.00 0.5816
2023-02-01 2022-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 69,854 500 0.72 2 -99.89 0.4545
2022-11-04 2022-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 69,354 0 0.00 1,845 17.14 0.4371
2022-07-19 2022-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 69,354 -1,000 -1.42 1,575 -16.58 0.3459
2022-05-02 2022-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 70,354 350 0.50 1,888 69.33 0.3619
2022-02-04 2021-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 70,004 -250 -0.36 1,115 -4.54 0.2093
2021-11-03 2021-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 70,254 0 0.00 1,168 -20.22 0.2453
2021-08-16 2021-06-30 13F/A-1 ALLEGHENY TECHNOLOGIES COM 01741R102 70,254 0 0.00 1,464 -1.01 0.3034
2021-07-21 2021-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 70,254 0 1,479 0.3271
2021-05-07 2021-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 70,254 -5,000 -6.64 1,479 17.19 0.3276
2021-02-03 2020-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 75,254 4,800 6.81 1,262 105.54 0.3065
2020-10-29 2020-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 70,454 -1,800 -2.49 614 -16.58 0.1684
2020-07-22 2020-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 72,254 -2,300 -3.09 736 16.27 0.2186
2020-05-06 2020-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 74,554 -21,730 -22.57 633 -68.17 0.2162
2020-02-06 2019-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 96,284 11,850 14.03 1,989 16.38 0.5479
2019-11-05 2019-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 84,434 846 1.01 1,709 -18.85 0.5092
2019-07-18 2019-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 83,588 250 0.30 2,106 -1.13 0.6442
2019-05-06 2019-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 83,338 300 0.36 2,130 17.87 1.1888
2019-02-06 2018-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 83,038 -600 -0.72 1,807 -26.87 1.1460
2018-11-05 2018-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 83,638 4,750 6.02 2,471 24.73 1.3582
2018-07-24 2018-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 78,888 1,550 2.00 1,981 8.19 1.1714
2018-04-27 2018-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 77,338 11,100 16.76 1,831 14.51 1.0954
2018-02-13 2017-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 66,238 1,555 2.40 1,599 3.50 0.9684
2017-11-06 2017-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 64,683 3,500 5.72 1,545 48.56 1.0351
2017-08-01 2017-06-30 13F ALLEGHENY TECHNOLOGIES COM COM 01741R102 61,183 -184 -0.30 1,040 -5.63 0.7366
2017-05-11 2017-03-31 13F ALLEGHENY TECHNOLOGIES COM COM 01741R102 61,367 5,700 10.24 1,102 24.38 0.8069
2017-02-07 2016-12-31 13F ALLEGHENY TECHNOLOGIES COM COM 01741R102 55,667 2,970 5.64 886 -6.93 0.7045
2016-10-31 2016-09-30 13F ALLEGHENY TECHNOLOGIES COM COM 01741R102 52,697 -4,549 -7.95 952 30.59 0.7924
2016-08-08 2016-06-30 13F ALLEGHENY TECHNOLOGIES COM COM 01741R102 57,246 -4,816 -7.76 729 -27.89 0.6427
2016-05-11 2016-03-31 13F/A-1 ALLEGHENY TECHNOLOGIES COM COM 01741R102 62,062 -1,348 -2.13 1,011 41.80 0.9339
2016-05-09 2016-03-31 13F ALLEGHENY TECHNOLOGIES COM COM 01741R102 62,062 1,011
2016-02-01 2015-12-31 13F ALLEGHENY TECHNOLOGIES COM COM 01741R102 63,410 -2,696 -4.08 713 -23.91 0.6219
2015-11-09 2015-09-30 13F ALLEGHENY TECHNOLOGIES COM COM 01741R102 66,106 2,555 4.02 937 -51.17 0.8730
2015-07-29 2015-06-30 13F ALLEGHENY TECHNOLOGIES COM COM 01741R102 63,551 23,303 57.90 1,919 58.99 1.6045
2015-04-28 2015-03-31 13F ALLEGHENY TECHNOLOGIES COM COM 01741R102 40,248 3,603 9.83 1,207 -5.26 1.0537
2015-02-10 2014-12-31 13F ALLEGHENY TECHNOLOGIES COM COM 01741R102 36,645 36,645 1,274 1.2296
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.