ATI Inc.
US ˙ NYSE ˙ US01741R1023

SecurityATI / ATI Inc.
InstitutionIng Groep Nv
Latest Disclosed Ownership377,500 shares
Latest Disclosed Value $ 54,911,150
Ing Groep Nv reports 93.29% increase in ownership of ATI / ATI Inc.

On May 11, 2026 - Ing Groep Nv filed a 13F-HR form disclosing ownership of 377,500 shares of ATI Inc. (US:ATI) valued at $54,911,150 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 11, 2026 disclosing 195,300 shares of ATI Inc.. This represents a change in shares of 93.29% during the quarter. The current value of the position is $67,927,350 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)
2026-05-11 2026-03-31 13F ATI COM 01741R102 377,500 182,200 93.29 54,911 145.01 0.3358
2026-02-11 2025-12-31 13F ATI COM 01741R102 195,300 -98,213 -33.46 22,413 -6.12 0.1352
2025-11-06 2025-09-30 13F ATI COM 01741R102 293,513 101,113 52.55 23,874 43.72 0.1292
2025-08-06 2025-06-30 13F ATI COM 01741R102 192,400 192,400 16,612 0.1011
2025-05-09 2025-03-31 13F ATI COM 01741R102 0 -68,400 -100.00 0 -100.00
2025-02-03 2024-12-31 13F ATI COM 01741R102 68,400 20,400 42.50 3,765 17.22 0.0254
2024-11-06 2024-09-30 13F ATI COM 01741R102 48,000 48,000 3,212 0.0187
2018-05-07 2018-03-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 0 -18,992 -100.00 0 -100.00
2018-02-06 2017-12-31 13F ALLEGHENY TECHNOLOGIES COM 01741R102 18,992 5,657 42.42 458 43.57 0.0076
2017-11-08 2017-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 13,335 97 0.73 319 41.78 0.0061
2017-07-25 2017-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 13,238 13,238 37.03 225 -11.42 0.0043
2013-11-13 2013-09-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 0 -9,661 -100.00 0 -100.00
2013-08-14 2013-06-30 13F ALLEGHENY TECHNOLOGIES COM 01741R102 9,661 9,661 254 0.0013
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.